WO2014192438A1 - 金属ベルトおよび該金属ベルトを備える駆動機構 - Google Patents
金属ベルトおよび該金属ベルトを備える駆動機構 Download PDFInfo
- Publication number
- WO2014192438A1 WO2014192438A1 PCT/JP2014/060399 JP2014060399W WO2014192438A1 WO 2014192438 A1 WO2014192438 A1 WO 2014192438A1 JP 2014060399 W JP2014060399 W JP 2014060399W WO 2014192438 A1 WO2014192438 A1 WO 2014192438A1
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- WIPO (PCT)
- Prior art keywords
- metal belt
- belt
- state
- cross
- drive mechanism
- Prior art date
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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
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G1/00—Driving-belts
- F16G1/20—Driving-belts made of a single metal strip
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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
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
- G03G15/757—Drive mechanisms for photosensitive medium, e.g. gears
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1642—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements for connecting the different parts of the apparatus
- G03G21/1647—Mechanical connection means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
- G03G21/1671—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus for the photosensitive element
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
- G03G21/168—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus for the transfer unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/14—Making other particular articles belts, e.g. machine-gun belts
Definitions
- the present invention relates to a metal belt and a drive mechanism including the metal belt.
- a gear mechanism is widely used as a drive mechanism for an image forming unit such as a photosensitive drum and a transfer roller.
- a gear mechanism made of a resin gear is inexpensive.
- the gear mechanism tends to generate banding and jitter in the output image due to the influence of rigidity reduction and meshing vibration. Therefore, there is a method using a traction drive having high rigidity and no meshing as a drive mechanism. However, this method is very expensive and is not suitable for the development of cost competitive products.
- a metal belt reduction drive system in which a metal belt is driven between two pulleys is being studied.
- a pair of pulleys (a driven pulley and a drive pulley) having different diameters are used to achieve a predetermined reduction ratio.
- the metal belt spanned between these pulleys has a linear shape between the pulleys and a curved shape around the pulleys. Therefore, the conventional metal belt has a problem that metal fatigue is caused by such repeated shape change, and durability against stress (tensile stress, bending stress) applied from the pulley to the metal belt is lowered and breaks.
- a solution treatment is performed on a metal belt, and then plastic deformation is performed, and an aging treatment is performed to positively remove residual stress and impart resistance to tensile stress.
- Patent Document 1 has been proposed.
- An object of the present invention is to provide a metal belt imparted with high durability against tensile stress by positively retaining compressive stress and a drive mechanism including the metal belt.
- the metal belt according to one aspect of the present invention is an endless belt formed by a belt-like body.
- the metal belt has a belt overlapping portion in which at least two ring pieces formed by deformation due to the compressive stress inherent in the belt in a natural state where no external force is applied overlap in the ring radial direction.
- the metal belt has a cross-sectional shape that is convex outward in the radial direction in a cross-sectional view orthogonal to the circumferential direction of the belt in the first state that is annularly expanded from the natural state.
- a drive mechanism includes a metal belt and a pulley on which the metal belt is bridged, and the metal belt has the above-described configuration.
- FIG. 1 is a schematic sectional view of a printer according to an embodiment of the present invention.
- FIG. 2 is a schematic perspective view of a drive mechanism according to an embodiment of the present invention.
- FIG. 3A is a schematic perspective view illustrating the shape of a driven pulley.
- FIG. 3B is an axial sectional view thereof.
- FIG. 4 is a partial sectional view of a metal belt in a natural state.
- FIG. 5 is a partially broken perspective view of the metal belt in the front state.
- 6 is a cross-sectional view taken along line VI-VI in FIG.
- FIG. 7 is a cross-sectional view in the width direction in which a part of the metal belt stretched around the driven pulley is enlarged.
- FIG. 1 is a schematic sectional view of a printer according to an embodiment of the present invention.
- FIG. 2 is a schematic perspective view of a drive mechanism according to an embodiment of the present invention.
- FIG. 3A is a schematic perspective view illustrating the shape
- FIG. 8 is a partially broken perspective view of the metal belt in the back state.
- 9 is a cross-sectional view taken along line IX-IX in FIG.
- FIG. 10 is a cross-sectional view in the width direction in which a part of the metal belt in the back state stretched around the driven pulley is enlarged.
- FIG. 11A is a schematic diagram illustrating a method for manufacturing a metal belt.
- FIG. 11B is a schematic view illustrating a method for manufacturing a metal belt.
- FIG. 11C is a schematic diagram illustrating a method for manufacturing a metal belt.
- FIG. 12A is a schematic perspective view of a driven pulley. 12B is an axial cross-sectional view of FIG. 12A.
- FIG. 13 is a cross-sectional view in the width direction in which a part of a front-surface metal belt spanned by a driven pulley is enlarged.
- FIG. 1 is a schematic diagram of a printer 100 according to an embodiment of the present invention.
- the image forming apparatus is not limited to a printer, and may be a copier, a facsimile machine, a multifunction machine, or the like.
- the printer 100 mainly includes a box-shaped housing 101 and an image forming unit 110, an optical scanning device 120, a paper feeding cassette 130, and a paper feeding cassette 140 accommodated in the housing 101.
- the paper feed cassette 130 and the paper feed cassette 140 are detachably attached to the lower part of the printer 100.
- the image forming unit 110 performs processing for forming a toner image on the sheet P, and includes a charging device 111, a photosensitive drum 112, a developing device 113, a transfer roller 114, a cleaning device 115, and a fixing unit 116.
- the photosensitive drum 112 is a cylindrical member, and an electrostatic latent image and a toner image are formed on the peripheral surface thereof.
- the photosensitive drum 112 is rotated in the direction of arrow A in response to a driving force from a motor (not shown).
- the charging device 111 charges the surface of the photosensitive drum 112 substantially uniformly.
- the developing device 113 supplies toner to the peripheral surface of the photosensitive drum 112 on which the electrostatic latent image is formed to form a toner image.
- the developing device 113 includes a developing roller that carries toner and a screw (not shown) that stirs and conveys the toner.
- the toner image formed on the photosensitive drum 112 is transferred to the sheet P that is fed from the paper feed cassette 130 or the paper feed cassette 140 and conveyed to the conveyance path 150.
- the developing device 113 is supplied with toner from a toner container (not shown).
- the transfer roller 114 is disposed opposite to the side of the photosensitive drum 112, and a transfer nip portion is formed by both.
- the transfer roller 114 is made of a conductive rubber material or the like and is given a transfer bias, and transfers the toner image formed on the photosensitive drum 112 onto the sheet P.
- the cleaning device 115 cleans the peripheral surface of the photosensitive drum 112 after the toner image is transferred.
- the fixing unit 116 includes a fixing roller 116a having a built-in heater, and a pressure roller 116b provided at a position facing the fixing roller 116a.
- the fixing unit 116 fixes the toner image transferred to the sheet P to the sheet P by conveying the sheet P on which the toner image is formed while being heated by the fixing roller 116a.
- the optical scanning device 120 irradiates the peripheral surface of the photosensitive drum 112 that is substantially uniformly charged by the charging device 111 with laser light corresponding to image data input from an external device such as a personal computer. An electrostatic latent image is formed.
- the drive mechanism of the present invention is used for a part that is rotationally driven based on a metal belt reduction drive system among the above parts provided in the printer 100, for example.
- the part driven by the drive mechanism is not particularly limited.
- the photosensitive drum 112, the developing roller provided in the developing device 113, the transfer roller 114, the fixing roller 116a or the pressure roller 116b provided in the fixing unit 116, and the conveyance path 150 are provided. Examples thereof include a pair of paper feed rollers 151a, a pair of paper feed rollers 151b, a pair of transport rollers 152a, a pair of transport rollers 152b, a pair of registration rollers 153, a pickup roller 156, and a pickup roller 157. Details of the drive mechanism will be described later.
- the peripheral surface of the photosensitive drum 112 is charged substantially uniformly by the charging device 111.
- the peripheral surface of the charged photosensitive drum 112 is exposed by laser light emitted from the optical scanning device 120, and an electrostatic latent image of an image formed on the sheet P is formed.
- the electrostatic latent image is made visible as a toner image by supplying toner from the developing device 113 to the peripheral surface of the photosensitive drum 112.
- the sheet P is fed out to the conveyance path 150 by the pickup roller 156a (or pickup roller 156b), and the paper feed roller pair 151a (or paper feed roller pair 151b) and It is conveyed by the conveyance roller pair 152a (or the conveyance roller pair 152b). Thereafter, the sheet P is temporarily stopped by the registration roller pair 153 and is sent to a transfer nip portion between the transfer roller 114 and the photosensitive drum 112 at a predetermined timing. The toner image is transferred to the sheet P when the sheet P passes through the transfer nip portion. After this transfer operation is performed, the sheet P is conveyed to the fixing unit 116 and the toner image is fixed to the sheet P. Thereafter, the sheet P is discharged to the paper discharge tray 160 by the conveying roller pair 154 and the discharge roller pair 155.
- FIG. 2 is a schematic view of a drive mechanism 200 according to an embodiment of the present invention.
- the drive mechanism 200 includes a metal belt 300 and a pair of pulleys (a driven pulley 400 and a drive pulley 500) around which the metal belt 300 is bridged.
- the drive mechanism 200 is a mechanism that rotationally drives each part included in the above-described printer 100 (see FIG. 1) based on a metal belt reduction drive system, for example.
- a metal belt reduction drive system for example.
- the pair of pulleys includes a driven pulley 400 and a driving pulley 500.
- FIG. 3A is a schematic perspective view for explaining the shape of the driven pulley 400
- FIG. 3B is a cross-sectional view of the driven pulley 400 in the width direction (direction perpendicular to the circumferential direction).
- the driven pulley 400 has an upper surface 410, a lower surface 420, and a side peripheral surface 430, and has a convex cross-sectional shape outward in the radial direction in a cross-sectional view orthogonal to the circumferential direction (so-called crown shape).
- the upper surface 410 and the lower surface 420 are both flat and circular, and the side peripheral surface 430 has a curved shape that bulges outward in the radial direction.
- the curvature is such that the central region 431 in the width direction of the side peripheral surface 430 bulges most outward in the radial direction, and the peripheral region connected to the upper surface 410 and the lower surface 420 from the central region 431 (upper peripheral region 432 and The bulge gradually decreases toward the lower peripheral edge region 433).
- the terms “upper surface 410” and “lower surface 420” defined in the present embodiment are defined for the purpose of determining the direction for the sake of clarity of description, for example, installation of pulleys. It does not limit the direction.
- the driven pulley 400 with the side peripheral surface 430 bulging comes into contact with the inner side in the radial direction of the metal belt 300b when a metal belt 300b (see FIG. 5) in a front state, which will be described later, is bridged.
- the driven pulley 400 is attached to a first output shaft 440 that extends vertically through the centers of the upper surface 410 and the lower surface 420.
- the first output shaft 440 is connected to the rotation shaft of the photosensitive drum 112 (see FIG. 1).
- the driven pulley 400 rotates with the first output shaft 440.
- the drive pulley 500 has an upper surface 510, a lower surface 520, and a side peripheral surface 530, and has a cross-sectional shape that protrudes radially outward in a cross-sectional view orthogonal to the circumferential direction. (So-called crown shape). More specifically, the upper surface 510 and the lower surface 520 are both flat and circular, and the side peripheral surface 530 has a curved shape that bulges outward in the radial direction. In this way, the drive pulley 500 in which the side peripheral surface 530 bulges complementarily contacts the inner side in the radial direction of the metal belt 300b when a metal belt 300b (see FIG.
- the drive pulley 500 extends vertically through the centers of the upper surface 510 and the lower surface 520, and is attached to a second output shaft 540 that is rotationally driven by a motor (not shown). The drive pulley 500 rotates with the second output shaft 540.
- the positions of the driven pulley 400 and the drive pulley 500 are appropriately fixed by a holding member (not shown).
- the diameters of the driven pulley 400 and the drive pulley 500 are not particularly limited, and are appropriately set to achieve a desired reduction ratio. In general, the diameter of the driven pulley 400 is larger than the diameter of the drive pulley 500.
- the diameter of the driven pulley 400 relative to the diameter of the drive pulley 500 is set to 1: 2 to 1:10 when used as a drive mechanism of the photosensitive drum 112, for example.
- the metal belt 300 is an endless belt formed of a metal strip. By using a belt made of metal, a drive mechanism having higher rigidity than that in the case of using a conventional resin gear and suppressing meshing can be obtained.
- the metal belt 300 is used by being laid over a driven pulley 400 and a drive pulley 500 in a state where the metal belt 300 is annularly expanded (see FIG. 2).
- the circumference of the metal belt 300 is not particularly limited, and the circumference of the metal belt that is usually used in a general-purpose drive mechanism can be adopted. Examples of such a perimeter include a range of 180 to 360 mm.
- the width of the metal belt 300 is not particularly limited, and the width of the metal belt normally used in a general-purpose drive mechanism can be adopted. Such a width is, for example, 5 to 10 mm.
- the thickness of the metal belt 300 is not particularly limited, but is preferably 30 ⁇ m or less, and more preferably 20 to 30 ⁇ m.
- the thickness is 30 ⁇ m or less
- the bending stress applied to the metal belt 300 is reduced when the metal belt 300 is stretched over the driven pulley 400 and the drive pulley 500 and is largely bent around the pulleys. Therefore, the metal belt 300 is less likely to break from the peripheral region, and has relatively high durability with respect to the thick belt.
- the material of the metal belt 300 is not particularly limited, but is preferably made of a nonmagnetic metal.
- a non-magnetic metal As a material, the metal belt 300 is less likely to generate rust. For this reason, the durability of the metal belt 300 against tensile stress is unlikely to further decrease.
- the nonmagnetic metal include aluminum, copper, silver, and austenitic stainless steel. Among these, austenitic stainless steel is preferable as the nonmagnetic metal because it has high toughness.
- the metal belt 300 has a compressive stress.
- the manufacturing method of the metal belt 300 for making compressive stress and this compressive stress inherent will be mentioned later.
- the front and back of the metal belt 300 are defined as follows. That is, the metal belt in a state where the external force is applied to the metal belt (the metal belt 300a) without applying an external force and is expanded in an annular shape is a surface state (a first state in which the natural belt is expanded in an annular shape, see FIG. 5).
- the metal belt (metal belt 300b) is a metal belt in a state in which the front and back sides are reversed (see FIG. 8), and a metal in the back state (second state in which the front and back sides are reversed from the first state). This is referred to as a belt (metal belt 300c).
- each state that the metal belt 300 can take will be described.
- FIG. 4 is a partial cross-sectional view of the metal belt 300a in a natural state where no external force is applied.
- Two ring pieces (a first ring piece 310a and a second ring piece 320a) are formed on the metal belt 300a.
- the first ring piece 310a and the second ring piece 320a are belt overlapping portions that overlap each other in the radial direction of the ring pieces (at least two ring pieces formed by deformation due to an inherent compressive stress in a natural state where no external force is applied). However, it has a belt overlapping portion overlapping in the ring radial direction.
- the belt overlapping portion is a part of the first ring piece 310a and one of the second ring pieces 320a existing on an arbitrary straight line L extending from the inside in the radial direction of the metal belt 300a to the outside.
- the straight line L there are a point P1 that is a part of the first ring piece 310a and a point P2 that is a part of the second ring piece 320a.
- the first ring piece 310a and the second ring piece 320a overlap at least in part to form a belt overlapping portion.
- the metal belt 300a has an intersecting portion 330a where the first ring piece 310a and the second ring piece 320a intersect.
- the second ring piece 320a has a twisted portion 340a in which the front and back of the belt are twisted. Since the metal belt 300a itself is endless, the first ring piece 310a and the second ring piece 320a are continuous. Therefore, the boundary between the first ring piece 310a and the second ring piece 320a is not clear.
- the ring piece formed on the outer side in the radial direction with the intersecting portion 330a as a boundary is referred to as a first ring piece 310a
- the ring piece formed on the inner side in the radial direction is referred to as a second ring piece 320a.
- the first ring piece 310a and the second ring piece 320a are portions formed by spontaneous deformation of the belt itself due to the compressive stress inherent in the metal belt 300b in the front state described later.
- the twisted portion 340a is formed on either the first ring piece 310a or the second ring piece 320a when deforming from the surface state to the natural state.
- the length in the circumferential direction of the twisted portion 340a is not particularly limited, and becomes an appropriate length depending on the width of the metal belt 300a and various physical properties (rigidity, etc.).
- FIG. 5 is a partially broken perspective view of the metal belt 300b in the front state.
- FIG. 6 is a cross-sectional view (cross-sectional view in the width direction) taken along the line VI-VI in FIG.
- the metal belt 300b in the front state is an annular shape obtained by applying an external force to the metal belt 300a in the natural state (see FIG. 4).
- the upper peripheral region 310b close to the upper surface of the pulley
- the lower peripheral region 320b close to the lower surface of the pulley
- the upper peripheral region 310b
- a central region 330b located between the peripheral region 320b.
- the metal belt 300b has a cross-sectional shape that is convex outward in the radial direction in a cross-sectional view orthogonal to the circumferential direction of the metal belt 300b, and the center region 330b has a curved shape that bulges most outward in the radial direction. is there.
- a curved surface 340b is formed on the inner side in the radial direction of the metal belt 300b so that the side peripheral surfaces of the pulleys are in complementary contact with each other.
- Compressive stress inherent in the metal belt 300b in the surface state generally acts toward the inside in the radial direction of the metal belt 300b in the entire metal belt 300b. Further, the compressive stress inherent in the metal belt 300b is larger than the force (holding force in the front state) at which the metal belt 300b maintains its shape. Therefore, when the external force is removed from the metal belt 300b in the front state, the compressive stress is wound and deformed so as to twist the metal belt 300b.
- the deformed metal belt 300b is formed with the first ring piece 310a, the second ring piece 320a, and a belt overlapping portion in which these are overlapped (see FIG. 4).
- the compressive stress is attenuated, and balances with the force (the holding force in the natural state) that the metal belt 300a in the natural state maintains its shape.
- the shape of the metal belt 300a is maintained in a natural state.
- FIG. 7 is a cross-sectional view in the width direction in which a part of the metal belt 300b laid over the driven pulley 400 is enlarged.
- the metal belt 300b mainly has a central region 330b in contact with the side peripheral surface 430 of the driven pulley 400 (the metal belt laid over the pulley in the first stress portion). ).
- the compressive stress inherent in the metal belt 300b in the surface state generally acts toward the inside in the radial direction of the metal belt 300b in the entire metal belt 300b.
- the stress applied from the driven pulley 400 to the metal belt 300b is the center region 330b of the metal belt 300b that contacts the center region 431 of the side peripheral surface 430 of the driven pulley 400 (the first stress is inherent and the width of the metal belt 300b). It is easy to be directly applied to the first stress portion formed in the central region in the direction), and the upper peripheral region 310b and the lower peripheral region 320b of the metal belt 300b (the second stress smaller than the first stress is inherent) It is difficult to apply to the second stress portion formed in the peripheral region of the metal belt. Therefore, the metal belt 300b hardly breaks from the upper peripheral region 310b and the lower peripheral region 320b, and has high durability.
- FIG. 8 is a partially broken perspective view of the metal belt 300c in the back state.
- 9 is a cross-sectional view (cross-sectional view in the width direction) taken along the line IX-IX in FIG.
- the back-side metal belt 300c is obtained by inverting the front and back of the front-side metal belt 300b (see FIG. 5). Since the metal belt 300 of this embodiment can be used not only in the front state but also in the back state, the yield is improved and the cost is reduced.
- a central region 330c is located between the upper peripheral region 310c and the lower peripheral region 320c.
- the metal belt 300c has a cross-sectional shape that is convex inward in the radial direction in a cross-sectional view orthogonal to the circumferential direction of the metal belt 300c, and has a curved shape in which the central region 330c bulges most inward in the radial direction. is there. Since the metal belt 300c in the back state has such a shape, it is easily laid over the driven pulley 400. Therefore, convenience during production is improved.
- FIG. 10 is a cross-sectional view in the width direction in which a part of the back-side metal belt 300c spanned by the driven pulley 400 is enlarged.
- the central region 330c is convex inward in the radial direction, so that the central region 330c mainly contacts the side peripheral surface 430 of the driven pulley 400.
- the central region 330 c of the metal belt 300 c is deformed along the curved shape of the driven pulley 400 by contact with the central region 431 of the driven pulley 400.
- the stress applied from the driven pulley 400 to the metal belt 300c is likely to be applied to the central region 330c of the metal belt 300c, and is difficult to be applied to the upper peripheral region 310c and the lower peripheral region 320c.
- the metal belt 300c is not easily broken from the peripheral region and has high durability. Even if the upper peripheral region 310c and the lower peripheral region 320c are damaged, the damage is difficult to expand.
- the relationship between the stress generated between the drive pulley (not shown) and the back-side metal belt 300c spanned over the drive pulley is the stress generated between the driven pulley 400 and the back-side metal belt 300c. Since it is the same as the relationship, the description is omitted.
- the metal belt 300 can be bridged between the driven pulley 400 and the drive pulley 500 on both the front and back surfaces (see FIG. 2).
- the drive pulley 500 connected to the second output shaft 540 rotates.
- the metal belt 300 travels as the drive pulley 500 rotates.
- the driven pulley 400 rotates, and the first output shaft 440 connected to the driven pulley 400 rotates.
- the photosensitive drum 112 connected to the first output shaft 440 rotates. Since the printer 100 (see FIG. 1) including the drive mechanism 200 uses the metal belt 300 having high durability, the printer 100 is low in cost and suitable for long-term use.
- FIG. 11A to 11C are schematic views for explaining a method of manufacturing the metal belt 300, FIG. 11A shows a belt raw material 600 being processed, FIG. 11B shows a metal belt 300d before being cut, and FIG. The obtained metal belt 300 is shown.
- the metal belt 300 can be manufactured, for example, by subjecting the belt raw material 600 before processing to rotational plastic processing.
- a method of manufacturing the metal belt 300 by performing spinning processing (an example of rotational plastic processing) on the tubular belt raw material 600 will be exemplified.
- a cylindrical belt raw material 600 (material: SUS304, thickness of about 30 mm) as a material of the metal belt 300 is prepared.
- the belt raw material 600 is attached to a cylindrical rotary mold (mandrel 700) so as to penetrate the cylinder.
- the mandrel 700 is made of tool steel such as carbon steel and has a higher hardness than the belt raw material 600.
- the belt raw material 600 is rotated together with the mandrel 700, and the roller 800 is pressed against the outer peripheral surface of the belt raw material 600 (see FIG. 11A).
- the roller 800 is made of tool steel such as die steel and has higher hardness than the belt raw material 600.
- the number of rotations of the mandrel 700 is not particularly limited, and can be, for example, 200 rotations / minute.
- the roller 800 is repeatedly moved mainly in a direction along the rotation axis direction of the mandrel 700, and presses and stretches the belt raw material 600 against the mandrel 700. At this time, in the belt raw material 600, the amount of stretching by the roller 800 is adjusted, so that compressive stress remains in the obtained metal belt 300. Examples of such stretching amount include 0.5 to 1 (unit: mm).
- the belt raw material 600 is formed into a tubular shape having a thickness of 30 ⁇ m or less, for example (see FIG. 11B).
- the processed belt raw material (metal belt 300d) is cut into a metal belt 300 by a desired cutting device in a direction perpendicular to the rotation axis at a cutting position A3 so as to have a predetermined width (FIG. 11C). ).
- the number of rollers 800 is not particularly limited, and may be one or more.
- the diameter of the mandrel 700 is not particularly limited, and is appropriately selected according to the intended diameter of the metal belt 300.
- the shape of the belt raw material 600 is not limited to a tubular shape, and may be a flat plate shape.
- the plate-shaped belt raw material is preliminarily centered or discarded in the vicinity of the center of the flat plate, and the vicinity of the center is closely fixed to the tip of the mandrel using an oscop (fixing jig). Thereafter, the flat belt raw material is pressed against the mandrel by a roller and stretched in the same manner as described above. The stretched belt raw material is cut to have a predetermined width by a cutting device in the same manner as described above, so that a metal belt 300 is obtained.
- FIG. 12A is a schematic perspective view of the driven pulley 400a
- FIG. 12B is a cross-sectional view in the width direction in which a part of the driven pulley 400a is enlarged
- FIG. 13 is a cross-sectional view in the width direction in which a part of the front-side metal belt 300b spanned by the driven pulley 400a is enlarged.
- the drive mechanism of the present embodiment is the first implementation except that the shape of the side peripheral surface 430a of the driven pulley 400a is different from the shape of the side peripheral surface 430 (see FIG. 3B) of the driven pulley 400 in the first embodiment. It is the structure similar to the drive mechanism 200 in a form. Therefore, the overlapping description is omitted as appropriate.
- the driven pulley 400a is formed by chamfering an upper side chamfer region 434a formed by chamfering an upper peripheral region 432a connected to the upper surface 410a and a lower peripheral region 433a connected to the lower surface 420a. And a lower side chamfered region 435a.
- the degree of chamfering is appropriately set based on the physical properties (for example, the degree of bending) of the metal belt 300b in the front state and the width of the driven pulley 400a. For example, as shown in FIG. 12B, the angle ⁇ 1 at which the upper side chamfered region 434a is formed with respect to the upper surface 410a can be set to 30 to 45 °.
- the angle ⁇ 2 at which the lower side chamfered region 435a is formed with respect to the lower surface 420a can be set to 35 to 45 °.
- the angle ⁇ 1 and the angle ⁇ 2 may be the same or different. When the angle ⁇ 1 and the angle ⁇ 2 are within the above ranges, an appropriate stress can be applied to the central region 330b of the metal belt 300b that is bridged.
- the driven pulley 400a subjected to the chamfering process has a center region 431a of the driven pulley 400a that has the metal belt 300b in the front state when the metal belt 300b in the front state is bridged. It is easier to come into contact with the inner side in the radial direction of the central region 330b, and it is more difficult to make contact with the upper peripheral region 310b and lower peripheral region 320b. Therefore, the stress applied from the driven pulley 400a to the metal belt 300b is particularly likely to be applied to the central region 330b of the metal belt 300b and is not easily applied to the peripheral region. As a result, the metal belt 300b is less likely to break from the upper peripheral region 432a and the lower peripheral region 433a, and has higher durability.
- both the driven pulley and the drive pulley have a convex cross-sectional shape radially outward in a cross-sectional view orthogonal to the circumferential direction.
- the drive mechanism of the present invention may have only one of the pulleys (for example, a driven pulley) as the above shape, and the other pulley (for example, the drive pulley) has a substantially cylindrical shape, and has a flat side surface. It is good.
- both the driven pulley and the drive pulley may be substantially cylindrical.
- the drive mechanism includes a pair of pulleys (a driven pulley and a drive pulley) is exemplified.
- the drive mechanism of the present invention may include three or more pulleys.
- the metal belt and the drive mechanism including the metal belt according to the present invention as described above, the metal belt imparted with high durability against tensile stress by actively remaining compressive stress, and the A drive mechanism comprising a metal belt can be provided.
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Abstract
Description
<画像形成装置>
以下、本発明の金属ベルトを含む駆動機構を備えるプリンター(画像形成装置)について説明する。図1は、本発明の一実施形態のプリンター100の概略図である。なお、画像形成装置は、プリンターに限定されず、複写機、ファクシミリ、複合機等であってもよい。
次に、本発明の金属ベルト300を含む駆動機構200について説明する。図2は、本発明の一実施形態の駆動機構200の概略図である。駆動機構200は、金属ベルト300と、該金属ベルト300が架け渡される一対のプーリー(従動プーリー400および駆動プーリー500)とを含む。駆動機構200は、たとえば上記したプリンター100(図1参照)が備える各部位を、金属ベルト減速駆動方式に基づいて回転駆動する機構である。以下、一例として感光体ドラム112(図1参照)を回転駆動する駆動機構200の各構成について説明する。
一対のプーリーは、従動プーリー400と駆動プーリー500とを含む。図3Aは、従動プーリー400の形状を説明する概略斜視図であり、図3Bは従動プーリー400の幅方向(周方向と直交する方向)の断面図である。従動プーリー400は、上面410、下面420および側周面430を有し、周方向と直交する断面視において径方向の外側に凸の断面形状を有する(いわゆるクラウン形状)。
金属ベルト300は、金属製の帯状体によって形成された無端のベルトである。金属からなるベルトを用いることにより、従来の樹脂ギアを用いる場合と比べて剛性が高く、噛み合いの抑制された駆動機構が得られる。金属ベルト300は、環状に拡げた状態で、従動プーリー400と駆動プーリー500とに架け渡して使用される(図2参照)。
図4は、外力を加えない自然状態の金属ベルト300aの部分断面図である。金属ベルト300aには、2つのリング片(第1リング片310aおよび第2リング片320a)が形成されている。第1リング片310aと第2リング片320aとは、リング片の径方向において重なったベルト重なり部(外力を加えない自然状態において、内在する圧縮応力により変形して形成された少なくとも2つのリング片が、そのリング径方向に二重に重なるベルト重なり部)を有する。
図5は、表状態の金属ベルト300bの一部破断斜視図である。図6は、図5のVI-VI線断面(幅方向断面)図である。表状態の金属ベルト300bは、上記のとおり、自然状態の金属ベルト300a(図4参照)に外力を加えて環状に拡げたものである。金属ベルト300bは、たとえば上記した一対のプーリーに架け渡される際に、プーリーの上面に近接される上周縁領域310bと、プーリーの下面に近接される下周縁領域320bと、上周縁領域310bと下周縁領域320bとの間に位置する中心領域330bとを有する。金属ベルト300bは、該金属ベルト300bの周方向と直交する断面視において径方向の外側に凸である断面形状を有しており、中心領域330bがもっとも径方向の外側に膨出した湾曲形状である。金属ベルト300bの径方向の内側には、上記したプーリーの側周面が相補的に接触する湾曲面340bが形成されている。
図8は、裏状態の金属ベルト300cの一部破断斜視図である。図9は、図8のIX-IX線断面図(幅方向断面)図である。裏状態の金属ベルト300cは、上記のとおり、表状態の金属ベルト300b(図5参照)の表裏を反転させたものである。本実施形態の金属ベルト300は、表状態だけではなく、裏状態においても使用することができるため、歩留まりが改善され、コストが削減される。
次に、本発明の金属ベルト300の製造方法について、図面を参照して説明する。図11A~11Cは、金属ベルト300の製造方法を説明する概略図であり、図11Aは加工途中のベルト原材600を示し、図11Bは切断される前の金属ベルト300dを示し、図11Cは、得られた金属ベルト300を示している。
<駆動機構>
以下、本発明の他の実施形態の駆動機構が、図面を参照して説明される。図12Aは、従動プーリー400aの概略斜視図であり、図12Bは、従動プーリー400aの一部を拡大した幅方向の断面図である。図13は、従動プーリー400aに架け渡された表状態の金属ベルト300bの一部を拡大した幅方向の断面図である。本実施形態の駆動機構は、従動プーリー400aの側周面430aの形状が、第1の実施形態における従動プーリー400の側周面430(図3B参照)の形状と異なる以外は、第1の実施形態における駆動機構200と同様の構成である。そのため、重複する説明は適宜省略される。
Claims (9)
- 帯状体によって形成された無端のベルトであって、
外力を加えない自然状態において、該ベルトに内在する圧縮応力により変形して形成された少なくとも2つのリング片が、そのリング径方向に二重に重なるベルト重なり部を有し、
前記自然状態から環状に拡げられた第1の状態において、当該ベルトの周方向と直交する断面視において径方向の外側に凸である断面形状を有する、金属ベルト。 - 厚みが30μm以下である、請求項1記載の金属ベルト。
- 前記第1の状態から表裏を反転させた第2の状態において、前記周方向と直交する断面視において径方向の内側に凸である断面形状を有する、請求項1記載の金属ベルト。
- 非磁性の金属からなる、請求項1に記載の金属ベルト。
- 金属ベルトと、該金属ベルトが架け渡されるプーリーとを含み、
前記金属ベルトは、
帯状体によって形成された無端のベルトであって、
外力を加えない自然状態において、該ベルトに内在する圧縮応力により変形して形成された少なくとも2つのリング片が、そのリング径方向に二重に重なるベルト重なり部を有し、
前記自然状態から環状に拡げられた第1の状態において、当該金属ベルトの周方向と直交する断面視において径方向の外側に凸である断面形状を有する、駆動機構。 - 前記金属ベルトは、前記プーリーに架け渡された状態において、
第1の応力を内在し、前記金属ベルトの幅方向の中心領域に形成される第1応力部分と、
前記第1の応力よりも小さな第2の応力を内在し、前記金属ベルトの周縁領域に形成される第2応力部分とを有する、請求項5記載の駆動機構。 - 前記金属ベルトは、前記第1応力部分において前記プーリーに架け渡される、請求項6記載の駆動機構。
- 前記プーリーは、周方向と直交する断面視において径方向の外側に凸である断面形状を有する、請求項5に記載の駆動機構。
- 前記金属ベルトは、
前記第1の状態から表裏を反転させた第2の状態において、前記周方向と直交する断面視において径方向の内側に凸である断面形状を有し、
該第2の状態において前記プーリーに架け渡される、請求項5に記載の駆動機構。
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US14/434,234 US9423002B2 (en) | 2013-05-28 | 2014-04-10 | Metal belt and driving mechanism with same metal belt |
EP14804555.2A EP2905505B1 (en) | 2013-05-28 | 2014-04-10 | Metal belt and driving mechanism with same metal belt |
CN201480002688.5A CN104736885B (zh) | 2013-05-28 | 2014-04-10 | 驱动机构 |
JP2015519733A JP6002842B2 (ja) | 2013-05-28 | 2014-04-10 | 金属ベルトを備える駆動機構 |
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JP7247513B2 (ja) | 2018-10-15 | 2023-03-29 | 京セラドキュメントソリューションズ株式会社 | 駆動伝達装置、画像形成装置 |
Also Published As
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CN104736885B (zh) | 2016-08-24 |
US20150233445A1 (en) | 2015-08-20 |
EP2905505A4 (en) | 2016-01-20 |
JP6002842B2 (ja) | 2016-10-05 |
JPWO2014192438A1 (ja) | 2017-02-23 |
CN104736885A (zh) | 2015-06-24 |
EP2905505A1 (en) | 2015-08-12 |
EP2905505B1 (en) | 2018-06-20 |
US9423002B2 (en) | 2016-08-23 |
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