JPH02269840A - Yarn tension-applying device in fiber machine - Google Patents

Abstract

PURPOSE:To apply stable tension to drawn yarn by providing a yarn bobbin- supporting part material, a fixing part material supporting middle rotating body in rotatable state, a return spring giving returning force against rotating force of the middle rotating body, a rotation-suppressing means and a releasing means. CONSTITUTION:Drawing force is affected to yarn 14, then a bobbin-supporting part material 15 and a middle rotating body 18 are rotated in a state of constraining relative rotations of the both by a rotation-suppressing means 30, thus yarn 14 of a length drawn during rotation of said middle rotating body 18 against force of a return spring 22 is introduced through a yarn guide 20. A lever 33 touches on a protrusion 37 for a rotating amount of the above- mentioned middle rotating body 18 larger than a fixed value and a blake band 31 is loosen to release constraint of a bobbin 13, then yarn 14 is further drawn out and although simultaneously enforcing force by the above-mentioned return spring 22 is applied to rotation of the middle rotating body 18 according to the drawing out of yarn 14, the middle rotating body 18 is rotated by successive drawing force applied to the yarn 14, thus introducing of the yarn 14 is continued.

Description

[Detailed Description of the Invention] [Industrial Field of Application J] The present invention is used in a textile machine when pulling out yarn wound around a bobbin, in which the set tension is maintained stably and the yarn is supplied; This invention relates to a thread tension applying device that allows the tension to be set and changed arbitrarily.

[Prior Art] Conventionally, a mechanism as shown in FIG. 7 has been known as a device for supplying selvage yarn.

The thread tension applying device shown in the figure applies a preset tension to the thread 2 when pulling out the thread wound around the bobbin L. Although the bobbin L is rotatable, By engaging the claw 4 with the wheel 3, rotation is restrained and supported, and the thread 2 unwound from the bobbin 1 of No. 7 is wound around the swing lever 5 and guided out. The swinging lever 5 is under tension due to the fixed position am at the tip. I! ! ? +] When the enabled tension spring 6 is applied and the swing lever 5 is rotated by a certain amount against the biasing force of the tension spring 6, the pawl is pressed against the ratchet wheel 3. An engaging element 7 is provided to release the engagement.

Therefore, when pulling out the thread 2 that has been drawn out from the bobbin 1,
When the swinging lever 5 rotates a certain amount against the tension spring 6 due to the force acting on the thread, the engaging element 7 presses the pawl reef and the engagement with the ratchet wheel 3 is released. the result,
The bobbin 1 rotates by one tooth of the ratchet wheel 3, and as a result, the thread tension slightly decreases, so the swinging lever 5 returns due to the biasing force of the tension spring 6, and the pawl 4 engages with the ratchet wheel 3 again. .

This mechanism that winds the thread 2 around the swinging lever 5 on which the tension spring e acts and pulls it out rapidly changes the drawing direction while applying force to the thread, so it applies a large frictional force to the thread. This will result in a squeezing condition and the possibility of damage to the thread is very high.

On the other hand, a device in which tension is applied to the thread without using a swing lever on which a tension spring acts is also known, such as in Japanese Patent Laid-Open No. 83-811357.

However, in these devices, it is extremely difficult to arbitrarily set the thread tension due to their mechanism, and even if this could be achieved, it would be difficult to stably keep the tension constant.

[Problem to be solved by the invention] The technical problem of the present invention is to solve the above-mentioned problems,
To obtain a thread tension applying device which prevents damage to the thread by reducing the frictional force applied to the thread when applying a constant tension to the thread, and which can easily and stably perform all the thread tensions. There is a particular thing.

[Means for Solving the Problems] The yarn tension applying device of the present invention for solving the above problems includes:
Basically, there is a bobbin support member that supports the bobbin with thread wound thereon, a fixed thread guide that guides the unwound thread from the bobbin, and an intermediate rotating member that is coaxial with the bobbin support member. a fixing member that rotatably supports the bobbin support member and the intermediate rotating body; and a fixing member that rotatably supports the bobbin support member and the intermediate rotating body; A return spring that applies a return force against the rotational force applied to the support member, and a return spring that is provided between the other of the two members and the intermediate rotating body to restrain relative rotation therebetween. and a rotation suppressing means provided on the member of the bobbin support member and the fixing member to which the return spring is attached, and is provided on a member of the bobbin support member and the fixing member to which the return spring is attached, and provides a constant amount of rotation between the member and the intermediate rotating body against the biasing force of the return spring. and a release means for releasing the restriction of rotation by the rotation suppressing means when g4! ! enable or
The present invention is constructed by providing an adjusting means that can adjust the position at which the restriction on rotation by the rotation suppressing means is released by changing the installation position of the releasing means.

[Function] When a pull-out force is applied to the thread, the thread applies rotational force to the bobbin support member, causing it to rotate against the force of the return spring, but until the rotation reaches a certain level. Since the free rotation of the bobbin is restrained by the rotation suppressing means, only the length of yarn that is let out as the return spring is expanded is drawn out.

When a rotational force is further applied to the bobbin support member and the rotation exceeds a certain value, the release means releases the restriction by the rotation suppressing means, and the thread is drawn out by the rotation of the bobbin. At the same time as the thread is drawn out, the rotational force applied by the thread to the bobbin support member decreases, so that the release means becomes inoperable due to the biasing force of the return spring. As a result, the rotation of the bobbin support member is restricted again, but if the thread is subsequently drawn out,
The restriction is released by the rotation of the bobbin support member due to the tension of the thread again, and the thread is led out.

In order to adjust the tension of the thread, the return force of the return spring, etc. may be adjusted using the adjustment means.

[Example 1] Figures 1 and 2 show a first embodiment of a thread tension applying device according to the present invention.

This thread tension applying device is capable of stably maintaining a set tension when pulling out a thread wound around a bobbin in a textile machine, and can also set or change the tension as desired.

To explain the structure in detail, the fixing member 11 usually constitutes a part of a bobbin carrier or is attached to a bobbin carrier. It rotatably supports the wound bobbin 13 and bobbin support member 15, and also a fixing member! An intermediate rotating body 18 coaxial with the bobbin support member 15 is rotatably supported on the bobbin support member 15. The bobbin 13 and the bobbin support member 15 are joined via the retaining unevenness IB, and only the bobbin can be freely attached and detached, but the two may be integrated.

The thread guide 20 erected on the fixed member 11 guides the thread 14 unwound from the bobbin 13.
When a pulling force is applied to the thread 14, a rotational force is applied to the bobbin 13 and the bobbin support member 15 based on the tension applied to the thread 14.

Moreover, between the intermediate rotating body 18 and the fixed member 11,
A return spring 22 is attached to apply a return force against the rotational force applied to the intermediate rotating body due to the tension generated when the thread 14 is drawn out. An adjusting means 23 for adjusting the return force of the return spring 22 is configured to connect one end of the return spring 22 to the fixing member 11.
The position of the spring holder 24 for attachment to the intermediate rotating body 18 can be adjusted by inserting the screw 2B into the elongated hole 25, and by changing the support point of the return spring 22, the return force acting on the intermediate rotating body 18 can be adjusted. It is something.

On the other hand, the bobbin support member 15 and the intermediate rotating body! A rotation suppressing means 3 is provided between the thread 14 and the thread 14 to restrain relative rotation therebetween when a pulling force of a certain level or more is not applied to the thread 14.
0 is set.

This rotation suppressing means 30 is constructed by winding a brake band 31 with one end fixed to the intermediate rotating body 18 around a brake wheel 32 provided on the bobbin support member 15 and connecting it to a lever 33 on the intermediate rotating body 18. A spring 3 is attached to the lever 33 in a direction that always tightens the brake band 31 to the brake wheel 32.
The rotation of both is restrained by applying a force of 4 and tightening this brake. Further, the rotation suppressing means 3
As a release hand a38 for releasing the restriction of rotation by 0, there is a release hand a38 on the fixed member 11 that comes into contact with one end of the lever 33 when the intermediate rotating body rotates by a certain amount per day due to the pulling force acting on the thread 14. In the thread tension applying device having such a structure, when a pulling force is applied to the thread t4 in the state shown in FIG. 2, the bobbin 13 and the bobbin support member 15 are A rotational force can be applied to the intermediate rotating body 18 through the return spring 2.
It will rotate against the force of 2. Since the relative rotation between the bobbin support member 15 and the intermediate rotating body 18 is restrained by the one-rotation suppressing means 30 until the rotation reaches a certain level, the intermediate rotating body 18 rotates against the force of the return spring 22. Only the length of thread that is unwound during this time is drawn out.

When the rotational force is further applied to the intermediate rotating body 18 and the amount of rotation exceeds a certain level, the lever 33 on the intermediate rotating body 18 comes into contact with the protrusion 37, the brake band 31 is loosened, and the restraint of the bobbin 13 is released. Ru. Therefore, due to the rotation of the bobbin 13, the thread! 4 is derived, but at the same time as the derivation, the thread 14
Since the rotational force applied to the intermediate rotating body 18 is reduced, the intermediate rotating body 18 is given a tendency to return due to the biasing force of the return spring 22. As a result, the rotation of the intermediate rotary body 18 is restrained by the brake, but if the thread 14 is subsequently drawn out, the restraint of the bobbin 13 is released by the rotation of the intermediate rotary body 18 again due to the tension of the thread. and the thread is drawn out.

thread! When the pulling out of the thread 14 stops, the intermediate rotating body 18 is rotated back to some extent by the return spring 22, and the thread is pulled back accordingly, so that the slack in the thread 14 is removed, and even when the next thread is drawn out, the thread is almost constant. can give a thread tension of

In order to adjust the tension of the thread 14, the mounting position of the spring holder 24 can be adjusted by loosening the screw 2B.

In the second embodiment shown in FIG. 3, as the rotation suppressing means 30,
The tip of a pawl 42 rotatably mounted on the intermediate rotating body 1B is biased by a spring 43 to engage a pawl wheel 41 provided on the bobbin, and the rotation by the rotation suppressing means 30 is prevented. The fixing member l! serves as a release means 38 for releasing the restraint. A structure is adopted in which the wind 42 is disengaged from the ratchet wheel 41 by the engagement of the wind 42 with the protrusion 4B, whose position can be adjusted by inserting a screw 45 into the elongated shaft 44.

Therefore, from the state shown in the figure, the thread! When a rotational force of a certain value or more is applied to the intermediate rotating body 18 due to the tension of 4, the return spring 22
When the intermediate rotary body 18 rotates against the biasing force of the intermediate rotary body 18 and the protrusion 4B releases the engagement between the pawl 42 and the ratchet wheel 41, the thread is drawn out from the bobbin, and accordingly, the intermediate rotary body 18 rotates against the urging force of the intermediate rotary body 18. 8 is given a tendency to return, the pawl 42 engages with the ratchet wheel 41 again,
The thread is drawn out while repeating this process.

In the third embodiment of the present invention shown in FIGS. 4 and 5, the bobbin 13 and the previously described bobbin support member 15 are integrated, and the bobbin support member 15 and the intermediate rotating body 18 are connected to a rotation suppressing means 30. are connected via. In addition, the return spring 51
The other end of the return spring 51 attached to the intermediate rotating body 18 is attached to the worm wheel 52 as an adjusting means 23 for adjusting the return force of the return spring 51, and the return spring 51 is supported by the rotation of the worm 53 that meshes with the worm wheel 52. It is configured to change the point.

Furthermore, in this embodiment, when the intermediate rotating body 18 rotating against the force of the return spring 51 reaches a required detection position, a sensor 56 detects the presence of the detection port $57 and outputs an electric signal. It is equipped with The detection target 57 or the sensor 5B can be mounted at a variable position to make the detection position adjustable, which also makes it possible to adjust the thread tension.W! It constitutes means 55.

The rotation restraining means 30 for restraining the rotation of the bobbin is configured to restrain the rotation of the bobbin 13 by the engagement of the pawl 81 with the ratchet wheel 80, as in the previous embodiment. In order to release the restriction on the rotation of the bobbin, an electric drive means (solenoid) 63 is provided which is driven based on the output of the sensor 58. In addition, in the figure, 64 indicates a battery.

Therefore, when a preset position is detected by the sensor 58, the thread/id is activated, the restriction on rotation of the bobbin is released, and the thread is drawn out.

In the above embodiment, the return spring 22.51 and the like are installed between the fixed member 11 and the intermediate rotating body 1B, and the rotation suppressing means 30 is provided between the bobbin support member 15 and the intermediate rotating body 18. However, as schematically shown in FIG. 6, a return spring 22 is installed between the bobbin support member 15 and the intermediate rotating body 18, and a rotation suppressing means is installed between the fixed member 11 and the intermediate rotating body 18. 30 can also be provided.

[Effects of the Invention] According to the present invention described in detail above, when the thread is pulled out while applying a constant tension to the thread wound around the bobbin, the frictional force applied to the thread can be reduced to prevent damage to the thread. It is possible to obtain a thread tension applying device which allows the thread tension to be easily adjusted and provides stable thread tension with a simple and compact structure.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a first embodiment of a thread tension applying device according to the present invention, FIG. 2 is a schematic sectional view for explaining its operation, and FIG. A schematic sectional view for explaining the operation of the embodiment, FIGS. 4 and 5 are a side view and a schematic sectional view of the third embodiment of the present invention, and FIG. 6 is an explanatory diagram of another embodiment. FIG. 7 is a perspective view of a conventional tension applying device. l, 13Φt bobbin, 2.14... Thread, 3.41.
60--Claw wheel, 4,42,81 Threat/Claw, 5.33...
Lever, 11--Fixing member. 15. Bobbin support member, 18. Life center rotation body, 20. Thread guide, 22.51
--Return spring, 23. 11 means, 30. Rotation suppressing means, 31. Brake band, 32. Brake wheel, 38
・Release means, 37.48 ・Protrusion, 58・φ position sensor. B3... Electric drive means.

Claims (1)

[Scope of Claims] 1. A bobbin support member that supports a bobbin on which thread is wound, a fixed thread guide that guides the unwound thread from the bobbin, and a thread guide provided coaxially with the bobbin support member. a fixed member rotatably supporting the bobbin supporting member and the intermediate rotating body; a fixed member installed between one of the bobbin supporting member and the fixed member and the intermediate rotating body; A return spring that applies a return force against the rotational force applied to the bobbin support member by force, and a return spring that is provided between the other of the two members and the intermediate rotating body, and A rotation suppressing means for constraining rotation, and a rotation suppressing means provided on the member of the bobbin support member and the fixing member to which the return spring is attached, and a rotation suppressing means that is provided between the member and the intermediate rotating body against the biasing force of the return spring. a release means for releasing the restriction of rotation by the rotation suppressing means when the amount of rotation is given; and an adjustment means for adjusting the return force by changing the support point of the return spring. A yarn tensioning device for a textile machine, characterized by: 2. A bobbin support member that supports a bobbin with thread wound thereon, a fixed thread guide that guides the unwound thread from the bobbin, and an intermediate rotating body provided coaxially with the bobbin support member; A fixed member rotatably supports the bobbin support member and the intermediate rotary body, and is attached between one of the bobbin support member and the fixed member and the intermediate rotary body, and is attached to the bobbin support member by the thread pulling force. a return spring that applies a return force against the applied rotational force; and a rotation suppressor that is provided between the other of the two members and the intermediate rotating body and that restricts relative rotation therebetween. and a means provided on the member of the bobbin support member and the fixing member to which the return spring is attached, and a constant amount of rotation is applied between the member and the intermediate rotating body against the biasing force of the return spring. a release means for releasing the rotation restraint by the rotation restraint means when the rotation restraint is applied, and an adjustment means capable of adjusting the position at which the rotation restraint by the rotation restraint is released by changing the installation position of the release means. A yarn tensioning device for a textile machine, characterized in that: 3. As a rotation suppressing means, a brake band is provided on the intermediate rotating body to tighten one of the brake wheels of the bobbin support member and the fixed member, and as a releasing means, a lever provided at one end of the brake band is pressed. Claim 1 characterized in that a protrusion for loosening the brake is provided.
A yarn tensioning device for a textile machine according to item 1 or 2. 4. As a rotation suppressing means, a pawl is provided on the intermediate rotating body to engage with the ratchet wheel of one of the bobbin support member and the fixing member, and as a releasing means, the pawl is pressed to engage with the ratchet wheel. A thread tension applying device for a textile machine according to claim 1 or 2, characterized in that a protrusion is provided for releasing the tension. 5. As a rotation suppressing means, a pawl is provided on the intermediate rotary body and engages with a ratchet wheel of one of the bobbin support member and the fixing member, and is driven by an electric driving means, and as a releasing means,
3. A yarn tension applying device for a textile machine according to claim 1 or 2, characterized in that a position sensor is used that outputs an electric signal for disengaging the pawl by the electric drive means.