JPH0447054B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a textile machine in which, when pulling out yarn wound around a bobbin, the yarn is supplied while maintaining a set tension stably. 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 set tension to the thread 2 when pulling out the thread wound around the bobbin 1. Although the bobbin 1 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 is wound around the swing lever 5 and guided out. A tension spring 6 whose tension can be adjusted by adjusting the fixing position of the tip acts on the swing lever 5.
An engaging element 7 is provided which presses the claw 4 to release the engagement with the ratchet wheel 3 when the swing lever 5 rotates by a certain amount against the urging force of the bobbin 1. When the thread 2 is pulled out, the swinging lever 5 rotates a certain amount against the tension spring 6 due to the force acting on the thread, and the engager 7 presses the pawl 4, causing the ratchet wheel to rotate. 3 is released. As a 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 to its original position due to the biasing force of the tension spring 6, and the pawl 4 engages the ratchet wheel 3 again. engage.

This mechanism that winds the thread 2 around the swinging lever 5 on which the tension spring 6 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. 63-66357.

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.

[Problems to be Solved by the Invention] The technical problem of the present invention is to solve the above-mentioned problems and reduce the frictional force applied to the thread when applying a constant tension to the thread to prevent damage to the thread. It is an object of the present invention to provide a thread tension applying device which prevents the above problems and allows the thread tension to be adjusted easily and stably.

[Means for Solving the Problems] The thread tensioning device of the present invention for solving the above problems basically includes a bobbin support member that supports a bobbin on which thread is wound, and a fixed thread guide for guiding the thread out; an intermediate rotating body provided coaxially with the bobbin supporting member; a fixed member rotatably supporting the bobbin supporting member and the intermediate rotating body; a bobbin supporting member; a return spring that is attached between one of the fixed members and the intermediate rotating body and applies a return force against the rotational force applied to the bobbin support member by the thread pulling force; and both of the above-mentioned members. a rotation suppressing means provided between the other member of the bobbin support member and the intermediate rotary member to restrain relative rotation therebetween; and a member of the bobbin support member and the fixing member to which the return spring is attached. and a release means for releasing the restriction on rotation by the rotation suppressing means when a certain amount of rotation is applied between the member and the intermediate rotating body against the biasing force of the return spring. Further, an adjusting means is provided, in which the return force of the return spring can be adjusted by changing the support point of the return spring, or the position at which rotation restraint by the rotation suppressing means is released can be adjusted by changing the installation position of the releasing means. It is constituted by providing.

[Function] When a pull-out force is applied to the thread, the thread applies a 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. Up to this point, free rotation of the bobbin is restricted by the rotation suppressing means, so that only the length of yarn that is paid out as the return spring is expanded is drawn out.

When a rotational force is further applied to the bobbin support member, thereby causing rotation above a certain value, the release means releases the restriction by the rotation suppressing means, and the thread is guided out by the rotation of the bobbin. However, at the same time as the thread is released, the rotational force applied to the bobbin support member by the thread 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 restrained again, but if the thread is subsequently drawn out, the restraint is released by the rotation of the bobbin support member again due to the tension of the thread, and the thread is drawn 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.

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

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

To explain the configuration specifically, the fixing member 11
usually constitutes a part of the bobbin carrier or is attached to the bobbin carrier, etc., and the thread 1 is
4 wound bobbin 13 and bobbin support member 1
5 is rotatably supported, and an intermediate rotating body 18 coaxial with the bobbin support member 15 is rotatably supported on the fixed member 11 between the bobbin support member 15 and the bobbin support member 15. The bobbin 13 and the bobbin support member 15 have engaging projections and depressions 1.
6, and only the bobbin can be freely attached and detached, but the two may be integrated.

Thread guide 20 erected on the fixing member 11
is for guiding the thread 14 unwound from the bobbin 13, and when a pulling force is applied to the thread 14, the bobbin 1 is guided based on the tension acting on the thread 14.
3 and the bobbin support member 15 are given rotational force.

Further, a return spring 22 is installed between the intermediate rotating body 18 and the fixed member 11 to apply a return force against the rotational force applied to the intermediate rotating body due to the tension caused by the pulling out of the thread 14. . The adjustment means 23 for adjusting the return force of the return spring 22 is
A spring holder 24 for attaching one end of the return spring 22 to the fixing member 11 is inserted into the elongated hole 25 with a screw 26.
The position can be adjusted by screw insertion, and by changing the support point of the return spring 22, the return force acting on the intermediate rotating body 18 can be adjusted.

On the other hand, the bobbin support member 15 and the intermediate rotating body 1
A rotation suppressing means 30 is provided between the yarn 14 and the yarn 14 to restrict relative rotation therebetween when a pulling force of a certain level or more is not applied to the yarn 14.

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 the brake band 31 to a lever 33 on the intermediate rotating body 18. The force of the spring 34 is always applied to the lever 33 in the direction of tightening the brake band 31 to the brake wheel 32, and the rotation of both is restrained by tightening the brake. Further, the rotation suppressing means 3
As a release means 36 for releasing the rotational restraint caused by the thread 14, a release means 36 is provided on the fixing member 11 to contact one end of the lever 33 when the intermediate rotating body 18 is rotated by a certain amount due to the pulling force acting on the thread 14. A protrusion 37 is provided that comes into contact with the brake and loosens the brake.

In the thread tension applying device having such a configuration, when a pull-out force is applied to the thread 14 in the state shown in FIG. They will rotate against the force of the return spring 22. Until the rotation reaches a certain level, the relative rotation between the bobbin support member 15 and the intermediate rotating body 18 is restrained by the rotation suppressing means 30, so that 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, the thread 14 is drawn out by the rotation of the bobbin 13, but at the same time as the thread 14 is drawn out, the rotational force applied to the intermediate rotating body 18 by the thread 14 decreases, so that a return spring is applied to the intermediate rotating body 18. A return tendency is given by the urging force of 22. As a result, the rotation of the intermediate rotating body 18 is restrained by the brake, but if the thread 14 is subsequently drawn out,
By the rotation of the intermediate rotating body 18 again due to the tension of the thread, the restraint of the bobbin 13 is released and the thread is drawn out.

When the drawing 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.
Removes the slack in the thread, and also when pulling out the next thread,
Almost constant thread tension can be applied.

To adjust the tension of the thread 14, use the spring holder 2
4 can be adjusted by loosening the screw 26.

In the second embodiment shown in FIG. 3, the rotation suppressing means 30
The tip of a pawl 42 rotatably mounted on the intermediate rotating body 18 is biased by a spring 43 to engage a pawl wheel 41 provided on the bobbin,
Further, as a release means 36 for releasing the restriction on rotation by the rotation suppressing means 30, the claw 42 engages with a protrusion 46 which is attached to the fixing member 11 so that its position can be adjusted by inserting a screw 45 into an elongated hole 44. Accordingly, a configuration is adopted in which the claw 42 can be removed from the ratchet wheel 41.

Therefore, when a rotational force of a certain value or more is applied to the intermediate rotating body 18 due to the tension of the thread 14 from the illustrated state, the intermediate rotating body 1 resists the biasing force of the return spring 22.
8 rotates and the protrusion 46 releases the engagement between the pawl 42 and the ratchet wheel 41, the thread 14 is led out from the bobbin, and accordingly, the intermediate rotating body 18 is given a tendency to return, so that the pawl 42 is disengaged from the pawl 42 again. is engaged with the ratchet wheel 41,
The thread is drawn out while repeating this process.

In the third embodiment of the present invention shown in FIGS. 4 and 5, a bobbin 13 and the bobbin support member 1 described above are used.
5 are integrated, and the bobbin support member 15 and intermediate rotating body 18 are coupled via a rotation suppressing means 30. Further, as an adjusting means 23 for adjusting the return force of the return spring 51, the other end of the return spring 51 attached to the intermediate rotating body 18 is connected to the worm wheel 5.
The support point of the return spring 51 is changed by the rotation of a worm 53 that meshes with the worm wheel 52.

Furthermore, in this embodiment, when the intermediate rotary body 18 rotating against the force of the return spring 51 reaches a required detection position, a sensor 56 is installed which detects the presence of the detection target 57 and outputs an electric signal. We are prepared. The detection target 57 or the sensor 56 constitutes an adjusting means 55 that makes it possible to adjust the detection position by making the mounting position of either of them variable, and thereby also makes it possible to adjust the thread tension. .

The rotation suppressing means 30 for restraining the rotation of the bobbin is configured to restrain the rotation of the bobbin 13 by engaging the pawl 61 with the ratchet wheel 60, as in the previous embodiment. In order to release the restriction on the rotation of the bobbin, the sensor 5
It is provided with an electric drive means (solenoid) 63 that is driven based on the output of 6. In addition, in the figure,
64 indicates a battery.

Therefore, when a preset position is detected by the sensor 56, the solenoid is activated, the rotation of the bobbin is released, and the thread is drawn out.

In addition, in the above embodiment, the fixing member 11
The return springs 22, 51, etc. are installed between the bobbin support member 15 and the intermediate rotating body 1.
As shown schematically 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 30 may also be provided between the intermediate rotating body 18 and the intermediate rotating body 18 .

[Effects of the Invention] According to the present invention described in detail above, when pulling out a thread wound around a bobbin while applying a constant tension,
To obtain a thread tension applying device which reduces the frictional force applied to the thread to prevent its damage, and which has a simple and compact structure to easily adjust the tension of the thread and obtain stable thread tension. Can be done.

[Brief explanation of the drawing]

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. 1,13...Bobbin, 2,14...Thread, 3,41,
60... Ratchet wheel, 4, 42, 61... Pawl, 5, 33... Lever, 11... Fixing member, 15... Bobbin support member,
18... Intermediate rotating body, 20... Yarn guide, 22, 51
... return spring, 23 ... adjustment means, 30 ... rotation suppressing means, 31 ... brake band, 32 ... brake wheel,
36...Release means, 37, 46...Protrusion, 56...Position sensor, 63...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 bobbin support member that is provided coaxially with the bobbin support member. an intermediate rotary body, a fixed member rotatably supporting the bobbin support member and the intermediate rotary body, and a fixed member installed between one of the bobbin support member and the fixed member and the intermediate rotary body, a return spring that applies a return force against the rotational force applied to the bobbin support member by a rotation restraining means which restrains the rotation but is released from the restraint by the operation of a lever; and a rotation restraining means which is provided on the member of the bobbin support member and the fixing member to which the return spring is attached, and which resists the biasing force of the return spring. a release means for releasing the restriction of rotation by the rotation suppressing means by engagement of a protrusion with the lever when a certain amount of rotation is applied between the member and the intermediate rotating body; A yarn tension applying device for a textile machine, comprising: an adjustment means that can adjust the return force by changing the support point of the yarn tensioning device. 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, an intermediate rotating body provided coaxially with the bobbin support member, and the above-mentioned A fixed member rotatably supports the bobbin support member and the intermediate rotary body, and the bobbin support member is attached between one of the bobbin support member and the fixed member and the intermediate rotary body, and the bobbin support member is attached by the thread pulling force. A return spring is provided between the other of the two members and the intermediate rotating body to restrain relative rotation therebetween. A rotation suppressing means whose restraint is released by the operation of a claw, and a rotation suppressing means provided on a member of the bobbin support member and fixing member to which a return spring is attached, resisting the biasing force of the return spring to prevent intermediate rotation between the member and the fixing member. a release means for releasing the restriction of rotation by the rotation suppressing means by engagement of a protrusion with the pawl when a certain amount of rotation is applied between the release means and the protrusion; and a position where the protrusion is installed in the release means. 1. A yarn tension applying device for a textile machine, comprising: an adjusting means that can adjust the position at which rotation restraint by the rotation suppressing means is released by changing. 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, it engages with a lever provided at one end of the brake band, Claim 1 characterized in that a protrusion is provided that presses the protrusion to loosen the brake.
A yarn tensioning device for a textile machine as described in 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 engaged with the pawl and presses it to release the pawl. A yarn tensioning device for a textile machine according to claim 1 or 2, characterized in that a protrusion is provided for releasing engagement with a wheel. 5. A bobbin support member that supports the bobbin on which the thread is wound, a fixed thread guide that guides the unwound thread from the bobbin, an intermediate rotating body provided coaxially with the bobbin support member, and the above-mentioned A fixed member rotatably supports the bobbin support member and the intermediate rotary body, and the bobbin support member is attached between one of the bobbin support member and the fixed member and the intermediate rotary body, and the bobbin support member is attached by the thread pulling force. a return spring that applies a return force against the rotational force applied to the intermediate rotating body; a rotation suppressing means provided with a driven pawl;
a release means having a position sensor for outputting an electric signal for releasing the engagement of the pawl by the electric drive means; and an adjustment means capable of adjusting the return force by changing the support point of the return spring. A yarn tensioning device for a textile machine, characterized by comprising: 6. A bobbin support member that supports a bobbin with thread wound thereon, a fixed thread guide that guides the unwound thread from the bobbin, an intermediate rotating body provided coaxially with the bobbin support member, and the above-mentioned A fixed member rotatably supports the bobbin support member and the intermediate rotary body, and the bobbin support member is attached between one of the bobbin support member and the fixed member and the intermediate rotary body, and the bobbin support member is attached by the thread pulling force. a return spring that applies a return force against the rotational force applied to the intermediate rotating body; a rotation suppressing means provided with a driven pawl;
A release means consisting of a position sensor for outputting an electric signal to release the engagement of the pawl by the electric drive means, and a position at which rotation restraint by the rotation suppressing means is adjusted by changing the installation position of the release means. A thread tension applying device for a textile machine, characterized in that it is equipped with an adjustment means that makes it possible.