JPH0649744A - Device for providing yarn with tension in fiber machine - Google Patents

Abstract

PURPOSE:To effectively suppress occurrence of excessive rotation of plural pitches revolution of bobbin all at once with enlargement of absorption length of yarn by a tension spring and reduction in tension spring constant in order to further improve tension characteristics in a device for supplying tension. CONSTITUTION:Yarn 13 is wound on a small-sized bobbin 12 supported by a cylindrical main body 11 having a small diameter and a locking member 14 which is geared with an engaging pawl 12a around the bobbin and locks the bobbin is slidably inserted into the main body 11 by forcing the rocking member by a return spring 15. A tension spring 17 for applying tensile force to the yarn is laid between the main body 11 and a connecting element 16 outside the main body 11. A handling member 19 for releasing lock of the bobbin by the locking member against force applied by the return spring 15 acts on the locking member geared with the engaging pawl 12a of the bobbin when the tension spring 17 is displaced up to fixed length, the meshing is released to rotate the bobbin by one pitch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensioning device for a textile machine for weaving a three-dimensional woven fabric or the like, which is capable of supplying a yarn for weaving while stably maintaining a set tensile force. Is.

[0002]

2. Description of the Related Art A tension applying device previously proposed as Japanese Patent Application No. 3-92916 has a structure as shown in FIG. In this tension applying device, a thread 3 is wound around a small bobbin 2 supported by a body 1 having a small diameter tubular shape, and the bobbin 2
Engaging claws 2a are provided at appropriate intervals around the
A lock member 4 for locking the bobbin 2 by engaging with the main body 1
It is slidably fitted inside and is biased toward the bobbin 2 by a return spring 5. Further, in the main body 1, a tension spring 7 for applying a necessary tensile force to the yarn 3 is provided, and a connecting rod 6 for connecting the main body 1 to a weaving device or the like via the tension spring 7 is attached. , The connecting rod 6 is slidably mounted on the main body 1, and the connecting rod 6 is attached to the main body 1 by the tension spring 7.
It is urged to pull in.

Further, since the lock member 4 unlocks the bobbin 2 when the tension force applied to the yarn 3 by the tension spring 7 reaches a certain value, the bobbin 2 slides against the urging force of the tension spring 7. An engaging collar 8 is provided at the inner end of the connecting rod 6 for
When the engagement brim 8 engages with the engagement edge 9 of the lock member 4 and moves it slightly, the engagement of the lock member 4 with the engagement claw 2a of the bobbin 2 is released. .

In the above tension applying device, when a tensile force acts on the yarn 3 during weaving, the tension spring 7 is compressed in accordance with the tensile force, and the connecting rod 6 is pulled out from the main body 1 accordingly. When the tension force acting on the yarn 3 is further increased and the tension spring 7 is compressed to a certain length, the engagement flange 8 at the inner end of the connecting rod 6 engages with the engagement edge 9 of the lock member 4. Since the lock member 4 is slid against the biasing force of the return spring 5, the tip of the lock member 4 disengages the engagement claw 2a of the bobbin 2. As a result, the bobbin 2 is rotated by the tensile force of the yarn 3 and the yarn 3 is sent out,
At the same time, the tension spring 7 expands due to the decrease in the tensile force, the tip of the lock member 4 engages with the engaging claw 2a of the bobbin 2, and the delivery of the yarn 3 is stopped.

By repeating this operation, the yarn 3
Are delivered with a substantially constant tensile force. Therefore, within the range of the length corresponding to this one pitch, the tensile force of the yarn 3 slightly fluctuates as the tension spring 7 and the return spring 5 expand and contract, but the fluctuation of the tensile force is always kept within that range. To be done. When the yarn 3 is loosened, the looseness is absorbed within the range of expansion and contraction of the tension spring 7.

In the above tension applying device, in order to further improve the tension characteristic, the difference between the lock release start tension and the lock tension by the lock member 4 is reduced, and the fluctuation of the tension due to the looseness of the yarn 3 is reduced. Therefore, it is important to increase the absorption length of the tension spring 7 and reduce the tension spring constant. However, if the tension spring 7 is provided with a large absorption length in order to satisfy such a requirement, the tension spring 7 is enlarged and the main body 1 for housing the tension spring 7 is accommodated.
Due to the increase in mass due to the size increase of itself, on the contrary, bobbin 2
There is a high possibility that excessive rotation will occur, in which the yarn will rotate multiple pitches all at once, and the excessive rotation will cause the yarn supply length to increase sharply and the tension to drop significantly temporarily, which may further deteriorate the tension characteristics. There is.

That is, the occurrence of excessive rotation of the bobbin takes a time until the main body 1, the bobbin 2 and the like are pulled back to their original positions by the return spring 5 after the lock member 4 is disengaged from the engaging claw 2a of the bobbin 2. It is related to t and the rotation amount φ of the bobbin 2 that rotates during the time t, and when the time t is small, excessive rotation is unlikely to occur. Then, the time t is the main body 1
Since the moving portion such as the bobbin 2 and the bobbin 2 depends on the acceleration when returning to the lock member 4 side, the mass increases when the mass of the moving portion increases, and the time t increases when the tension spring constant decreases. Therefore, the structure of FIG. 1 has a problem that excessive rotation is likely to occur by increasing the absorption length of the tension spring 7.

[0008]

DISCLOSURE OF THE INVENTION The technical problem of the present invention is that, in the above tension applying device, a thread for use in weaving a three-dimensional woven fabric or the like is supplied from a small bobbin supported on a thin-diameter tubular main body. In this case, in order to further improve the tension characteristics, the absorption length of the yarn by the tension spring is increased and the tension spring constant is decreased, but with this, excessive rotation occurs in which the bobbin rotates a plurality of pitches at once. To effectively suppress the

[0009]

A tension applying device of the present invention for solving the above problems winds a thread around a small bobbin supported by a thin-diameter tubular body and engages around the bobbin. A lock member that locks the bobbin by engaging the claw is urged toward the bobbin by a return spring and slidably inserted into the main body, and the main body and the weaving device are connected to the main body outside the main body. A tension spring for exerting a necessary tensile force on the yarn is provided between the tension spring and the connector for engaging with the engaging claw of the bobbin when the tension spring is displaced to a certain length. An operating member is provided which acts on the lock member holding the bobbin in a locked state and releases the lock of the bobbin by the lock member against the biasing force of the return spring.

In the above-described yarn tension applying device, a tension spring is stretched between the main body and the operation member case to which the connector is attached, and the lock member is engaged with the engaging claw of the bobbin. An operation member is provided between the operation member case and the operation member case to release the engagement of the lock member with the bobbin when the tension springs extend to a certain length and the engagement portions at both ends engage with the tension spring. A tension spring whose one end is fixed to the other end of the case is provided in the case for the tension spring in which the connector is attached, and between the inner end of the tension spring and the lock member that engages with the engaging claw of the bobbin. It is possible to provide an operation member for releasing the engagement of the lock member with the bobbin by engaging the engaging portions at both ends with each other when the tension spring is compressed to a certain length. Further, a flexible operation member having a string shape may be used as the operation member.

[0011]

When a tensile force acts on the yarn during weaving, the tension spring is displaced according to the tensile force, and when the tensile force reaches a certain value, the engaging claws around the bobbin are engaged. The bobbin is unlocked by the locking member. As a result, the yarn is sent out by the tensile force of the yarn, and at the same time the tensile force decreases, so that the lock member again engages with the engaging claw of the bobbin by the urging force of the return spring, and the yarn delivery is stopped. To be done. Then, by repeating this operation, the yarn is sent out while maintaining a substantially constant tension.

In this case, it is necessary to reduce the time until the moving parts such as the main body and the bobbin are returned to their original positions by the return spring after the lock member is disengaged from the engaging claws of the bobbin. It is effective for suppressing the occurrence. Therefore, in the above tension applying device, a tension spring for exerting a necessary tensile force on the yarn is provided outside the main body, thereby giving the tension spring a large absorption length and reducing the tension spring constant. The increase in the mass of the moving part due to the enlargement of the tension spring and the main body is eliminated, and the increase is reduced. Therefore, it is possible to increase the acceleration of the moving portion returning to the lock member side, reduce the possibility of excessive rotation of the bobbin rotating a plurality of pitches at once, and improve the tension characteristic.

[0013]

FIG. 2 shows a first embodiment of the tension applying device according to the present invention. This tension applying device is used to stably maintain a set tensile force when sending out a yarn composed of a yarn or other fiber bundle in a three-dimensional woven fabric weaving device, etc. Because of the arrangement, it is formed as slender as possible.

The structure will be described in detail. The main body 11 having a small-diameter cylindrical shape has a small bobbin 12 supported therein, and the bobbin 12 is provided with a yarn 13 (which is connected to the yarn). Including a wire material for feeding with strong strength such as Tegusu). In addition, the tubular body 11 has
In order to lock the bobbin 12 around which the thread 13 is wound, a lock member 14 that locks the bobbin 12 by engaging with engaging claws 12a provided at appropriate intervals around the bobbin 12 is slidably inserted. Is urged toward the bobbin 12 by the return spring 15.

The main body 11 is connected to a carrier or the like in a weaving device for giving a weaving operation to a yarn. A connector 16 for connecting to the weaving device or the like is separately provided, and this connector 16 Is rotatably attached to the operating member case 18, and a tension spring 17 for applying a tensile force required for the yarn 13 is stretched between the main body 11 and the operating member case 18 outside the main body 11. is doing.

Further, when the tensile force acting on the yarn 13 reaches a certain value and the tension spring 17 is extended and displaced to a certain length, the lock member 14 releases the yarn 13 from being pulled out, and the bobbin is released. In order to allow the yarn to be pulled out from the thread 12, the lock member 14 and the operation member case 18 have
The respective end portions of the operating member 19 are respectively inserted, and the engaging portions 20 and 21 at both ends thereof are respectively engaged with the engaging edges 22 and 23 inside the lock member 14 and the operating member case 18 when the tension spring 17 is extended. The lock member 14 is configured to be locked and resist the urging force of the return spring 15 to release the engagement of the bobbin 12 with the engagement claw 12a.

In the tension applying device of the first embodiment having the above-mentioned structure, when a tensile force acts on the yarn 13 in accordance with the weaving operation, the tension spring 17 expands in accordance with the tensile force,
When the tensile force increases and the tension spring 17 extends to a certain length, the locking portions 20 and 21 at both ends of the operating member 19 engage the locking member 14 and the engaging edges 22 and 23 of the operating member case 18. Further, since the operating member 19 slides the lock member 14 against the urging force of the return spring 15 by their engagement, the tip of the lock member 14 is moved toward the bobbin 1.
The engagement of the second engaging claw 12a is released. as a result,
The bobbin 12 is rotated by one pitch by the tensile force of the yarn 13, and the yarn 13 is sent out by a length corresponding to the one pitch. At the same time, the tension spring 17 is contracted by the decrease in the tensile force, and the lock member 14 is locked. The tip end engages with the engaging claw 12a of the bobbin 12 by the urging force of the return spring 15, and the delivery of the yarn 13 is stopped.

Therefore, by repeating this operation, the yarn is sent out while maintaining a substantially constant tension. This tension slightly fluctuates with the expansion and contraction of the tension spring 17 and the return spring 15 within the range of the length corresponding to one pitch of the engaging claws 12a of the bobbin 12, but the fluctuation of the tensile force is always within the range. It is possible to draw out the yarn while being applied to the yarn 13 while being applied with a substantially constant tension. When the yarn 13 is loosened, the looseness is absorbed within the expansion / contraction range of the tension spring 17.

In this case, after the lock member 14 is disengaged from the engaging claw 12a of the bobbin 12, the main body 11 and the bobbin 12 are separated.
It is effective to suppress the occurrence of the excessive rotation in which the bobbin 12 rotates a plurality of pitches at a time by reducing the time until the moving portion such as the above is returned to the original position by the return spring 15. However, in the above tension applying device, the tension spring 17 for exerting the necessary tensile force on the yarn 13 is provided outside the main body 11, whereby the tension spring 17 has a large absorption length and the tension spring constant. However, the increase in the mass of the moving part due to the enlargement of the tension spring 17 and the main body 11 is eliminated, and the amount is decreased. Therefore, it is possible to increase the acceleration at which the moving portion returns, reduce the possibility of excessive rotation of the bobbin 12 that rotates a plurality of pitches at once, and improve the tension characteristic.

FIG. 3 shows a second tension applying device according to the present invention.
An example is shown. This tension applying device is shown in FIG.
The main body 11, the bobbin 12, the thread 13, the lock member 14, the return spring 15, the connector 16 and the like similar to the embodiment are provided, but they are different in the following points.

That is, the tension spring 27 for exerting a necessary tensile force on the yarn 13 is housed in a tension spring case 28 separate from the main body 11 having the connector 16 attached to one end thereof, and the case is One end of the tension spring 27 is fixed to the end of the connector 28 opposite to the side where the connector 16 is attached, and the tension spring 27 is fixed to the lock member 14 that engages with the engaging claw 12a of the bobbin 12. The respective end portions of the operating member 29 are inserted, and the engaging portions 30 and 31 at both ends thereof are engaged with the engaging edge 32 of the lock member 14 and the inner end of the tension spring 27, respectively.

Therefore, when the tension spring 17 is compressed, the operating member 29 is subjected to the urging force of the return spring 15 while the locking portions 30 and 31 at both ends thereof are locked to the lock member 14 and the tension spring 27, respectively. In contrast, the lock member 14 has the bobbin 1
The engagement with the second engagement claw 12a is released. Note that, since the other configurations and operations are substantially the same as those in the case of the first embodiment, their description will be omitted.

FIG. 4 shows a third embodiment of the present invention. In this tension applying device, a string-like flexible operating member 39 is used instead of the rod-and-rod-like operating member 19 in the first embodiment. There is. Therefore, unlike the case of the first embodiment, it is not necessary to provide the long operating member case 18, and the tension spring 17 can be provided substantially between the main body 11 and the connector 16, and only that. The tension applying device can be downsized and shortened. Since the other configurations and operations are substantially the same as those in the first embodiment, the same reference numerals as those in the first embodiment are attached to the main parts and the description thereof will be omitted.

[0024]

According to the tension applying device of the present invention described in detail above, it is possible to apply a stable and substantially constant tension to a yarn used for weaving a three-dimensional fabric. At the same time as reducing the difference in the release start tension, it is possible to suppress excessive rotation in which the bobbin rotates a plurality of pitches at once, and to reduce the decrease in tension even when excessive rotation occurs.

[Brief description of drawings]

FIG. 1 is a sectional view of a proposed tension applying device.

FIG. 2 is a sectional view of the first embodiment of the tension applying device according to the present invention.

FIG. 3 is a sectional view of a second embodiment of the tension applying device according to the present invention.

FIG. 4 is a sectional view of a third embodiment of the tension applying device according to the present invention.

[Explanation of symbols]

 11 main body, 12 bobbin, 12a engaging claw, 13 thread, 14 locking member, 15 return spring, 16 connector, 17,27 tension spring, 18 operation member case, 19,29 operation member, 28 tension spring case , 39 Flexible operation member.

Claims (4)

[Claims] 1. A lock member for winding a thread around a small bobbin supported by a body having a small diameter tubular shape, and engaging a claw around the bobbin to lock the bobbin, a bobbin side by a return spring. It is slidably inserted into the main body by being urged against the main body, and a tensile force necessary for the yarn is applied outside the main body between the main body and a connector for connecting the main body to a weaving device or the like. A tension spring is provided for causing the lock spring to engage with the engaging claw of the bobbin to hold the bobbin in the locked state when the tension spring is displaced to a certain length, A yarn tension applying device in a textile machine, comprising an operation member for releasing a lock of a bobbin by a lock member against an urging force. 2. The lock member according to claim 1, wherein the tension spring is stretched between the main body and the operation member case to which the connector is attached, and the lock member engages with the engaging claw of the bobbin. An operating member is provided between the operating member case and the operating member case to release the engagement of the lock member with the bobbin when the tension springs extend to a certain length and the engaging portions of the both ends engage with each other. A yarn tension applying device for a textile machine. 3. The tension spring case according to claim 1, wherein a tension spring having one end fixed to the other end of the case is provided in the tension spring case having a connector attached to one end thereof. When the tension spring is compressed to a certain length with the lock member that engages with the engagement claw of the bobbin, the engagement portions at both ends engage with the tension spring to release the engagement of the lock member with the bobbin. A yarn tension applying device in a textile machine, comprising an operating member. 4. The yarn tension applying device in a textile machine according to claim 1, wherein a flexible operating member having a string shape is used as the operating member.