KR20180112827A - Torque limiter and separation mechanism - Google Patents

Abstract

A first rotating body having a cylindrical outer circumferential portion made of a permanent magnet and a cylindrical inner circumferential portion made of a hysteresis material facing the cylindrical outer circumferential portion and being rotatable relative to each other so as to be coaxial with the first rotating body, (22 deg. C / 22 deg. C) of the dynamic modulus of elasticity (E1) (22 deg. C) and the loss tangent (tan delta (22 deg. C)) fixed to the outer periphery of the second rotating body 20 MPa or more, and a dynamic modulus of elasticity (E1) (22 캜) of 1.0 MPa or more and 10 MPa or less.

Description

Torque limiter and separation mechanism

The present invention relates to a torque limiter and a separation mechanism.

There is known a torque limiter comprising a rotating member and a torque generating means for giving a predetermined torque to the rotation of the rotating member, and a torque limiter in which a surface treatment portion having a friction coefficient is formed on the outer surface of the rotating member is known One).

1. A rotation transmitting device for performing torque transmission between an inner rotating body and a outer rotating body rotatable relative to each other in a coaxial manner by hysteresis torques, wherein the inner rotating body is made of a semi-hard magnetic material, And a cylindrical inner peripheral portion opposed to the outer peripheral portion of the inner rotary body with a gap therebetween. The cylindrical inner peripheral portion of the outer rotary body is provided with at least an inner peripheral surface thereof with a multi- (Refer to Patent Document 2)

Patent Document 1: JP-A-2009-190888 Patent Document 2: JP-A-2005-147296

The present invention provides a torque limiter integrally provided with an elastic body capable of suppressing an increase in the amount of change in outer diameter, and a separation mechanism capable of suppressing deterioration of separation performance for a long term (long term) by using the torque limiter .

In order to solve the above problems, a torque limiter according to claim 1,

A first rotating body having a cylindrical outer peripheral portion made of a permanent magnet,

A second rotating body having a cylindrical inner peripheral portion made of a hysteresis material opposite to the cylindrical outer peripheral portion and provided so as to be rotatable relative to each other in a coaxial manner with the first rotating body;

(Ratio) E1 (22 deg. C) / tan? (22 deg. C) between the dynamic elastic modulus E1 (22 deg. C) and the loss tangent (22 占 폚) of 20 MPa or more and a dynamic modulus of elasticity (E1) (22 占 폚) of 1.0 MPa or more and 10 MPa or less.

According to a second aspect of the present invention, in the torque limiter according to the first aspect,

And the hysteresis material has a circumferential anisotropy.

In order to solve the above problem, in the separation mechanism according to claim 3,

A sheet feeding roller for feeding a sheet material to be fed,

And a torque limiter according to claim 1 or 2, which separates the sheet material other than the uppermost sheet material out of a plurality of sheet materials sent out in pressure contact with the sheet feeding roller .

According to a fourth aspect of the invention, in the separating mechanism according to the third aspect,

And the feeding roller includes the elastic body.

According to the invention as set forth in claim 1, it is possible to suppress an increase in the amount of change in the outer diameter of the torque limiter having an elastic body integrally, and to suppress the paper feeding (double feeding) in the separation mechanism.

According to the invention as set forth in claim 2, the deviation of the initial torque can be further reduced while the hysteresis torque of the torque limiter is increased, and the torque limiter can be downsized.

According to the invention as set forth in claim 3, the separating mechanism can be downsized and its service life can be prolonged.

According to the invention as set forth in claim 4, abrasion of the sheet feeding roller can be suppressed.

1 is a schematic view of a longitudinal section of a torque limiter.
Fig. 2 (a) is a schematic view showing a method of treating a magnetic field of a hysteresis material in the form of a flat plate, Fig. 2 (b) is a schematic diagram showing the direction of magnetic field treatment, and Fig. 2 (c) is a view showing a hysteresis material in an anisotropic direction.
Fig. 3 (a) is a schematic sectional view of a sheet feeding apparatus including a separating mechanism using a torque limiter, Fig. 3 (b) is a schematic cross-sectional view showing the operation of the separating mechanism when separating a plurality of sheets, Sectional view showing the operation of the separating mechanism when the sheet of paper is transported.
4 is a diagram showing the relationship between E1 (22 DEG C) / tan delta (22 DEG C) in Examples 1 to 4 and Comparative Example 1 and the amount of change in outer diameter of the drawn roller.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail by way of embodiments and specific examples with reference to the drawings, but the present invention is not limited to these embodiments and specific examples.

It should be noted that, in the following description using the drawings, the drawings are schematic, and that the ratios of the dimensions and the like are different from those of the real world. In order to facilitate comprehension, have.

(1) Constitution of torque limiter

Fig. 1 is a schematic cross-sectional view of the torque limiter 1 according to the present embodiment, Fig. 2 (a) is a schematic view showing a magnetic field processing method of a flat hysteresis material, and Fig. 2 (b) (C) is a view showing the hysteresis material of the circumferential direction anisotropy.

The torque limiter 1 includes a first rotating body 10 and a second rotating body 20. One end of the first rotating body 10 is rotatably supported by one end of the second rotating body 20 and the other end of the first rotating body 10 is rotatably supported by the second rotating body 20 And the other end is rotatably supported.

(1. 1) The first whole

The first rotating body 10 is constituted by a hollow shaft 11 and a permanent magnet 12 as an example of a cylindrical outer peripheral portion fixed to the outer peripheral surface of the shaft 11.

The shaft 11 is made of, for example, a synthetic resin material. Specific examples of the synthetic resin material include polyacetal (POM), polypropylene (PP), polycarbonate (PC) have.

It is preferable that the permanent magnets 12 are multipolarly magnetized. Specifically, the ferrite magnets and the rare earth magnets have multipolar magnetization (14 poles in this embodiment). It is preferable to use rare earth magnets in view of downsizing of the torque limiter and high torque. Examples of rare earth magnets include Nd-Fe-B magnets, Sm-Fe-N magnets and Sm-Co magnets .

The torque ripple of the hysteresis torque generated between the first rotating body 10 and the second rotating body 20 can be suppressed by multipolar magnetization of the permanent magnet.

(1.2) The second whole

The second rotating body 20 includes a hollow housing 21 and a hysteresis member 22 as an example of a cylindrical inner circumferential portion secured to a portion of the inner circumferential surface of the housing 21 opposed to the permanent magnet 12 And a rubber layer 30 as an example of an elastic body fixed to the outer circumferential surface of the housing 21.

(1..2.1) Hysteresis material

The hysteresis material 22 is formed by performing a specific magnetic field treatment on a semi-hard magnetic material selected from the group consisting of Fe-Cr-Co, Fe-Mn, Al-Ni and Al-Ni-Co.

More specifically, the hot-rolled and cold-rolled semi-hard magnetic material is cut into a flat plate shape (rectangular shape), and the obtained semi-rigid magnetic material plate 220 is cut into a magnetic field processor The magnetic field treatment is carried out with the magnetic field alignment direction set to a certain direction (see arrow B in the figure) as shown in Fig. 2 (b). Thereafter, the plate-like semi-hard magnetic body 220 is subjected to a bending process in a cylindrical shape, and subjected to an aging treatment after polishing.

By this processing method, cylindrical hysteresis material 22 which is anisotropic in the circumferential direction (circumferentially anisotropic) as shown in Fig. 2 (c) is obtained.

The hysteresis material 22 is circumferentially anisotropic in the circumferential direction, so that the hysteresis torque of the torque limiter 1 is increased, and the torque limiter 1 can be further downsized.

The hysteresis material 22 having the circumferential directional anisotropy can obtain regular anisotropy by a method of subjecting the plate-like semi-hard magnetic body 220 to magnetic field treatment. When a plurality of the hysteresis material 22 are mass-produced at one time, The deviation of the initial torque of the limiter 1 is suppressed to be smaller.

(1.2.2) rubber layer

The rubber layer 30 has a dynamic elastic modulus E1 (22 deg. C) and a loss tangent (tan delta 22 deg. C) (E1 22 deg. ) (22 캜) of 1.0 MPa or more and 10 MPa or less. The ratio (E1 (22 占 폚) / tan? (22 占 폚) of the dynamic modulus of elasticity (E1) (22 占 폚) to the loss tangent (tan?) (22 占 폚) is preferably 30 MPa or more.

The dynamic elastic modulus El (22 占 폚) can be obtained by measuring the temperature distribution of dynamic viscoelasticity. It is the value of the dynamic modulus of elasticity (El) when the measured temperature is 22 占 폚 at room temperature.

The loss tangent (tan?) (22 占 폚) can be obtained by measuring the temperature dispersion of the dynamic viscoelasticity. The loss tangent (tan?) Is a value at 22 占 폚 at room temperature.

The above relationship can be expressed by the following equation.

[Formula 1]

E1 / tan?? 20 MPa

1.0 MPa ≤

When the rubber composition of the rubber layer 30 has a ratio E2 (22 deg. C) / tan? (22 deg. C) of the dynamic modulus of elasticity E1 (22 deg. C) to the loss tangent It is possible to suppress an increase in the amount of change in outer diameter caused by abrasion of the rubber layer 30 of the torque limiter 1 when the limiter 1 is used in the separating mechanism.

The dynamic modulus of elasticity El (22 占 폚) is 1.0 MPa or more and 10 MPa or less. When the dynamic modulus of elasticity El (22 DEG C) is smaller than 1.0 MPa, the abrasion resistance of the rubber layer 30 is lowered and the change in the outer diameter becomes larger. When the dynamic modulus of elasticity E1 (22 DEG C) is larger than 10 MPa, when the initial friction coefficient is low and one sheet of paper P is conveyed to the nip portion (N) when used in the separation mechanism The torque limiter 1 of the rubber layer 30 of the rubber layer 30 may become unstable and the rubber layer 30 may be unevenly worn or unusual (see Fig. 3 (c)). The friction coefficient between the rubber layer 30 and the paper P is lower than the coefficient of friction between the paper and the double feeding is caused when two or more sheets P are conveyed to the nip portion N (See Fig. 3 (b)).

The loss tangent (tan?) (22 占 폚) is preferably 0.01 or more and 0.1 or less. When the loss tangent tan (?) (22 占 폚) is less than 0.01, the amount of the filler in the rubber composition is small and the crosslinking density is high, so that the mechanical strength becomes small and the rubber layer 30 may be destroyed.

When the loss tangent tan δ (22 캜) is larger than 0.1, the friction between the polymer main chain and the filler and between the polymer main chain and the filler (loss) occurring at the time of deformation of the rubber layer 30 becomes large, May be deteriorated.

The rubber layer 30 is not particularly limited as long as it is a rubber material, but specifically it is preferable to use ethylene propylene copolymer rubber (EPDM) as a main component.

Examples of rubber materials other than EPDM include natural rubber, isoprene rubber, butadiene rubber, butyl rubber, styrene butadiene rubber, polynorbornene rubber, butadiene-nitrile rubber, chloroprene rubber, halogenated butyl rubber, Epichlorohydrin rubber, and the like.

When EPDM is used as the rubber material, the EPDM may be either a non-oil-extended grade or a genuine grade, or a mixture of a non-oil grade and a dielectric grade. However, the weight of extruded oil in the EPDM of the oil grade is treated as the weight of the softening agent (oil amount (amount)).

(2) Configuration of separation mechanism

Fig. 3 (a) is a sectional schematic view of a sheet feeding apparatus including a separation mechanism using a torque limiter, Fig. 3 (b) is a sectional schematic view showing the operation of the separation mechanism when separating a plurality of sheet bundles c is a schematic sectional view showing the operation of the separating mechanism when conveying a single sheet of paper.

The paper feeding device 100 includes a paper cassette 110 on which a sheet P as a sheet material is stacked and a pair of rails 120 for feeding the paper P from the paper cassette 110 in contact with the leading end side of the upper surface of the paper P, And a separation mechanism 50 for separating (conveying) the paper P fed from the nap roller 120 one by one.

A separation mechanism 50 is disposed downstream of the roller 120 in the sheet conveying direction. The separating mechanism 50 is provided with a feed roller 2 as an example of a sheet feeding roller and a rubber layer 30 as a putter roller which is placed under pressure against the feed roller 2 under the feed roller 2 And a torque limiter 1. Between the feed roller 2 and the torque limiter 1 is formed a nip portion N for holding the paper P fed out from the paper cassette 110. [

In the feed roller 2, a rubber layer 2b is fixed to the outer circumferential surface of a hollow core member 2a through which a rotating shaft for transmitting a driving force is inserted.

The rubber layer 2b is preferably made of the same rubber composition as the rubber layer 30 of the torque limiter 1. [ Specifically, the rubber layer 2b preferably has a ratio (E1 (22 占 폚 / tan? (22 占 폚)) of dynamic modulus of elasticity (E1) (22 占 폚) to loss tangent And a dynamic elastic modulus El (22 占 폚) of 1.0 MPa or more and 10 MPa or less.

The feed roller 2 is a drive roller which is rotationally driven on this axis by a driving source not shown in the axial direction perpendicular to the paper conveying direction and the feed roller 2 is driven from the paper cassette 110 (Front surface) of the sheet P conveyed to the nip N and is driven to rotate, the sheet P is conveyed downstream (see arrow R in the figure).

The torque limiter 1 is a reversible roller that rotates in a reverse direction while being pressed against the feed roller 2 by a drive source (not shown) with the direction orthogonal to the sheet conveying direction being the axial direction, The conveying resistance is applied to the paper P from the lower surface side (back side) when the paper P is stacked and conveyed to the nip portion N so that the feeding of the paper P conveyed by the feed roller 2 (See Fig. 3 (b)).

The paper P is brought into contact with the surface of the feed roller 2 and friction with the paper P is applied to the torque limiter 1 so that the rotational force The torque limiter 1 follows the rotation of the torque limiter 1 and the paper P is transported downstream (see Fig. 3 (c)).

Further, the torque limiter 1 may be a driven roller that is rotated on a shaft without applying a reverse driving force.

In this way, in the separating mechanism 50, when the plurality of sheets of paper P are overlapped and conveyed to the nip portion N, the torque limiter 1 functions as a brake, (From the back side), thereby suppressing the feeding of the sheet P conveyed by the feed roller 2.

In this separation mechanism 50, the torque limiter 1 that transmits torque by the hysteresis torque based on hysteresis loss has a durability higher than that of the spring type torque limiter, and a rubber layer 30 are low in durability, the separation performance may deteriorate and the life of the separation mechanism 50 may be shortened, even though the transmission torque is maintained.

The separation mechanism 50 using the torque limiter 1 according to the present embodiment as a putter roller has a torque limiter 1 for separating a plurality of sheets of paper P in cooperation with pressure contact with the feed roller 2 (E1 (22 占 폚 / tan? (22 占 폚)) of the dynamic modulus of elasticity (E1) (22 占 폚) to the loss tangent ° C) of 1.0 MPa or more and 10 MPa or less.

Therefore, it is possible to suppress the increase in the change in the outer diameter due to wear of the rubber layer 30 of the torque limiter 1, and to prolong the life of the torque limiter 1.

Example

"Creating a torque limiter"

The first rotating body 10 was fixed by inserting a permanent magnet 12 having an outer diameter of 14.37 mm, an inner diameter of 11.47 mm, a number of irregular poles of 14 poles and a magnetization pitch of 3.22 mm into a hollow shaft 11.

The second rotating body 20 was fixed by inserting a circumferential anisotropic hysteresis material having an outer diameter of 15.60 mm and an inner diameter of 14.80 mm into the housing 21. Also, a torque limiter of a comparative example using an anisotropic radial hysteresis material having an outer diameter of 15.60 mm and an inner diameter of 14.80 mm was also prepared.

The torque limiters in this embodiment and the comparative example are all the same in the material, dimensions, and the like of the constituent members other than the orientation direction of the magnetic field of the hysteresis material.

"Evaluation of maximum torque of torque limiter"

Table 1 shows the results of measuring the maximum torque by preparing fifteen torque limiters in each of the examples and comparative examples.

[Table 1]

The maximum torque of the comparative torque limiter was 314 gfcm at the maximum, 278 gfcm at the minimum, and 36 gfcm at the deviation. On the other hand, the maximum torque of the torque limiter of the embodiment was 326 gfcm at the maximum, 312 gfcm at the minimum, and 14 gfcm at the deviation.

These results show that the torque limiter of the embodiment using the circumferential directional anisotropic hysteresis material is larger than the torque limiter of the comparative example using the radial direction anisotropic hysteresis material and the maximum torque is large and the deviation is small. Therefore, in the torque limiter of the embodiment using the circumferential directional anisotropic hysteresis material, the hysteresis torque is increased, the torque limiter can be further downsized, the rubber layer 30 is disposed on the outer surface of the torque limiter, Is suitable.

&Quot; Preparation of rubber composition "

The rubber composition of the rubber layer 30 of the torque limiter 1 according to the present embodiment contains a predetermined amount of a polymer component, a crosslinking agent, and a predetermined amount of a softening agent, filler, other vulcanization accelerator, And an additive such as an antistatic agent were kneaded using a kneader to obtain an unvulcanized rubber composition. The rubber composition was vulcanized and molded in a predetermined mold at 160 DEG C for 30 minutes, and then vulcanization was carried out at 160 DEG C for 60 minutes under the conditions of 2 The car was vulcanized.

Thereafter, the molded rubber tube is polished until a desired outer diameter is obtained in a cylindrical grinding machine, and after cutting to a desired length, the rubber tube 30 is inserted into the outer peripheral surface of the housing 21 as shown in Fig. 1 And the torque limiter of the example and the comparative example provided with the rubber layer 30 were prepared.

&Quot; Measurement of viscoelastic properties "

A combination of a predetermined amount of a polymer component, a crosslinking agent and a predetermined amount of a softener, filler, other vulcanizing accelerator, vulcanization accelerating assistant, and an additive such as an antioxidant is kneaded using a kneader, At 160 DEG C for 30 minutes, and further subjected to secondary vulcanization at 160 DEG C for 60 minutes. Thus, a sheet-shaped rubber cross-linked product was obtained. From this sheet, a sample of a small tag having a width of 5 mm, a length of 20 mm and a thickness of 2 mm was struck to obtain a rubber composition for measuring viscoelastic properties.

The viscoelasticity (temperature dispersion) of the sample subjected to the test was measured using a dynamic viscoelasticity measuring apparatus (Rheogel E4000FHP manufactured by UBM) according to JIS K 6394 (dynamic property testing method / small test apparatus for vulcanized rubber and thermoplastic rubber) Were measured under one measurement condition.

Measuring temperature: -84 ° C to 120 ° C

Temperature rise rate of measurement temperature: 2 占 폚 / min

Measuring temperature interval: 1 ℃

Measuring frequency: 10㎐

Initial distortion: 1.3 mm

Amplitude: 2 탆

Deformation Mode: Seal

Distance between chucks 10 mm

Waveform: sinusoidal wave

From the measurement results of the respective samples thus prepared, values of dynamic elastic modulus (E1) (22 DEG C) and loss tangent (tan?) (22 DEG C) were read.

"Notification (Pass) Test"

A torque limiter equipped with rubber layers 30 of Examples and Comparative Examples was mounted on DocuPrint 4050 (manufactured by Fuji Xerox Co., Ltd.), and the paper "Business 4200" (manufactured by Xerox) was notified of 50,000 sheets under conditions of a temperature of 10 ° C and a humidity of 15% RH (Passing through). The measurement of the external diameter variation [mm] was performed at a temperature of 10 ° C and a humidity of 15% RH at the point of 5000 sheets, 10,000 sheets, 20000 sheets, 30000 sheets, 40,000 sheets, and 50,000 sheets after the start of the notification test.

Here, the "change in outer diameter" means the amount of change in the outer diameter of the rubber layer 30 of the initial torque limiter 1 (litter roller) from the outer diameter of the rubber layer 30 of the torque limiter 1 (litter roller) 30). The smaller the absolute value of the change in outer diameter is, the less the rubber layer 30 is shaved and the better the abrasion resistance is.

&Quot; Evaluation of viscoelastic characteristics and notification performance "

Table 2 shows the mechanical properties, viscoelastic characteristics, and notification evaluation of the separation mechanism 50 using the rubber composition according to Examples 1 to 4 and Comparative Example 1. 4 shows the ratio (E1 (22 deg. C) / tan delta (22 deg. C)) between the dynamic modulus of elasticity (E1) (22 deg. C) and the loss tangent And the change in the outer diameter of the rubber layer 30 of the limiter 1 (litter roller). Table 3 shows the relationship between the viscoelastic characteristics and the change in outer diameter in Comparative Examples 1 to 3.

[Table 2]

[Table 3]

Table 4 shows the compounding ratios of the rubber compositions of Examples 1 to 4 and Comparative Examples 1 to 3. The rubber compositions used in these examples and comparative examples consisted of ethylene propylene copolymer rubber (EPDM) as a main component. In Table 4, " polymer component " represents a polymer component occupying in the rubber composition. The term " oil component " refers to an oil component occupying in the rubber composition, and includes a stretched oil in the polymer component and an oil used as a softener. The "other component" refers to components other than the polymer component and the oil component occupying in the rubber composition, and includes a crosslinking agent (vulcanizing agent), a vulcanization accelerator, a processing aid, a vulcanization accelerator, a filler and a reinforcing filler.

[Table 4]

(22 deg. C) / tan? (22 deg. C) of the dynamic modulus of elasticity (El) (22 deg. C) and the loss tangent Is 20 [MPa] or more, the amount of change in the outer diameter of the rubber layer 30 as the putting roller is suppressed, and the life of the separating mechanism 50 is long.

The dynamic elastic modulus E1 (22 占 폚) is related to the amount of deformation of the feed roller 2 of the separation mechanism 50 and the rubber layer 30 of the torque limiter 1, The deformation amount of the rubber layer 30 of the feed roller 2 and the torque limiter 1 can be suppressed and the slip relative to the paper P can be reduced and the wear resistance can be improved.

On the other hand, by setting the loss tangent (tan?) (22 deg. C) lower, for example, by the loss tangent tan? (22 deg. C) less than 0.1, the polymer main chain and the filler The friction (loss) between the fillers can be reduced.

As a result, it was found that by making the ratio of the dynamic modulus of elasticity E1 (22 DEG C) to the loss tangent (tan delta) (22 DEG C) (E1 (22 DEG C) / tan? It can be expected that it can be improved.

In Comparative Example 1, the ratio (E1 (22 占 폚) / tan? (22 占 폚)) of the dynamic modulus of elasticity (E1) (22 占 폚) to the loss tangent Of the outer diameter of the drawn roller was -0.1134 mm, and the amount of change in the outer diameter of the drawn roller was -0.2080 and the wear amount was large.

As shown in Table 3, in Comparative Example 2, the ratio (E1 (22 占 폚 / tan? (22 占 폚)) of the dynamic modulus of elasticity (E1) (22 占 폚) to the loss tangent , The absolute value of the outer diameter change amount of the take roller may be larger than that of the embodiment.

In Comparative Example 2, the dynamic modulus of elasticity (El) (22 占 폚) was as low as 0.81 MPa. As a result, it is presumed that the deformation amount of the rubber layer 30 of the torque limiter 1 is large and the wear resistance is poor.

In Comparative Example 3, the conveyance occurred from the initial stage of the notification, and could not be employed as the litter roller. This result indicates that the nip amount between the sheet P and the putter roller is small and the difference between the sheet thickness and the sheet thickness is small because the comparative example 3 has a dynamic elastic modulus E1 (22 DEG C) of 26.62 [ It is presumed that the frictional coefficient between the putter roller and the paper P is lower than the frictional coefficient between the paper and the plunger.

As a result, if the dynamic modulus of elasticity (E1) (22 DEG C) is 1.0 MPa or more and 10 MPa or less, a rubber composition capable of suppressing a variation in outer diameter without being conveyed by notification can be obtained.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention described in the claims. For example, the rubber composition constituting the rubber layer 30 is not limited to EPDM or the like. The ratio of the dynamic modulus of elasticity (E1) (22 占 폚) to the loss tangent (tan? (22 占 폚) of 20 MPa or more and a dynamic elastic modulus (E1) (22 占 폚) of 1.0 MPa or more and 10 MPa or less.

1: Torque limiter
10: 1st whole
11: Shaft
12: permanent magnet
20: 2nd whole
21: Housing
22: Hysteresis material
30: rubber layer
40:
50: separation mechanism
1: Lit roller (torque limiter)
2: Feed roller
100: Paper feeding device
110: Paper cassette
120: The roller

Claims (4)

A first rotating body having a cylindrical outer peripheral portion made of a permanent magnet,
A second rotating body having a cylindrical inner peripheral portion made of a hysteresis material facing the cylindrical outer peripheral portion and provided so as to be rotatable relative to each other in a coaxial manner with the first rotating body;
And an elastic body fixed to an outer peripheral portion of the second rotating body,
Wherein when the elastic modulus of the elastic body at a temperature of 22 占 폚 is E1 and the loss tangent is tan ?, the elastic body satisfies the following relational expression.
E1 / tan?
1.0 MPa ≤ The method according to claim 1,
Wherein the hysteresis material has a circumferential anisotropy. A sheet feeding roller for feeding a sheet material to be fed,
The separating mechanism according to any one of claims 1 to 3, further comprising a torque limiter according to claim 1 or 2, which separates the sheet material other than the sheet material at the uppermost position among a plurality of sheet materials which are brought into pressure contact with the sheet feeding roller. The method of claim 3,
And the feeding roller includes the elastic body.

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