Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
  • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
  • G03G21/1604—Arrangement or disposition of the entire apparatus
  • G03G21/1619—Frame structures
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
  • B41J29/02—Framework

Definitions

• the present invention relates to an image forming apparatus such as an electrophotographic copying machine, an electrophotographic printer (laser beam printer and LED printer, for example).
• an electrophotographic printer laser beam printer and LED printer, for example.
• bent portions 161a, 171a and 181a are formed by bending a fixation stay 161 for supporting a fixing apparatus, an optics stay 171 for supporting a laser scanner unit, and a main stay 1 18 for supporting a sheet conveyance system, respectively, along their edges.
• the bent portions 161a, 171a, and 181 a are welded to the right and left plates 151 and 141 , at points W to yield a frame 126 (Japanese Laid-open Patent Application No. 2015-163959).
• the metallic stay 202 is connected to the left and right plates 200 and 201 (Japanese Laid-open Patent Application No. 2013-109141). Also in this case, the metallic stay 202 is provided with a main portion 202a which horizontally extends, and a pair of connective portions 202b which are perpendicular to the lengthwise ends of the main portion 202a, one for one. More specifically, the connective portion 202b is put through a through hole 200a, with which the left plate 200 is provided. Then, it is held to the left plate 200 with small screw 203.
• a frame made up of a combination of two or more pieces of metallic plate are superior to a molded one-piece frame, in that the former is more precisely formable in dimension, and also, that the pieces of metallic plate, of which the former is made, are flat, and therefore, are easier to ship than the latter.
• the bent portions 161 a, 171 a and 1 81 a change in their angle relative to the main portions of the fixation stay 161 , optics stay 171, and main stay 181 , respectively
• the members of the image forming apparatus which are supported by the frame, change in their positional relationship to each other.
• the laser scanner unit and photosensitive drum change in their positional relationship. Consequently, the image forming apparatus is negatively affected in image quality. That is, the image forming apparatus outputs such images that are deformed and/or suffer from color deviation.
• the present invention was made in consideration of the problem described above.
• the object of the present invention is to provide an image forming apparatus, which is substantially smaller in the amount of deformation of its frame made up of a combination of two or more pieces of metallic plate, than any conventional image forming apparatus.
• a n image forming apparatus comprising a first metal plate provided with a through hole; a second metal plate provided opposed to said first metal plate; a third metal plate provided between said first metal plate and said second metal plate; and a fixing member fixing said first metal plate and said third metal plate to each other, wherein said fixing member has a first surface and a second surface extending in a direction crossing said first surface, wherein said third metal plate extends outward in a direction in which said first metal plate and said second metal plate opposes to each other, and said third metal plate is provided with a first projection penetrating said through hole, and wherein said first projection is fixed on said first surface, and wherein said first metal plate is fixed on said second surface of said fixing member.
• Figure 1 is a perspective view of the image forming apparatus in the first embodiment of the present invention.
• Figure 2 is a schematic sectional view of the image forming apparatus shown in Figure 1.
• Figure 3 is a perspective view of the frame of the image forming apparatus shown in Figure 1.
• Figure 4 is a schematic sectional view of the frame of the image forming apparatus shown in Figure 1.
• Figure 5 is a perspective view of a combination of the fixation stay, optics stay, and main stay of the image forming apparatus shown in Figure 1.
• Figure 6 is a combination of a perspective view the frame shown in Figure 3, and an enlarged perspective view of one of the L-angles of the frame.
• Figure 7 is a schematic sectional view of the portions of the frame in the first embodiment, to which the present invention concerns.
• Figure 8 is a perspective view of the frame.
• Figure 9 is a schematic sectional view of the frame.
• Figure 10 is a perspective view of another frame.
• Figure 1 1 is a sectional view of another frame.
• Figure 12 is a perspective view of the frame.
• Figure 13 is a perspective view of the frame.
• Figure 14 is a perspective view of the frame.
• Figure 15 is s a perspective view of the frame.
• Figure 16 is a perspective view of a typical conventional frame for an image forming apparatus.
• Parts (a), (b) and (c) of Figure 17 are perspective views of a typical conventional frame for an image forming apparatus.
• Parts (a) and (b) of Figure 18 are perspective views of a typical conventional frame for an image forming apparatus.
• Figure l is a perspective view of the image forming apparatus A in this embodiment.
• Figure 2 is a schematic sectional view of the image forming apparatus A.
• the image forming apparatus A has: an image forming portion 99 which forms an image on a sheet S of recording medium) by transferring a toner image onto the sheet; and a feeding unit 18 which delivers a sheet of recording medium to the image forming portion 99; and a fixing apparatus 21 which fixes a toner image to a sheet of recording medium.
• the feeding unit 18 has: a sheet cassette 19 in which sheets of recording medium are stored in layers; and a feed roller 20.
• the feed roller 20 feeds the sheets of recording medium into the main assembly of the image forming apparatus A from the sheet cassette 19.
• the image forming portion 99 has process cartridges P (PY, PM, PC and PK), an intermediary transfer unit 11 , a laser scanner unit 90, primary transfer rollers 16 (16Y, 16M, 16C and 16K), etc.
• Each process cartridge P has a photosensitive drum 10 (10Y, 10M, 10C or 10K), a charge roller 92 (92 Y, 92M,
• the intermediary transfer unit 1 1 has an intermediary transfer belt 12, a tension roller 13, a secondary transfer roller 14, an assist roller 16, and a backup roller 17 which opposes the secondary transfer roller 17.
• the intermediary transfer belt 12 is suspended by the tension roller 13, backup roller 17, and assist roller 15 in such a manner that it bridges between the adjacent two rollers. It is a flexible endless belt. It is circularly moved by the rotation of the backup roller 17.
• the frame 26 ( Figure 3) of the image forming apparatus A is covered with a casing 2.
• the front side of the image forming apparatus A is provided with a cover 3, which can be opened or closed by being rotationally moved relative to the main assembly of the image forming apparatus A.
• the image forming operation of the image forming apparatus A is described.
• the unshown controlling portion of the image forming apparatus A receives an image formation job signal, the layered sheets S of recording medium in the sheet cassette 19 are conveyed by a combination of a feed roller 20 and a pair of conveyance rollers 95a and 95b, to a secondary transferring portion formed by the secondary transfer roller 14 and backup roller 17.
• the peripheral surface of the photosensitive drum 10, as a photosensitive member is uniformly charged by the charge roller 92.
• the laser scanner unit 90 as an exposing portion, scans the uniformly charged portion of the peripheral surface of the
• the intermediary transfer belt 12 circularly moves, the toner image is sent to the secondary transferring portion by the belt 12.
• bias is applied to the secondary transfer roller 14.
• the toner image on the intermediary transfer belt 12 is transferred onto the sheet S.
• the sheet S After the transfer of the toner image onto the sheet S, the sheet S is heated, while being pressed, by the fixing apparatus 21. Consequently, the toner image on the sheet S is fixed to the sheet S. Thereafter, the sheet S is discharged into a delivery portion 23 by a pair of discharge rollers 22.
• Figure 3 is a perspective view of the frame 26 of the image forming apparatus A.
• Figure 4 is a schematic sectional view of the frame 26.
• the primary structural components of the frame 26 are the left plate 41 , right plate 51 , fixation stay 61 , optics stay 71 , and main stay 81 .
• These members are made of metallic plate which is 21x10 kgf/mm in Young’s modulus, 0.30 in Poisson’s ratio, and 0.8 mm in thickness. They were formed into their appropriate shapes by pressing or the like method. The measurements of these members are as shown in Figure 4.
• the left plate 41 as the first plate, and the right plate 51 as the second plate, are positioned so that they are roughly parallel to each other, and oppose each other.
• the left plate 41 is provided with a pair of through holes 41 a and 41b.
• the right plate 51 is provided with a pair of through holes 51 a and 51b.
• the fixation stay 61 as the fourth metallic plate, optics stay 71 as the fifth metallic plate, and main stay 81 as the third metallic plate are positioned between the left plate 41 and right plate 51 in terms of the direction of the rotational axis of the photosensitive drum 10. They are in connection to the left plate 41 and right plate 51.
• the optics stay 71 as the fifth metallic plate is a member for supporting the laser scanner unit 90.
• the main stay 81 as the third metallic plate is a member for supporting the intermediary transfer unit 1 1 and connector 18.
• the fixation stay 61 as the fourth metallic plate is a member for supporting the fixing apparatus 21.
• an L-angle 31 which is a fixing member, and also, the first fixing member, is fixed.
• an L-angle 36 as the second fixing member ( Figure 8) is fixed. The structure and function of the L-angles 31 and 36 are described later.
• Figure 5 is a perspective view of a combination of the fixation stay 61 , optics stay 71 and main stay 81.
• the fixation stay 61 , optics stay 71 as the fifth metallic plate, and main stay 81 are provided with bent portions 61a, 71 a and 81a, which were bent so that after their insertion into the through holes 41 a, 41b, 51 a and 51 b, respectively, they will be roughly parallel to the left plate 41 as the first metallic plate, and right plate 51 as the second metallic plate..
• the bent portion 61 a of the fixation stay 61 , bent portion 71 a of the optics stay 71 , and bent portion 81 a of the main stay 81 are spot- welded to left plate 41 as the first metallic plate 41 , right plate 51 as the second metallic plate, at spots W ( Figure 3, etc.), whereby the fixation stay 61 as the fourth metallic plate, optics stay 71 as the fourth metallic plate as the fifth metallic plate, and main stay 81 as the third metallic plate, are connected to the left plate 41 and right plate 51.
• the fixation stay 61 as the fourth metallic plate has a perpendicular portion 61b, which is perpendicular to the main portion of the fixation stay 61.
• Each of the lengthwise end portions of the vertical portion 61b is outwardly protrusive beyond the corresponding bent portion 61 a.
• the main stay 81 as the third metallic plate has a portion 81b which is vertical and coincides with the vertical portion 61 b.
• Each of the lengthwise end portions of the vertical portion 81 b is outwardly protrusive beyond the corresponding bent portion 81 a.
• FIG. 6 is a combination of a perspective view of the frame 26, and an enlarged perspective view of one of the L-angles 31.
• each of L-angles 31 which is a fixing member as well as the first fixing member, has the first fixing portion 31 a, which is parallel to the portion of the left plate 41 , which is provided with the through holes 41 a and 41 b.
• the first fixing portion 31a is fixed to the left plate 41.
• the first fixing portion 31 a is fixed to the opposite surface of the left plate 41 from the right plate 51.
• It has the second fixing portion 31b, which is intersectional to the portion of the left plate 41 , which is provided with the through holes 41 a and 41 b.
• the second fixing portion 31 b as the second portion is perpendicular to the first fixing portion 31a as the first portion. It is perpendicular to the portion of the left plate 41 , which is provided with the through holes 41 a and 41 b.
• the vertical portion 61b of the fixation stay 61 is outwardly put through the through hole 41 a of the left plate 41 , and is fixed to the second fixing portion 31b of the L-angle 31 which is also the first fixing member.
• the vertical portion 61b is parallel to the second fixing portion 3 lb as the second portion. Therefore, the second fixing portion 31b as the second portion, and vertical portion 61b, form such a portion that is parallel to the normal line to the left plate 41 which is provided with the through holes 41 a and 41b.
• the vertical portion 81b of the main stay 81 is outwardly put through the through hole 41b of the left plate 41 , and is fixed to the second fixing portion 3 lb of the L-angle 31 , which is a fixing member and the first fixing member as well.
• the vertical portion 81 b is such a portion that is parallel to the second fixing portion 3 lb as the second portion. Therefore, the vertical portion 81b, and second fixing portion 3 lb as the second portion, form such a portion that is parallel to the normal line to the left plate 41 , which is provided with the through holes 41 a and 41 b.
• the L-angle 36 shown in Figure 8 is the same in structure as the L- angle 31. That is, the L-angle 36 as the second fixing member, has the first fixing portion 36a as the third surface portion, which is parallel to the right plate 51 , which is provided with the through holes 51 a and 51b, and is fixed to the right plate 51.
• the first fixing portion 36a is fixed to the opposite surface of the right plate 51 from the left plate 41.
• it has the second fixing portion 36b as the fourth portion, which is intersectional to the portion of the right plate 51 , which has the through holes 51 a and 51b.
• the second fixing portion 36b as the fourth portion is such a portion that is perpendicular to the first fixing portion 36a as the third portion. It is perpendicular to the portion of the right plate 51 , which is provided with the through holes 51 a and 51b.
• the vertical portion 61b of the fixation stay 61 is outwardly protrusive through the through hole 51 a, and is fixed to the second fixing portion 36b of the L-angle 36 as the second fixing member.
• the vertical portion 61b is such a portion that is parallel to the second fixing portion 36b as the fourth portion.
• a.combination of the vertical portion 81b and second fixing portion 36b forms a portion that is normal to the portion of the right plate 51, which is provided with the through holes 51 a and 51b.
• the vertical portion 81b of the main stay 81 is outwardly protrusive beyond the right plate 51 through the through holes 51a and 51b of the right plate 51. It is fixed to the second fixing portion 36b of the L-angle 36 as the second fixing member.
• the vertical portion 81b is parallel to the second fixing portion 36b as the fourth portion. Therefore, a combination of the vertical portion 81b and second fixing portion 36b forms such a portion that is normal to the portion of the right plate 51 , which is provided with the through holes 51a and 51b.
• Figure 7 is a schematic sectional view of the frame 26 at a plane which is in the adjacencies of the second fixing portion 31 b of the L-angle 31. It is assumed there that an external force FI acts upon a point K1 of the top edge portion of the right plate 51 , in the thickness direction (indicated by arrow mark Y) of the right plate 51 .
• the bent portions 61 a, 71a and 81a are subjected to the external force F1 which is parallel to the thickness direction of the bent portions 61 a, 71 a and 81 a.
• these portions deform, and change in angle.
• fixation stay 61 , optics stay 71 , and main stay 81 change in position relative to the left plate 41 and right plate 51. Further, the force bearing point K1 of the right plate 51 moves in the direction indicated by the arrow mark Y. As they change in position relative to the left plate 41 and right plate 51 , the image forming apparatus A changes in the positional relationship between the laser scanner unit 90 as the exposing portion, and therefore, is likely to output unsatisfactory images.
• the frame 26 is provided with the L- angle 31 and L-angle 36, and the vertical portion 81b of the main stay 81 is fixed to the second fixing portions 31b and 36b of the L-angles 31 and 36, respectively, as described above. Therefore, as the point K1 is subjected to the external force FI , which is perpendicular to the thickness direction of the right plate 51 , it is borne by the combination of the second fixing portion 31b, second fixing portion 36b, vertical portion 61b, and vertical portion 81b, which resists the external force FI , which is perpendicular to the thickness direction of these portions.
• Figure 8 is a perspective view of the frame 26.
• Figure 9 is a schematic sectional view of the frame 26. Referring to Figures 8 and 9, it is assumed there that a point K2, which is a part of the bottom edge portion of the right plate 51 is subjected to an external force F2, which is vertical in direction (indicated by arrow mark Z).
• the external force F2 which is parallel to the thickness direction of bent portions 61a, 71a, and 81a acts on the fixation stay 61 , optics stay 71 , and main stay 81.
• the fixation stay 61 , optics stay 71 , and main stay 81 are twisted, causing the right plate 51 to move upward.
• the image forming apparatus A changes in the positional relationship of the fixation stay 61 , optics stay 71, and main stay 81 relative to the right plate 51 and left plate 41 .
• the positional relationship between the laser scanner unit 90 as the exposing portion, and the photosensitive drum 10 as the photosensitive member, is disturbed, which is likely to cause the image forming apparatus A to output unsatisfactory images.
• a combination of the vertical portion 61b of the fixation stay 61 , and the vertical portion 81b of the main stay 81 , second fixing portion 31b of the L-angle 31 , and second fixing portion 36b of the L- angle 36 acts like a solid one-piece sub-frame, and bears the external force F2 which is perpendicular to the thickness direction of the fixation stay 61 and main stay 81 , and resists the external force F2. Therefore, it is possible to prevent the fixation stay 61 , optics stay 71 , and main stay 81 from being twisted, and/or the right plate 51 from being moved upward.
• Figure 16 is a perspective view of the frame 126 of a comparative example of image forming apparatus.
• the frame 126 of the comparative example is different in structure from the frame 26 in this embodiment. It does not have the L-angles 31 and 36. Its fixation stay 161 and main stay 181 are in connection to the left plate 141 and right plate 151 , only by being welded to the plates 141 and 151. Otherwise, the frame 126 is the same in structure as the frame 26 in the first embodiment. That is, it is the same as the frame 26, in the type of metallic plate, of which it is made, thickness of the metallic plate, and measurements.
• points PI - P4 ( Figure 8) of the frame 26, by which the frame 26 contacted the surface on which the frame 26 was placed, were kept under the following constraint: PI was constrained in the movement in the direction indicated by an arrow mark Z; P2 in the direction indicated by the arrow mark Z when dl was measured, but no constraint in the direction indicated by the arrow mark Z when d2 was measured; P3 in the directions indicated by the arrow marks Y and Z; and P4 was constrained in the directions indicated by the arrow marks X, Y and Z.
• the deformation of the frame 26 can be prevented, even if the frame 26 is structured so that the vertical portion 61b of the fixation stay 61 , and the second fixing portion 31b of the L-angle 31 , are fixed to each other through the left plate 41.
• the deformation of the frame 26 can be prevented, even if the frame 26 is structured so that the vertical portion 61b of the fixation stay 61 , and the second fixing portion 36b of the L-angle 36, are fixed to each other through the right plate 51.
• Figure 10 is a perspective view of the frame 26 structured as described above.
• Figure 11 is a sectional view of the frame 26, at a plane J-J in Figure 10. It shows the structure of the frame 26.
• the lengthwise end portions of the vertical portion 61 b of the fixation stay 61 are provided with a bent portion 61 bl , which was formed by bending the lengthwise end portion of the vertical portion 61b, in the direction which is roughly parallel to the first fixing portion 31a of L-angle 31 of the left plate 41 , and the first fixing portion 36a of the L-angle 36.
• the lengthwise ends of the vertical portion 81b of the main stay 81 are provided with bent portions 81 b 1 , which was formed by bending the lengthwise end portions in the direction which is roughly parallel to the portion of the left plate 41 , to which the first fixing portion 3 la of the L-angle 31 is fixed, and the portion of the right plate 51 , to which the first fixing portion 36a of the L-angle 36 is fixed.
• the bent portions 61 bl and 81 bl are fixed to the left plate 41 and right plate 51 by their base portion.
• the first fixing portion 31 a as the first portion of the L-angle 31 is welded to the left plate 41 , by its base portion, that is, the bend portion of the L-angle 31.
• the first fixing portion 36a as the third portion of the L-angle 36 is welded to the right plate 51 by their base portion, that is, the portion which is adjacent to the border line between the main portion of the L- angle 36, and the first fixing portion 36a.
• the frame 26 Since the frame 26 is structured as described above, a combination of the second fixing portions 31 b and 36b, and the vertical portions 61b and 81 b are put in a state which is similar to the one in which they are directly connected to each other. Therefore, as the external force F 1 or external force F2 acts on the aforementioned points of the frame 26 ( Figures 7 and 8), the second fixing portion 31b and 36b, and vertical portion 61b and 81b, bear the external force F1 and F2, which are perpendicular to the thickness direction of the fixation stay 61 and main stay 81 , and resists the external force F1 and F2. Therefore, it is possible to prevent the deformation of the frame 26.
• Figure 12 is a perspective view of the frame 26 in this embodiment.
• the frame 26 in this embodiment is similar in structure to the frame 26 in the first embodiment, except that the L-angle 31 , which is a fixing member, and also, the first fixing member, is fixed to the inward surface of the left plate 41 , and the L-angle 36 as the second fixing member, is fixed to the inward surface of the right plate 51.
• the L-angle 31 which is a fixing member, and also, the first fixing member, is fixed to the inward surface of the left plate 41
• the L-angle 36 as the second fixing member is fixed to the inward surface of the right plate 51.
• the second fixing portion 31b and 36b of the L-angles 31 and 36, respectively, by which the L-angles 31 and 36 are fixed to the fixation stay 61 as the fourth metallic plate, and the main stay 81 as the third metallic plate, are on the inward side of the left plate 41 and right plate 51 , respectively. Therefore, even if other members of the image forming apparatus A are on the outward side of the left plate 41 and/or right plate 51 , the L-angles 31 and 36 do not interfere with them. In other words, this embodiment affords more latitude in the positioning of other members.
• the two frames 26 are different in the position at which external forces are borne by the left and right plates 41 and 51.
• the two frames 26 are the same.
• the structural design, in this embodiment, for the frame 26 can also prevent the deformation of the frame 26.
• Figure 13 is a perspective view of the frame 26 in this embodiment.
• the second fixing portion 31 b of the L-angle 31 which is a fixing member, and also, is the first fixing member, is protrusive into the inward side of the left plate 41 , through the through holes 41 a and 41b, and is fixed to the vertical portion 61b of the fixation stay 61 as the fourth metallic plate, and the vertical portion 81b of the main stay 81 as the third metallic plate, on the inward side of the left plate 41.
• the second fixing portion 36b of the L-angle 36 as the first fixing member is intrusive into the inward side of the right plate 51 , through the through holes 51 a and 51 b of the right plate 51 as the second metallic plate.
• the frame 26 in this embodiment is similar in structure to the frame 26 in the first embodiment.
• Figures 14 and 15 are perspective views of the frame 26 of the image forming apparatus in this embodiment, which are different in the angel from which the frame 26 is seen.
• the left plate 41 and right plate 51 are not provided with L-angles 31 and 36, respectively. Instead, they are provided with bent portions 41c and 51c, respectively. Otherwise, the frame 26 in this embodiment is the same in structure as the one in the first embodiment.
• the left plate 41 as the first metallic plate is provided with a through hole 41x.
• the bent portion 41c is a part of the left plate 41 , which was formed by being bent in the opposite direction from the right plate 51. It is positioned in the adjacencies of the through hole 41x.
• the right plate 51 as the second metallic plate is provided with a through hole 5 lx.
• the bent portion 51c is a part of the right plate 51 , which was formed by being perpendicularly bent relatively to the main portion of the right plate 51 .
• the vertical portion 61b of the fixation stay 61 as the fourth metallic plate is positioned in such a manner that it extends outward of the left plate 41 through the through hole 4 lx. It is welded to the bend portion 41c.
• the vertical portion 61b of the fixation stay 61 is positioned in such a manner that it protrudes outward of the right plate 51 through the through hole 51x. It is welded to the bent portion 51 c.
• the left plate 41 and right plate 51 were provided with L-angles 31 and 36, respectively.
• the frame 26 can be prevented from deforming.
• the left plate 41 and right plate 51 are provided with the bent portions 41c and 51 c, respectively.
• the frame 26 can be prevented from deforming.
• an image forming apparatus including a frame constituted by multiple metal plates, in which a frame the formation is suppressed.

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• Electrophotography Configuration And Component (AREA)
• Accessory Devices And Overall Control Thereof (AREA)

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• 2018
  • 2018-12-04 JP JP2018227620A patent/JP7191664B2/ja active Active
• 2019
  • 2019-12-03 WO PCT/JP2019/047977 patent/WO2020116657A1/en not_active Ceased
  • 2019-12-03 DE DE112019006026.0T patent/DE112019006026B4/de active Active
  • 2019-12-03 GB GB2215970.1A patent/GB2608972B/en active Active
  • 2019-12-03 US US17/293,901 patent/US11493875B2/en active Active
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• 2022
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