US20120091610A1 - Developing blade and its manufacturing method - Google Patents
Developing blade and its manufacturing method Download PDFInfo
- Publication number
- US20120091610A1 US20120091610A1 US13/334,289 US201113334289A US2012091610A1 US 20120091610 A1 US20120091610 A1 US 20120091610A1 US 201113334289 A US201113334289 A US 201113334289A US 2012091610 A1 US2012091610 A1 US 2012091610A1
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- Prior art keywords
- cavity
- mold
- blade
- developing blade
- developing
- Prior art date
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- Abandoned
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 239000012778 molding material Substances 0.000 claims abstract description 35
- 238000005488 sandblasting Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 238000005422 blasting Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 11
- 229920002379 silicone rubber Polymers 0.000 claims description 9
- 239000004944 Liquid Silicone Rubber Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- 239000004945 silicone rubber Substances 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000003082 abrasive agent Substances 0.000 description 3
- 238000007872 degassing Methods 0.000 description 3
- -1 etc.) Inorganic materials 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229920006311 Urethane elastomer Polymers 0.000 description 2
- 229920004482 WACKER® Polymers 0.000 description 2
- 229920005558 epichlorohydrin rubber Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229920006310 Asahi-Kasei Polymers 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
-
- 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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31—Surface property or characteristic of web, sheet or block
Definitions
- the present invention relates generally to a developing blade and its manufacturing method, and more specifically to a developing blade used with developer equipment for electrophotographic imagers such as high-speed laser printers, copiers and facsimiles, and its manufacturing method.
- An imager making use of an electrophotographic imaging process comprises developer equipment for developing latent images on a photosensitive drum.
- a developer 201 known so far in the art, which is of the structure that comprises a hopper 202 , a developing roller 203 , a rotatable agitator 204 and a developing blade 205 (JP(A)2003-43812).
- a toner 206 in the hopper 202 is fed by the agitator 204 to the developing roller 203 so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller 203 by frictional electrification between the developing blade 205 and the developing roller 203 .
- the toner 206 passes from the developing roller 203 onto the photosensitive drum 207 with a latent image formed on it for development.
- the developing blade 205 known so far in the art is of the structure that comprises a rubber blade member 214 along the side edge 212 A of a metallic support member 212 having a thickness of about 0.1 mm.
- the developing roller 203 rotates at a high speed (of 24 rpm or more for instance) so as to cope with faster operation of the electrophotographic imagers such as laser printers, however, problems with the prior art developing blade are that the resulting images are likely to be poor in density, and streak as well.
- An object of the invention is to provide a developing blade capable of adapting to faster operation of electrophotographic imagers, and a method for manufacturing such a developing blade.
- a developing blade comprising a support member and a blade member located along one side edge of said support member, wherein said blade member has a surface shape defined by a maximum height roughness Ry of 0.35 to 4.5 ⁇ m and a length ratio under load t p (at a 30% cut level) of 15% or less.
- said side edge of said support member is covered with said blade member except both ends thereof.
- said blade member is located on each surface of said support member.
- the invention also provides a method for manufacturing a developing blade including a blade member located along one side edge of a support member, wherein a top mold comprising a mold surface with a cavity formed for formation of a blade member and a gate in communication with said cavity, wherein said cavity is sandblasted with an abrasive in a range of #150 to #1000, and a bottom mold having a flat mold surface are used, both molds are clamped together while said top mold is brought in alignment with said bottom mold such that at least a part of said support member is positioned in said cavity, and a molding material is poured from said gate to fill in said cavity.
- the invention provides a method for manufacturing a developing blade including a blade member located on each surface of a support member along one side edge of said support member, wherein a top mold comprising a mold surface with a cavity formed for the formation of a blade member and a gate in communication with said cavity, wherein said cavity is sandblasted with an abrasive in a range of #150 to #1000, and a bottom mold provided with a mold surface with a cavity formed for the formation of a blade member, wherein said cavity is sandblasted with an abrasive in a range of #150 to #1000, are used; both molds are clamped together while said top mold is brought in alignment with said bottom mold such that said cavities oppose each other with said support member therebetween; and a molding material is poured from said gate to fill in said cavities.
- said sandblasting is carried out using a pressurized blasting apparatus, and a ceramic abrasive is used for said abrasive.
- said cavity has a wall surface curved and recessed at the deepest site.
- said molding material is a liquid silicone rubber/curing agent mixture.
- FIG. 1 is a plan view of one exemplary top mold used with the developing blade manufacturing method of the invention.
- FIG. 2 is illustrative in section of a bottom mold being clamped together with the top mold of FIG. 1 ;
- FIG. 2A is a sectional view as taken on line A-A of FIG. 1
- FIG. 2B is a sectional view as taken on line B-B of FIG. 1
- FIG. 2C is a sectional view as taken on line C-C of FIG. 1 .
- FIG. 3 is a perspective view of one embodiment of the developing blade according to the invention.
- FIG. 4 is a plan view of the developing blade shown in FIG. 3 .
- FIG. 5 is a perspective view of another embodiment of the developing blade according to the invention.
- FIG. 6 is a plan view of another example of the top mold used with the developing blade manufacturing method according to the invention.
- FIG. 7 is a perspective view of another embodiment of the developing blade according to the invention.
- FIG. 8 is a plan view of yet another example of the top mold used with the developing blade manufacturing method according to the invention.
- FIG. 9 is a perspective view of yet another embodiment of the developing blade according to the invention.
- FIGS. 10A , 10 B and 10 C are illustrative in section, as in FIG. 2 , of a further example of the mold assembly used with the developing blade manufacturing method according to the invention.
- FIG. 11 is a perspective view of a further embodiment of the developing blade according to the invention.
- FIGS. 12A , 12 B and 12 C are illustrative in section, as in FIG. 2 , of a further example of the mold assembly used with the developing blade manufacturing method according to the invention.
- FIG. 13 is illustrative in section of the mold assembly of FIG. 12 being cut along the lengthwise direction of the cavity.
- FIG. 14 is illustrative of a further embodiment of the developing blade according to the invention.
- FIG. 14A is a front view and
- FIG. 14B is a back view.
- FIG. 15 is a sectional view of the developing blade of FIG. 14 as taken on line A-A.
- FIGS. 16A , 16 B and 16 C are illustrative in section, as in FIG. 2 , of a further example of the mold assembly used with the developing blade manufacturing method according to the invention.
- FIG. 17 is illustrative in section of the mold assembly of FIG. 16 being cut along the lengthwise direction of the cavity.
- FIG. 18 is illustrative of a further embodiment of the developing blade according to the invention.
- FIG. 18A is a front view and
- FIG. 18B is a back view.
- FIG. 19 is a sectional view of the developing blade of FIG. 18 as taken on line A-A.
- FIG. 20 is illustrative of one example of the structure of the developer equipment.
- FIG. 21 is illustrative in perspective of one example of the prior art developing blade.
- FIG. 1 is a plan view of one exemplary top mold used with the developing blade manufacturing method of the invention.
- FIG. 2 is illustrative in section of a bottom mold being clamped together with the top mold of FIG. 1 ;
- FIG. 2A is a sectional view as taken on line A-A of FIG. 1
- FIG. 2B is a sectional view as taken on line B-B of FIG. 1
- FIG. 2C is a sectional view as taken on line C-C of FIG. 1 .
- a mold assembly 1 used herein is built up of a top mold 2 and a bottom mold 3 .
- the top mold 2 comprises a mold surface 2 A (the plane hatched in FIG. 1 ) with a cavity 4 formed in it for the formation of a blade member, an inlet port 5 formed in a back surface 4 a of the cavity 4 on one end side in the lengthwise direction of the cavity 4 (the direction indicated by an arrow a in FIG. 1 ), one gate 6 positioned at the inlet port 5 , and a reservoir 7 formed in the back surface 4 a of the cavity 4 on the other end side in the lengthwise direction.
- the deepest portion of the cavity 4 (the deepest site as viewed from the mold surface 2 A of the top mold 2 ) is curved and recessed, while the bottom mold 3 has a flat mold surface 3 A.
- inlet port 5 and reservoir 7 may be reversed in position in the lengthwise direction, and that the depths, widths (in the lengthwise direction of the cavity 4 ) and lengths (in a direction orthogonal to the lengthwise direction of the cavity 4 ) of the inlet port 5 and reservoir 7 may be determined as desired.
- the top mold 2 used herein has the cavity 4 sand-blasted with an abrasive in the range of #150 to #1,000.
- an abrasive in the range of #150 to #1,000.
- the abrasive used for sandblasting has a fine grain size exceeding #1,000, it may cause the area of contact of the blade member of the ensuing developing blade with a developing roller to grow too large for the smooth rotation of the developing roller due to frictional resistance between both, and the developing blade and developing roller to skid off, failing to produce good images.
- the abrasive has a coarse grain size short of #150, on the other hand, it may cause the area of contact of the blade member of the ensuing developing blade with a developing roller to become small, rendering it difficult to bring about sufficient electrification of the toner due to a decreased friction between both and, hence, making the density of the resultant image low.
- Another problem is that fine asperities on the blade member of the developing blade may be scraped down, entering the toner in the form of foreign matters.
- the abrasive material used for sandblasting is preferably a ceramic material exemplified by silicon carbide (available in the trade name of Carborundum, etc.), alundum, and emery.
- Sandblasting may be carried out using pressurized blasting apparatus, vacuum blasting apparatus, wet blasting apparatus, ultra-pressurized water jet blasting apparatus, centrifugal blasting apparatus, etc., although particular preference is given to the pressurized blasting apparatus.
- a pressure of 1 to 10 kg/cm 2 may be applied while the distance between the apparatus and the member to be sandblasted (the cavity 4 in the top mold 2 ) may be set at 50 to 200 mm and the blasting angle of the abrasive with the member to be sandblasted (the angle of the abrasive with the flat mold surface 2 A of the top mold 2 ) may be set at 90° ⁇ 20°, as desired. More specific conditions are a pressure of 4 kg/cm 2 , a distance of 100 mm and an angle of 90°.
- top mold 2 and the bottom mold 3 in alignment are clamped together such that the cavity 4 is closed up with a support member 12 .
- the top mold 2 and the bottom mold 3 are clamped together at a pressure of, for instance, 0.5 to 3 MPa per cavity.
- a molding material is pored from a gate 6 , and flows through the cavity 4 along a flow line indicated by a chain line in FIG. 1 , flowing over it and arriving at the reservoir 7 .
- the surface state of the sandblasted cavity 4 is reflected on the molding material filling in the cavity 4 , whereby the blade member is formed on the support member 12 , yielding the developing blade.
- the surface state of the blade member of the ensuing developing blade is going to have a fine asperity pattern on which the surface state of the sandblasted cavity 4 is reflected.
- the molding material used herein includes silicone rubber, nitrile rubber, fluororubber, urethane rubber, epichlorohydrin rubber, hydrogenated nitrile rubber, among which the silicone rubber is most preferred.
- silicone rubber nitrile rubber, fluororubber, urethane rubber, epichlorohydrin rubber, hydrogenated nitrile rubber, among which the silicone rubber is most preferred.
- LR3303 made by Asashi Kasei Wacker Co., Ltd.
- FIG. 3 is a perspective view of one embodiment of the developing blade according to the invention
- FIG. 4 is a plan view of the developing blade depicted in FIG. 3
- a developing blade 11 comprises a support member 12 and a blade member 14 formed along one side edge 12 A of the support member 12 .
- the area of contact of the blade member 14 with the developing roller defines a curved surface.
- the surface shape of the blade member 14 of the developing blade 11 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 ⁇ m, preferably 0.35 to 4.0 ⁇ m, and a length ratio under load t p (at a 30% cut level) of 15% or lower, preferably 12% or lower.
- the maximum height roughness Ry here is defined by the sum of the maximum value of a peak height Rp and the maximum value of a valley height Rv of a roughness curve and, in the invention, that is measured with a surface roughness apparatus (Surfcom 2800E made by Tokyo Seimitsu Co., Ltd.). The same will apply hereinafter.
- the length ratio under load t p (at a 30% cut level) is defined by a ratio (in percentage) of the sum of horizontal lengths (length under load ⁇ p ) to a reference length.
- the sum of horizontal lengths is obtained when only the reference length (0.8 mm) is extracted out of the roughness curve in the direction of its average line and a roughness curve for the extract is cut at a cut level (30% of Ry) parallel with a peak line and, in the invention, that is measured with a surface roughness gauge (Surfcom 2800E made by Tokyo Seimitsu Co., Ltd.). The same will apply hereinafter.
- the material of the support member 12 forming a part of the developing blade 11 of the invention for instance, specific reference is made to a metal substrate such as one made up of stainless steel, e.g., SUS301 and SUS304, and phosphor bronze for springs, e.g., C5210, a ceramics substrate, a resin substrate such as one made up of PC (polycarbonate), and PBT (polybutylene terephthalate).
- the thickness of the support member 12 is, for instance, approximately 1 mm in case of stainless steel.
- the support member 12 also comprises a plurality of holes 13 along the side edge 12 B opposite to the side edge 12 A. Such holes 13 may optionally be used for mounting, alignment or the like; they are never limited to what is illustrated in the drawings.
- the material of the blade member 14 that forms a part of the developing blade 11 includes silicone rubber, nitrile rubber, flurorubber, urethane rubber, epichlorohydrin rubber, hydrogenated nitrile rubber, among which the silicone rubber is most preferred.
- Such inventive developing blade 11 may be manufactured by the inventive manufacturing method using the aforesaid top mold 2 and bottom mold 3 .
- the blade member 14 has on its surface a fine asperity pattern on which the surface state of the sandblasted cavity 4 is reflected. That fine asperity pattern has a maximum height roughness Ry of 0.35 to 4.5 ⁇ m and a length ratio under load t p (at a 30% cut level) of 15% or lower.
- skirt 15 extending from near one end of the blade member 14 in the lengthwise direction (the direction indicated by arrows a in FIGS. 3 and 4 ). That skirt 15 is a site formed by the inlet port 5 at which the gate 6 is positioned in the aforesaid top mold 2 .
- the molding material that flows over the cavity 4 remains stayed, for instance, forming such projection 17 as indicated by a two-dot (phantom) line in FIG. 4 .
- This projection 17 is removed from what is illustrated in FIG. 4 .
- the molding material that flows over the cavity 4 may remain stayed in the reservoir 7 , allowing the projection 17 having a shape conforming to the reservoir 7 to remain in the developing blade 11 , as shown in FIG. 5 .
- FIG. 6 is a plan view of another example of the top mold used with the method of manufacturing the inventive developing blade.
- the method of manufacturing the inventive developing blade is never limited to the aforesaid embodiment wherein the inlet port and the reservoir are independently provided in the top mold.
- a top mold 22 comprises a cavity 24 for a semicircular shape in section adapted to form a blade member, a combined inlet port and reservoir 25 extending on the back surface side 24 a of the cavity 24 along the lengthwise direction (the direction indicated by an arrow a in FIG. 6 ) of the cavity 24 , and a gate 26 positioned at one end of the combined inlet port and reservoir 25 .
- the site of the combined inlet port and reservoir 25 that is opposite to the side with the gate 26 positioned on it defines a reservoir 27 ; there is the structure provided in which the inlet port and the reservoir are not independent.
- the aforesaid cavity 24 is sandblasted with an abrasive in the range of #150 to #1000. This sandblasting may be applied to the combined inlet port and reservoir 25 , too.
- the site hatched in FIG. 6 stands for a flat mold surface 22 A.
- top mold 22 and the aforesaid bottom mold 3 in alignment are clamped together such that the cavity 24 is closed up with a support member.
- the pressure for clamping together the top mold 22 and the bottom mold 3 may be set in the range of, for instance, 0.5 to 3 MPa per cavity.
- the molding material is poured from the gate 26 so that it flows through, and fills in, the cavity 24 .
- the surface state of the sandblasted cavity 24 is reflected on the molding material filling in the cavity 24 , whereby the blade member is formed on the support member, yielding the developing blade.
- the surface state of the blade member of the ensuing developing blade is going to have a fine asperity pattern on which the surface state of the sandblasted cavity 24 is reflected.
- the molding material used herein may be the same as mentioned in conjunction with the aforesaid manufacturing method.
- FIG. 7 is a perspective view of another embodiment of the developing blade according to the invention.
- a developing blade 31 comprises a support member 32 , a blade member 34 formed along one side edge 32 A of the support member 32 , and a skirt 35 running contiguous to and along the blade member 34 in the lengthwise direction (the direction indicated by an arrow a) of the blade member 34 .
- the area of contact of the blade member 34 with the developing roller defines a curved surface.
- the surface shape of the blade member 34 of the developing blade 31 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 ⁇ m, preferably 0.35 to 4.0 ⁇ m, and a length ratio under load t p (at a 30% cut level) of 15% or lower, preferably 12% or lower.
- the material of the blade member 34 forming a part of the developing blade 31 according to the invention may be the same as that of the blade member 14 forming a part of the aforesaid developing bladed 11 .
- Such inventive developing blade 31 may be manufactured by the inventive manufacturing method using the aforesaid top mold 22 and the bottom mold 3 .
- the blade member 34 has on its surface a fine asperity pattern on which the surface state of the sandblasted cavity 24 is reflected. That fine asperity pattern has a maximum height roughness Ry of 0.35 to 4.5 ⁇ m and a length ratio under load t p (at a 30% cut level) of 15% or lower.
- the support member 32 forming a part of the developing blade 31 further comprises a plurality of holes 33 along the side edge 32 B opposite to the side edge 32 A, and that the support member 32 forming a part of the developing blade 31 may be the same as the support member 12 forming a part of the aforesaid developing blade 11 .
- FIG. 8 is a plan view of yet another example of the top mold used with the method of manufacturing the inventive developing blade.
- a top mold 42 comprises a cavity 44 for the formation of a blade member, a combined inlet port and reservoir 45 extending in the lengthwise direction (the direction indicated by an arrow a in FIG. 8 ) of the cavity 44 and formed continuously from the cavity 44 in a direction indicated by an arrow b without any step, and a gate 46 positioned at one end of the combined inlet port and reservoir 45 .
- the site of the combined inlet port and reservoir 45 that is opposite to the side with the gate 46 positioned on it defines a reservoir 47 ; there is the structure provided in which the inlet port and the reservoir are not independent.
- the aforesaid cavity 44 is sandblasted with an abrasive in the range of #150 to #1000. This sandblasting may be applied to the combined inlet port and reservoir 45 , too.
- the site hatched in FIG. 8 stands for a flat mold surface 42 A.
- top mold 42 and the aforesaid bottom mold 3 in alignment are clamped together such that the cavity 44 is closed up with a support member.
- the pressure for clamping together the top mold 42 and the bottom mold 3 may be set in the range of, for instance, 0.5 to 3 MPa per cavity.
- the molding material is poured from the gate 46 so that it flows through, and fills in, the cavity 44 .
- the surface state of the sandblasted cavity 44 is reflected on the molding material filling in the cavity 44 , whereby the blade member is formed on the support member, yielding the developing blade.
- the surface state of the blade member of the ensuing developing blade is going to have a fine asperity pattern on which the surface state of the sandblasted cavity 44 is reflected.
- the molding material used herein may be the same as mentioned in conjunction with the aforesaid manufacturing method.
- FIG. 9 is a perspective view of yet another embodiment of the developing blade according to the invention.
- a developing blade 51 comprises a support member 52 , a blade member 54 formed along one side edge 52 A of the support member 52 , and a skirt 55 running in the lengthwise direction (the direction indicated by an arrow a) of the blade member 54 . That skirt 55 runs continuously in the widthwise direction of the blade member 54 (the direction indicated by an arrow b) without any step.
- the surface shape of the blade member 54 of the developing blade 51 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 ⁇ m, preferably 0.35 to 4.0 ⁇ m, and a length ratio under load t p (at a 30% cut level) of 15% or lower, preferably 12% or lower.
- the material of the blade member 54 forming a part of the developing blade 51 according to the invention may be the same as that of the blade member 14 forming a part of the aforesaid developing bladed 11 .
- Such inventive developing blade 51 may be manufactured by the inventive manufacturing method using the aforesaid top mold 42 and bottom mold 3 .
- the blade member 54 has on its surface a fine asperity pattern on which the surface state of the sandblasted cavity 44 is reflected. That fine asperity pattern has a maximum height roughness Ry of 0.35 to 4.5 ⁇ m and a length ratio under load t p (at a 30% cut level) of 15% or lower.
- the support member 52 forming a part of the developing blade 51 further comprises a plurality of holes 53 along the side edge 52 B opposite to the side edge 52 A.
- the support member 52 forming a part of the developing blade 51 may be the same as the support member 12 forming a part of the aforesaid developing blade 11 .
- FIG. 10 is illustrative in section, as in FIG. 2 , of a further embodiment of the mold assembly used with the inventive developing blade manufacturing method;
- FIGS. 10A , 10 B and 10 C are sectional views of the sites of FIG. 1 as taken on lines A-A, B-B and C-C, respectively.
- a mold assembly 61 shown in FIGS. 10A , 10 B and 10 C are built up of a top mold 62 and a bottom mold 63 .
- the top mold 62 comprises a mold surface 62 A provided with a cavity 64 for the formation of a blade member and a recess 68 into which a support member is to be inserted, an inlet port 65 (see FIG.
- the wall surface of the cavity 64 at the deepest site (the site deepest from the mold surface 62 A of the top mold 62 ) is curved and recessed.
- the recess 68 for the insertion of the support member is conformed to the shape and thickness of the support member 72 such that one end edge 72 A of the support member 72 is positioned at the desired site of the cavity 64 .
- the bottom mold 63 has a flat mold surface 63 A.
- the top mold 62 too, has the cavity 64 sandblasted with an abrasive in the range of #150 to #1000.
- the inlet port 65 and the reservoir 67 may be reversed in position in the lengthwise direction of the cavity 64 , and that the depths, widths (in the lengthwise direction of the cavity 64 ) and lengths (in the direction orthogonal to the length direction of the cavity 64 ) of the inlet port 65 and the reservoir 67 may be determined as desired.
- the support member 72 is inserted into the recess 68 to position one end edge 72 A of the support member 72 at the cavity 64 .
- top mold 62 and bottom mold 63 are clamped together to pour the molding material from the gate 66 .
- the pressure for clamping together the top mold 62 and the bottom mold 63 may be set in the range of, for instance, 0.5 to 3 MPa per cavity.
- the surface state of the sandblasted cavity 64 is reflected on the molding material filling in the cavity 64 , whereby the blade member is formed on the support member 72 , yielding the developing blade.
- the surface state of the blade member of the ensuing developing blade is going to have a fine asperity pattern on which the surface state of the sandblasted cavity 64 is reflected.
- the molding material used herein may be the same as mentioned in conjunction with the aforesaid manufacturing method.
- FIG. 11 is a perspective view of a further embodiment of the developing blade according to the invention.
- a developing blade 71 comprises a support member 72 , and a blade member 74 formed along one side edge 72 A of the support member 72 in such a way as to cover the side edge 72 A.
- the area of contact of that blade member 74 with the developing roller defines a curved surface.
- the surface shape of the blade member 74 of the developing blade 71 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 ⁇ m, preferably 0.35 to 4.0 ⁇ m, and a length ratio under load t p (at a 30% cut level) of 15% or lower, preferably 12% or lower.
- the material of the blade member 74 forming a part of the developing blade 71 according to the invention may be the same as that of the blade member 14 forming a part of the aforesaid developing bladed 11 .
- Such inventive developing blade 71 may be manufactured by the inventive manufacturing method using the aforesaid top mold 62 and bottom mold 63 .
- the blade member 74 has on its surface a fine asperity pattern on which the surface state of the sandblasted cavity 64 is reflected. That fine asperity pattern has a maximum height roughness Ry of 0.35 to 4.5 ⁇ m and a length ratio under load t p (at a 30% cut level) of 15% or lower.
- the support member 72 forming a part of the developing blade 71 further comprises a plurality of holes 73 along the end edge 72 B opposite to the side edge 72 A, and that the support member 72 forming a part of the developing blade 71 may be the same as the support member 12 forming a part of the aforesaid developing blade 11 .
- FIG. 12 is illustrative in section, as in FIG. 2 , of a further example of the mold assembly used with the inventive developing blade manufacturing method;
- FIGS. 12A , 12 B and 12 C are sectional views of the sites corresponding to lines A-A, B-B and C-C of FIG. 1 , respectively.
- a mold assembly 81 shown in FIGS. 12A , 12 B and 12 C is built up of a top mold 82 and a bottom mold 83 .
- the top mold 82 comprises a mold surface 82 A with a cavity 84 formed for the formation of a blade member, an inlet port 85 (see FIG. 12A ) provided in a back surface portion 84 a near one end of the cavity 84 in the length-wise direction (the direction coming out of the paper), a gate 86 positioned at the inlet port 85 and a communication portion 88 (see FIG. 12C ) provided in the back surface portion 84 a near the other end of the cavity 84 in the lengthwise direction.
- the bottom mold 83 comprises a mold surface 83 A with a cavity 84 ′ formed for the formation of a blade member, a reservoir 87 (see FIG. 12A ) provided in a back surface portion 84 ′ a near one end of the cavity 84 ′ in the lengthwise direction (the direction coming out of the paper), and a communication portion 88 ′ (see FIG. 12C ) provided in the back surface portion 84 ′ a near the other end of the cavity 84 ′ in the lengthwise direction.
- top mold 82 and bottom mold 83 too, have the cavities 84 and 84 ′ sandblasted with an abrasive in the range of #150 to #1000.
- the support member 92 is inserted in such a place that the cavity 84 opposes the cavity 84 ′ with the support member 92 between them, the communication portion 88 opposes the communication portion 88 ′ with the support member 92 between them, and a through-hole 99 in the support member 92 is positioned at a site where the communication portions 88 and 88 ′ oppose each other.
- the top mold 82 and the bottom mold 83 are clamped together. Thereafter, the molding material is poured from the gate 86 to fill in the cavities 84 and 84 ′, yielding the developing blade.
- the molding material poured from the inlet port 85 at which the gate 86 is positioned flows through the cavity 84 in the top mold 82 along a flow line indicated by a chain line in FIG. 13 , arriving at the communication portion 88 . And, through the through-hole 99 in the support member 92 positioned here, it arrives at the communication portion 88 ′, whence it flows through the cavity 84 ′ in the bottom mold 83 , flowing over it and arriving at the reservoir 87 .
- the flow of the molding material through the cavities 84 , 84 ′ is good enough to prevent the occurrence of sink marks and weld marks, and even when there are air bubbles in the molding material, it is possible to form an intimate blade member of uniform thickness and without air bubbles, because such air bubbles are collected in the overflowing reservoir 87 for degassing.
- the surface state of the sandblasted cavities 84 and 84 ′ is reflected on the surface of the blade member of the obtained developing blade, making sure a fine asperity pattern.
- molding material used herein may be the same as mentioned in connection with the aforesaid manufacturing method.
- FIG. 14 is illustrative of a further embodiment of the developing blade according to the invention.
- FIG. 14A is a front view and the FIG. 14B a back view.
- FIG. 15 is a sectional view of the developing blade of FIG. 14 as taken on line A-A.
- a developing blade 91 comprises a support member 92 , a blade member 94 formed at one surface of the support member 92 along one side edge 92 A, and a blade member 94 ′ formed at the other surface.
- That blade member 94 is formed along the side edge 92 A of the support member 92 , with its area of contact with a developing roller defining a curved surface. Further, there is a skirt 95 near one end of the blade member 94 in the lengthwise direction (the direction indicated by an arrow a in FIG. 14 ), and there is a skirt 98 near the other end.
- the blade member 94 ′ is formed along the side edge 92 A in such a way as to oppose the blade member 94 with the support member 92 between them, and its area of contact with the developing roller defines a curves surface.
- a skirt 98 ′ formed in such a way as to oppose that skirt 98 with the support member 92 between them.
- the surface shape of the blade member 94 , 94 ′ of such developing blade 91 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 ⁇ m, preferably 0.35 to 4.0 ⁇ m, and a length ratio under load t p (at a 30% cut level) of 150 or lower, preferably 12% or lower.
- inventive developing blade 91 comprising such blade members 94 and 94 ′, it is possible to hold back an increase in its frictional resistance to the developing roller and allow the toner to be full electrified so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller, even when that developing roller rotates at high speeds (of 24 rpm or more, for instance).
- the support member 92 forming a part of the developing blade 91 further comprises a plurality of holes 93 along the side edge 92 B opposite to the side edge 92 A.
- Such holes 93 may optionally be used for mounting, alignment or the like; they are never limited to what is illustrated in the drawings.
- the material of the blade member 94 , 94 ′ forming a part of the inventive developing blade 91 may be the same as mentioned with reference to the blade member 14 forming a part of the aforesaid developing blade 11 .
- FIG. 16 is illustrative in section, as in FIG. 2 , of a further example of the mold assembly used with the inventive developing blade manufacturing method;
- FIGS. 16A , 16 B and 16 C are sectional views of the sites corresponding to lines A-A, B-B and C-C of FIG. 1 , respectively.
- a mold assembly 101 shown in FIGS. 16A , 16 B and 16 C is built up of a top mold 102 and a bottom mold 103 .
- the top mold 102 comprises a mold surface 102 A provided with a cavity 104 for the formation of a blade member and a recess 108 into which the support member is to be inserted, an inlet port 105 (see FIG. 16A ) provided in a back surface portion 104 a near one end of the cavity 104 in the lengthwise direction (the direction coming out of the paper), and a gate 106 positioned at the inlet port 105 .
- the bottom mold 103 comprises a mold surface 103 A with a cavity 104 ′ formed for the formation of a blade member, and a reservoir 107 (see FIG. 16C ) provided in a back surface portion 104 ′ a near one end of the cavity 104 ′ in the lengthwise direction (the direction coming out of the paper).
- top mold 102 and bottom mold 103 too, have the cavities 104 and 104 ′ sandblasted with an abrasive in the range of #150 to #1000.
- the support member 112 is inserted into the recess 108 such that the end edge 112 A of the support member 112 is positioned in a space where the cavities 104 and 104 ′ oppose each other.
- the top mold 102 and the bottom mold 103 in alignment are clamped together.
- the molding material is poured from the gate 106 to fill in the cavities 104 and 104 ′, yielding the developing blade.
- the molding material poured from the inlet port 105 at which the gate 106 is positioned flows concurrently through the cavity 104 in the top mold 102 and the cavity 104 ′ in the bottom mold 103 along a flow line indicated by a chain line in FIG. 17 , flowing over them and arriving at the reservoir 107 .
- the flow of the molding material through the cavities 104 , 104 ′ is good enough to prevent the occurrence of sink marks and weld marks, and even when there are air bubbles in the molding material, it is possible to form an intimate blade member of uniform thickness and without air bubbles, because such air bubbles are collected in the overflowing reservoir 107 for degassing.
- the surface state of the sandblasted cavities 104 and 104 ′ is reflected on the surface of the blade member of the obtained developing blade, making sure a fine asperity pattern.
- molding material used herein may be the same as mentioned in connection with the aforesaid manufacturing method.
- FIG. 18 is illustrative of a further embodiment of the developing blade according to the invention.
- FIG. 18A is a front view and the FIG. 18B a back view.
- FIG. 19 is a sectional view of the developing blade of FIG. 18 as taken on line A-A.
- a developing blade 111 comprises a support member 112 , a blade member 114 formed at one surface of the support member 112 along one side edge 112 A, and a blade member 114 ′ formed at the other surface.
- Such blade members 114 and 114 ′ are formed in such a way as to cover the side edge 112 A. That is to say, at the tip of the developing blade 111 the blade members 114 and 114 ′ are contiguous to each other.
- the area of contact of the blade member 114 , 114 ′ with the developing blade defines a curved surface, and there is a skirt 115 formed near one end of the blade member 114 .
- the surface shape of the blade member 114 , 114 ′ of such developing blade 111 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 ⁇ m, preferably 0.35 to 4.0 ⁇ m, and a length ratio under load t p (at a 30% cut level) of 15% or lower, preferably 12% or lower.
- inventive developing blade 111 comprising such blade members 114 and 114 ′, it is possible to hold back an increase in its frictional resistance to the developing roller and allow the toner to be full electrified so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller, even when that developing roller rotates at high speeds (of 24 rpm or more, for instance).
- the support member 112 forming a part of the developing blade 111 further comprises a plurality of holes 113 along the side edge 112 B opposite to the side edge 112 A.
- Such holes 113 may optionally be used for mounting, alignment or the like; they are never limited to what is illustrated in the drawings.
- the material of the blade member 114 , 114 forming a part of the inventive developing blade 111 may be the same as mentioned with reference to the blade member 14 forming a part of the aforesaid developing blade 11 .
- a SUS 301 plate of 0.1 mm in thickness, 18 mm in width and 240 mm in length was readied up for the support member, and a liquid silicone rubber/curing agent mixture (LR3303 made by Asahi Kasei Wacker Co., Ltd.) was readied up for the molding material.
- LR3303 made by Asahi Kasei Wacker Co., Ltd.
- each cavity was sandblasted with ten abrasives in the range of #80 to #1500 under the following conditions to prepare 10 injection mold assemblies.
- each cavity was blasted with four glass abrasives in the range of #80 to #320 under same conditions as mentioned above to prepare four injection mold assemblies.
- Each of the obtained developing blades (samples 1 to 14) was mounted on a laser printer (HL5240 made by Brother Industries Co., Ltd.) to form images with the rotation speed of the developing roll set at 24 rpm.
- the thus formed images are observed in terms of density and streaks.
- the results are set out in Table 1.
- each of the developing blades (samples 3 to 8) prepared using an injection mold assembly having a cavity sandblasted with an abrasive in the range of #150 to #1000 has a blade member having a maximum height roughness Ry of 0.35 to 4.5 ⁇ m and a length ratio under load t p (at a 30% cut level) of 150 or less, figures indicating that good enough images of sufficient density can be produced out of a high speed type laser printer.
- the present invention is applicable to developing blades used on developers in electrophotographic imagers.
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Abstract
A method for manufacturing a developing blade including a blade member located along one side edge of a support member, comprising providing a top mold with a cavity, sandblasting the cavity with an abrasive in a range of #150 to #1000, clamping together the top mold and a bottom mold while the top mold is in alignment with the bottom mold while at least a part of the support member is positioned in the cavity, and pouring a molding material from a gate to fill the cavity.
Description
- The present application is a divisional application of U.S. patent application Ser. No. 11/952,604, filed on Dec. 7, 2007, the entire contents of which are herein incorporated by reference. This application also claims foreign priority to Japanese application nos. 2006-337801, filed Dec. 15, 2006 and 2007-061458 filed Mar. 12, 2007.
- The present invention relates generally to a developing blade and its manufacturing method, and more specifically to a developing blade used with developer equipment for electrophotographic imagers such as high-speed laser printers, copiers and facsimiles, and its manufacturing method.
- An imager making use of an electrophotographic imaging process comprises developer equipment for developing latent images on a photosensitive drum. For this developer, as shown typically in
FIG. 20 , there is adeveloper 201 known so far in the art, which is of the structure that comprises ahopper 202, a developingroller 203, arotatable agitator 204 and a developing blade 205 (JP(A)2003-43812). With thisdeveloper 201, atoner 206 in thehopper 202 is fed by theagitator 204 to the developingroller 203 so that the toner in thin layer form is uniformly carried on the peripheral surface of the developingroller 203 by frictional electrification between the developingblade 205 and the developingroller 203. And then, thetoner 206 passes from the developingroller 203 onto thephotosensitive drum 207 with a latent image formed on it for development. - As shown typically in
FIG. 21 , the developingblade 205 known so far in the art is of the structure that comprises arubber blade member 214 along theside edge 212A of ametallic support member 212 having a thickness of about 0.1 mm. - Now that the developing
roller 203 rotates at a high speed (of 24 rpm or more for instance) so as to cope with faster operation of the electrophotographic imagers such as laser printers, however, problems with the prior art developing blade are that the resulting images are likely to be poor in density, and streak as well. - An object of the invention is to provide a developing blade capable of adapting to faster operation of electrophotographic imagers, and a method for manufacturing such a developing blade.
- According to the invention, that object is achievable by the provision of a developing blade comprising a support member and a blade member located along one side edge of said support member, wherein said blade member has a surface shape defined by a maximum height roughness Ry of 0.35 to 4.5 μm and a length ratio under load tp (at a 30% cut level) of 15% or less.
- In an embodiment of the invention, said side edge of said support member is covered with said blade member except both ends thereof.
- In another embodiment of the invention, said blade member is located on each surface of said support member.
- With such an inventive developing blade as mentioned above wherein the blade member has a maximum height roughness Ry of 0.35 to 4.5 μm and a length ratio under load tp (at a 30% cut level) of 15% or less, it is possible to hold back an increase in its frictional resistance to the developing roller and allow the toner to be full electrified so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller, even when that developing roller rotates at high speeds (of 24 rpm or more, for instance). This could adapt well to faster operation of electro-photographic imagers.
- The invention also provides a method for manufacturing a developing blade including a blade member located along one side edge of a support member, wherein a top mold comprising a mold surface with a cavity formed for formation of a blade member and a gate in communication with said cavity, wherein said cavity is sandblasted with an abrasive in a range of #150 to #1000, and a bottom mold having a flat mold surface are used, both molds are clamped together while said top mold is brought in alignment with said bottom mold such that at least a part of said support member is positioned in said cavity, and a molding material is poured from said gate to fill in said cavity.
- Moreover, the invention provides a method for manufacturing a developing blade including a blade member located on each surface of a support member along one side edge of said support member, wherein a top mold comprising a mold surface with a cavity formed for the formation of a blade member and a gate in communication with said cavity, wherein said cavity is sandblasted with an abrasive in a range of #150 to #1000, and a bottom mold provided with a mold surface with a cavity formed for the formation of a blade member, wherein said cavity is sandblasted with an abrasive in a range of #150 to #1000, are used; both molds are clamped together while said top mold is brought in alignment with said bottom mold such that said cavities oppose each other with said support member therebetween; and a molding material is poured from said gate to fill in said cavities.
- In an embodiment of the manufacturing method of the invention, said sandblasting is carried out using a pressurized blasting apparatus, and a ceramic abrasive is used for said abrasive.
- In another embodiment of the manufacturing method of the invention, said cavity has a wall surface curved and recessed at the deepest site.
- In a further embodiment of the manufacturing method of the invention, said molding material is a liquid silicone rubber/curing agent mixture.
- With such an inventive manufacturing method as mentioned above wherein the cavity is sandblasted under given conditions so that the blade member of the obtained developing blade has a surface shape defined by a fine asperity pattern on which the surface shape of each cavity is reflected, i.e., a maximum height roughness Ry of 0.35 to 4.5 μm and a length ratio under load tp (at a 30% cut level) of 15% or less, it is possible to hold back an increase in its frictional resistance to the developing roller and allow the toner to be full electrified so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller, even when that developing roller rotates at high speeds (of 24 rpm or more, for instance). This could adapt well to faster operation of electrophotographic imagers.
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FIG. 1 is a plan view of one exemplary top mold used with the developing blade manufacturing method of the invention. -
FIG. 2 is illustrative in section of a bottom mold being clamped together with the top mold ofFIG. 1 ;FIG. 2A is a sectional view as taken on line A-A ofFIG. 1 ,FIG. 2B is a sectional view as taken on line B-B ofFIG. 1 , andFIG. 2C is a sectional view as taken on line C-C ofFIG. 1 . -
FIG. 3 is a perspective view of one embodiment of the developing blade according to the invention. -
FIG. 4 is a plan view of the developing blade shown inFIG. 3 . -
FIG. 5 is a perspective view of another embodiment of the developing blade according to the invention. -
FIG. 6 is a plan view of another example of the top mold used with the developing blade manufacturing method according to the invention. -
FIG. 7 is a perspective view of another embodiment of the developing blade according to the invention. -
FIG. 8 is a plan view of yet another example of the top mold used with the developing blade manufacturing method according to the invention. -
FIG. 9 is a perspective view of yet another embodiment of the developing blade according to the invention. -
FIGS. 10A , 10B and 10C are illustrative in section, as inFIG. 2 , of a further example of the mold assembly used with the developing blade manufacturing method according to the invention. -
FIG. 11 is a perspective view of a further embodiment of the developing blade according to the invention. -
FIGS. 12A , 12B and 12C are illustrative in section, as inFIG. 2 , of a further example of the mold assembly used with the developing blade manufacturing method according to the invention. -
FIG. 13 is illustrative in section of the mold assembly ofFIG. 12 being cut along the lengthwise direction of the cavity. -
FIG. 14 is illustrative of a further embodiment of the developing blade according to the invention;FIG. 14A is a front view andFIG. 14B is a back view. -
FIG. 15 is a sectional view of the developing blade ofFIG. 14 as taken on line A-A. -
FIGS. 16A , 16B and 16C are illustrative in section, as inFIG. 2 , of a further example of the mold assembly used with the developing blade manufacturing method according to the invention. -
FIG. 17 is illustrative in section of the mold assembly ofFIG. 16 being cut along the lengthwise direction of the cavity. -
FIG. 18 is illustrative of a further embodiment of the developing blade according to the invention;FIG. 18A is a front view andFIG. 18B is a back view. -
FIG. 19 is a sectional view of the developing blade ofFIG. 18 as taken on line A-A. -
FIG. 20 is illustrative of one example of the structure of the developer equipment. -
FIG. 21 is illustrative in perspective of one example of the prior art developing blade. - Embodiments of the invention are now explained with reference to the drawings.
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FIG. 1 is a plan view of one exemplary top mold used with the developing blade manufacturing method of the invention.FIG. 2 is illustrative in section of a bottom mold being clamped together with the top mold ofFIG. 1 ;FIG. 2A is a sectional view as taken on line A-A ofFIG. 1 ,FIG. 2B is a sectional view as taken on line B-B ofFIG. 1 , andFIG. 2C is a sectional view as taken on line C-C ofFIG. 1 . - Referring to
FIG. 1 andFIGS. 2A , 2B and 2C, amold assembly 1 used herein is built up of atop mold 2 and abottom mold 3. Thetop mold 2 comprises amold surface 2A (the plane hatched inFIG. 1 ) with acavity 4 formed in it for the formation of a blade member, aninlet port 5 formed in aback surface 4 a of thecavity 4 on one end side in the lengthwise direction of the cavity 4 (the direction indicated by an arrow a inFIG. 1 ), onegate 6 positioned at theinlet port 5, and areservoir 7 formed in theback surface 4 a of thecavity 4 on the other end side in the lengthwise direction. The deepest portion of the cavity 4 (the deepest site as viewed from themold surface 2A of the top mold 2) is curved and recessed, while thebottom mold 3 has aflat mold surface 3A. - It is noted that the
inlet port 5 andreservoir 7 may be reversed in position in the lengthwise direction, and that the depths, widths (in the lengthwise direction of the cavity 4) and lengths (in a direction orthogonal to the lengthwise direction of the cavity 4) of theinlet port 5 andreservoir 7 may be determined as desired. - The
top mold 2 used herein has thecavity 4 sand-blasted with an abrasive in the range of #150 to #1,000. As the abrasive used for sandblasting has a fine grain size exceeding #1,000, it may cause the area of contact of the blade member of the ensuing developing blade with a developing roller to grow too large for the smooth rotation of the developing roller due to frictional resistance between both, and the developing blade and developing roller to skid off, failing to produce good images. As the abrasive has a coarse grain size short of #150, on the other hand, it may cause the area of contact of the blade member of the ensuing developing blade with a developing roller to become small, rendering it difficult to bring about sufficient electrification of the toner due to a decreased friction between both and, hence, making the density of the resultant image low. Another problem is that fine asperities on the blade member of the developing blade may be scraped down, entering the toner in the form of foreign matters. - The abrasive material used for sandblasting is preferably a ceramic material exemplified by silicon carbide (available in the trade name of Carborundum, etc.), alundum, and emery. Sandblasting may be carried out using pressurized blasting apparatus, vacuum blasting apparatus, wet blasting apparatus, ultra-pressurized water jet blasting apparatus, centrifugal blasting apparatus, etc., although particular preference is given to the pressurized blasting apparatus. Referring to blasting conditions, for instance, a pressure of 1 to 10 kg/cm2 may be applied while the distance between the apparatus and the member to be sandblasted (the
cavity 4 in the top mold 2) may be set at 50 to 200 mm and the blasting angle of the abrasive with the member to be sandblasted (the angle of the abrasive with theflat mold surface 2A of the top mold 2) may be set at 90°±20°, as desired. More specific conditions are a pressure of 4 kg/cm2, a distance of 100 mm and an angle of 90°. - The
top mold 2 and thebottom mold 3 in alignment are clamped together such that thecavity 4 is closed up with asupport member 12. Thetop mold 2 and thebottom mold 3 are clamped together at a pressure of, for instance, 0.5 to 3 MPa per cavity. - Thereafter, a molding material is pored from a
gate 6, and flows through thecavity 4 along a flow line indicated by a chain line inFIG. 1 , flowing over it and arriving at thereservoir 7. And the surface state of the sandblastedcavity 4 is reflected on the molding material filling in thecavity 4, whereby the blade member is formed on thesupport member 12, yielding the developing blade. The surface state of the blade member of the ensuing developing blade is going to have a fine asperity pattern on which the surface state of the sandblastedcavity 4 is reflected. - The molding material used herein, for instance, includes silicone rubber, nitrile rubber, fluororubber, urethane rubber, epichlorohydrin rubber, hydrogenated nitrile rubber, among which the silicone rubber is most preferred. There is the more specific mention of a mixture of liquid silicone rubber and a curing agent, and LR3303 (made by Asashi Kasei Wacker Co., Ltd.).
- It is here noted that the flow of the molding material through
such cavity 4 as mentioned above is good enough to prevent the occurrence of sink marks and weld marks, and that even when there are air bubbles in the molding material, it is possible to form an intimate blade member of uniform thickness and without air bubbles, because such air bubbles are collected in the overflowingreservoir 7 for degassing. -
FIG. 3 is a perspective view of one embodiment of the developing blade according to the invention, andFIG. 4 is a plan view of the developing blade depicted inFIG. 3 . As shown inFIGS. 3 and 4 , a developingblade 11 comprises asupport member 12 and ablade member 14 formed along oneside edge 12A of thesupport member 12. The area of contact of theblade member 14 with the developing roller defines a curved surface. - The surface shape of the
blade member 14 of the developingblade 11 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 μm, preferably 0.35 to 4.0 μm, and a length ratio under load tp (at a 30% cut level) of 15% or lower, preferably 12% or lower. With the inventive developingblade 11 comprisingsuch blade member 14, it is possible to hold back an increase in its frictional resistance to the developing roller and allow the toner to be full electrified so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller, even when that developing roller rotates at high speeds (of 24 rpm or more, for instance). - The maximum height roughness Ry here is defined by the sum of the maximum value of a peak height Rp and the maximum value of a valley height Rv of a roughness curve and, in the invention, that is measured with a surface roughness apparatus (Surfcom 2800E made by Tokyo Seimitsu Co., Ltd.). The same will apply hereinafter.
- The length ratio under load tp (at a 30% cut level) is defined by a ratio (in percentage) of the sum of horizontal lengths (length under load ηp) to a reference length. The sum of horizontal lengths is obtained when only the reference length (0.8 mm) is extracted out of the roughness curve in the direction of its average line and a roughness curve for the extract is cut at a cut level (30% of Ry) parallel with a peak line and, in the invention, that is measured with a surface roughness gauge (Surfcom 2800E made by Tokyo Seimitsu Co., Ltd.). The same will apply hereinafter.
- There is no particular limitation imposed on the material of the
support member 12 forming a part of the developingblade 11 of the invention; for instance, specific reference is made to a metal substrate such as one made up of stainless steel, e.g., SUS301 and SUS304, and phosphor bronze for springs, e.g., C5210, a ceramics substrate, a resin substrate such as one made up of PC (polycarbonate), and PBT (polybutylene terephthalate). The thickness of thesupport member 12 is, for instance, approximately 1 mm in case of stainless steel. Thesupport member 12 also comprises a plurality ofholes 13 along theside edge 12B opposite to theside edge 12A.Such holes 13 may optionally be used for mounting, alignment or the like; they are never limited to what is illustrated in the drawings. - The material of the
blade member 14 that forms a part of the developingblade 11, for instance, includes silicone rubber, nitrile rubber, flurorubber, urethane rubber, epichlorohydrin rubber, hydrogenated nitrile rubber, among which the silicone rubber is most preferred. - Such inventive developing
blade 11 may be manufactured by the inventive manufacturing method using the aforesaidtop mold 2 andbottom mold 3. By manufacturing the developingblade 11 with the aforesaid inventive manufacturing method, theblade member 14 has on its surface a fine asperity pattern on which the surface state of the sandblastedcavity 4 is reflected. That fine asperity pattern has a maximum height roughness Ry of 0.35 to 4.5 μm and a length ratio under load tp (at a 30% cut level) of 15% or lower. - It is here noted that there is a
skirt 15 extending from near one end of theblade member 14 in the lengthwise direction (the direction indicated by arrows a inFIGS. 3 and 4 ). Thatskirt 15 is a site formed by theinlet port 5 at which thegate 6 is positioned in the aforesaidtop mold 2. In thereservoir 7 in the aforesaidtop mold 2, on the other hand, the molding material that flows over thecavity 4 remains stayed, for instance, formingsuch projection 17 as indicated by a two-dot (phantom) line inFIG. 4 . Thisprojection 17 is removed from what is illustrated inFIG. 4 . Alternatively, the molding material that flows over thecavity 4 may remain stayed in thereservoir 7, allowing theprojection 17 having a shape conforming to thereservoir 7 to remain in the developingblade 11, as shown inFIG. 5 . -
FIG. 6 is a plan view of another example of the top mold used with the method of manufacturing the inventive developing blade. The method of manufacturing the inventive developing blade is never limited to the aforesaid embodiment wherein the inlet port and the reservoir are independently provided in the top mold. In the embodiment shown inFIG. 6 , atop mold 22 comprises acavity 24 for a semicircular shape in section adapted to form a blade member, a combined inlet port andreservoir 25 extending on theback surface side 24 a of thecavity 24 along the lengthwise direction (the direction indicated by an arrow a inFIG. 6 ) of thecavity 24, and agate 26 positioned at one end of the combined inlet port andreservoir 25. And the site of the combined inlet port andreservoir 25 that is opposite to the side with thegate 26 positioned on it defines areservoir 27; there is the structure provided in which the inlet port and the reservoir are not independent. In this case, too, theaforesaid cavity 24 is sandblasted with an abrasive in the range of #150 to #1000. This sandblasting may be applied to the combined inlet port andreservoir 25, too. Note here that the site hatched inFIG. 6 stands for aflat mold surface 22A. - As in
FIG. 2 , suchtop mold 22 and the aforesaidbottom mold 3 in alignment are clamped together such that thecavity 24 is closed up with a support member. The pressure for clamping together thetop mold 22 and thebottom mold 3 may be set in the range of, for instance, 0.5 to 3 MPa per cavity. - Thereafter, the molding material is poured from the
gate 26 so that it flows through, and fills in, thecavity 24. And the surface state of the sandblastedcavity 24 is reflected on the molding material filling in thecavity 24, whereby the blade member is formed on the support member, yielding the developing blade. The surface state of the blade member of the ensuing developing blade is going to have a fine asperity pattern on which the surface state of the sandblastedcavity 24 is reflected. - The molding material used herein may be the same as mentioned in conjunction with the aforesaid manufacturing method.
-
FIG. 7 is a perspective view of another embodiment of the developing blade according to the invention. As shown inFIG. 7 , a developingblade 31 comprises asupport member 32, ablade member 34 formed along oneside edge 32A of thesupport member 32, and askirt 35 running contiguous to and along theblade member 34 in the lengthwise direction (the direction indicated by an arrow a) of theblade member 34. The area of contact of theblade member 34 with the developing roller defines a curved surface. - The surface shape of the
blade member 34 of the developingblade 31 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 μm, preferably 0.35 to 4.0 μm, and a length ratio under load tp (at a 30% cut level) of 15% or lower, preferably 12% or lower. With the inventive developingblade 31 comprisingsuch blade member 34, it is possible to hold back an increase in its frictional resistance to the developing roller and allow the toner to be full electrified so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller, even when that developing roller rotates at high speeds (of 24 rpm or more, for instance). - The material of the
blade member 34 forming a part of the developingblade 31 according to the invention may be the same as that of theblade member 14 forming a part of the aforesaid developing bladed 11. - Such inventive developing
blade 31 may be manufactured by the inventive manufacturing method using the aforesaidtop mold 22 and thebottom mold 3. By manufacturing the developingblade 31 with the aforesaid inventive manufacturing method, theblade member 34 has on its surface a fine asperity pattern on which the surface state of the sandblastedcavity 24 is reflected. That fine asperity pattern has a maximum height roughness Ry of 0.35 to 4.5 μm and a length ratio under load tp (at a 30% cut level) of 15% or lower. - It is here noted that the
support member 32 forming a part of the developingblade 31 further comprises a plurality ofholes 33 along theside edge 32B opposite to theside edge 32A, and that thesupport member 32 forming a part of the developingblade 31 may be the same as thesupport member 12 forming a part of the aforesaid developingblade 11. -
FIG. 8 is a plan view of yet another example of the top mold used with the method of manufacturing the inventive developing blade. In the embodiment shown inFIG. 8 , atop mold 42 comprises acavity 44 for the formation of a blade member, a combined inlet port andreservoir 45 extending in the lengthwise direction (the direction indicated by an arrow a inFIG. 8 ) of thecavity 44 and formed continuously from thecavity 44 in a direction indicated by an arrow b without any step, and agate 46 positioned at one end of the combined inlet port andreservoir 45. The site of the combined inlet port andreservoir 45 that is opposite to the side with thegate 46 positioned on it defines areservoir 47; there is the structure provided in which the inlet port and the reservoir are not independent. In this case, too, theaforesaid cavity 44 is sandblasted with an abrasive in the range of #150 to #1000. This sandblasting may be applied to the combined inlet port andreservoir 45, too. Note here that the site hatched inFIG. 8 stands for a flat mold surface 42A. - As in
FIG. 2 , suchtop mold 42 and the aforesaidbottom mold 3 in alignment are clamped together such that thecavity 44 is closed up with a support member. The pressure for clamping together thetop mold 42 and thebottom mold 3 may be set in the range of, for instance, 0.5 to 3 MPa per cavity. - Thereafter, the molding material is poured from the
gate 46 so that it flows through, and fills in, thecavity 44. And the surface state of the sandblastedcavity 44 is reflected on the molding material filling in thecavity 44, whereby the blade member is formed on the support member, yielding the developing blade. The surface state of the blade member of the ensuing developing blade is going to have a fine asperity pattern on which the surface state of the sandblastedcavity 44 is reflected. - The molding material used herein may be the same as mentioned in conjunction with the aforesaid manufacturing method.
-
FIG. 9 is a perspective view of yet another embodiment of the developing blade according to the invention. As shown inFIG. 9 , a developingblade 51 comprises asupport member 52, ablade member 54 formed along oneside edge 52A of thesupport member 52, and askirt 55 running in the lengthwise direction (the direction indicated by an arrow a) of theblade member 54. Thatskirt 55 runs continuously in the widthwise direction of the blade member 54 (the direction indicated by an arrow b) without any step. - The surface shape of the
blade member 54 of the developingblade 51 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 μm, preferably 0.35 to 4.0 μm, and a length ratio under load tp (at a 30% cut level) of 15% or lower, preferably 12% or lower. With the inventive developingblade 51 comprisingsuch blade member 54, it is possible to hold back an increase in its frictional resistance to the developing roller and allow the toner to be full electrified so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller, even when that developing roller rotates at high speeds (of 24 rpm or more, for instance). - The material of the
blade member 54 forming a part of the developingblade 51 according to the invention may be the same as that of theblade member 14 forming a part of the aforesaid developing bladed 11. - Such inventive developing
blade 51 may be manufactured by the inventive manufacturing method using the aforesaidtop mold 42 andbottom mold 3. By manufacturing the developingblade 51 with the aforesaid inventive manufacturing method, theblade member 54 has on its surface a fine asperity pattern on which the surface state of the sandblastedcavity 44 is reflected. That fine asperity pattern has a maximum height roughness Ry of 0.35 to 4.5 μm and a length ratio under load tp (at a 30% cut level) of 15% or lower. - It is here noted that the
support member 52 forming a part of the developingblade 51 further comprises a plurality ofholes 53 along theside edge 52B opposite to theside edge 52A. Thesupport member 52 forming a part of the developingblade 51 may be the same as thesupport member 12 forming a part of the aforesaid developingblade 11. -
FIG. 10 is illustrative in section, as inFIG. 2 , of a further embodiment of the mold assembly used with the inventive developing blade manufacturing method;FIGS. 10A , 10B and 10C are sectional views of the sites ofFIG. 1 as taken on lines A-A, B-B and C-C, respectively. Amold assembly 61 shown inFIGS. 10A , 10B and 10C are built up of atop mold 62 and abottom mold 63. Thetop mold 62 comprises amold surface 62A provided with acavity 64 for the formation of a blade member and arecess 68 into which a support member is to be inserted, an inlet port 65 (seeFIG. 10A ) provided in aback surface portion 64 a on one end side of thecavity 64 in the lengthwise direction (the direction coming out of the paper), agate 66 positioned at theinlet port 65 and a reservoir 67 (seeFIG. 10C ) provided in theback surface portion 64 a on the other end side of thecavity 64 in the lengthwise direction. The wall surface of thecavity 64 at the deepest site (the site deepest from themold surface 62A of the top mold 62) is curved and recessed. Therecess 68 for the insertion of the support member is conformed to the shape and thickness of thesupport member 72 such that oneend edge 72A of thesupport member 72 is positioned at the desired site of thecavity 64. On the other hand, thebottom mold 63 has aflat mold surface 63A. Thetop mold 62, too, has thecavity 64 sandblasted with an abrasive in the range of #150 to #1000. - It is noted that the
inlet port 65 and thereservoir 67 may be reversed in position in the lengthwise direction of thecavity 64, and that the depths, widths (in the lengthwise direction of the cavity 64) and lengths (in the direction orthogonal to the length direction of the cavity 64) of theinlet port 65 and thereservoir 67 may be determined as desired. - As shown, the
support member 72 is inserted into therecess 68 to position oneend edge 72A of thesupport member 72 at thecavity 64. In this state, suchtop mold 62 andbottom mold 63 are clamped together to pour the molding material from thegate 66. The pressure for clamping together thetop mold 62 and thebottom mold 63 may be set in the range of, for instance, 0.5 to 3 MPa per cavity. And the surface state of the sandblastedcavity 64 is reflected on the molding material filling in thecavity 64, whereby the blade member is formed on thesupport member 72, yielding the developing blade. The surface state of the blade member of the ensuing developing blade is going to have a fine asperity pattern on which the surface state of the sandblastedcavity 64 is reflected. - The molding material used herein may be the same as mentioned in conjunction with the aforesaid manufacturing method.
-
FIG. 11 is a perspective view of a further embodiment of the developing blade according to the invention. As shown inFIG. 11 , a developingblade 71 comprises asupport member 72, and ablade member 74 formed along oneside edge 72A of thesupport member 72 in such a way as to cover theside edge 72A. The area of contact of thatblade member 74 with the developing roller defines a curved surface. - The surface shape of the
blade member 74 of the developingblade 71 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 μm, preferably 0.35 to 4.0 μm, and a length ratio under load tp (at a 30% cut level) of 15% or lower, preferably 12% or lower. With the inventive developingblade 71 comprisingsuch blade member 74, it is possible to hold back an increase in its frictional resistance to the developing roller and allow the toner to be full electrified so that the toner in thin layer form is uniformly carried on the peripheral surface of the developing roller, even when that developing roller rotates at high speeds (of 24 rpm or more, for instance). - The material of the
blade member 74 forming a part of the developingblade 71 according to the invention may be the same as that of theblade member 14 forming a part of the aforesaid developing bladed 11. - Such inventive developing
blade 71 may be manufactured by the inventive manufacturing method using the aforesaidtop mold 62 andbottom mold 63. By manufacturing the developingblade 71 with the aforesaid inventive manufacturing method, theblade member 74 has on its surface a fine asperity pattern on which the surface state of the sandblastedcavity 64 is reflected. That fine asperity pattern has a maximum height roughness Ry of 0.35 to 4.5 μm and a length ratio under load tp (at a 30% cut level) of 15% or lower. - It is here noted that the
support member 72 forming a part of the developingblade 71 further comprises a plurality ofholes 73 along theend edge 72B opposite to theside edge 72A, and that thesupport member 72 forming a part of the developingblade 71 may be the same as thesupport member 12 forming a part of the aforesaid developingblade 11. -
FIG. 12 is illustrative in section, as inFIG. 2 , of a further example of the mold assembly used with the inventive developing blade manufacturing method;FIGS. 12A , 12B and 12C are sectional views of the sites corresponding to lines A-A, B-B and C-C ofFIG. 1 , respectively. Amold assembly 81 shown inFIGS. 12A , 12B and 12C is built up of atop mold 82 and abottom mold 83. - The
top mold 82 comprises amold surface 82A with acavity 84 formed for the formation of a blade member, an inlet port 85 (seeFIG. 12A ) provided in aback surface portion 84 a near one end of thecavity 84 in the length-wise direction (the direction coming out of the paper), agate 86 positioned at theinlet port 85 and a communication portion 88 (seeFIG. 12C ) provided in theback surface portion 84 a near the other end of thecavity 84 in the lengthwise direction. - Likewise, the
bottom mold 83 comprises amold surface 83A with acavity 84′ formed for the formation of a blade member, a reservoir 87 (seeFIG. 12A ) provided in aback surface portion 84′a near one end of thecavity 84′ in the lengthwise direction (the direction coming out of the paper), and acommunication portion 88′ (seeFIG. 12C ) provided in theback surface portion 84′a near the other end of thecavity 84′ in the lengthwise direction. - Such
top mold 82 andbottom mold 83, too, have thecavities - And the
support member 92 is inserted in such a place that thecavity 84 opposes thecavity 84′ with thesupport member 92 between them, thecommunication portion 88 opposes thecommunication portion 88′ with thesupport member 92 between them, and a through-hole 99 in thesupport member 92 is positioned at a site where thecommunication portions top mold 82 and thebottom mold 83 are clamped together. Thereafter, the molding material is poured from thegate 86 to fill in thecavities - Thus, the molding material poured from the
inlet port 85 at which thegate 86 is positioned flows through thecavity 84 in thetop mold 82 along a flow line indicated by a chain line inFIG. 13 , arriving at thecommunication portion 88. And, through the through-hole 99 in thesupport member 92 positioned here, it arrives at thecommunication portion 88′, whence it flows through thecavity 84′ in thebottom mold 83, flowing over it and arriving at thereservoir 87. For this reason, the flow of the molding material through thecavities reservoir 87 for degassing. - As noted above, the surface state of the sandblasted
cavities - It is here noted that the molding material used herein may be the same as mentioned in connection with the aforesaid manufacturing method.
-
FIG. 14 is illustrative of a further embodiment of the developing blade according to the invention;FIG. 14A is a front view and theFIG. 14B a back view.FIG. 15 is a sectional view of the developing blade ofFIG. 14 as taken on line A-A. As shown inFIGS. 14 and 15 , a developingblade 91 comprises asupport member 92, ablade member 94 formed at one surface of thesupport member 92 along oneside edge 92A, and ablade member 94′ formed at the other surface. - That
blade member 94 is formed along theside edge 92A of thesupport member 92, with its area of contact with a developing roller defining a curved surface. Further, there is askirt 95 near one end of theblade member 94 in the lengthwise direction (the direction indicated by an arrow a inFIG. 14 ), and there is askirt 98 near the other end. - The
blade member 94′ is formed along theside edge 92A in such a way as to oppose theblade member 94 with thesupport member 92 between them, and its area of contact with the developing roller defines a curves surface. Near one end of theblade member 94′ in the lengthwise direction (the direction indicated by an arrow a inFIG. 14 ), there is askirt 98′ formed in such a way as to oppose thatskirt 98 with thesupport member 92 between them. And in thesupport member 92 at a site where theskirts hole 99 present. - The surface shape of the
blade member blade 91 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 μm, preferably 0.35 to 4.0 μm, and a length ratio under load tp (at a 30% cut level) of 150 or lower, preferably 12% or lower. With the inventive developingblade 91 comprisingsuch blade members - The
support member 92 forming a part of the developingblade 91 further comprises a plurality ofholes 93 along theside edge 92B opposite to theside edge 92A.Such holes 93 may optionally be used for mounting, alignment or the like; they are never limited to what is illustrated in the drawings. - It is here noted that the material of the
blade member blade 91 may be the same as mentioned with reference to theblade member 14 forming a part of the aforesaid developingblade 11. -
FIG. 16 is illustrative in section, as inFIG. 2 , of a further example of the mold assembly used with the inventive developing blade manufacturing method;FIGS. 16A , 16B and 16C are sectional views of the sites corresponding to lines A-A, B-B and C-C ofFIG. 1 , respectively. Amold assembly 101 shown inFIGS. 16A , 16B and 16C is built up of atop mold 102 and abottom mold 103. - The
top mold 102 comprises amold surface 102A provided with acavity 104 for the formation of a blade member and arecess 108 into which the support member is to be inserted, an inlet port 105 (seeFIG. 16A ) provided in a back surface portion 104 a near one end of thecavity 104 in the lengthwise direction (the direction coming out of the paper), and agate 106 positioned at theinlet port 105. - Likewise, the
bottom mold 103 comprises amold surface 103A with acavity 104′ formed for the formation of a blade member, and a reservoir 107 (seeFIG. 16C ) provided in aback surface portion 104′a near one end of thecavity 104′ in the lengthwise direction (the direction coming out of the paper). - Such
top mold 102 andbottom mold 103, too, have thecavities - And while the
cavities support member 112 between them, thesupport member 112 is inserted into therecess 108 such that theend edge 112A of thesupport member 112 is positioned in a space where thecavities top mold 102 and thebottom mold 103 in alignment are clamped together. Thereafter, the molding material is poured from thegate 106 to fill in thecavities - Thus, the molding material poured from the
inlet port 105 at which thegate 106 is positioned flows concurrently through thecavity 104 in thetop mold 102 and thecavity 104′ in thebottom mold 103 along a flow line indicated by a chain line inFIG. 17 , flowing over them and arriving at thereservoir 107. For this reason, the flow of the molding material through thecavities reservoir 107 for degassing. - As noted above, the surface state of the sandblasted
cavities - It is here noted that the molding material used herein may be the same as mentioned in connection with the aforesaid manufacturing method.
-
FIG. 18 is illustrative of a further embodiment of the developing blade according to the invention;FIG. 18A is a front view and theFIG. 18B a back view.FIG. 19 is a sectional view of the developing blade ofFIG. 18 as taken on line A-A. As shown inFIGS. 18 and 19 , a developingblade 111 comprises asupport member 112, ablade member 114 formed at one surface of thesupport member 112 along oneside edge 112A, and ablade member 114′ formed at the other surface.Such blade members side edge 112A. That is to say, at the tip of the developingblade 111 theblade members blade member skirt 115 formed near one end of theblade member 114. - The surface shape of the
blade member blade 111 according to the invention is a fine asperity pattern having a maximum height roughness Ry of 0.35 to 4.5 μm, preferably 0.35 to 4.0 μm, and a length ratio under load tp (at a 30% cut level) of 15% or lower, preferably 12% or lower. With the inventive developingblade 111 comprisingsuch blade members - The
support member 112 forming a part of the developingblade 111 further comprises a plurality ofholes 113 along theside edge 112B opposite to theside edge 112A.Such holes 113 may optionally be used for mounting, alignment or the like; they are never limited to what is illustrated in the drawings. - It is here noted that the material of the
blade member blade 111 may be the same as mentioned with reference to theblade member 14 forming a part of the aforesaid developingblade 11. - The aforesaid embodiments are provided by way of illustration but not by way of limitation.
- The present invention is now explained in more details with reference to specific examples.
- A SUS 301 plate of 0.1 mm in thickness, 18 mm in width and 240 mm in length was readied up for the support member, and a liquid silicone rubber/curing agent mixture (LR3303 made by Asahi Kasei Wacker Co., Ltd.) was readied up for the molding material.
- With such injection mold assemblies as shown in
FIGS. 1 and 2 , on the other hand, each cavity was sandblasted with ten abrasives in the range of #80 to #1500 under the following conditions to prepare 10 injection mold assemblies. -
- Sandblasting Apparatus: Pressurized Blasting Apparatus (SGF-5 Type made by Fuji Seisakusho Co., Ltd.)
- Pressure: 4 kg/cm2
- Distance: 100 mm
- Angle: 90°
- Further, with such injection mold assemblies as shown in
FIGS. 1 and 2 , each cavity was blasted with four glass abrasives in the range of #80 to #320 under same conditions as mentioned above to prepare four injection mold assemblies. - Then, 14 such injection mold assemblies and the aforesaid support member were used to prepare 14 developing blades (
samples 1 to 14). - The blade member of each of the developing blades (
samples 1 to 14) prepared in this way was measured for the maximum height roughness Ry and the length ratio under load tp (at a 30% cut level). The results are set out in Table 1. -
- Measuring Apparatus: Surface roughness apparatus (Surfcom 2800E made by Tokyo Seimitsu Co., Ltd.)
(Conditions for Measuring the Length Ratio Under Load tp (at a 30% Cut Level)) - Reference Length: 0.8 mm
- Measuring Apparatus Surface roughness apparatus (Surfcom 2800E made by Tokyo Seimitsu Co., Ltd.)
- Each of the obtained developing blades (
samples 1 to 14) was mounted on a laser printer (HL5240 made by Brother Industries Co., Ltd.) to form images with the rotation speed of the developing roll set at 24 rpm. The thus formed images are observed in terms of density and streaks. The results are set out in Table 1. -
TABLE 1 DB* Abrasive** Ry*** tp**** (%) Estimation of Image Sample 1 Sand #1500 0.25 7 Streaks Sample 2 Sand #1200 0.29 9 Streaks Sample 3 Sand #1000 0.43 7 Good Sample 4 Sand #800 0.37 10 Good Sample 5 Sand #600 0.39 12 Good Sample 6 Sand #400 0.44 7 Good Sample 7 Sand #320 0.69 10 Good Sample 8 Sand #150 4.41 10 Good Sample 9 Sand #120 7.23 12 Low density Sample 10 Sand #80 11.20 7 Low density + Streaks Sample 11 Glass #320 1.34 21 Streaks Sample 12 Glass #200 2.04 23 Streaks Sample 13 Glass #100 3.03 22 Streaks Sample 14 Glass #80 3.65 29 Streaks DB*: Developing Blade Abrasive**: used for the blasting of the cavity in the mold used Ry***: Maximum height roughness tp****: Length ratio under load - As set out in Table 1, each of the developing blades (
samples 3 to 8) prepared using an injection mold assembly having a cavity sandblasted with an abrasive in the range of #150 to #1000 has a blade member having a maximum height roughness Ry of 0.35 to 4.5 μm and a length ratio under load tp (at a 30% cut level) of 150 or less, figures indicating that good enough images of sufficient density can be produced out of a high speed type laser printer. - The present invention is applicable to developing blades used on developers in electrophotographic imagers.
Claims (8)
1. A method for manufacturing a developing blade including a blade member located along one side edge of a support member, comprising the steps of:
providing a top mold comprising a mold surface with a cavity for formation of a blade member and a gate in communication with said cavity,
sandblasting the cavity with an abrasive in a range of #150 to #1000,
providing a bottom mold having a flat mold surface,
clamping together said top mold and said bottom mold while said top mold is in alignment with said bottom mold while at least a part of said support member is positioned in said cavity, and
pouring a molding material from said gate to fill said cavity.
2. The method for manufacturing a developing blade according to claim 1 , wherein said sandblasting is carried out using a pressurized blasting apparatus, and a ceramic abrasive is used for said abrasive.
3. The method for manufacturing a developing blade according to claim 1 , wherein said cavity has a wall surface curved and recessed at a deepest site.
4. The method for manufacturing a developing blade according to claim 1 , wherein said molding material is a liquid silicone rubber and curing agent mixture.
5. A method for manufacturing a developing blade including a blade member located on each surface of a support member along one side edge of said support member, comprising the steps of:
providing a top mold comprising a mold surface with a cavity for formation of a blade member and a gate in communication with said cavity,
sandblasting said cavity in said top mold with an abrasive in a range of #150 to #1000,
providing a bottom mold having a mold surface with a cavity for formation of a blade member,
sandblasting said cavity in said bottom mold with an abrasive in a range of #150 to #1000,
clamping together said top mold and said bottom mold while said top mold is in alignment with said bottom mold while said cavities oppose each other with said support member therebetween, and
pouring a molding material from said gate to fill said cavities.
6. The method for manufacturing a developing blade according to claim 5 , wherein said sandblasting is carried out using a pressurized blasting apparatus, and a ceramic abrasive is used for said abrasive.
7. The method for manufacturing a developing blade according to claim 5 , wherein said cavity has a wall surface curved and recessed at a deepest site.
8. The method for manufacturing a developing blade according to claim 5 , wherein said molding material is a liquid silicone rubber and curing agent mixture.
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US13/334,289 US20120091610A1 (en) | 2006-12-15 | 2011-12-22 | Developing blade and its manufacturing method |
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JP2007061458A JP5044245B2 (en) | 2006-12-15 | 2007-03-12 | Developing blade and manufacturing method thereof |
JP2007-061458 | 2007-03-12 | ||
US11/952,604 US8129014B2 (en) | 2006-12-15 | 2007-12-07 | Developing blade and its manufacturing method |
US13/334,289 US20120091610A1 (en) | 2006-12-15 | 2011-12-22 | Developing blade and its manufacturing method |
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US13/334,289 Abandoned US20120091610A1 (en) | 2006-12-15 | 2011-12-22 | Developing blade and its manufacturing method |
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US7655169B2 (en) * | 2005-06-10 | 2010-02-02 | Kabushiki Kaisha Bridgestone | Metal mold for manufacturing a developing blade |
JP4690926B2 (en) * | 2006-03-31 | 2011-06-01 | 藤倉ゴム工業株式会社 | Development blade |
JP4445488B2 (en) * | 2006-05-26 | 2010-04-07 | 藤倉ゴム工業株式会社 | Development blade |
JP5862322B2 (en) * | 2012-01-23 | 2016-02-16 | ブラザー工業株式会社 | Development device |
JP5834947B2 (en) | 2012-01-23 | 2015-12-24 | ブラザー工業株式会社 | Development device |
JP6376688B2 (en) * | 2014-07-24 | 2018-08-22 | 住友ゴム工業株式会社 | Semi-conductive roller |
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2007
- 2007-12-05 GB GB0723807A patent/GB2444829B/en active Active
- 2007-12-07 US US11/952,604 patent/US8129014B2/en active Active
-
2011
- 2011-12-22 US US13/334,289 patent/US20120091610A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4380966A (en) * | 1980-10-11 | 1983-04-26 | Canon Kabushiki Kaisha | Development apparatus |
US5697029A (en) * | 1995-04-11 | 1997-12-09 | Bridgestone Corporation | Magnet developing roller with dry plated sleeve |
US6083433A (en) * | 1997-03-05 | 2000-07-04 | Bridgestone Corporation | Cleaning blade and process for producing same |
US6078770A (en) * | 1997-05-07 | 2000-06-20 | Canon Kabushiki Kaisha | Toner-amount regulating elastic blade and developing device and apparatus unit using the same |
US20060267227A1 (en) * | 2005-05-10 | 2006-11-30 | Bridgestone Corporation | Production of blade for office appliances |
US20070065185A1 (en) * | 2005-09-20 | 2007-03-22 | Canon Kabushiki Kaisha | Developer regulating member and developing apparatus |
US20070114357A1 (en) * | 2005-10-17 | 2007-05-24 | Bridgestone Corporation | Mold for forming developer blade, and developer blade formed with same |
Also Published As
Publication number | Publication date |
---|---|
US20080145662A1 (en) | 2008-06-19 |
GB2444829A (en) | 2008-06-18 |
GB2444829B (en) | 2011-08-03 |
GB0723807D0 (en) | 2008-01-16 |
US8129014B2 (en) | 2012-03-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |