WO2017200015A1 - トルクリミッタ及び分離機構 - Google Patents
トルクリミッタ及び分離機構 Download PDFInfo
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- WO2017200015A1 WO2017200015A1 PCT/JP2017/018565 JP2017018565W WO2017200015A1 WO 2017200015 A1 WO2017200015 A1 WO 2017200015A1 JP 2017018565 W JP2017018565 W JP 2017018565W WO 2017200015 A1 WO2017200015 A1 WO 2017200015A1
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- torque limiter
- mpa
- rotating body
- sheet
- separation mechanism
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
- F16D7/022—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with a helical band or equivalent member co-operating with a cylindrical torque limiting coupling surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
- B65H3/52—Friction retainers acting on under or rear side of article being separated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H49/00—Other gearings
Definitions
- the present invention relates to a torque limiter and a separation mechanism.
- a torque limiter comprising a rotating member and torque generating means for applying a predetermined torque to the rotation of the rotating member, and a torque limiter in which a surface treatment portion having a required friction coefficient is formed on the outer surface of the rotating member is known. (Patent Document 1).
- a rotation transmission device that performs torque transmission between an inner rotator and an outer rotator provided on the same axis so as to be rotatable with respect to each other by a hysteresis torque.
- the inner rotator is made of a semi-rigid magnetic material and rotates outward.
- the body includes a bearing portion that is in sliding contact with the outer peripheral portion of the inner rotating body, and a cylindrical inner peripheral portion that is opposed to the outer peripheral portion of the inner rotating body with a space therebetween.
- Patent Document 2 a rotation transmission device in which a cylindrical permanent magnet having at least its inner peripheral surface magnetized is fixed
- the present invention provides a torque limiter integrally provided with an elastic body that can suppress an increase in the outer diameter change amount, and a separation mechanism that can suppress a decrease in separation performance for a long time using the torque limiter. With the goal.
- a torque limiter In order to solve the above-mentioned problem, 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 facing the cylindrical outer peripheral portion, provided coaxially with the first rotating body and relatively rotatable with respect to each other;
- the ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of dynamic elastic modulus E1 (22 ° C.) and loss tangent tan ⁇ (22 ° C.) fixed to the outer periphery of the second rotating body is 20 MPa or more,
- the invention according to claim 2 is the torque limiter according to claim 1,
- the hysteresis material has circumferential anisotropy, It is characterized by that.
- the separation mechanism according to claim 3 is: A paper feed roller for applying a feeding force to the sheet material to be fed; The torque limiter according to claim 1 or 2, wherein the sheet material other than the uppermost sheet material is separated from the plurality of sheet materials fed in pressure contact with the sheet feeding roller. It is characterized by that.
- the invention according to claim 4 is the separation mechanism according to claim 3,
- the paper feed roller includes the elastic body; It is characterized by that.
- the first aspect of the invention it is possible to suppress an increase in the outer diameter change amount of the torque limiter integrally provided with the elastic body and to suppress the double feeding of the paper in the separation mechanism.
- the second aspect of the present invention it is possible to reduce the initial torque variation and increase the torque limiter size while increasing the hysteresis torque of the torque limiter.
- the life can be extended while the separation mechanism is downsized.
- FIG. 1 It is a longitudinal cross-sectional schematic diagram of a torque limiter.
- A is a schematic diagram which shows the magnetic field processing method of a flat-plate-shaped hysteresis material
- (b) is a schematic diagram which shows the direction of a magnetic field processing
- (c) is a figure which shows the circumferential direction anisotropic hysteresis material.
- (A) is a schematic cross-sectional view of a sheet feeding device including a separation mechanism using a torque limiter
- (b) is a schematic cross-sectional view showing the operation of the separation mechanism when separating a plurality of sheet bundles
- (c) is a simple cross-sectional view.
- FIG. 6 is a diagram showing the relationship between E1 (22 ° C.) / Tan ⁇ (22 ° C.) and the outer diameter change amount of the retard roller in Examples 1 to 4 and Comparative Example 1.
- FIG. 1 is a schematic cross-sectional view of a torque limiter 1 according to the present embodiment
- FIG. 2 (a) is a schematic diagram showing a magnetic field treatment method for a flat plate-like hysteresis material
- (c) is a figure which shows the hysteresis material of circumferential direction anisotropy.
- the torque limiter 1 includes a first rotating body 10 and a second rotating body 20.
- One end side of the first rotating body 10 is rotatably supported on one end side of the second rotating body 20, and the other end side of the first rotating body 10 is connected to the other end side of the second rotating body 20 via the lid body 40. It is rotatably supported.
- the first rotating body 10 includes 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 a synthetic resin material as an example, and specific examples of the synthetic resin material include polyacetal (POM), polypropylene (PP), polycarbonate (PC), and polyamide (PA).
- POM polyacetal
- PP polypropylene
- PC polycarbonate
- PA polyamide
- the permanent magnet 12 is preferably multipolarly magnetized, and specifically, ferrite magnets and rare earth magnets are multipolarly magnetized (14 poles in this embodiment). From the viewpoint of downsizing the torque limiter and increasing the torque, it is preferable to use a rare earth magnet.
- the rare earth magnet include an Nd—Fe—B magnet, an Sm—Fe—N magnet, and an Sm—Co based magnet.
- the torque ripple of the hysteresis torque generated between the first rotating body 10 and the second rotating body 20 can be suppressed by multipolarizing the permanent magnet.
- the second rotating body 20 is an example of a hollow housing 21 and a cylindrical inner peripheral portion fixed to a portion of the inner peripheral surface of the housing 21 facing the permanent magnet 12.
- the hysteresis member 22 and a rubber layer 30 as an example of an elastic body fixed to the outer peripheral surface of the housing 21 are configured.
- Hysteresis material 22 is used to apply a specific magnetic field treatment to a semi-hard magnetic material selected from the group consisting of Fe—Cr—Co, Fe—Mn, Al—Ni, and Al—Ni—Co. It is formed by doing.
- the hot-rolled and cold-rolled semi-hard magnetic material is cut into a flat plate shape (rectangular shape), and as shown in FIG.
- the magnetic field treatment is performed with the magnetic field orientation direction being a fixed direction (see arrow B in the figure).
- the flat semi-rigid magnetic body 220 is bent into a cylindrical shape, and an aging treatment is performed after polishing.
- the hysteresis material 22 has circumferential anisotropy anisotropic in the circumferential direction, the hysteresis torque of the torque limiter 1 is increased and the torque limiter 1 can be further downsized.
- the hysteresis material 22 having circumferential anisotropy has a regular anisotropy obtained by a magnetic field treatment method for the flat semi-rigid magnetic body 220. The variation in the initial torque of the torque limiter 1 is further suppressed.
- the rubber layer 30 has a ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of a dynamic elastic modulus E1 (22 ° C.) and a loss tangent tan ⁇ (22 ° C.) of 20 MPa or more, It consists of a rubber composition having a dynamic elastic modulus E1 (22 ° C.) of 1.0 MPa or more and 10 MPa or less.
- the ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of the dynamic elastic modulus E1 (22 ° C.) and the loss tangent tan ⁇ (22 ° C.) is preferably 30 MPa or more.
- the dynamic elastic modulus E1 (22 ° C.) is a value of the dynamic elastic modulus E1 obtained by temperature dispersion measurement of dynamic viscoelasticity when the measurement temperature is 22 ° C. at room temperature.
- Loss tangent tan ⁇ (22 ° C.) is a value of loss tangent tan ⁇ obtained by dynamic viscoelastic temperature dispersion measurement at a measurement temperature of 22 ° C.
- the torque limiter 1 When the rubber composition of the rubber layer 30 has a ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of the dynamic elastic modulus E1 (22 ° C.) and the loss tangent tan ⁇ (22 ° C.) of 20 MPa or more, the torque limiter 1 is When used in the separation mechanism, an increase in the outer diameter change amount due to wear of the rubber layer 30 of the torque limiter 1 can be suppressed.
- the dynamic elastic modulus E1 (22 ° C.) is 1.0 MPa or more and 10 MPa or less.
- the wear resistance of the rubber layer 30 decreases and the outer diameter change amount increases.
- the dynamic elastic modulus E1 (22 ° C.) is greater than 10 MPa, the initial friction coefficient is low when used in the separation mechanism, and the torque limiter 1 when the sheet P is conveyed to the nip portion N is used. There is a possibility that the forward rotation property is deteriorated and uneven wear or abnormal noise of the rubber layer 30 is generated (see FIG. 3C).
- the friction coefficient between the rubber layer 30 and the paper P is lower than the friction coefficient between the papers and two or more papers P are conveyed to the nip portion N, there is a possibility that double feeding may occur. (See FIG. 3B).
- the loss tangent tan ⁇ (22 ° C.) is preferably 0.01 or more and 0.1 or less.
- the rubber composition contains a small amount of filler and has a high crosslinking density, so that the mechanical strength is reduced and the rubber layer 30 may be destroyed. is there.
- the rubber layer 30 is not particularly limited as long as it is a rubber material. Specifically, it is preferable that the rubber layer 30 contains ethylene propylene copolymer rubber (EPDM) as a main component.
- EPDM ethylene propylene copolymer rubber
- 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, acrylic rubber, and epichlorohydrin rubber. At least one may be included.
- the EPDM when EPDM is used as the rubber material, the EPDM may be either non-oil-extended grade or oil-extended grade, or a mixture of non-oil-extended grade and oil-extended grade.
- the weight of the extending oil in the oil-extended grade EPDM is treated as the weight of the softening agent (oil amount).
- FIG. 3A is a schematic sectional view of a sheet feeding device including a separation mechanism using a torque limiter
- FIG. 3B shows the operation of the separation mechanism when separating a plurality of sheet bundles.
- Cross-sectional schematic diagram, (c) is a schematic cross-sectional view showing the operation of the separation mechanism when transporting a single sheet.
- the sheet feeding device 100 includes a sheet cassette 110 on which sheets P as sheet materials are stacked, a nudger roller 120 that abuts on the leading end side of the upper surface of the sheet P and sends the sheet P from the sheet cassette 110, and a sheet fed from the nudger roller 120. It is configured to include a separation mechanism 50 that conveys (spreads) P one by one.
- a separation mechanism 50 is disposed downstream of the nudger roller 120 in the sheet conveyance direction.
- the separation mechanism 50 includes a feed roller 2 as an example of a paper feed roller, and a torque limiter 1 including a rubber layer 30 as a retard roller disposed in pressure contact with the feed roller 2 below the feed roller 2.
- a nip portion N is formed between the feed roller 2 and the torque limiter 1 so as to sandwich the paper P fed from the paper cassette 110.
- a rubber layer 2b is fixed to the outer peripheral 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 composed of the same rubber composition as the rubber layer 30 of the torque limiter 1. Specifically, the rubber layer 2b has a ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of the dynamic elastic modulus E1 (22 ° C.) and the loss tangent tan ⁇ (22 ° C.) of 20 MPa or more, and the dynamic elastic modulus. It consists of a rubber composition having E1 (22 ° C.) of 1.0 MPa or more and 10 MPa or less.
- the feed roller 2 is a drive roller that is driven to rotate around this axis by a drive source (not shown) with the direction orthogonal to the paper transport direction as the axial direction.
- the feed roller 2 is fed from the paper cassette 110 and is fed to the nip portion.
- the sheet P is conveyed downstream by contacting the upper surface (front surface) of the sheet P conveyed to N and being driven to rotate (see arrow R in the figure).
- the torque limiter 1 is a retard roller that rotates in a reverse direction while being in pressure contact with the feed roller 2 around this axis by a driving source (not shown) with the direction orthogonal to the paper transport direction as the axial direction.
- a conveyance resistance is applied to the sheet P from the lower surface side (back surface side) to suppress the double feeding of the sheet P conveyed by the feed roller 2 (see FIG. 3B). ).
- the torque limiter 1 may be a driven roller that rotates around an axis without being applied with a reverse driving force.
- the torque limiter 1 when the torque limiter 1 functions as a brake, when a plurality of sheets P are overlapped and conveyed to the nip portion N, the sheet P is transferred to the sheet P from the lower surface side (back surface side). Conveyance resistance is applied to suppress double feeding of the paper P conveyed by the feed roller 2.
- the torque limiter 1 that transmits torque by hysteresis torque based on hysteresis loss has higher durability than the spring-type torque limiter, and the durability of the rubber layer 30 fixed to the outer peripheral surface of the housing 21. In the case where the property is low, there is a possibility that the separation performance is lowered and the life of the separation mechanism 50 is shortened despite the transmission torque being maintained.
- the torque limiter 1 that cooperates with the feed roller 2 while being in pressure contact with each other to separate a plurality of sheets P has a dynamic elastic modulus E1 ( 22 ° C.) and loss tangent tan ⁇ (22 ° C.) ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) is 20 MPa or more, and dynamic elastic modulus E1 (22 ° C.) is 1.0 MPa or more and 10 MPa or less.
- a rubber layer 30 made of a certain rubber composition is provided.
- 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 magnetized poles of 14 and a magnetization pitch of 3.22 mm on a hollow shaft 11.
- the second rotating body 20 was fixed by inserting a circumferentially anisotropic hysteresis material having an outer diameter of 15.60 mm and an inner diameter of 14.80 mm into the housing 21. Moreover, the torque limiter of the comparative example using the radial direction anisotropic hysteresis material of outer diameter 15.60mm and inner diameter 14.80mm was also created.
- the torque limiters in the present example and the comparative example are all the same in materials, dimensions, etc. of the constituent members except for the orientation direction of the magnetic field of the hysteresis material.
- Table 1 shows the results of measuring the maximum torque by preparing 15 torque limiters of the example and the comparative example.
- the maximum torque of the torque limiter of the comparative example was a maximum value of 314 gfcm, a minimum value of 278 gfcm, and the variation was 36 gfcm.
- the maximum torque of the torque limiter of the example was a maximum value of 326 gfcm, a minimum value of 312 gfcm, and the variation was 14 gfcm.
- the torque limiter of the example using the circumferential anisotropic hysteresis material has a larger maximum torque and less variation than the torque limiter of the comparative example using the radial anisotropic hysteresis material. It was shown that. Therefore, in the torque limiter of the embodiment using the circumferential anisotropic hysteresis material, the hysteresis torque increases, the torque limiter can be further miniaturized, and the rubber layer 30 is disposed on the outer surface of the torque limiter. This is suitable when a retard roller having a built-in is constructed.
- the rubber composition of the rubber layer 30 of the torque limiter 1 includes a predetermined amount of a polymer component, a crosslinking agent, and a predetermined amount of a softening agent, a filler, other vulcanization accelerators, vulcanization as necessary.
- An unvulcanized rubber composition is obtained by kneading a composition comprising an accelerator and an additive such as an anti-aging agent using a kneader, and this is obtained at 160 ° C., 30 in a predetermined mold. After vulcanization molding under the condition of minutes, secondary vulcanization was further performed under the conditions of 160 ° C. and 60 minutes.
- the molded rubber tube is polished with a cylindrical polishing disk until it has a desired outer diameter, cut to a desired length, and then inserted into the outer peripheral surface of the housing 21 as shown in FIG.
- the torque limiter of the Example provided with the rubber layer 30 and a comparative example was created.
- the viscoelastic property (temperature dispersion) of the punched sample was determined in accordance with JISK6394 (Testing method for dynamic properties of vulcanized rubber and thermoplastic rubber / compact test device). Rheogel E4000FHP) was measured under the following measurement conditions.
- Measurement temperature -84 ° C to 120 ° C Rate of temperature increase: 2 ° C / min Measurement temperature interval: 1 ° C Measurement frequency: 10Hz Initial strain: 1.3 mm Amplitude: 2 ⁇ m Deformation mode: Tensile distance between chucks 10mm Waveform: Sine wave From the measurement results of each of the prepared samples, the value of the dynamic elastic modulus E1 (22 ° C.) and the value of the loss tangent tan ⁇ (22 ° C.) were read.
- Paper test The torque limiter including the rubber layer 30 of the example and the comparative example is mounted on DocuPrint 4050 (manufactured by Fuji Xerox Co., Ltd.), and the paper “Business 4200” (manufactured by Xerox) is made 50000 sheets at a temperature of 10 ° C. and a humidity of 15% RH. I passed through the paper. Measurement was performed at the time of 5000 sheets, 10,000 sheets, 20000 sheets, 30000 sheets, 40000 sheets, and 50000 sheets after the start of the paper passing test, and the outer diameter change [mm] was measured in a temperature of 10 ° C. and humidity of 15% RH. did.
- the “outer diameter change amount” refers to the rubber layer of the initial torque limiter 1 (retard roller) from the outer diameter of the rubber layer 30 of the torque limiter 1 (retard roller) after passing a predetermined number of sheets. It is a value obtained by subtracting the outer diameter of 30. The smaller the absolute value of the outer diameter change amount, the less the rubber layer 30 is scraped and the better the wear resistance.
- Table 2 shows the mechanical properties and viscoelastic properties of the rubber compositions according to Examples 1 to 4 and Comparative Example 1, and the paper passing evaluation of the separation mechanism 50 using the rubber composition.
- FIG. 4 shows the ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) between the dynamic elastic modulus E1 (22 ° C.) and the loss tangent tan ⁇ (22 ° C.) and the torque limiter 1 (retard roller) in Examples 1 to 4 and Comparative Example 1.
- Table 3 shows the relationship between the viscoelastic characteristics and the outer diameter change amount in Comparative Examples 1 to 3.
- Table 4 shows the blending 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 are mainly composed of ethylene propylene copolymer rubber (EPDM).
- polymer component indicates the polymer component in the rubber composition.
- Oil component refers to an oil component occupying in the rubber composition, and includes an extending oil in the polymer component and an oil used as a softening agent.
- Oil components refers to components other than the polymer component and oil component in the rubber composition, and includes a crosslinking agent (vulcanizing agent), a vulcanization accelerator, a processing aid, a vulcanization acceleration aid, a filler, Includes reinforcing fillers.
- the ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of the dynamic elastic modulus E1 (22 ° C.) and the loss tangent tan ⁇ (22 ° C.) is 20 [ [MPa] or more, it was found that the amount of change in the outer diameter of the rubber layer 30 as the retard roller was suppressed, and the life as the separation mechanism 50 was long.
- the dynamic elastic modulus E1 (22 ° C.) relates to the deformation amount of the feed roller 2 of the separation mechanism 50 and the rubber layer 30 of the torque limiter 1, and when the dynamic elastic modulus E1 (22 ° C.) is high, the feed roller 2.
- the amount of deformation of the rubber layer 30 of the torque limiter 1 can be suppressed, so that slip relative to the paper P can be reduced and wear resistance can be improved.
- the loss tangent tan ⁇ (22 ° C.) for example, by making the loss tangent tan ⁇ (22 ° C.) less than 0.1, between the polymer main chains generated during deformation of the rubber layer 30, the polymer main chain and the filler Meanwhile, the friction (loss) between the fillers can be reduced.
- a rubber composition that increases the ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of the dynamic elastic modulus E1 (22 ° C.) and the loss tangent tan ⁇ (22 ° C.) can be used as a retard roller. It is inferred that the wearability could be improved.
- Comparative Example 2 is a case where the ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of the dynamic elastic modulus E1 (22 ° C.) and the loss tangent tan ⁇ (22 ° C.) exceeds 20 MPa. Even if it exists, compared with an Example, the absolute value of the outer diameter change amount of a retard roller may be large.
- Comparative Example 3 double feeding occurred from the initial stage of paper feeding, and it could not be used as a retard roller.
- Table 3 since the dynamic elastic modulus E1 (22 ° C.) of Comparative Example 3 is as large as 26.62 [MPa] as shown in Table 3, the nip amount between the paper P and the retard roller is small. It is presumed that due to the paper, the friction coefficient between the retard roller and the paper P is lower than the friction coefficient between the papers, and double feeding has occurred.
- the rubber composition constituting the rubber layer 30 is not limited to EPDM or the like, but the ratio E1 (22 ° C.) / Tan ⁇ (22 ° C.) of the dynamic elastic modulus E1 (22 ° C.) and the loss tangent tan ⁇ (22 ° C.). May be urethane rubber having a dynamic elastic modulus E1 (22 ° C.) of 1.0 MPa or more and 10 MPa or less.
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Abstract
Description
永久磁石からなる円筒状外周部を有する第1回転体と、
前記円筒状外周部に対向するヒステリシス材からなる円筒状内周部を有し、前記第1回転体と同軸状で互いに対して相対的に回転可能に設けられた第2回転体と、
前記第2回転体の外周部に固定された、動的弾性率E1(22℃)と損失正接tanδ(22℃)の比E1(22℃)/tanδ(22℃)が20MPa以上であり、前記動的弾性率E1(22℃)が1.0MPa以上10MPa以下である弾性体と、を備えた、
ことを特徴とする。
前記ヒステリシス材が、周方向異方性を有する、
ことを特徴とする。
送り出されるシート材に給送力を付与する給紙ローラと、
前記給紙ローラに圧接して送り出された複数枚のシート材のうち最上位の前記シート材以外の前記シート材を分離する請求項1又は2に記載のトルクリミッタと、を備えた、
ことを特徴とする。
前記給紙ローラが前記弾性体を備えた、
ことを特徴とする。
図1は本実施形態に係るトルクリミッタ1の断面模式図、図2(a)は平板状のヒステリシス材の磁場処理方法を示す模式図、(b)は磁場処理の方向を示す模式図、(c)は周方向異方性のヒステリシス材を示す図である。
第1回転体10は、中空状のシャフト11と、シャフト11の外周面に円筒状外周部の一例としての永久磁石12が固着されて構成されている。
第2回転体20は、中空状のハウジング21と、ハウジング21の内周面の永久磁石12に対向する部分に固着された円筒状内周部の一例としてのヒステリシス材22と、ハウジング21の外周面に固着された弾性体の一例としてのゴム層30から構成されている。
ヒステリシス材22は、Fe-Cr-Co、Fe-Mn、Al-Ni、Al-Ni-Coからなる群から選択される半硬質磁性体に特定の磁場処理を行うことにより形成される。
ゴム層30は、動的弾性率E1(22℃)と損失正接tanδ(22℃)の比E1(22℃)/tanδ(22℃)が20MPa以上であり、動的弾性率E1(22℃)が1.0MPa以上10MPa以下であるゴム組成物からなる。また、動的弾性率E1(22℃)と損失正接tanδ(22℃)の比E1(22℃)/tanδ(22℃)が30MPa以上であることが好ましい。
図3(a)はトルクリミッタを用いた分離機構を含む給紙装置の断面模式図、(b)は複数枚の用紙束を分離するときの分離機構の動作を示す断面模式図、(c)は単枚の用紙を搬送するときの分離機構の動作を示す断面模式図である。
第1回転体10は、中空状のシャフト11に外径14.37mm、内径11.47mm、着磁極数14極、着磁ピッチ3.22mmの永久磁石12を挿入して固着した。
表1は、実施例及び比較例のトルクリミッタをそれぞれ15個作成して最大トルクを測定した結果を示している。
本実施形態に係るトルクリミッタ1のゴム層30のゴム組成物は、所定量のポリマー成分と、架橋剤と、必要に応じて所定量の軟化剤、充填剤、その他加硫促進剤、加硫促進助剤、および老化防止剤等の添加剤と、からなる配合物を混練機を用いて混練して未加硫のゴム組成物を得て、これを所定の金型内で160℃、30分間の条件で加硫成形してから、さらに160℃、60分間の条件で2次加硫した。
混練機を用いて所定量のポリマー成分と、架橋剤と、必要に応じて所定量の軟化剤、充填剤、その他加硫促進剤、加硫促進助剤、および老化防止剤等の添加剤とからなる配合物を混練し、金型を用いて、160℃、30分間の条件で加硫成形し、さらに160℃、60分間の条件で2次加硫した。これにより、シート状のゴム架橋物を得た。このシートから、幅5mm×長さ20mm×厚さ2mmの短冊状のサンプルを打ち抜いて粘弾性特性測定用のゴム組成物とした。
測定温度の昇温速度:2℃/min
測定温度間隔:1℃
測定周波数:10Hz
初期歪み:1.3mm
振幅:2μm
変形モード:引っ張り
チャック間距離10mm
波形:正弦波
作成したそれぞれのサンプルの測定結果から、動的弾性率E1(22℃)の値及び損失正接tanδ(22℃)の値を読み取った。
実施例および比較例のゴム層30を備えたトルクリミッタをDocuPrint4050(富士ゼロックス社製)に装着し、用紙「Business4200」(Xerox社製)を温度10℃、湿度15%RH環境下で50000枚に亘って通紙した。測定は、通紙試験開始後、5000枚、10000枚、20000枚、30000枚、40000枚、50000枚の時点で、外径変化量[mm]を温度10℃、湿度15%RH環境下で測定した。
表2は、実施例1~4及び比較例1に係るゴム組成物の機械物性、粘弾性特性、及び係るゴム組成物を用いた分離機構50の通紙評価を示している。図4は実施例1~4及び比較例1における動的弾性率E1(22℃)と損失正接tanδ(22℃)の比E1(22℃)/tanδ(22℃)とトルクリミッタ1(リタードローラ)のゴム層30の外径変化量との関係を示している。表3は、比較例1~3における粘弾性特性と外径変化量との関係を示している。
10・・・第1回転体
11・・・シャフト
12・・・永久磁石
20・・・第2回転体
21・・・ハウジング
22・・・ヒステリシス材
30・・・ゴム層
40・・・蓋体
50・・・分離機構
1・・・リタードローラ(トルクリミッタ)
2・・・フィードローラ
100・・・給紙装置
110・・・用紙カセット
120・・・ナジャーローラ
Claims (4)
- 永久磁石からなる円筒状外周部を有する第1回転体と、
前記円筒状外周部に対向するヒステリシス材からなる円筒状内周部を有し、前記第1回転体と同軸状で互いに対して相対的に回転可能に設けられた第2回転体と、
前記第2回転体の外周部に固定された弾性体とを備え、
前記弾性体の22℃の温度における動的弾性率をE1,損失正接をtanδとすると、前記弾性体は、以下の関係式を満足する、トルクリミッタ。
E1/tanδ ≧ 20MPa
1.0MPa ≦ E1 ≦ 10MPa - 前記ヒステリシス材が、周方向異方性を有する、
ことを特徴とする請求項1に記載のトルクリミッタ。 - 送り出されるシート材に給送力を付与する給紙ローラと、
前記給紙ローラに圧接して送り出された複数枚のシート材のうち最上位の前記シート材以外の前記シート材を分離する請求項1又は2に記載のトルクリミッタと、を備えた、
ことを特徴とする分離機構。 - 前記給紙ローラが前記弾性体を備えた、
ことを特徴とする請求項3に記載の分離機構。
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US20060219496A1 (en) * | 2005-03-30 | 2006-10-05 | Dimig Steven J | Residual magnetic devices and methods |
JP2009190888A (ja) | 2008-02-18 | 2009-08-27 | Ntn Corp | トルクリミッタ |
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JP2001041257A (ja) * | 1999-07-28 | 2001-02-13 | Sumitomo Special Metals Co Ltd | トルクリミッタ |
JP2004191638A (ja) * | 2002-12-11 | 2004-07-08 | Bridgestone Corp | トナー担持体及び画像形成装置 |
JP2006316861A (ja) * | 2005-05-11 | 2006-11-24 | Yamauchi Corp | トルクリミッタ |
JP2007002015A (ja) * | 2005-06-21 | 2007-01-11 | Yamauchi Corp | 紙送りロール用ゴム架橋物およびこれを用いた紙送りロール |
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