JPH06219644A - Braking device and tensile force adjusting device using it - Google Patents

Abstract

PURPOSE:To prevent cogging phenomenon from being generated in the initial setting for decreasing braking torque by asynchronously turning a member to be rotated and a magnetic member by means of a braking torque adjusting mechanism. CONSTITUTION:In a tensile force adjusting device 1, the initial setting for decreasing braking torque of a braking device is carried out in, such a way that a magnetic member and a magnetic screening plate 14 are turned asynchronously by pushing up an adjusting rod 30 against a spring 39 and turning it. That is, since a moving body 36 is moved when both bevel gears are meshed with each other and a rotational cylinder body 35 is turned by the turning-movement of the adjusting rod 30, springs 25, 37, 38 are displaced so as to decrease spring force to be applied to a tension arm 24. Moreover, when the magnetic member and the magnetic screening plate 14 are asynchronously turned, the induction magnetic poles of the magnetic member are equalized by the asynchronous turning-movement. Moreover, unequal induction magnetic poles are newly formed in the magnetic member in the weak magnetic field, so that the coging can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rod which applies tension to a wire rod which is being guided to a winding machine or the like, and which is controlled so as not to break when an abnormal tension occurs in the wire rod. The present invention relates to a tension adjusting device for a material, and a braking device optimally 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 device.

Conventionally, a tension device of this type includes a tension pulley pivotally mounted on a braking shaft, a tension arm swingably mounted on a main body, and an auxiliary tension pivotally mounted at a tip end of the tension arm. It is known to have a pulley. In the tension device configured as described above, the linear material that has passed through the wire retainer such as felt from the snail guide is tensioned by being tensioned by being attached to the tension pulley and the auxiliary tension pulley.
Further, in such a tension device, if an abnormal tension is generated in the wire material guided to the winding machine or the like for some reason, the wire will be broken if the wire diameter is small and the elongation is small,
Usually, a braking device is provided in the main body of the device, and the mechanical or electrical control is automatically performed to reduce the tension of the filament material.

However, for example, the wire diameter is 0.01 to
It is difficult to prevent wire breakage due to abnormal tension for a thin linear material such as 0.1 mm by simply controlling the motor and tension device on the drive side. In recent years, such wire breakage can be prevented. A tension adjusting device has been developed which is equipped with a tensioning device and a braking device that can do this. This type of tension adjusting device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-193871. A permanent magnet type hysteresis brake is configured as a braking device in the tension adjusting device.
Hereinafter, these braking devices and a tension adjusting device using the braking device will be briefly described.

A magnetic shield plate is supported by a fixed housing as a main body of the apparatus via a bearing, and magnetic poles N and S different in the circumferential direction are alternately magnetized inside the 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 one end of this braking shaft is
A disk-shaped magnetic member facing the permanent magnet via a magnetic shield plate is mounted on the shaft, and a tension pulley is mounted on the other end. The magnetic shielding plate, the permanent magnet, the magnetic member, and the like constitute a braking device, and the permanent magnet and the magnetic wheel constitute a rotated member.

A crank, a sliding plate engaged with the crank, and a dial abutting on the sliding plate via a wave washer are arranged on the shaft which is on the same axis as the braking shaft. A friction ring and a spring are interposed between the moving plate and the magnetic shield plate. The magnetic shield plate is fixed to the fixed housing by the setting knob. Further, 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 between a stop bolt on the shaft and a bolt screwed to the fixed housing.

The tension adjusting device having such a structure is
After the linear material is contacted with the tension pulley through the snail guide and the wire retainer by approximately 360 degrees, the linear material is contacted by the auxiliary tension pulley pivotally attached to the tip of the tension arm by approximately 90 degrees and wound by the winder. If an abnormal tension is generated on the linear 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, it is rotated by the permanent magnet / magnetic wheel. Since the moving member is also rotated, the amount of magnetic flux detour to the magnetic member facing the permanent magnet via the magnetic shield plate is reduced, and the braking torque of the braking device is reduced. Therefore, it is possible to prevent the wire from breaking. In addition, since the friction mechanism having the friction ring is formed on the crank side fixed to the other end of the arm, it is guided by the magnetic member caused by the initial setting for reducing the braking torque of the braking device. It is also possible to avoid the occurrence of cogging due to the delay in the polarity change of the induction magnetic pole.

On the other hand, in addition to such a tension adjusting device, the braking torque of the braking device and the back tension of the tension device (in the above description, the tension arm is tensioned between the shaft integrated with the crank via the crank and the fixed housing). A tension adjusting device capable of simultaneously adjusting the spring force of a mounted spring is disclosed in Japanese Utility Model Laid-Open No. 62-133571. The tension adjusting device includes a permanent magnet type hysteresis brake as a braking device, a tension arm, a swingingly supported engagement plate, and a spring stretched between the tension arm and the engagement plate in a hollow box-shaped cover. Is provided.

The braking device has magnetic poles N and S which are different in the circumferential direction.
Are alternately magnetized, a cam plate whose outer peripheral surface is fixed to the back side of the permanent magnet and has a spiral peripheral surface, and a disc facing the front side of the permanent magnet with a gap. The permanent magnet is composed of a magnetic member, and the permanent magnet is supported by the cover through an adjusting screw screwed into a screw hole formed in the back surface of the cover.The disk-shaped magnetic member is on the same axis as the adjusting screw. The pulley shaft is supported by a boss hole, which is provided in the center of the front surface of the cover, and is supported by a bearing.

The tension arm is composed of a tension arm inside the cover and a tension arm outside the cover, which are axially attached to a shaft supported through a bearing in a boss hole formed in the upper front portion of the cover. An auxiliary tension pulley is pivotally attached to the tip of the. The engagement plate is
The braking device is comprised of an engaging portion that comes into sliding contact with the outer peripheral surface of the cam plate, and an arm portion that extends further from the engaging portion, and is swingably supported by a shaft that is planted on the back side of the cover.
Further, the other end of the spring, in which one hook is hooked on the inner tension arm, is hooked on the tip of the arm portion.

In the tension adjusting device for a linear member having such a structure, the linear member is attached to a tension pulley mounted on a braking shaft, and then attached to an auxiliary tension pulley of a tension arm to be wound up. It is taken up by the machine. Also at this time,
A constant tension is applied to the linear member by the braking torque of the braking device and the spring force of the spring that biases the tension arm of the tension device upward.

Here, when the tension is adjusted according to the wire diameter of the linear member, the adjusting screw is rotated to move the permanent magnet of the braking device forward or backward with respect to the magnetic member, so that the permanent magnet and the magnetic member are magnetically moved. The braking torque of the braking device is adjusted by changing the gap between the members. Further, since the cam plate with which the engagement plate slides is also rotated by the rotation of the adjusting screw, the spring force of the spring for urging the tension arm upward is increased by the amount that the permanent magnet advances and the braking force becomes stronger. Become
As the permanent magnet retracts and the braking force becomes weaker, the spring force of the spring that biases the tension arm upward becomes weaker. Therefore, the tension of the linear material can be adjusted without adjusting the braking torque and the back tension independently.

[0012]

In the former method, the tension arm is rotated to rotate the rotatable member composed of a permanent magnet / magnetic wheel or the rotatable member composed of a magnetic shielding plate, so that the winding is performed. The device is provided with a structure (generally referred to as a feedback mechanism) that absorbs the slight change in tension by changing the braking torque of the braking device, and is expected to have higher responsiveness. In addition, when performing initial setting for reducing the braking torque of the braking device having a permanent magnet, the residual magnetic flux density distribution of the magnetic member in the magnetic hysteresis curve, in other words, when the induction pole of the magnetic member is changed, the polarity of the induction magnetic pole is changed. Although the cogging phenomenon occurs due to the delay of the change, the cogging is prevented because the friction mechanism is configured.

However, in the prevention of cogging due to such friction torque, since the friction torque is reduced due to wear, it is necessary to make an adjustment with time. Further, such a cogging prevention mechanism is required only at the time of initial setting for reducing the braking torque of the braking device, and should not be operated in conjunction with the feedback mechanism during winding of the linear material. . The present invention has been made in view of the above circumstances, and has a feedback mechanism, and like the latter, a tension adjusting device capable of simultaneously adjusting braking torque and back tension and preventing cogging, and The present invention provides an optimum braking device for use in various tension adjusting devices.

[0014]

SUMMARY OF THE INVENTION A braking device according to the present invention is a magnetic member whose magnetic pole is induced by a magnetic field of a permanent magnet in which different magnetic poles are alternately magnetized in a circumferential direction, and an induction magnetic pole of this magnetic member. And a braking torque adjusting mechanism that has a rotation transmission mechanism that asynchronously rotates the magnetic member and the rotated member and that is engageable with and separable from the magnetic member. And

Further, in the tension adjusting device according to the present invention, a magnetic member whose magnetic pole is guided by a magnetic field of a permanent magnet in which different magnetic poles are alternately magnetized in the circumferential direction, and a magnetic member which is integrally rotatable with the magnetic member. A tension pulley provided, a rotated member for changing the induction pole of the magnetic member, a swingable tension arm connected to the rotated member, the magnetic member and the rotated member are asynchronous And a braking torque adjusting mechanism having a rotation transmitting mechanism that is capable of engaging with and separating from the magnetic member.

[0016]

In the present invention, cogging can be prevented by asynchronously rotating the rotated member and the magnetic member by the braking torque adjusting mechanism.

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings. FIG. 1 is a simplified explanatory view of a tension adjusting device according to the present invention, FIG. 2 is a sectional view of the braking device of FIG. 1, and FIG. 3 is a front view of a magnetic shield plate. In the figure, reference numeral 1
For example, the tension adjusting device implemented in the winding machine,
It is provided in the traveling path of the magnet coil 2 as a linear member. A hysteresis brake 4 as a braking device is fixed to a fixed housing 3 as a main body of the tension adjusting device 1 via an annular mounting plate 5.

The hysteresis brake 4 is mounted on the mounting plate 5 via a dish-shaped magnetic wheel 6 and has permanent magnets 7 in which different magnetic poles N and S are alternately magnetized in the circumferential direction.
And a braking shaft 10 having a disk-shaped magnetic member 9 rotatably inserted in the center of the permanent magnet 7 and facing the tension pulley 8 and the permanent magnet 7 with a gap therebetween on its axis,
A cylindrical body 11 rotatably provided around the braking shaft 10 and inserted through the bottom of the magnetic wheel 6, a disc 12 interposed in a gap between the magnetic member 9 and the permanent magnet 7, and a radius of the disc 12. Magnetic shield plate 14 as a rotated member having a plurality of slits 13 as demagnetization portions extending in the direction
And a locking piece 15 which is integrally provided on the outer peripheral edge of the disk 12 of the magnetic shield plate 14 and extends in the radial direction. Then, the braking shaft 1 of the hysteresis brake 4
Reference numeral 0 denotes a case 16 having a bottomed semi-cylindrical shape, and a bevel gear 17 is screwed to the insertion end.

Reference numerals 18 and 19 denote bearings interposed between the braking shaft 10 and the cylindrical body 11 of the magnetic shield plate 14,
20 is a collar interposed between these bearings 18 and 19;
Reference numeral 1 denotes a boss that positions the collar 20 and the bearings 18 and 19 in the axial direction. Further, 22 is a bearing interposed between the magnetic wheel 6 and the cylindrical body 11 of the magnetic shield plate 14, and 23 is a bearing that pivotally supports a part of the braking shaft 10.

Reference numeral 24 denotes a tension arm of the magnet coil 2, one end of which is connected to the hooking piece 15 via a spring 25, and is supported by a support 26 so as to be swingable. Reference numeral 27 denotes an auxiliary tension pulley as a guide member for guiding the magnet coil 2 from the tension pulley 8, which is pivotally attached to the other end of the tension arm 24.

Reference numeral 28 denotes a braking torque adjusting mechanism, which is a gear mechanism (rotation transmitting mechanism) A comprising the bevel gear 17 and another bevel gear 29 which are provided in the fixed housing 3 so as to be capable of advancing and retreating and rotating, and which can be engaged and separated. Through the braking shaft 10
An adjusting rod 30 as an adjusting member, a cylindrical body 35 connected to the adjusting rod 30 by a pin 32 inserted through a guide groove 31, and provided between two fixed guides 33 and 34; A moving body 36 with a flange that is screwed onto the outer peripheral surface of the moving body 35 and moves forward and backward in the axial direction by the rotation of the adjusting rod 30, and the magnetic shield plate stretched between the moving body 36 and the hooking piece 15. It is composed of an adjusting spring 37 that expands and contracts following the rotational movement of 14.

Further, 38 is a spring which is stretched between the hooking piece 15 and the fixed housing 3 and which is disposed on the side of the spring 25 and expands and contracts in the expansion and contraction direction of the spring 37. 39 is the adjusting member. A spring that gives the rod 30 a return habit, 40 is a snail guide that guides the magnet coil 2, and 41 is a stopper that regulates the movement of the adjustment rod 30 in the axial direction.

The magnet coil 2 is guided from the snail guide 40 to the tension pulley 8 and is approximately 36 mm.
It is assumed that, after being attached at 0 degrees, it is guided to the auxiliary tension pulley 27, attached at about 90 degrees, and wound up by a winder (not shown). The initial setting of the braking device 4 is that the magnetic field of the permanent magnet 7 is N pole-magnetic member 9-magnetic shield plate 14.
Since the magnetic circuit of the -S pole-magnetic wheel 6 is configured and the magnetic field of the permanent magnet 7 has a larger gap between the slit 13 and the gap between the magnetic shield plate 14 and the magnetic member 9,
An induction magnetic pole of the magnetic member 9 is formed by passing through the magnetic shield plate 14 from the pole and alternately forming a dense portion and a rough portion in the circumferential direction and having an uneven residual magnetic flux density distribution per unit magnetic pole area. And That is, the braking shaft 10 is assumed to be braked with the maximum braking torque.

In the tension adjusting device 1 for a linear member constructed as described above, the initial setting for reducing the braking torque of the braking device 4 pushes up the adjusting rod 30 against the spring force of the spring 39, After engaging 17 and 19
By rotating the adjusting rod 30, the magnetic member 9 and the magnetic shield plate 14 are asynchronously rotated. Then, a stable polarity is given to the magnetic member 9. That is, when the bevel gears 17 and 29 are engaged with each other, the adjusting rod 3
When the cylindrical body 35 rotates by the rotation of 0, the moving body 36
Moves in the axial direction, the springs 25 and 37
-38 is displaced and the balance of the tension arm 24 is lost. Further, when the magnetic member 9 and the magnetic shield plate 14 are asynchronously rotated, the induction magnetic pole of the magnetic member 9 having an uneven residual magnetic flux density distribution has a uniform residual magnetic flux density distribution after the asynchronous rotation. In the weak magnetic field of the short-circuited permanent magnet 7, a new induction pole of the magnetic member 9 having a non-uniform residual magnetic flux density distribution is formed. It is possible to prevent the cogging caused by.

Further, during the winding operation, the spring 39 disengages the gears 17 and 29 from each other to bring them into a separated state, and when an abnormal tension acts on the magnet coil 2, this tension causes the tension arm 2 to move.
4. Since the magnetic shield plate 14 rotates, the amount of magnetic flux detour to the magnetic member 9 is reduced by the rotational displacement of the magnetic shield plate 14 and the braking torque is reduced. Can be prevented in advance. At this time, the magnetic shield plate 14 rotates to rotate the slit 13
When the position is displaced from the position shown in FIG. 3 by 45 degrees, the magnetic flux circuit formed by the permanent magnets 7 becomes a short circuit that does not form the magnetic member 9, so that the braking torque becomes the minimum value.

On the other hand, when the abnormal tension on the magnet coil 2 is eliminated, the tension arm 24 returns to the initial setting state, and the magnet coil 2 shifts to the winding with a predetermined tension applied. In addition, in the present embodiment, the example in which the gear mechanism A including the two bevel gears 17 and 29 is used as the rotation transmission mechanism that can freely engage and disengage, but the present invention is not limited to this. Figure 4
Worm gear 51, worm wheel 52
Also, as a braking torque adjusting mechanism which is the gear mechanism B including the spur gears 53 to 56, the same effect as that of the above-described embodiment is obtained. This drawing is a simplified explanatory view showing another embodiment of the present invention. In the drawing, the same members as those in FIGS. 1, 2 and 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, the reference numeral 57 indicates that the worm gears 5 are connected to each other by pins 58.
1. An adjusting member including an adjusting rod 57a having 1 and an adjusting knob 57b that moves forward and backward in the axial direction of the adjusting rod 57a.
Reference numeral 9 denotes a moving body which is screwed into the adjusting rod 57a of the adjusting member 57 and moves forward and backward in the axial direction, 60 denotes a rotating lever provided on the adjusting knob 57b and pivotally supported by a pivot 61, 6
Reference numeral 2 is a connecting arm that swings by the rotation of the rotating lever 60, 63 is a spring stretched between the connecting arm 62 and the rotating lever 60, and 64 is a stretched member between the connecting arm 62 and the fixed housing 3. It is a spring.

Further, 65 is a support for rotatably holding the adjustment rod 57a in the fixed housing 3, 66 is a spring for giving a returning habit to the adjustment knob 57b, and 67 is a position restriction of the adjustment knob 57b in the axial direction. The stopper 68 is a detent piece, a part of which faces the guide groove 69 of the fixed housing 3 to restrict the rotation of the moving body 59, and 70 to 72 are pivots of the spur gears 53 to 55, respectively.

In the tension adjusting device for a linear member constructed as described above, when the adjusting knob 57b is pushed up against the spring force of the spring 66 in the initial setting, the rotating lever 60 is rotated.
Is rotated as indicated by the solid line to extend the spring 63. The spring force causes the connecting arm 62 to rotate against the spring force of the spring 64, and the gear 55 meshes with the gear 56 pivotally mounted on the braking shaft 10.

When the adjusting knob 57b is rotated in this state, the worm gear 51 and the gears 52.5 on the adjusting rod 57 are rotated.
3, the braking shaft 1 integrated with the gear 56 through the gears 54 and 55
0 is rotated, and the magnetic member 9 pivotally attached to the braking shaft 10
Is rotated. Further, the movable body 59 is also moved up and down by the rotation of the adjusting knob 57b, and the springs 25, 38.3, 3
7 is displaced and the balance of the tension arm 24 is lost. As in the previous embodiment, since the magnetic member 9 and the magnetic shield plate 14 rotate asynchronously, the induction pole of the magnetic member 9 having a non-uniform residual magnetic flux density distribution becomes uniform by the asynchronous rotation. After the residual magnetic flux density distribution is made, in the weak magnetic field of the short-circuited permanent magnet 7, an induction magnetic pole of the magnetic member 9 having a nonuniform residual magnetic flux density distribution is newly formed,
It is possible to prevent the cogging caused by the residual induction magnetic pole that was induced in the strong magnetic field.

In this embodiment, the permanent magnet 7 is divided into four N-S and N-S, but the present invention has two N-S poles, and the corresponding magnets are used. The number of slits 13 in the shielding plate 14 may be two. Further, although the demagnetization portion of the magnetic shield plate 14 is shown as the slit 13, the slit 13 may be filled with a non-magnetic material. Furthermore, those skilled in the art will appreciate that the elements of the rotation transmission mechanism according to the present invention are not limited to the above-described embodiments, and that transmission elements can be changed as appropriate, and the braking device 4 is not limited to the embodiments. It will be easily understood.

[0031]

As described above, according to the present invention, the braking device includes a magnetic member whose magnetic pole is induced by a magnetic field of a permanent magnet in which different magnetic poles are alternately magnetized in the circumferential direction, and this magnetic member. Of the rotating member for changing the induction magnetic pole, and the braking torque adjusting mechanism having a rotation transmitting mechanism for asynchronously rotating the magnetic member and the rotated member and capable of engaging and separating. In the initial setting to reduce the braking torque, the residual induction magnetic pole of the magnetic member that was induced by the strong magnetic field of the permanent magnet can be changed quickly, and the cogging phenomenon caused by the residual induction magnetic pole of the magnetic member can be prevented. In addition, it is not necessary to adjust the friction torque with time as in the conventional friction mechanism.

Further, a tension adjusting device having a feedback mechanism is arranged such that a magnetic member whose magnetic pole is guided by a magnetic field of a permanent magnet in which different magnetic poles are alternately magnetized in a circumferential direction and a magnetic member are integrally rotatable with this magnetic member. A tension pulley provided, a rotated member for changing the induction pole of the magnetic member, a swingable tension arm connected to the rotated member, the magnetic member and the rotated member are asynchronous Since it has a structure that includes a braking torque adjusting mechanism that has a rotation transmission mechanism that freely rotates and engages and disengages freely, it is guided by the strong magnetic field of the permanent magnet in the initial setting to reduce the braking torque of the tension pulley. The residual induction magnetic pole of the existing magnetic member can be quickly changed, and the cogging phenomenon generated by the residual induction magnetic pole of the magnetic member can be prevented. Therefore, it is possible to prevent wire breakage of the linear material due to cogging, and it is not necessary to adjust the friction torque over time as in the conventional friction mechanism.

[Brief description of drawings]

FIG. 1 is a simplified explanatory view of a tension adjusting device according to the present invention.

2 is a cross-sectional view of the braking device of FIG.

FIG. 3 is a front view of a magnetic shield plate.

FIG. 4 is a simplified explanatory view of another tension adjusting device according to the present invention.

[Explanation of symbols]

 1 Tension control device 2 Magnet coil 3 Fixed housing 4 Hysteresis brake 7 Permanent magnet 8 Tension pulley 9 Magnetic member 10 Braking shaft 12 Disc 13 Slit 14 Magnetic shield plate 24 Tension arm 25 Spring 26 Support 27 Auxiliary tension pulley 28 Braking torque adjustment mechanism

[Procedure amendment]

[Submission date] October 26, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

In the tension adjusting device having such a structure, the linear member is attached to the tension pulley through the snail guide and the wire retainer by approximately 360 degrees, and then the tension adjusting device is attached to the auxiliary tension pulley pivotally attached to the tip of the tension arm by approximately 90 degrees. Coordinate and wind with a winder. If an abnormal tension is generated on the linear 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, it is rotated by the permanent magnet / magnetic wheel. Since the moving member is also rotated, the amount of magnetic flux detour to the magnetic member facing the permanent magnet via the magnetic shield plate is reduced, and the braking torque of the braking device is reduced. Therefore, it is possible to prevent the wire from breaking. Further, since the friction mechanism having the friction ring is formed on the crank side fixed to the other end of the arm, it is possible to avoid the occurrence of cogging caused by the initial setting for reducing the braking torque of the braking device. .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

By the way, in the former case, the tension arm is rotated to rotate the rotated member composed of the permanent magnet / magnetic wheel or the rotated member composed of the magnetic shielding plate, thereby winding the winding member. A structure that absorbs a slight change in tension by changing the braking torque of the braking device (generally called a feedback mechanism).
It is a device that is equipped with and is expected to have higher responsiveness. In other words, when performing the initial setting for reducing the braking torque of the braking device having the permanent magnet , in other words,
Although the cogging phenomenon occurs when the induction magnetic pole of the magnetic member is changed, the cogging is prevented because the friction mechanism is configured.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

The magnet coil 2 is guided from the snail guide 40 to the tension pulley 8 and is approximately 3
It is assumed that, after being spliced at 60 degrees, it is guided to the auxiliary tension pulley 27, splined at approximately 90 degrees and wound up by a winder (not shown). Further, in the initial setting of the braking device 4, the magnetic field of the permanent magnet 7 constitutes a magnetic circuit composed of N pole -magnetic shield plate 14 -magnetic member 9-magnetic shield plate 14-S pole-magnetic wheel 6 and is permanent. The magnetic field of the magnet 7 is larger than the gap between the magnetic shield plate 14 and the magnetic member 9 in the slit 13, so that the magnetic field passes through the magnetic shield plate 14 from the N pole,
It is assumed that the magnetic poles of the magnetic member 9 are formed such that the magnetic flux density distribution is alternately dense and coarse in the circumferential direction and is nonuniform per unit magnetic pole area. That is, the braking shaft 10
Is braked with the maximum braking torque.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

In the tension adjusting device 1 for a linear member configured as described above, the initial setting for reducing the braking torque of the braking device 4 is to push up the adjusting rod 30 against the spring force of the spring 39, After engaging 17 and 19 with each other, the adjusting rod 30 is rotated to asynchronously rotate the magnetic member 9 and the magnetic shield plate 14 . That is, when the cylindrical body 35 is rotated by the rotation of the adjusting rod 30 in the engaged state in which the bevel gears 17 and 29 are meshed with each other, the moving body 36 moves in the axial direction.
37 and 38 are displaced and act on the tension arm 24 .
Spring force becomes weak. Further, the magnetic member 9 and the magnetic shield plate 14
To rotate asynchronously in the direction of decreasing tension
And the magnetic member 9 having the non-uniform induction pole is
The induction pole becomes uniform due to the asynchronous rotation. And
The magnetic member 9 in the weak magnetic field has a new non-uniform induction pole.
As it is formed, cogging can be prevented.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

When the adjusting knob 57b is rotated in this state, the worm gear 51 and the gears 52.5 on the adjusting rod 57 are rotated.
3, the braking shaft 1 integrated with the gear 56 through the gears 54 and 55
0 is rotated, and the magnetic member 9 pivotally attached to the braking shaft 10
Is rotated. Further, the movable body 59 is also moved up and down by the rotation of the adjusting knob 57b, and the springs 25, 38.3, 3
7 is displaced and the spring force acting on the tension arm 24 is
become weak. Then, as in the previous embodiment, the magnetic member 9 and the magnetic shield plate 14 are rotated asynchronously, so that
Grayed can be prevented.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

[0031]

As described above, according to the present invention,
The braking device includes a magnetic member whose magnetic pole is guided by the magnetic field of a permanent magnet in which different magnetic poles are alternately magnetized in the circumferential direction, a rotated member which changes the magnetic pole of the magnetic member, and these magnetic members and the magnetic member. having a structure in which a braking torque adjustment mechanism having an engagement spaced freely rotation transmitting mechanism with asynchronously rotating the rotating member, cogging which Oite occur initial setting to reduce the braking torque The phenomenon can be prevented, and it is not necessary to adjust the friction torque with time as in the conventional friction mechanism.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

Further, a tension adjusting device having a feedback mechanism is arranged such that a magnetic member whose magnetic pole is guided by a magnetic field of a permanent magnet in which different magnetic poles are alternately magnetized in a circumferential direction, and the magnetic member are integrally rotatable. A tension pulley provided, and a rotated member that changes the induction pole of the magnetic member,
A swinging tension arm connected to the rotatable member, and a braking torque adjusting mechanism having a rotation transmitting mechanism that asynchronously rotates the magnetic member and the rotatable member and is freely engageable and separable. since the structure with, the initial setting to reduce the braking torque of the tension pulley
The cogging phenomenon that occurs There can be prevented. Therefore,
It is possible to prevent disconnection of the linear material due to cogging, and it is not necessary to adjust the friction torque with time as in the conventional friction mechanism.

Claims (2)

[Claims] 1. A magnetic member in which magnetic poles are induced by a magnetic field of a permanent magnet in which different magnetic poles are alternately magnetized in a circumferential direction,
A rotatable member that changes the induction magnetic pole of the magnetic member, and a braking torque adjusting mechanism that has a rotation transmitting mechanism that asynchronously rotates the magnetic member and the rotatable member and that can be engaged with and separated from the magnetic member. A braking device comprising: 2. A magnetic member, the magnetic poles of which are induced by the magnetic field of a permanent magnet in which different magnetic poles are alternately magnetized in the circumferential direction,
A tension pulley that is integrally rotatable with the magnetic member, a rotatable member that changes an induction magnetic pole of the magnetic member, a swingable tension arm that is connected to the rotatable member, and the magnetic member. And a braking torque adjusting mechanism having a rotation transmitting mechanism that is capable of asynchronously rotating the rotated member and engaging with and separating from the magnetic member.