JP2846543B2 - Braking device and tension adjusting device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire for applying tension to a wire in the course of being guided to a winding machine or the like, and controlling the wire so that it does not break when an abnormal tension occurs. The present invention relates to a tension adjusting device for a material and an optimal braking device used for such a tension adjusting device.

2. Description of the Related Art Generally, when a filament material such as a yarn, a twisted yarn, a coil or an optical fiber is wound by a winding machine, a constant tension is applied to the filament material by a tension adjusting device. .

An example of this type of tension adjusting device is disclosed in Japanese Patent Application Laid-Open No. 2-193871. The tension adjusting device includes a permanent magnet type hysteresis brake as a braking device. Hereinafter, these braking devices and a tension adjusting device using the braking devices will be briefly described.

A magnetic shield plate is supported on a fixed housing as a main body of the apparatus via a bearing. Permanently different magnetic poles N and S are alternately magnetized in a circumferential direction inside a cylindrical portion of the magnetic shield plate. A magnetic wheel to which a magnet is fixed is supported via a bearing. A braking shaft is supported in the center hole of the magnetic wheel via a bearing, and at one end of the braking shaft,
A disk-shaped magnetic member that faces the permanent magnet via a magnetic shielding plate is journaled, and a tension pulley is journaled at the other end. The magnetic shield plate, the permanent magnet, the magnetic member, and the like constitute a braking device, and the permanent magnet and the magnetic wheel constitute a member to be rotated.

A shaft, which is coaxial with the brake shaft, is provided with a crank, a sliding plate which is engaged with the crank, and a dial which is in contact with the sliding plate via a wave washer. A friction ring and a spring are interposed between the moving plate and the magnetic shielding plate. The magnetic shield plate is fixed to the fixed housing by a setting knob. One end of the arm fixed to the magnetic wheel is fixed to the tension arm, and the other end of the arm is fixed to the crank. Further, a shaft is fixed to the crank, and a spring is stretched over a stop bolt on this shaft and a bolt screwed into the fixed housing.

[0005] The tension adjusting device having such a structure is as follows.
After the filament material is brought into contact with the tension pulley by approximately 360 degrees through the snare guide and the wire presser, it is brought into contact with the auxiliary tension pulley pivotally attached to the tip of the tension arm by approximately 90 degrees, and is wound by a winder. If abnormal tension occurs in the filament material during winding, the tension arm is rotated against the spring force of the spring stretched between the crank side and the fixed housing, and at the same time, the rotating arm composed of a permanent magnet and a magnetic wheel. Since the moving member is also rotated, the amount of magnetic flux diverted to the magnetic member opposed to the permanent magnet via the magnetic shielding plate is reduced, and the braking torque of the braking device is reduced. Therefore, disconnection of the filament material can be prevented. Further, since a friction mechanism having a friction ring is formed on the crank side fixed to the other end of the arm, the occurrence of cogging caused by the initial setting for reducing the braking torque of the braking device can be avoided.

[0006]

By the way, a conventional braking device and a tension adjusting device using the device are provided with a rotating member comprising a permanent magnet and a magnetic wheel or a rotating member comprising a magnetic shielding plate by rotating a tension arm. By rotating the moving member, a small change in tension during winding is absorbed by changing the braking torque of the braking device (generally referred to as a feedback mechanism). This device is expected to be responsive. However, when the initial setting is performed to reduce the braking torque of the braking device having the permanent magnet, a cogging phenomenon occurs. Therefore, it is necessary to configure a friction mechanism to prevent the cogging.

In the prevention of cogging due to such a friction torque, the friction torque decreases due to wear, so that it is necessary to make an adjustment over time. The present invention has been made in view of such circumstances, and provides a braking device including a braking torque adjusting mechanism that prevents cogging without performing temporal adjustment, and a tension adjusting device using the braking device. Things.

[0008]

SUMMARY OF THE INVENTION A braking device according to the present invention comprises a magnetic member whose magnetic poles are induced by a magnetic field of a permanent magnet in which magnetic poles different in the circumferential direction are alternately magnetized, and an induction magnetic pole of the magnetic member. Rotating member, and the magnetic member and
It is characterized by comprising a braking torque adjusting mechanism that rotates the rotatable member and can be freely engaged with and disengaged from the magnetic member, and a fixing unit that restricts the rotation of the rotatable member.

Further, the tension adjusting device according to the present invention is provided with a magnetic member whose magnetic poles are induced by a magnetic field of a permanent magnet in which magnetic poles different in the circumferential direction are alternately magnetized, and which are rotatable integrally with the magnetic member. A tension pulley provided, a rotatable member for changing an induction magnetic pole of the magnetic member, a braking torque adjusting mechanism for rotating the magnetic member and the rotatable member, and capable of engaging and disengaging the magnetic member. And fixing means for restricting the rotation of the rotated member.

[0010]

The magnetic member induced by the magnetic field of the permanent magnet has a magnetic flux density distribution composed of dense portions and coarse portions alternately in the circumferential direction. When the member to be rotated is rotated, the polarity of the induction magnetic pole of the magnetic member is changed, and a magnetic flux density distribution is newly formed by the magnetic field of the permanent magnet. Also, magnetic members
When the rotating member is rotated, the magnetic pole is induced by the strong magnetic field of the permanent magnet, and the magnetic pole is continuously induced while gradually weakening the magnetic field of the permanent magnet .
Since the residual magnetism of the magnetic member also gradually decreases and becomes small, cogging can be prevented.

[0011]

FIG. 1 is a front view of a tension adjusting device according to an embodiment of the present invention, FIG. 2 is a rear view of the device, and FIG.
FIG. 4 is an explanatory view showing a state in which the engagement of the braking torque adjusting mechanism of FIG. 3 is disengaged and separated, and FIG.
FIG. 5 is a sectional view taken along line BB of FIG. Hereinafter, embodiments of the present invention will be described in detail with reference to these drawings.

The tension adjusting device 1 is supported by a support shaft 2 of a winder (not shown), and a braking device 4 is fixed to a fixed housing 3. As shown in FIGS. 3, 4, and 5, the braking device 4 includes circumferentially different magnetic poles N ·
An annular permanent magnet 5 in which S is alternately four-pole magnetized is fixed to a magnetic wheel 6. The magnetic wheel 6 is formed of an annular member having a substantially L-shaped cross section. The disk portion to which the permanent magnet 5 is fixed is rotatably fitted to the cylindrical member 7 made of a non-magnetic material, and is prevented from coming off by a snap ring. The permanent magnet 5 and the magnetic wheel 6 are configured as members to be rotated. Further, the magnetic wheel 6 and the cylindrical member 7 are fitted and fixed to the cover 8 which is press-fitted into a hole formed in the fixed housing 3.
It is supported by the fixed housing 3.

A brake shaft 9 is rotatably supported in the center hole of the magnetic wheel 6 via a bearing. A tension pulley 10 is mounted on one end of the brake shaft 9 and is mounted on the other end. A gear 11 is mounted on the shaft. A disk-shaped magnetic member 12 made of a hysteresis material is fixed to the tension pulley 10, and a disk-shaped magnetic member opposed to these members is provided between the magnetic member 12 and the permanent magnet 5 with an individual gap. The shielding plate 13 is interposed.

As shown in FIG. 5, the magnetic shield plate 13 has a gap between the permanent magnet 5 and the magnetic shield plate 13 and a gap between the magnetic member 12 and the magnetic shield plate 13 at positions equally divided into four parts in the circumferential direction. A slit 13a having a larger groove width is formed. And the slit 13a is N of the permanent magnet 5.
When located at the boundary between the pole and the S pole, the magnetic field of the permanent magnet 5 is bypassed from the N pole through the magnetic shield plate 13 to the magnetic member 12, and a magnetic circuit flowing through the magnetic shield plate 13 to the S pole is formed. Is done. Since the magnetic member 12 in such a magnetic field has a magnetic flux density distribution formed of alternately dense and coarse portions in the circumferential direction and the magnetic poles are induced, the braking device 4 is set to the maximum braking torque. It will be.

On the other hand, when the magnetic wheel 6 to which the permanent magnet 5 is fixed is rotated, for example, by 45 degrees, the magnetic field of the permanent magnet 5 becomes
A short-circuited magnetic circuit flows from the N pole through the magnetic shield plate 13 to the S pole, and the amount of magnetic flux diverted to the magnetic member 12 is small. In this case, the braking device 4 is set to the minimum braking torque.

The tension adjusting device 1 using such a braking device 4 is provided with a braking torque adjusting mechanism 14.
The braking torque adjusting mechanism 14 has an adjusting shaft 17 rotatably inserted at one end into a through hole of a bottom plate 15 fixed to the fixed housing 3 and supported by a support frame 16 fixed to the bottom plate 15.

A gear 18 is integrally formed on one end side of the adjustment shaft 17.
And a movable member 21 to which a gear 20 engaged with and separated from the gear 11 mounted on the braking shaft 9 is fixed. The movable member 21
Is mounted on the support frame 16 via a bearing 22 so as to be movable only on the adjustment shaft 17 in the axial direction. The movable member 21 is connected to the spring receiver 1.
4 is moved by the spring force of the return spring 23 interposed between the gear 11 and the gear 20.
Are disengaged and separated. Also, the separated gear 2
0 is pressed by the friction plate 24 fixed to the support frame 16 by the spring force of the return spring 23. The gear 20, the return spring 23, and the friction plate 24 constitute fixing means for restricting the rotation of the member to be rotated composed of the permanent magnet 5 and the magnetic wheel 6.

The gear 18 formed on the adjusting shaft 17 meshes with a gear 26 fixed to a hub 25 press-fitted into the cylindrical portion of the magnetic wheel 6, and a screw 27 fixed to the gear 26. , Are inserted into an arc-shaped long hole 28 formed in the fixed housing 3. Further, a scale is engraved on the front side of the fixed housing 3 along a portion where the elongated hole 28 is formed. Note that reference numeral 29 is
The adjustment knob is fitted and fixed to the movable member 21.

The permanent magnet 5 and the magnetic member 12 of the braking device 4 by braking torque adjustment mechanism 14 having such a structure is
By the rotation, the polarity of the induction magnetic pole of the magnetic member 12 is changed, and the braking torque for urging the tension pulley 10 on the braking shaft 9 to which the linear material 30 is attached fluctuates.

On the other hand, the wire member 30 passes through a snail guide 31 fixed to the front side of the fixed housing 3 and a wire holder 32 such as a felt, and approximately 36 to the tension pulley 10.
After being attached by 0 degrees, it is attached by approximately 90 degrees to an auxiliary tension pulley 34 pivotally attached to the tip of the tension arm 33,
It is wound by a winder.

The tension arm 33 is mounted on the fixed housing 3.
And an external tension arm 33a to which an auxiliary tension pulley 34 is pivotally mounted, and a position-adjustable weight 36 which is screwed in the same manner as a screw-adjustable locking member 35. And the inner tension arm 33b mounted thereon.

The tension arm 33 is provided with a locking member 35 and a pin 37 implanted below the fixed housing 3.
1 and the weight of the weight body 36 attached to the inner tension arm 33b, is urged in the clockwise direction in FIG. Reference numeral 39 denotes a stopper rubber that restricts rotation of the tension arm 33, and reference numeral 40 denotes a microswitch that is activated by the rotation of the tension arm 33.

The tension adjusting device 1 having the above structure.
The braking torque of the braking device 4 and the spring force of the spring 38 are set such that the outer tension arm 33a of the tension arm 33 is in a substantially horizontal state when the filament material 30 is wound by the winder. I have. When an abnormal tension or slack acts on the filament 30, the tension arm 33 is rotated against the spring force of the spring 38 or by the spring force of the spring 38 to absorb the fluctuation in the tension.

Adjustment of the braking torque of the braking device 4, particularly in the case where the braking torque is set to a small value, is performed by pushing the setting knob 29 against the spring force of the return spring 23, so that the gears 20 and 11 are pressed. This is performed by rotating the setting knob 29 to rotate the permanent magnet 5 and the magnetic member 12 in the engaged state.

That is, the magnetic member 12 whose magnetic pole is induced by the magnetic field of the permanent magnet 5 has a magnetic flux density distribution composed of dense portions and coarse portions alternately in the circumferential direction.
When the permanent magnet 5 as a member to be rotated is rotated, the magnetic member 1 is rotated.
In 2, the polarity of the induction magnetic pole is changed, and a magnetic flux density distribution is newly formed by the magnetic field of the permanent magnet 5.

Further, since the magnetic member 12 is rotated together with the rotation of the permanent magnet 5, the magnetic field of the permanent magnet 5 is gradually weakened by the magnetic member 12 whose magnetic pole has been induced by the strong magnetic field of the permanent magnet 5. in particular it induces a continuous magnetic pole while
As a result, the remanence of the magnetic member 12 also gradually decreases and becomes small, so that cogging can be prevented.

In the above embodiment, the member to be rotated is the permanent magnet 5 and the magnetic wheel 6, but the permanent magnet 5 and the magnetic wheel 6 are prevented from rotating and the magnetic shielding plate 13 is rotatable. By configuring, the magnetic shielding plate 13
Can be a rotated member. Further, in the embodiment, the braking device 4 including the magnetic shielding plate 13 is exemplified,
A braking device or the like in which a magnetic member is formed between a pair of permanent magnets in which different magnetic poles are alternately magnetized in the circumferential direction may be used. In such a braking device, any one of the permanent magnets may be configured as the member to be rotated.

On the other hand, an example has been shown in which the pair of gears 11 and 20 are engaged and separated as the braking torque adjusting mechanism 14. However, the design of the transmission elements such as these gears can be changed to other transmission elements. The structure of the details is not particularly limited. Further, as the fixing means, a structure based on the friction torque of the gear 20 pressed by the spring force of the return spring 23 and the friction plate 24 is adopted. For example, the friction plate 24 is made of magnet rubber or the like, and the gear 20 is attached to the support frame 16. The structure may be magnetically attracted and may be changed to many structures by design. In the embodiment, the tension adjusting device without the feedback mechanism and the cogging prevention of the optimal braking device using such a tension adjusting device have been described.
The present invention allows the design to be changed to the same device having a feedback mechanism.

[0029]

As described above in detail, the braking device according to the present invention comprises a magnetic member whose magnetic poles are induced by the magnetic field of a permanent magnet in which magnetic poles different in the circumferential direction are alternately magnetized,
And the rotating member to change the induced magnetic poles of the magnetic member, the magnetic
The structure includes a braking torque adjusting mechanism that rotates the movable member and the member to be rotated and that can freely engage and disengage from the magnetic member, and a fixing unit that regulates the rotation of the member to be rotated. This eliminates the need for the adjustment due to the change over time of the friction torque as in the conventional braking device, and makes it possible to always adjust the braking torque having a stable cogging prevention function.

Further, the tension adjusting device according to the present invention comprises a magnetic member whose magnetic poles are induced by a magnetic field of a permanent magnet in which magnetic poles different in the circumferential direction are alternately magnetized, and a rotatable integral member with the magnetic member. A tension pulley provided, a rotatable member for changing an induction magnetic pole of the magnetic member, a braking torque adjusting mechanism for rotating the magnetic member and the rotatable member, and capable of engaging and disengaging the magnetic member. Further, since the structure is provided with the fixing means for restricting the rotation of the member to be rotated, it is possible to adjust the braking torque having a stable cogging prevention function at all times.

[Brief description of the drawings]

FIG. 1 is a front view of a tension adjusting device according to an embodiment of the present invention.

FIG. 2 is a rear view of the tension adjusting device of FIG. 1;

FIG. 3 is an expanded sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory view showing a state in which the engagement of the braking torque adjusting mechanism in FIG. 3 is disengaged and separated.

FIG. 5 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tension adjusting device 4 Braking device 5 Permanent magnet 6 Magnetic wheel 12 Magnetic member 13 Magnetic shielding plate 14 Torque adjusting mechanism

Claims (2)

(57) [Claims] A magnetic member whose magnetic poles are induced by a magnetic field of a permanent magnet in which magnetic poles different in the circumferential direction are alternately magnetized;
And the rotating member to change the induced magnetic poles of the magnetic member, the magnetic
A braking torque adjusting mechanism that rotates the movable member and the rotatable member and is capable of engaging with and disengaging from the magnetic member; and fixing means for restricting the rotation of the rotatable member. Braking device. 2. A magnetic member whose magnetic poles are induced by a magnetic field of a permanent magnet in which magnetic poles different in the circumferential direction are alternately magnetized,
A tension pulley disposed integrally rotatable with the magnetic member, a rotatable member for changing an induction magnetic pole of the magnetic member, a rotatable member for rotating the magnetic member and the rotatable member, and a connection with the magnetic member. A tension adjusting device, comprising: a braking torque adjusting mechanism that can be freely separated and fixed; and fixing means for restricting rotation of the rotated member.