JP5966331B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus that forms an image on a sheet such as paper.

  For example, in the image forming apparatus described in Patent Document 1, the sheet conveyance path is configured as one conveyance member, and the one conveyance member is positioned on the pair of frames by mechanical fastening means such as screws. It is fixed.

JP 2008-309992 A

  By the way, depending on the image forming apparatus, there is a case where a plurality of conveyance members must form a conveyance path. An image forming apparatus in which a conveyance path is configured by a plurality of conveyance members usually has the following configuration.

  That is, for example, in the case where the conveyance path is configured by the first conveyance member and the second conveyance member, the first conveyance member is positioned so as to be immovable with respect to the first conveyance member, and then the first The transport member and the second transport member are fixed by a mechanical fastening means such as a screw to constitute one transport unit. Thereafter, the transport unit is assembled and fixed to the frame.

  For this reason, the position of the 2nd conveyance member is determined on the basis of the 1st conveyance member. On the other hand, for example, since the position of the image forming unit or the like is assembled with the frame and the position is determined with reference to the frame, there is a possibility that a large variation occurs in the relative positional relationship of the image forming unit or the like with respect to the second transport member.

  If the dimensional tolerances of the transport members and the frame are strictly managed, the above-described variation can be reduced. However, this method increases the manufacturing cost of the image forming apparatus.

  In view of the above points, an object of the present invention is to suppress the occurrence of large variations in the relative positional relationship between various components arranged on a conveyance path.

  In order to achieve the above object, the present invention provides an image forming unit (5) for forming an image on a sheet, a first conveying member (27) and a second conveying member (29) constituting a sheet conveying path, A temporary fixing part (37) connected to the first conveying member (27) and the second conveying member (29) in a state in which the second conveying member (29) is movable with respect to the first conveying member (27); The frame (33, 35) to which the first conveying member (27) and the second conveying member (29) are fixed, and the first conveying member (27) are positioned so as to be stationary with respect to the frame (33, 35). And a second positioning unit (43) for positioning the second conveying member (29) so as not to move relative to the frame (33, 35). And

  Thereby, in this invention, each of the 1st conveyance member (27) and the 2nd conveyance member (29) is positioned on the basis of a flame | frame (33, 35). For this reason, the influence of the dimensional variation of each of the first transport member (27) and the second transport member (29) is reduced. Accordingly, it is possible to suppress the occurrence of large variations in the relative positional relationship between the various components arranged on the conveyance path.

  The first conveying member (27) and the second conveying member (29) are temporarily fixed and can be moved relative to each other before being assembled to the frames (33, 35). Therefore, the first transport member (27) and the second transport member (29) are positioned on the frame (33, 35) while absorbing the dimensional variations of the first transport member (27) and the second transport member (29). The influence of the dimensional variation of each second transport member (29) is reduced.

  Incidentally, the reference numerals in parentheses for each of the above means are examples showing the correspondence with the specific means described in the embodiments described later, and the present invention is indicated by the reference numerals in the parentheses of the above respective means. It is not limited to specific means.

1 is a central sectional view of an image forming apparatus according to an embodiment of the present invention. 2A is a side view on one end side in the width direction of the transport unit 26, and FIG. 2B is a side view on the other end side in the width direction of the transport unit 26. FIG. FIG. 3 is an exploded perspective view showing an arrangement relationship between a transport unit and a pair of frames 33 and in the image forming apparatus according to the embodiment of the present invention. FIG. 6 is a diagram illustrating the connection between a first transport member 27 and a second transport member 29. (A)-(f) is a figure which shows the state change of the 1st temporary fix | stop part 37. FIG. FIG. 4 is a diagram illustrating the connection between a first transport member 27 and a third transport member 31. (A)-(d) is a figure which shows the state change of the 2nd temporary fix | stop part 39. FIG. FIG. 4 is a diagram illustrating a relationship between a transport unit and a frame 33. 2 is a diagram illustrating an assembly process table of the image forming apparatus 1. FIG.

  The “embodiment of the invention” described below shows an example of the embodiment. In other words, the invention specific items described in the claims are not limited to the specific means and structures shown in the following embodiments.

In this embodiment, the present invention is applied to an electrophotographic image forming apparatus. Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1. Schematic Structure of Image Forming Apparatus In the housing 3 of the image forming apparatus 1, as shown in FIG. 1, a monochrome image that forms an image on a sheet by transferring a developer image onto a sheet such as recording paper or an OHP sheet. The image forming unit 5 of the type is accommodated.

  The image forming unit 5 according to the present embodiment includes a process cartridge 7 that forms a developing unit, an exposure device 9 that exposes the photosensitive drum 7A, a transfer roller 11 that transfers a developer image formed on the photosensitive drum 7A to a sheet, And a fixing unit 13 for heating and fixing the developer image transferred to the sheet.

  The sheet feeding cassette 15 is a sheet feeding tray that stores sheets conveyed to the image forming unit 5 in a stacked state. The paper feed cassette 15 according to the present embodiment is detachably attached to the apparatus main body (housing 3).

  The sheets stored in the paper feed cassette 15 are sent to the image forming unit 5 by the pickup roller 17 and then separated one by one by the separation roller 19 and the separation pad 21 and conveyed to the image forming unit 5. Is done.

  In addition, the sheet unloaded from the separation roller 19 is turned by the conveyance chute 23A so that the conveyance direction is turned upward by the conveyance chute 23A while being conveyed by the conveyance roller 23. Thereafter, the sheet is fed to the image forming unit 5 at a predetermined timing after the posture is corrected by the pair of registration rollers 25.

  By the way, the sheet conveyance path from the exit of the conveyance chute 23A to the fixing device 13 is configured by arranging approximately three conveyance members 27 to 31 in series along the conveyance path, as shown in FIGS. ing.

  Hereinafter, among the three transport members 27 to 31, the transport member positioned at the intermediate portion in the transport direction is referred to as a first transport member 27, and among the three transport members 27 to 31, the transport member positioned on the most downstream side in the transport direction. Called the second transport member 29, the transport member located at the most upstream in the transport direction among the three transport members 27-31 is called the third transport member 31, and when the three transport members 27-31 are generically referred to, the transport unit 26.

  The first conveying member 27 is made of a resin such as acrylonitrile butadiene lithium (ABS), which is superior in wear resistance and mechanical strength as compared with the second conveying member 29 and the third conveying member 31. On the other hand, the 2nd conveyance member 29 and the 3rd conveyance member 31 are resin products, such as steel resin (PS) excellent in the moldability.

2. About each conveyance member As shown in FIG. 3, a pair of frames 33 and 35 arranged opposite to each other are disposed on both sides of the conveyance unit 26. Incidentally, each of the pair of frames 33 and 35 is a resin-made strength member formed in a generally plate shape.

  The transport members 27 to 31 are fixed to a pair of frames 33 and 35. In FIG. 3, the image forming unit 5 and the like are omitted, but the image forming unit 5 is also directly or indirectly fixed to the pair of frames 33 and 35.

  Further, as shown in FIG. 4, the second conveying member 29 is connected to the first conveying member 27 by a first temporary fixing portion 37 so as to be movable relative to the first conveying member 27. . That is, the second transport member 29 is temporarily fixed to the first transport member 27.

  The first temporary fixing portion 37 includes cylindrical or cylindrical projections 37A and 37B provided at both ends in the width direction of the first conveyance member 27 and the second conveyance member 29, and hole portions 37C into which the respective projections 37A and 37B are fitted. , 37D, and the projecting portions 37A, 37B are configured by holding portions 37E, 37F, etc. for maintaining the state where the projecting portions 37A, 37B are fitted in the holes 37C, 37D.

  Incidentally, the width direction is a direction perpendicular to the sheet conveyance direction and the thickness direction of the sheet conveyed on the conveyance unit 26. In the present embodiment, the width direction coincides with the left-right direction of the image forming apparatus 1, that is, the direction orthogonal to the plate surfaces of the pair of frames 33 and 35.

  That is, the protrusion 37A is provided on one end in the width direction of the first conveying member 27, and the hole 37D is provided on the other end in the width. On the other hand, a hole 37C into which the protrusion 37A is fitted is provided on one end side in the width direction of the second conveying member 29, and a protrusion 37B to be fitted into the hole 37C is provided on the other end in the width direction. .

  Therefore, when the second transport member 29 is moved from the one end side in the width direction toward the other end side with respect to the first transport member 27 so as to move the second transport member 29 to the left side, FIG. As shown in FIG. (D), the projection 37A is fitted in the hole 37C, the projection 37B is fitted in the hole 37D, and the projections 37A, 37B are locked in the holes 37C, 37D. It becomes.

  Further, as shown in FIG. 5E, a tapered portion 37G having a thickness dimension that decreases toward the root side is formed on the distal end side of the leaf spring-shaped holding portion 37E provided on the second conveying member 29. ing. On the other hand, the holding portion 37F provided in the first conveying member 27 is a plate spring-like member having a larger bending rigidity than the holding portion 37E, and is provided with a tapered portion 37H similar to the holding portion 37E. Yes.

  Therefore, when the second transport member 29 is moved from the one end side in the width direction to the other end side with respect to the first transport member 27 so as to move the second transport member 29 to the left side, FIG. As shown, the tapered portion 37G of the holding portion 37E is elastically deformed so as to ride on the tapered portion 37H of the holding portion 37F.

  Then, when the second transport member 29 is moved in the width direction with respect to the first transport member 27 until the projections 37A and 37B are fitted in the holes 37C and 37D, as shown in FIG. Since the leading ends of the holding portions 37E and 37F are in contact with each other, the second transport member 29 is moved from the other end in the width direction so that the second transport member 29 moves to the right side with respect to the first transport member 27. Movement toward one end side is restricted. Therefore, the state in which the protrusions 37A and 37B are locked to the holes 37C and 37D is maintained.

  Further, as shown in FIG. 6, the third conveying member 31 is connected to the first conveying member 27 by a second temporary fixing portion 39 so as to be movable relative to the first conveying member 27. . That is, the third transport member 31 is also temporarily fixed to the first transport member 27 in the same manner as the first transport member 27.

  As shown in FIGS. 7A to 7D, the second temporary fixing portion 39 is provided at the tip of a leaf spring-like elastic portion 39 </ b> C provided at both ends in the width direction of the first conveying member 27. The hook-shaped locking part 39A and the locked part 39B provided on the both ends in the width direction of the third conveying member 31 and locked with the locking part 39A are configured.

  For this reason, when the third transport member 31 is moved toward the first transport member 27 side, the elastic portion 39C is elastically deformed as shown in FIGS. Is elastically deformed so as to get over the locked portion 39B.

  Then, when the third transport member 31 is further moved toward the first transport member 27 side, as shown in FIGS. 7C to 7D, the locking portion 39A and the locked portion 39B are formed. The locked state is maintained and the locked state is maintained by the elastic portion 39C.

3. Assembly and fixing structure of the conveyance unit to the frame After the three conveyance members 27 to 31 are temporarily fixed to each other and the conveyance unit 26 is assembled, the respective conveyance members 27 to 31 are positioned with respect to the pair of frames 33 and 35. In this state, it is fixed to the pair of frames 33 and 35 by a mechanical fixing member such as a screw. That is, as shown in FIG. 8, the transport unit 26 and the frames 33 and 35 are provided with a first positioning unit 41, a second positioning unit 43, and a third positioning unit 45.

  The first positioning unit 41 is a means for positioning the first conveying member 27 so as to be stationary with respect to the pair of frames 33 and 35. The second positioning unit 43 is a means for positioning the second conveying member 29 so as to be stationary with respect to the pair of frames 33 and 35. The third positioning unit 45 is a means for positioning the third transport member 31 so as to be stationary with respect to the pair of frames 33 and 35.

  The first positioning unit 41 to the third positioning unit 45 provided on the frame 33 side and the first positioning unit 41 to the third positioning unit 45 provided on the frame 35 side are technically related. Since the idea is the same, the configuration of each of the first positioning unit 41 to the third positioning unit 45 will be described below using the first positioning unit 41 to the third positioning unit 45 provided on the frame 33 side as an example. To do.

<First Positioning Department>
As shown in FIG. 8, the first positioning portion 41 includes a first reference protrusion 41A, a first reference hole 41B into which the first reference protrusion 41A is fitted, a first restriction protrusion 41C, and a first restriction. The first restricting hole 41D and the like into which the protruding portion 41C is fitted are configured.

  The first reference protrusion 41 </ b> A is a columnar or cylindrical boss provided at a portion facing the frame 33 side of the first transport member 27 and protruding toward the frame 33. On the other hand, the first reference hole 41B is a hole provided in the frame 33, and is a round hole having an inner diameter substantially the same as the diameter of the first reference protrusion 41A.

  The first restriction protrusion 41C and the first restriction hole 41D constitute a first rotation restriction part that restricts the first transport member 27 from rotating around the first reference protrusion 41A. The first restricting protrusion 41 </ b> C is a columnar or cylindrical boss protruding from the frame 33 toward the first transport member 27. On the other hand, the first restricting hole 41D is a hole formed in the first conveying member 27, and has a substantially oval cross section having a major axis in a direction parallel to the sheet conveying direction.

  The dimension in the minor axis direction of the first restriction hole 41D is substantially the same as the diameter of the first restriction projection 41C. For this reason, the first transport member 27 absorbs the dimensional variation from the first reference protrusion 41A to the first restricting hole 41D and the dimensional variation from the first reference hole 41B to the first restricting protrusion 41C. It is possible to restrict rotational displacement around the portion 41A.

  In the present embodiment, one of the pair of registration rollers 25 is assembled to the first conveying member 27. The first reference protrusion 41 </ b> A is provided at a position close to the registration roller 25. Specifically, the first reference protrusion 41A is located at a position where the distance L1 from the first reference protrusion 41A to the registration roller 25 is smaller than the distance L2 from the first reference protrusion 41A to the first restriction hole 41D. Is provided.

<Second positioning section>
The second positioning unit 43 has the same configuration as the first positioning unit 41. That is, the second reference projection 43A, the second reference hole 43B into which the second reference projection 43A is fitted, the second regulation projection 43C, the second regulation hole 43D into which the second regulation projection 43C is fitted, and the like. It is configured.

  The second reference protrusion 43 </ b> A is a columnar or cylindrical boss protruding from the frame 33 toward the second transport member 29. On the other hand, the second reference hole 43B is a hole provided in the second conveying member 29, and is a round hole having an inner diameter substantially the same as the diameter dimension of the second reference protrusion 43A.

  The second restriction protrusion 43C and the second restriction hole 43D constitute a second rotation restriction part that restricts the second transport member 29 from rotating around the second reference protrusion 43A. The second restricting protrusion 43 </ b> C is a columnar or cylindrical boss protruding from the frame 33 toward the second transport member 29. On the other hand, the second restriction hole 43D is a hole formed in the second conveying member 29, and has a substantially oval cross section having a major axis in a direction parallel to the sheet conveying direction.

  The dimension in the minor axis direction of the second restriction hole 43D is substantially the same as the diameter of the second restriction projection 43C. Therefore, the second transport member 29 absorbs the dimensional variation from the second reference hole 43B to the second restriction hole 43D and the dimensional variation from the second reference protrusion 43A to the second restriction protrusion 43C, while the second conveying member 29 is the second reference protrusion. The rotational displacement around the portion 43A can be restricted.

  Further, as shown in FIG. 1, the second conveying member 29 is disposed on the lower side of the fixing device 13. For this reason, as shown in FIG. 8, the second transport member 29 is provided with a load receiving portion 29 </ b> A that receives at least part of the gravity acting on the fixing device 13. The second reference hole 43B is provided in the load receiving portion 29A.

<Third positioning section>
The third positioning unit 45 has the same configuration as the second positioning unit 43. That is, the third reference projection 45A, the third reference hole 45B into which the third reference projection 45A is fitted, the third regulation projection 45C, the third regulation hole 45D into which the third regulation projection 45C is fitted, and the like. It is configured.

  The third reference protrusion 45 </ b> A is a columnar or cylindrical boss protruding from the frame 33 toward the third transport member 31. On the other hand, the third reference hole 45B is a hole provided in the third transport member 31, and is a round hole having an inner diameter substantially the same as the diameter dimension of the third reference protrusion 45A.

  The third restriction protrusion 45C and the third restriction hole 45D constitute a third rotation restriction part that restricts the third transport member 31 from rotating around the third reference protrusion 45A. The third restricting protrusion 45 </ b> C is a columnar or cylindrical boss protruding from the frame 33 toward the third transport member 31. On the other hand, the third restriction hole 45D is a hole formed in the third conveyance member 31, and has a substantially oval cross section in which the direction parallel to the sheet conveyance direction has a long diameter.

  The dimension in the minor axis direction of the third restriction hole 45D is substantially the same as the diameter of the third restriction projection 45C. For this reason, the third conveying member 31 absorbs the dimensional variation from the third reference hole 45B to the third restriction hole 45D and the dimensional variation from the third reference protrusion 45A to the third restriction protrusion 45C, while the third conveying member 31 has the third reference protrusion. The rotational displacement around the portion 45A can be restricted.

  Accordingly, each of the conveying members 27 to 31 is configured such that each of the restricting protrusions 41C is positioned in a state where the positions of the reference protrusions 41A to 45A with respect to the pair of frames 33 and 35 are determined by fitting the reference protrusions 41A to 45A into the reference holes 41B to 45B. The rotation is stopped by ~ 45C.

  And it fixes with respect to a pair of flame | frames 33 and 35 with the screws S1-S3 inserted in each reference | standard protrusion part 41A-45A vicinity. For this reason, the conveying members 27 to 31 are provided with screw holes 41E to 45E into which the screws S1 to S3 are screwed.

  The vicinity of the reference protrusions 41A to 45A is, for example, the first conveying member 27. For example, the distance from the first reference hole 41B to the screw hole 41E is the first restriction hole 41B to the first restriction hole. It is less than the distance to 41D. Incidentally, in this embodiment, the distance from each screw hole 41E-45E to each reference hole 41B-45B is set to 28 mm or less.

4). Manufacturing Method of Image Forming Apparatus According to this Embodiment A manufacturing method of the image forming apparatus 1 according to this embodiment will be described in the order of assembling steps according to the schematic process shown in FIG. The following steps are operations performed by an operator or an automatic assembly machine.

  First, the second conveying member 29 is assembled to the first conveying member 27 by the first temporary fixing part 37, and the third conveying member 31 is assembled to the first conveying member 27 by the second temporary fixing part 39. After the assembly, the transport unit 26 is mounted on an assembly jig (not shown) (S1).

  Next, after each conveyance member 27-31 is positioned by a pair of frames 33 and 35 by the position determination parts 41-45, and is made into an immovable state with respect to a pair of frames 33 and 35 (S3), each conveyance member 27 to 31 are fixed to the pair of frames 33 and 35 with screws S1 to S3 (S5).

Thereafter, after the component parts such as the image forming unit 5 and the housing 3 are assembled to the pair of frames 33, 35, etc. (S7), the operation and the assembled state of the component parts are inspected (S9).
5. Features of Image Forming Apparatus According to this Embodiment In this embodiment, each of the first transport member 27 to the third transport member 31 is positioned with reference to the pair of frames 33 and 35. For this reason, since the relative positional relationship between the conveying members 27 to 31 and the various components is determined by the pair of frames 33 and 35, the influence of the dimensional variation of each of the first conveying member 27 to the third conveying member 31 is small. Become. Accordingly, it is possible to suppress the occurrence of large variations in the relative positional relationship between the various components arranged on the conveyance path.

  In addition, the transport members 27 to 37 are temporarily fixed and can be moved relative to each other before being assembled to the pair of frames 33 and 35. For this reason, each of the first conveying member 27 to the third conveying member 31 is positioned on the pair of frames 33 and 35 while absorbing the dimensional variation of each of the first conveying member 27 to the third conveying member 31. The influence of the dimensional variation is reduced.

  In this embodiment, the distance L1 from the first reference protrusion 41A to the registration roller 25 is smaller than the distance L2 from the first reference protrusion 41A to the first restriction hole 41D. Thereby, in this embodiment, since the position variation of the registration roller 25 with respect to the pair of frames 33 and 35 can be reduced, good image formation is possible.

  That is, since the registration roller 25 has a function of correcting the posture of the sheet, if the positional variation of the registration roller 25 with respect to the pair of frames 33 and 35 is large, there is a high possibility of adversely affecting image formation. On the other hand, in this embodiment, since the position variation of the registration roller 25 can be reduced, it is possible to form a good image.

  In the present embodiment, the distance from the first reference protrusion 41A to the registration roller 25 is defined as the distance from the rotation center line of the registration roller 25 to the center of the first reference protrusion 41A. The distance from the first reference protrusion 41A to the first restriction hole 41D is defined as the distance from the center of the first reference protrusion 41A to the center of the first restriction hole 41D.

  In the present embodiment, the second conveying member 29 is disposed below the fixing device 13, and the second reference protrusion is formed on the load receiving portion 29 </ b> A that receives at least part of the gravity acting on the fixing device 13. A feature is that a portion 43A is provided.

  Accordingly, in the present embodiment, since at least a part of the gravity acting on the fixing device 13 can be received by the second reference protrusion 43A, the second conveying member 29 is greatly bent by the gravity acting on the fixing device 13. Deformation can be prevented.

(Other embodiments)
In the above-mentioned embodiment, although the conveyance unit 26 was comprised by the three conveyance members 27-31, this invention is not limited to this, For example, in two conveyance members or four or more conveyance members The transport unit 26 may be configured.

  In the above-described embodiment, the present invention is applied to a monochrome laser printer. However, the present invention is not limited to this, and can be applied to, for example, a color laser printer, an inkjet image forming apparatus, and the like. .

  Moreover, in the above-mentioned embodiment, although each conveyance member 27-31 was fixed with screw | thread S1-S3, this invention is not limited to this, For example, screw | thread S1-S3 is abolished and a pair of frame You may fix so that it may be pinched | interposed by 33,35.

  Moreover, the structure of the 1st temporary fix part 37 and the 2nd temporary fix part is not limited to the structure shown by embodiment of the above-mentioned embodiment, For example, the latching connection part and screw | thread using elastic deformation It may be a temporary connection using the.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 3 ... Housing 5 ... Image forming part 7 ... Process cartridge 7A ... Photosensitive drum 9 ... Exposure device 11 ... Transfer roller 13 ... Fixing device 15 ... Paper feed cassette 17 ... Pickup roller 19 ... Separation roller 21 ... Separation Pad 23 ... Conveying roller 23A ... Conveying chute 25 ... Registration roller 26 ... Conveying unit 27 ... First conveying member 29 ... Second conveying member 29A ... Load receiving portion 31 ... Third conveying member 33, 35 ... Frame 37 ... First provisional Stop part 39 ... 2nd temporary fix part 41 ... 1st positioning part 41A ... 1st reference projection part 41B ... 1st reference hole 41C ... 1st regulation projection part 41D ... 1st regulation hole 41E ... Screw hole 43 ... 2nd Position determining portion 43A ... second reference protrusion 43B ... second reference hole 43C ... second restricting protrusion 43D ... second restricting hole 45 ... third position determining portion 45A ... 3rd reference protrusion 45B ... 3rd reference hole 45C ... 3rd control protrusion 45D ... 3rd control hole 45E ... Screw hole S1-S3 ... Screw

Claims (7)

An image forming unit for forming an image on a sheet;
A first conveying member and a second conveying member constituting a sheet conveying path;
A temporary fixing portion connected to the first conveying member and the second conveying member in a state in which the second conveying member is movable with respect to the first conveying member;
A frame to which the first transport member and the second transport member are fixed;
A first positioning portion that positions the first transport member so as to be stationary with respect to the frame;
A second positioning part that positions the second transport member so as to be stationary with respect to the frame;
The first positioning unit is
A first reference protrusion provided on one of the first conveying member and the frame and fitted in a first reference hole provided on the other; and the first conveying member rotates around the first reference protrusion. A first rotation restricting portion for restricting
The first transport member and the second transport member are arranged in series along the transport path,
A registration roller that corrects the posture of the sheet is provided at a portion of the conveyance path that is configured by the first conveyance member.
Further, the image forming apparatus is characterized in that a distance from the first reference protrusion to the registration roller is smaller than a distance from the first reference protrusion to the first rotation restricting portion. The temporary fixing portion is
Provided in the first conveying member, provided in at least one of the first conveying member and the second conveying member, and an engaged portion that engages with an engaging portion provided in the second conveying member; The image forming apparatus according to claim 1, further comprising: an elastically deformable elastic portion that maintains a locked state between the locking portion and the locked portion. The second positioning unit is
A second reference protrusion provided in one of the second transport member and the frame and fitted in a second reference hole provided in the other; and the second transport member rotates around the second reference protrusion. The image forming apparatus according to claim 1, further comprising: a second rotation restricting portion that restricts this. The image forming unit includes a transfer unit that transfers the developer to the sheet, and a fixing unit that heats and fixes the developer transferred to the sheet,
The second conveying member is disposed below the fixing unit, and has a load receiving unit that receives at least a part of gravity acting on the fixing unit,
The image forming apparatus according to claim 3, wherein the second reference protrusion or the second reference hole is provided in the load receiving portion.   5. The image forming apparatus according to claim 1, wherein the first transport member and the second transport member are made of different resin materials. 6. A first screw for fixing the first conveying member to the frame;
The image forming apparatus according to claim 1, further comprising: a second screw that fixes the second transport member to the frame.   7. The frame according to claim 1, wherein the frame includes a pair of frames arranged to face each other with the first transport member and the second transport member interposed therebetween. Image forming apparatus.

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