WO2017099223A1 - 剥離部材および剥離装置 - Google Patents
剥離部材および剥離装置 Download PDFInfo
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- WO2017099223A1 WO2017099223A1 PCT/JP2016/086750 JP2016086750W WO2017099223A1 WO 2017099223 A1 WO2017099223 A1 WO 2017099223A1 JP 2016086750 W JP2016086750 W JP 2016086750W WO 2017099223 A1 WO2017099223 A1 WO 2017099223A1
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- Prior art keywords
- peeling
- roller
- sheet
- release
- paper
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
Definitions
- the present invention relates to a peeling member for peeling paper from various rollers installed in an electrophotographic apparatus such as a copying machine or a laser beam printer, and more particularly to a peeling member for a fixing member such as a fixing roller. Moreover, it is related with the peeling apparatus provided with this peeling member.
- rollers are provided in electrophotographic apparatuses such as copying machines and laser beam printers for developing electrostatic latent images formed on photosensitive drums onto paper using a developer such as toner and then fixing them. It has been. Except for the photosensitive drum and the dry electrophotographic apparatus, the developing unit includes an oil application roller, and the fixing unit includes a fixing roller and a pressure roller. Conventionally, a photosensitive drum, a fixing roller, a pressure roller, and the like are provided with a separation claw to prevent a sheet from being wound around the roller and hindering smooth operation. The separation claw prevents the paper from being wound around the roller by scooping up the edge of the paper while sliding the tip of the separation claw on the outer peripheral surface of the roller.
- the width of the contact portion of the separation claw with the roller is about 1 to 10 mm, and 4 to 16 pieces are arranged for one roller. Since the separation claw is in local contact with the roller, the roller is inevitably partially worn and a good image cannot be obtained. Also, since the paper is locally contacted with the paper, it is easy to scrape off the developer transferred to the paper, and the paper that is scraped off may adhere to the separation claw and the paper may be easily soiled. .
- a peeling member capable of line contact with a roller of an electrophotographic apparatus a peeling sheet made of a thin metal plate that peels paper from the roller is joined to a metal support member by laser spot welding.
- a peeling member has been proposed (see Patent Document 1). This release member can be in line contact with the roller by a release sheet, and can prevent local wear of the roller.
- the peeling member of Patent Document 1 is a structure that supports the precision of the leading edge of the peeling sheet by supporting the peeling sheet, which is a thin plate, by a support member that is a metal base plate. Is possible. Moreover, since the support member and the release sheet are joined by laser spot welding, the joining force is thermally stabilized as compared with the case where the release sheet and the support member are joined by an adhesive. For this reason, generation
- the undulation phenomenon refers to a phenomenon in which the release sheet and the support member are partially peeled to cause undulations in the release sheet and the paper cannot be smoothly peeled off.
- Patent Document 2 since the peeling portion (tip portion) and the supporting portion thereof are made of the same metal plate, problems related to joining do not occur. However, in the metal plate, if the thin end portion (peeling portion) near the roller is long, when the thick paper jams, the portion may be greatly deformed by the thick paper. The same applies to a structure such as Patent Document 1 that uses a thin plate as a release sheet. Particularly in recent years, the printing speed has been increased, and it has become important to maintain the horizontal accuracy by preventing deformation of the tip.
- the present invention has been made to cope with such a problem, suppresses the wavy phenomenon of the release sheet, makes sufficient line contact with the roller, prevents deformation due to jamming of the paper, and is an excellent paper It aims at providing the peeling member which can exhibit peeling performance, and the peeling apparatus provided with this peeling member.
- the peeling member of the present invention supports a peeling sheet for peeling paper from a roller of an electrophotographic apparatus, the tilting sheet at a certain angle with respect to the roller, and a tip portion thereof close to the roller.
- a peeling member comprising the supporting member, and the peeling sheet is made of a single metal plate, and is fixed to the supporting member with a peeling portion constituting the tip portion and a thickness greater than the peeling portion.
- the peeling portion is provided on one long side of the metal plate, the sheet passing surface is a flat surface continuous with the surface of the supporting portion, and the anti-sheet passing surface is the peeling portion.
- the inclined surface is inclined with respect to the sheet passing surface so that the thickness of the peeling portion increases from the most distal portion toward the boundary with the support portion, and the inclined surface is a surface disposed on the roller side.
- rollers of the electrophotographic apparatus are, for example, a photosensitive drum, a fixing roller (including a belt roll), a pressure roller, and the like.
- the “distance between the most advanced portion and the roller” is the distance between the line segment and the roller surface when a line segment connecting the circle center of the roller and the most advanced portion is drawn in the radial cross section of the roller.
- the “distance between the boundary portion (the separation portion and the support portion) and the roller” means that when a line segment connecting the circle center of the roller and the boundary portion is drawn in the radial cross section of the roller, It means the length on the line segment between the intersection of the line segment and the roller surface (roller surface position) and the boundary.
- the boundary portion between the peeling portion and the support portion is a boundary portion between the inclined surface of the peeling portion and the anti-sheet passing surface of the support portion.
- the thickness of the most advanced portion is 0.05 mm to 0.4 mm, and the width of the inclined surface in the sheet passing direction is 1 mm to 10 mm.
- the inclined surface is an inclined flat surface, and an inclination angle with respect to the sheet passing surface is 5 ° to 45 °.
- the inclined surface has a shape imitating the surface of the roller adjacent to the inclined surface.
- the release sheet has a non-adhesive resin film attached to at least the paper passing surface of the release portion via a silicone-based adhesive, and the non-adhesive resin film comprises a polytetrafluoroethylene (PTFE) resin, tetrafluoro At least one fluororesin selected from ethylene-perfluoroalkyl vinyl ether copolymer (PFA) resin, tetrafluoroethylene-hexafluoropropylene copolymer (FEP) resin, and tetrafluoroethylene-ethylene copolymer (ETFE) resin It is a film.
- PTFE polytetrafluoroethylene
- FEP tetrafluoroethylene-hexafluoropropylene copolymer
- ETFE tetrafluoroethylene-ethylene copolymer
- the peeling device of the present invention is a peeling device comprising a roller of an electrophotographic apparatus and a peeling member, and the peeling member is a peeling sheet for peeling paper from the roller, And a support member that supports the tip of the release sheet by tilting it at a certain angle and close to the roller, and the release sheet is made of a single metal plate and constitutes the tip.
- a support part that is thicker than the peeling part and fixed to the support member, the peeling part being provided on one long side of the metal plate, and a sheet passing surface thereof being a surface of the support part
- an anti-sheet passing surface is an inclined surface inclined with respect to the sheet passing surface so that the thickness of the peeling portion increases from the foremost portion of the peeling portion toward the boundary with the support portion.
- the inclined surface is a surface arranged on the roller side Ri, a distance D1 between the leading edge portion and the roller, and the distance D2 between the boundary portion and the roller, and satisfies the D1 ⁇ D2 ⁇ 5 ⁇ D1.
- the peeling member of the present invention includes a peeling sheet for peeling the paper from the roller of the electrophotographic apparatus, a support member that supports the inclined sheet at a predetermined angle with respect to the roller, and the front end portion thereof close to the roller.
- the release sheet is made of a single metal plate having a thin release part and a thick support part, and the sheet passing surface of the release part is a flat surface continuous with the surface of the support part, Since the paper surface is an inclined surface inclined with respect to the paper passing surface, it can be easily inserted into the narrowest portion between the rollers or between the roller and the belt, and the releasability is excellent.
- the distance D1 between the foremost portion of the peeling portion and the roller and the distance D2 between the boundary portion of the peeling portion and the support portion and the roller satisfy D1 ⁇ D2 ⁇ 5 ⁇ D1, so in the narrowest portion,
- the thickness of the peeling portion that becomes the leading end portion of the peeling sheet can be made sufficiently thick, and even when the cardboard jams, the leading end portion can be prevented from being deformed.
- the peeling apparatus of this invention is equipped with the roller of an electrophotographic apparatus and the peeling member of the said structure, it has the said effect acquired by this peeling member.
- the release sheet consists of a single metal plate with a thin release part and a thick support part, a special jig such as laser welding and a laser generator are not required, and the release member can be manufactured at low cost. it can.
- there is no influence of heat there is no variation in the bonding force due to a problem when joining a plurality of members, and no undulation phenomenon occurs.
- the leading end portion (peeling portion) of the release sheet can be stably brought into contact with or close to the roller over a long period of time, and the paper can be smoothly peeled off.
- arc balls generated during laser welding are welded to the paper passing surface and the paper is caught.
- the thickness of the most advanced part is 0.05 mm to 0.4 mm, and the width of the inclined surface in the sheet passing direction is 1 mm to 10 mm. Can be prevented.
- the tip portion can be made as thick as possible and deformation due to jamming can be further prevented. .
- the non-adhesive resin film is affixed to the release sheet via a silicone adhesive at least on the paper passing surface of the release part, the release sheet can be firmly adhered to the release part and the adhesive effect can be maintained even at the fixing temperature. Excellent in high temperature durability. Moreover, the cushion effect by an adhesive can also be expected. Furthermore, since this non-adhesive resin film is at least one fluororesin film selected from PTFE resin, PFA resin, FEP resin, and ETFE resin, the effect of preventing adhesion of toner is very high and low friction with the paper. Excellent characteristics.
- FIG. 3 is a cross-sectional view (end view) of the peeling member in FIG. 2. It is a partial perspective view which shows the example which stuck the non-adhesive resin film to the peeling member of FIG. It is sectional drawing (end view) etc. of the peeling member of FIG.
- FIG. 6 is an enlarged view around a release sheet in the fixing device (inclined plane).
- FIG. 3 is an enlarged view around a release sheet in the fixing device (inclined curved surface). It is the schematic which shows the manufacturing process of the peeling member of this invention.
- FIG. 1 is a schematic diagram of a heat roller type fixing device using a peeling member.
- the fixing device includes a heater 6a, and includes a fixing roller 6 that rotates in the direction of arrow A, a pressure roller 7 that contacts the fixing roller 6 and rotates in the direction of arrow B, and the fixing roller 6 and the pressure roller 7 It is comprised from the peeling member 1 arrange
- the toner image formed on the paper 9 is fixed at the nip portion 8 and becomes a fixed image.
- the peeling member 1 includes a peeling sheet 10 for peeling the paper from the fixing roller 6 and a support member 11 that supports the peeling sheet 10.
- the support portion 3 of the release sheet 10 is fixed to the support member 11 with bolts 5.
- the support member 11 supports the release sheet 10 so as to be close to the fixing roller 6 while inclining the release sheet 10 at a predetermined angle with respect to the fixing roller 6. Thereby, the sheet 9 that has passed through the nip portion 8 can be peeled off from the fixing roller 6.
- This peeling member 1 is the peeling member of the present invention.
- the peeling device according to the present invention is a part of the fixing device, and includes a peeling member 1 and a roller (an fixing roller 6 in FIG. 1) of an electrophotographic apparatus that brings the peeling member 1 close thereto.
- FIG. 2 is a partial perspective view of the peeling member.
- 3A is a cross-sectional view (end view) including a recess for fixing a bolt of the release sheet
- FIG. 3B is a cross-sectional view (end view) of a portion without the recess.
- FIG. 3C is a partially enlarged view of FIG.
- the release sheet 10 is made of a single metal plate (substantially long flat plate), and includes a release portion 2 that constitutes the tip portion and a support portion 3 that is thicker than the release portion 2. It consists of.
- the planar shape of the release sheet 10 is substantially rectangular.
- the black arrow in the figure is the sheet passing direction, and the longitudinal direction of the release sheet 10 and the sheet passing direction are orthogonal to each other.
- the most distal portion 2a of the peeling portion 2 is the upstream side in the sheet passing direction, and is an end portion on the one long side of the peeling portion.
- the peeling portion 2 has a flat sheet passing surface 2b and does not have an uneven portion.
- the sheet passing surface 3 b of the support unit 3 is a flat surface that is continuous with the sheet passing surface 2 b of the peeling unit 2, and constitutes a sheet passing surface in the release sheet 10.
- the anti-paper passing surface of the peeling part 2 is the inclined surface 2c.
- the inclined surface 2c is an inclined plane inclined with respect to the sheet passing surface 2b so that the thickness of the peeling portion 2 increases at a constant rate from the most distal portion 2a of the peeling portion 2 toward the boundary portion 2d with the support portion 3. .
- the release sheet 10 is arranged with the inclined surface 2c of the release part 2 facing various rollers such as a fixing roller, and the most advanced part 2a is arranged near the roller. Pick up the edge of the paper peeled off (see FIG. 1).
- the peeling part 2 is formed by cutting one long side of a metal plate obliquely with a press, or cutting with a rolling or cutting tool, and the thickness continuously changes at a constant rate in the paper passing direction (short side direction). It is a taper part.
- the peeling part 2 has a constant thickness in the longitudinal direction.
- rolling obliquely with a press one long side is cut into a predetermined dimension with a press. At this time, it is preferable that both short sides are also cut into predetermined dimensions. Thereby, the deformation
- the thickness of the support part 3 is constant and is the thickness of the metal plate before processing.
- a plurality of concave portions 3 c that are fixing portions to the support member are formed at the end portion 3 a opposite to the peeling portion 2 (end portion on the downstream side in the paper passing direction) so as to be separated along the longitudinal direction.
- This recessed part 3c is formed in the range which does not hung on the peeling part 2 which is a taper part.
- the number and interval of the recesses 3c are set as appropriate.
- the recess 3c is formed by drawing or the like.
- the recess 3c has a shape opened to the outside of the end 3a.
- the longitudinally deformed portion of the recess 3c due to the drawing process is preferably cut to a predetermined size, and this does not deteriorate the accuracy of the support portion during the drawing process.
- the recess 3c has a bolt hole 3d for fixing the bolt, and the depth of the recess 3c is preferably deeper than the height of the head of the bolt (see FIG. 5 described later).
- the material of the metal plate constituting the release sheet 10 iron, aluminum, copper, stainless steel, or the like can be used.
- stainless steel is preferable because it does not rust, is easy to process, and is inexpensive.
- the thickness T2 (thickness of the metal plate) of the support part 3 is preferably in the range of 1 mm to 5 mm, and more preferably in the range of 1.3 mm to 2 mm.
- the width W in the sheet passing direction of the peeling portion 2 is preferably 1 mm to 10 mm, more preferably 1 mm to 7 mm, and still more preferably 3 mm to 5 mm.
- the peeling portion 2 in the drawing is a linear taper portion, and the inclined surface 2c is an inclined plane.
- the inclination angle ⁇ of the peeling portion 2 with respect to the sheet passing surface 2b in the inclined surface 2c is preferably in the range of 5 ° to 45 °, and more preferably in the range of 10 ° to 30 °.
- the thickness T1 of the most distal portion 2a of the peeling portion 2 is preferably 0.05 mm to 0.4 mm, and more preferably 0.1 mm to 0.4 mm. If the thickness T1 of the foremost portion is less than 0.05 mm, securing of the peeling force may be insufficient, and the non-adhesive resin film to be attached may be cut. On the other hand, when the thickness T1 of the foremost part exceeds 0.4 mm, the paper to be peeled may hit the foremost part of the peeling part, which may cause jamming.
- the peeling part 2 has a width substantially the same as the axial length of the roller.
- the length substantially the same as the axial length of the roller is at least about half or more of the axial length of the roller, and may be the same as or slightly longer than the axial length of the roller.
- the peeling portion 2 is applied with a lubricating coating or a non-adhesive resin film is applied to at least the paper passing surface of the most advanced portion 2a so as to improve the paper peeling performance.
- a non-adhesive resin film because of excellent paper peeling performance and high temperature durability.
- FIG. 4 and 5 show examples in which a non-adhesive resin film is attached to the release sheet of FIG.
- FIG. 4 is a partial perspective view of a release sheet to which a non-adhesive resin film is attached
- FIG. 5A is a cross-sectional view (end view) including a concave portion for fixing a bolt of the release sheet.
- FIG. 5C is a cross-sectional view (end view) including a support member.
- the non-adhesive resin film 4 is pasted from the paper passing surface 2 b to the inclined surface 2 c so as to cover the most distal end portion 2 a of the peeling portion 2. Further, the non-adhesive resin film 4 is stuck from the paper passing surface 2 b of the peeling portion 2 to the paper passing surface 3 b of the support portion 3.
- the non-adhesive resin film is a resin film having non-adhesiveness to such an extent that the developer can be prevented from adhering to it.
- a film made of a known fluororesin such as polychlorotrifluoroethylene resin, chlorotrifluoroethylene-ethylene copolymer resin, polyvinylidene fluoride resin, and polyvinyl fluoride resin can be used.
- a fluororesin film made of PTFE resin, PFA resin, FEP resin, or ETFE resin is excellent in non-adhesiveness to color toner (such as toner using a polyester binder resin) and has sufficient heat resistance.
- the non-adhesive resin film is formed from a non-adhesive resin blended with fine carbon powder such as ketjen black or acetylene black, thereby removing the paper due to static electricity. It is also possible to prevent a decrease in performance.
- the thickness of the non-adhesive resin film such as a fluororesin is preferably in the range of 10 to 200 ⁇ m, and more preferably in the range of 40 to 80 ⁇ m.
- the thickness is less than 10 ⁇ m, there is a risk of tearing due to friction with the developer, or there is a risk that the tip of the release sheet will be exposed due to slight wear. Moreover, it becomes easy to become a wrinkle in the sticking process to a peeling sheet, and handling becomes difficult.
- the thickness exceeds 200 ⁇ m the paper peeling performance deteriorates.
- the application of the non-adhesive resin film to the release sheet is preferably performed by interposing an adhesive, particularly a silicone adhesive, on the application surface.
- an adhesive particularly a silicone adhesive
- a non-adhesive resin film in which a silicone-based adhesive is previously attached to the surface to be attached to the release sheet is used.
- the silicone-based pressure-sensitive adhesive include pressure-sensitive adhesives obtained by condensing a copolymer composed of SiO 2 units and (CH 3 ) 3 SiO units and diorganopolysiloxane raw rubber.
- the thickness of the silicone pressure-sensitive adhesive layer may be in the range of 5 to 50 ⁇ m. If the thickness is less than 5 ⁇ m, a sufficient adhesion effect cannot be obtained. On the other hand, if the thickness is larger than 50 ⁇ m, the thickness of the release sheet is relatively increased, and the paper release performance may be deteriorated.
- the non-adhesive resin film can be attached to the peeling portion without interposing an adhesive. For example, after roughening the sticking surfaces (paper passing surfaces 2b, 3b) in the release sheet by plasma etching or the like, a method of heat-pressing a non-adhesive resin film can be mentioned.
- the support portion 3 of the release sheet 10 is fixed to the support member 11 with bolts 5.
- the bolt 5 is fixed to the support member 11 through the bolt hole 3 d of the recess 3 c of the support portion 3.
- the release sheet is a mere thin plate or the like, it is necessary to support the vicinity of the front end portion with a support member in order to ensure the accuracy of the front end portion to be brought close to the roller.
- the release sheet 10 in the present invention is an integral part of the release part 2 and the support part 3, if only the support part 3 is supported by the support member 11, the release part 2 can be stably formed. Supported. For this reason, the horizontal accuracy of the most advanced portion 2a of the peeling portion 2 that greatly affects the peeling performance can be maintained high, and excellent paper peeling performance can be exhibited.
- the release member of the present invention supports the release sheet described above at a predetermined angle with respect to the roller by the support member, the distance D1 between the most distal portion of the release portion and the roller in the release sheet, and the boundary portion between the release portion and the support portion.
- the distance D2 between the roller and the roller satisfies a predetermined relationship (D1 ⁇ D2 ⁇ 5 ⁇ D1). This relationship will be described with reference to FIG.
- FIG. 6 is an enlarged view around the release sheet in the fixing device.
- the release sheet 10 is supported so that the release portion 2, which is the leading end thereof, is close to the fixing roller 6 while being inclined at a predetermined angle with respect to the fixing roller 6.
- the distance D1 between the foremost portion 2a of the peeling portion 2 and the fixing roller 6 and the distance D2 between the boundary portion 2d of the peeling portion 2 and the support portion 3 and the fixing roller 6 satisfy D1 ⁇ D2 ⁇ 5 ⁇ D1.
- the distance D1 is the intersection X between the line segment and the roller surface, and the maximum distance D1.
- the distance D2 is the intersection Y between the line segment and the roller surface when the line segment connecting the circle center of the roller and the boundary part 2d is drawn on the radial cross section of the fixing roller 6 and the boundary part 2d.
- the length on the line segment between Moreover, when the non-adhesive resin film 4 is stuck to the peeling part 2, it is made to satisfy
- the above-mentioned shape / dimension and support angle of the release sheet are adjusted in the release member so as to satisfy such a relationship.
- the peeling portion 2 is prevented from coming into contact with the fixing roller 6 between the most advanced portion 2a and the boundary portion 2d.
- the inclined surface 2 c of the peeling portion 2 is substantially parallel to the tangent L at the intersection point X, which is the closest point of the fixing roller 6 to the peeling sheet 10, or from substantially parallel to D ⁇ b> 2> If it inclines to the side used as D1, the said contact can be prevented.
- FIG. 7 corresponds to FIG. 6 and is an enlarged view around the release sheet in the fixing device.
- the release sheet 10 of this embodiment has a shape in which the inclined surface 2 c of the release portion 2 follows the surface 6 b close to the inclined surface of the fixing roller 6 while satisfying the above relationship between D ⁇ b> 1 and D ⁇ b> 2.
- the inclined surface 2c and the proximity surface 6b are substantially parallel, and the gap width between both surfaces is substantially constant over the entire inclined surface 2c.
- Example 1 A peeling member was manufactured by processing a stainless steel (SUS304CSP) coil having a thickness of 1.5 mm into a predetermined size using a progressive press die and then machining the tip into a tapered shape by machining.
- a manufacturing process is demonstrated based on FIG.
- FIG. 8 is a schematic view of the manufacturing process.
- (A) to (F) are approximate processing orders.
- the outer dimension of the release sheet was punched out with a press die on the steel plate 20 shown in (A), and then the recess 3c was formed by drawing shown in (B).
- the bolt holes 3d for fixing the bolts were punched with a press die, and in (D), the throttle portion was cut to a predetermined size.
- the release sheet 10 ′ before taper formation was punched from the steel plate 20.
- the sheet passing side opposite to the narrowed portion was cut into a tapered shape by machining and then ground to obtain a release sheet 10 having a tapered release portion 2 and a support portion 3.
- the release sheet 10 had a thickness of 0.2 mm at the foremost part and a width in the paper passing direction of the release part of 5 mm.
- a fluororesin film was attached to the paper passing surface and the inclined surface of the peeling portion 2 and the paper passing surface of the support portion 3.
- a fluororesin film a PTFE film having a thickness of 50 ⁇ m (Bearly FL3090 manufactured by NTN Precision Resin Co., Ltd.) was prepared, and an etching process was performed in which the surface to be attached to the peeling member was immersed in an ammonia solution of metallic sodium.
- a silicone-based pressure-sensitive adhesive solution containing dimethylpolysiloxane raw rubber KR101 manufactured by Shin-Etsu Chemical Co., Ltd.
- the fluororesin film is laid on a smooth plate so that the surface having the adhesive layer is face-up so as not to become wrinkles.
- a roller proximity part (the most advanced part of the peeling part) with rounded corners was arranged in the substantially central part of the fluororesin film.
- the film was affixed to the surface of the peeling portion with this roller proximity portion as a boundary. In this way, a release sheet was obtained in which the fluororesin film was bonded via the silicone adhesive as shown in FIG.
- Example 2 As in Example 1, a stainless steel (SUS304CSP) coil having a thickness of 1.5 mm was processed to a predetermined size with a progressive press die, and then the thickness of the tip portion was processed to 0.3 mm by machining to form a peeling member. Manufactured.
- the stamping process in the press die is the processing order of (A) to (E) in FIG. 8. After punching the release sheet 10 ′ from the steel plate 20 after processing with the press die, the punching process is performed on the side opposite to the drawn portion in (F).
- the taper-shaped tip portion obtained by grinding the non-paper passing side into a taper shape by machining is cut in the longitudinal direction with a press to increase the accuracy of straightness, and a release sheet 10 having the release portion 2 and the support portion 3 is obtained. It was.
- this release sheet 10 the thickness of the most advanced portion was 0.3 mm, and the width of the release portion in the paper passing direction was 4 mm.
- release sheets were set together with a supporting member in a fixing portion of a test copying machine (fixing temperature 190 ° C., A4 copying speed 57 sheets / min).
- fixing temperature 190 ° C., A4 copying speed 57 sheets / min.
- the distance D1 between the foremost portion of the release portion and the fixing roller is 0.4 mm, and the boundary portion between the release portion and the support portion and the fixing roller
- the distance D1 between the foremost portion of the peeling portion and the fixing roller is 0.2 mm
- test copying machines Using these test copying machines, a line chart with an image ratio of 30% was used as a manuscript, and A4 plain paper was used to perform a copying test with 5000 continuous sheets up to 30000 sheets. The test machine was stopped every 5000 sheets and the presence or absence of image degradation was confirmed by visual observation of the copied paper. Further, the peeling member was removed from the fixing portion, and the wear of the fluororesin film, the presence or absence of toner adhesion, and the wear state of the fixing roller were confirmed.
- Example 1 and Example 2 showed no image degradation until the end of the 30000 sheet passing test, and the fluororesin film confirmed after the end of the sheet passing test was not damaged. Further, no toner adhered to the peeled portion, and no wear of the fixing roller was observed. Further, no deformation due to jamming was observed.
- Example 1 A thin metal plate (peeling sheet) made of stainless steel (SUS304CSP) having a thickness of 200 ⁇ m was cut into a length of 310 mm and a width of 25 mm, and the inner width of 5 mm and the length of 310 mm were bent at a right angle. Next, recesses were provided at five locations on the bent metal sheet so that the bolt heads did not completely protrude from the 20 mm wide surface of the metal sheet, and bolt holes were provided on the bottom surface of the recess.
- the thin plate and the metal support plate were joined to each other with RTV-KE1800ABC made by Shin-Etsu Chemical, which is a silicone rubber adhesive, and a fluororesin film was attached in the same manner as in Example 1. The same evaluation as in Example 1 was performed. When the test was conducted, the entire joint of the release sheet was peeled off.
- Comparative Example 2 The release sheet was manufactured by the same manufacturing method as in Example 2, and the tip portion was finished to a thickness of 0.35 mm. A fluororesin film was attached in the same manner as in Example 1.
- the release sheet of Comparative Example 2 was set together with a support member in a fixing portion of a test copying machine (fixing temperature 190 ° C., A4 copying speed 57 sheets / min).
- the distance D1 between the foremost portion of the peeling portion and the fixing roller is 0.3 mm
- the distance D2 between the boundary portion between the peeling portion and the supporting portion and the fixing roller is 2.0 mm
- the peeling member of the present invention suppresses the undulation phenomenon of the peeling sheet, can make sufficient line contact with the roller, can prevent deformation due to jamming of paper, and can exhibit excellent paper peeling performance. It can be suitably used as a peeling member for peeling paper from various rollers such as a fixing roller installed.
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Abstract
Description
厚さ1.5mmのステンレス(SUS304CSP)コイルを順送プレス型にて所定の寸法に加工後、機械加工にて先端部をテーパー状に加工して剥離部材を製造した。製造工程を図8に基づき説明する。図8は製造工程の概略図である。(A)~(F)は概略の加工順である。まず、(A)に示す鋼板20上に剥離シートの外寸をプレス型で打ち抜き、次に(B)に示す絞り加工で凹部3cを形成した。次に(C)でボルト固定用のボルト穴3dをプレス型で打ち抜き、(D)で絞り部を所定の寸法にカットした。その後(E)で鋼板20よりテーパー形成前の剥離シート10’を打ち抜いた。最後に(F)で絞り部と反対側の反通紙側を機械加工でテーパー状に切削後、研削し、テーパー状の剥離部2と、支持部3とを有する剥離シート10を得た。この剥離シート10は、最先端部の厚みが0.2mm、剥離部の通紙方向の幅が5mmであった。
実施例1と同様に厚さ1.5mmのステンレス(SUS304CSP)コイルを順送プレス型にて所定の寸法に加工後、機械加工にて先端部の厚みを0.3mmに加工して剥離部材を製造した。プレス型での打ち抜き工程は図8の(A)~(E)の加工順であるが、プレス型で加工後鋼板20より剥離シート10‘を打ち抜いた後に(F)で絞り部と反対側の反通紙側を機械加工でテーパー状に研削したテーパー状の先端部をプレスにて長手方向に切断して真直度の精度を上げ、剥離部2と支持部3とを有する剥離シート10を得た。この剥離シート10は、最先端部の厚みが0.3mm、剥離部の通紙方向の幅が4mmであった。
厚さ200μmのステンレス(SUS304CSP)からなる金属薄板(剥離シート)を長さ310mm、幅25mmにカットしてその内幅5mm長さ310mmを直角に曲げた。次に曲げた側の金属薄板の5ヶ所にボルトの頭が、完全に金属薄板の20mm幅の面より出ない程度に凹部を設け、凹部の底面にボルト穴を設けた。この薄板と金属支持板とを、シリコンゴム系接着剤である信越化学製RTV-KE1800ABCにて相互に接合し、実施例1と同じようにフッ素樹脂フィルムを貼り付け、実施例1と同一の評価試験を行なったところ、剥離シートの接合部全体が剥がれてしまった。
実施例2と同様の製造方法で試作した剥離シートで、先端部の厚みは0.35mmに仕上げられ、実施例1と同様の方法でフッ素樹脂フィルムを貼付した。この比較例2の剥離シートを支持部材とともに試験用複写機(定着温度190℃、A4複写速度57枚/分)の定着部にセットした。比較例2では、剥離部の最先端部と定着ローラとの距離D1が0.3mmであり、剥離部と支持部の境界部と定着ローラとの距離D2が2.0mmであり、D2>5×D1であった。
2 剥離部
3 支持部
4 非粘着性樹脂フィルム
5 ボルト
6 定着ローラ
7 加圧ローラ
8 ニップ部
9 用紙
10 剥離シート
11 支持部材
20 鋼板(金属板)
Claims (6)
- 電子写真装置のローラから用紙を剥離するための剥離シートと、前記ローラに対して前記剥離シートを一定の角度で傾斜させ、その先端部を前記ローラに近接させて支持する支持部材とを備えてなる剥離部材であって、
前記剥離シートは、一枚の金属板からなり、前記先端部を構成する剥離部と、該剥離部よりも肉厚で前記支持部材に固定される支持部とを有し、
前記剥離部は、前記金属板の一長辺側に設けられ、その通紙面が前記支持部の表面と連続した平面であり、その反通紙面が該剥離部の最先端部から前記支持部との境界部に向かい該剥離部の厚みが増加するように前記通紙面に対して傾斜した傾斜面であり、
前記傾斜面が、前記ローラ側に配置される面であり、前記最先端部と前記ローラとの距離D1と、前記境界部と前記ローラとの距離D2とが、D1≦D2≦5×D1を満たすことを特徴とする剥離部材。 - 前記剥離部において、前記最先端部の厚みが0.05mm~0.4mmであり、前記傾斜面の通紙方向幅が1mm~10mmであることを特徴とする請求項1記載の剥離部材。
- 前記剥離部において、前記傾斜面が傾斜平面であり、前記通紙面に対する傾斜角度が5°~45°であることを特徴とする請求項1記載の剥離部材。
- 前記傾斜面が、前記ローラにおける該傾斜面との近接表面に倣った形状であることを特徴とする請求項1記載の剥離部材。
- 前記剥離シートは、少なくとも前記剥離部の通紙面にシリコーン系粘着剤を介して非粘着性樹脂フィルムが貼付されてなり、
前記非粘着性樹脂フィルムは、ポリテトラフルオロエチレン樹脂、テトラフルオロエチレン-パーフルオロアルキルビニルエーテル共重合体樹脂、テトラフルオロエチレン-ヘキサフルオロプロピレン共重合体樹脂、およびテトラフルオロエチレン-エチレン共重合体樹脂から選ばれる少なくとも一つのフッ素樹脂フィルムであることを特徴とする請求項1記載の剥離部材。 - 電子写真装置のローラと剥離部材とを備えてなる剥離装置であって、
前記剥離部材は、前記ローラから用紙を剥離するための剥離シートと、前記ローラに対して前記剥離シートを一定の角度で傾斜させ、その先端部を前記ローラに近接させて支持する支持部材とを有し、
前記剥離シートは、一枚の金属板からなり、前記先端部を構成する剥離部と、該剥離部よりも肉厚で前記支持部材に固定される支持部とを有し、
前記剥離部は、前記金属板の一長辺側に設けられ、その通紙面が前記支持部の表面と連続した平面であり、その反通紙面が該剥離部の最先端部から前記支持部との境界部に向かい該剥離部の厚みが増加するように前記通紙面に対して傾斜した傾斜面であり、
前記傾斜面が、前記ローラ側に配置される面であり、前記最先端部と前記ローラとの距離D1と、前記境界部と前記ローラとの距離D2とが、D1≦D2≦5×D1を満たすことを特徴とする剥離装置。
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