JP4415970B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to a copying machine, a laser printer, and other electrophotographic image forming apparatuses, and more particularly, to an image forming apparatus that prevents a toner image forming apparatus support frame of the image forming apparatus from bending.

  In an image forming apparatus, alignment (registration) of each component is an important element in a color image. In particular, a toner image formed on a plurality of image carriers whose rotation axes are parallel is transferred to a transfer material (intermediate transfer belt or sheet transport) at a transfer position set along the rotational movement path of each image carrier surface. In a tandem type image forming apparatus transferred on a recording sheet or the like conveyed by a belt, the registration error (registration error) appears as a color shift in the recorded image. At present, the generally accepted registration error value is about 125 μm.

There are various causes for the registration error, especially due to deformation of the frame due to the installation environment of the image forming apparatus (levelness, unevenness, rigidity, etc. of the surface on which the image forming apparatus is installed). is there. That is, if the image forming apparatus is not stabilized due to the installation environment, the image forming apparatus is not supported uniformly, and deformation such as bending or twisting occurs in the frame.
The deformation of the frame causes an alignment error (positioning error) set in the internal unit, which is a problem. For example, the following problem occurs based on the alignment error.
(1) The displacement of the positional relationship between, for example, ROS (latent image writing device) and the photosensitive member (image carrier) of the transfer position of each image carrier is a skew component of an image formed on the image carrier ( A slope error) and a registration error occurs.
(2) The alignment error of the unit supporting the belt member induces a belt walk (belt meandering), and if the alignment error exceeds an allowable value, the belt breaks in the worst case.

  In order to solve the problems caused by the deformation of the frame, the support structure of the image forming apparatus on the floor (frame mounting surface) on which the frame of the image forming apparatus is mounted is devised, and the support structure is It is necessary to reduce the amount of deformation such as the amount of bending and twisting of the frame of the image forming apparatus.

In the conventional image forming apparatus, for example, the following techniques (J01) and (J02) are conventionally known in order to stably install the image forming apparatus on a frame mounting surface such as a floor.
(J01) Technology described in Japanese Utility Model Publication No. 4-40198 In this publication, there are three legs (foot) arranged at the apex of a triangle and the surface on which the image forming apparatus such as a floor is not placed under normal use. An image forming apparatus provided with other feet is described.
(J02) Technique described in JP-A-8-44132 This publication describes a technique for fixing an image forming apparatus at an installation position with a foot having a suction cup.

No. 4-40198 JP-A-8-44132

(Problems of the prior art (J01))
In the prior art (J01), since there are three feet in contact with the floor in a normal use state, the posture of the image forming apparatus becomes unstable compared with the case of four feet, and the operator leans against it. There is a problem that the image forming apparatus easily tilts due to external force generated at times. When tilted, the foot that does not contact the floor in the normal use state contacts the floor, but there is a problem that an impact is applied to the image forming apparatus when the foot contacts the floor. There is also a problem that an impact sound is generated.
(Problems of the prior art (J02))
The prior art (J02) has problems that it is difficult to move the image forming apparatus fixed by the suction cup, the suction cup is easily damaged, and the life of the foot is short.

  As a method for reducing deformation such as bending and twisting of the frame, it is conceivable to increase the rigidity of the frame, but there is a problem that the weight increases and the cost also increases.

In view of the above-described problems, the present invention has the following (O01) description as an object.
(O01) To prevent deformation such as bending or twisting of a toner image forming apparatus support frame that supports a toner image forming apparatus such as an image carrier or ROS.

  Next, the present invention that has solved the above problems will be described. In the description of the present invention, the reference numerals in parentheses added after the constituent elements of the present invention are constituent elements of the embodiments described later corresponding to the constituent elements of the present invention. It is a sign. The reason why the present invention is described in correspondence with the reference numerals of the constituent elements of the embodiments described later is to facilitate understanding of the present invention, and not to limit the scope of the present invention to the embodiments.

(First invention)
In order to solve the above problems, an image forming apparatus according to a first invention of the present application is:
At least an image carrier (PRy, PRm, PRc, PRk) and a latent image writing device (ROS) that forms a latent image according to an image signal on the image carrier (PRy, PRm, PRc, PRk). A toner image forming apparatus support frame (FR1) for supporting the toner image forming apparatus (V) having
The toner image forming apparatus support frame (FR1) is supported and configured separately from the toner image forming apparatus support frame (FR1), and is provided below the toner image forming apparatus support frame (FR1). A lower frame (FR2) for supporting a placement member (S0) supported by a supported portion (H0) disposed on a lower wall (16) of the toner image forming apparatus support frame (FR1);
Bei to give a,
The toner image forming apparatus support frame (FR1) is
The lower wall (16);
A plurality of side walls (17, 18, 19) connected to the lower wall (16);
It has a pair of mounting parts (22a, 22b) connected via a connecting part (21), and is connected to any of the side walls (17, 18, 19) of the lower wall (16). One mounted member (S0) attached at a plurality of locations with respect to the supported portion (H0) disposed at a non-position,
Two mounted members (S1, S2) attached to a position connected to any of the side walls (17, 18, 19) of the lower wall (16);
It is characterized by having .

(Operation of the first invention)
In the image forming apparatus according to the first aspect of the present invention, the toner image forming apparatus support frame (FR1) includes an image carrier (PRy, PRm, PRc, PRk) and the image carrier (PRy, PRm, A toner image forming device (V) having at least a latent image writing device (ROS) that forms a latent image corresponding to an image signal on PRc, PRk) is supported.
The toner image forming apparatus support frame (FR1) includes the lower wall (16), a plurality of side walls (17, 18, 19) connected to the lower wall (16), and a connecting portion (21). It has a pair of mounting parts (22a, 22b) to be connected, and is placed at a position not connected to any of the side walls (17, 18, 19) of the lower wall (16). One mounting member (S0) attached at a plurality of locations and one of the side walls (17, 18, 19) of the lower wall (16) are connected to the support portion (H0). And two placement members (S1, S2) attached to the position.
The toner image forming apparatus support frame (FR1) is configured separately from the toner image forming apparatus support frame (FR1). The lower frame (FR2) provided below the toner image forming apparatus support frame (FR1) ) Supporting the mounting member (S0) supported by the supported portion (H0) disposed on the lower wall (16) .
Therefore, in the image forming apparatus of the first invention, a toner image forming apparatus support frame (FR1) is one of the mounting member supported by the lower frame (FR2) provided below (S0) is, the lower wall ( 16) is supported by a supported portion (H0) arranged at a position where it is not connected to any of the side walls (17, 18, 19), that is, at a position where it is easy to bend. Therefore, when there is distortion or the like, the supported portion (H0) of the lower wall (16) bends and absorbs, and the upper portion (FR1a) of the toner image forming apparatus support frame (FR1) is not easily bent. For this reason, it is possible to prevent deformation of the toner image forming apparatus support frame (FR1) that supports the image carrier (PRy, PRm, PRc, PRk), the latent image writing apparatus (ROS), and the like, such as bending and twisting. It is possible to suppress the displacement of the image carrier (PRy, PRm, PRc, PRk) and the latent image writing device (ROS).

( Embodiment 1 )
The image forming apparatus according to the first invention, in the first invention,
The toner image forming apparatus support frame (FR1) includes a plurality of image carriers (PRy, PRm, PRc, PRk) arranged in parallel to a surface placed on the lower frame (FR2). Features.
( Operation of Form 1 of the Invention )
In the image forming apparatus according to the first aspect of the invention having the above-described structural requirements, a plurality of the image bearing members (FR1) are mounted on the surface on which the toner image forming apparatus support frame (FR1) is placed on the lower frame (FR2). Since PRy, PRm, PRc, and PRk) are arranged in parallel, it is possible to suppress the positional deviation of the toner images of the respective colors.

The image forming apparatus of the present invention described above can achieve the following effect (K01).
(K01) It is possible to prevent deformation such as bending and twisting of a toner image forming apparatus support frame that supports a toner image forming apparatus such as an image carrier or ROS.

(Example)
Next, specific examples (examples) of the embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.

( Reference Example 1 )
FIG. 1 is a front sectional view of Reference Example 1 of the image forming apparatus of the present invention.
In FIG. 1, the image forming apparatus U includes an automatic document feeder U1 and an image forming apparatus main body (copier) U2 having a platen glass PG that supports the automatic document feeder U1.
The automatic document feeder U1 has a document feed tray TG1 on which a plurality of documents Gi to be copied are placed and a copy position (document reading position) on the platen glass PG from the document feed tray TG1. And a document discharge tray TG2 from which the document Gi transported and conveyed is discharged.
The image forming apparatus main body U2 has a UI (user interface) for allowing a user to input an operation command signal such as a copy start, an exposure optical system A, and the like.

Reflected light from a document transported on the platen glass PG by the automatic document transport device U2 or a document (not shown) manually placed on the platen glass PG passes through the exposure optical system A and is a CCD (solid imaging device). Elements) are converted into electrical signals of R (red), G (green), and B (blue).
The IPS (image processing system) temporarily converts the RGB electrical signals input from the CCD into image data of K (black), Y (yellow), M (magenta), and C (cyan) colors. The image data is stored and output to the laser drive circuit DL as image data for forming a latent image at a predetermined timing.
The laser driving circuit DL outputs a laser driving signal corresponding to the input image data to a latent image writing laser diode (not shown) of each color of a ROS (latent image writing device) at a predetermined timing. .

  Each image carrier PRy, PRm, PRc, PRk on which an electrostatic latent image is formed by laser light Ly, Lm, Lc, Lk emitted from a ROS (latent image writing device) is a respective charging roll CRy, CRm, CRc. , CRk and then electrostatic latent images are formed on the surfaces of the image writing areas Q1y, Q1m, Q1c, Q1k by the laser beams Ly, Lm, Lc, Lk. The electrostatic latent images on the surfaces of the image carriers PRy, PRm, PRc, PRk are developed into toner images by developing units Gy, Gm, Gc, Gk in the development areas Q2y, Q2m, Q2c, Q2k. The developers Gy, Gm, Gc, and Gk are replenished with the developer from the developer cassettes Ky, Km, Kc, and Kk disposed above according to the consumption of the developer by the developing operation.

  The toner images of the respective colors developed on the surface surfaces of the image carriers PRy, PRm, PRc, PRk are intermediate transfer belts by primary transfer rolls T1y, T1m, T1c, T1k in the primary transfer regions Q3y, Q3m, Q3c, Q3k. The primary transfer is performed in sequence on B. Residual toner on the surface of the image carrier PRy, PRm, PRc, PRk after the primary transfer is removed by an image carrier cleaner CLy, CLm, CLc, CLk.

A belt module BM disposed above each of the image carriers PRy to PRk includes a belt support roll (Rt, Rw) including a tension roll Rt, a walking roll Rw, an idler roll (free roll) Rf, and a backup roll T2a that also serves as a drive roll. , Rf, T2a), the intermediate transfer belt B rotatably supported by them, and the primary transfer rolls T1y, T1m, T1c, T1k.
A secondary transfer roll T2b is disposed in contact with the surface of the intermediate transfer belt B in contact with the backup roll T2a, and a secondary transfer area Q4 is formed by these contact areas. The backup roll T2a and the secondary transfer roll T2b constitute a secondary transfer device T2.
The recording sheets S on the paper feed tray TR1 arranged below the ROS are taken out by the pick-up roll Rp, separated one by one by the separating roll Rs, and then conveyed to the secondary transfer area Q4 by the registration roll Rr. When the recording sheet S passes through the secondary transfer region Q4, the color toner image primarily transferred onto the intermediate transfer belt B is secondarily transferred to the recording sheet S by the secondary transfer device T2.
The intermediate transfer belt B after the secondary transfer is cleaned by a belt cleaner CLb.

  The recording sheet S onto which the toner image has been secondarily transferred is heated and fixed when passing through the pressure contact area (fixing area Q5) of the heating roll Fh and pressure roll Fp of the fixing device F, and then discharged from the discharge roller Rh. It is discharged to the paper tray TRh. Note that a release agent for improving the releasability of the recording sheet S from the heating roll Fh is applied to the surface of the heating roll Fh by a release agent coating device Fa.

In this reference example 1 , a toner image forming device V is constituted by a member that forms a toner image on the intermediate transfer belt B, a secondary transfer device T2 that transfers the toner image to a recording sheet S, a fixing device F, and the like. The toner image forming apparatus V is supported by a toner image forming apparatus support frame FR1. A lower end portion of the toner image forming apparatus support frame FR1 is supported by a lower frame FR2 that accommodates the paper feed tray TR1.

(Toner image forming device support frame and lower frame)
FIG. 2 is an explanatory diagram showing a state in which the toner image forming apparatus supporting frame and the lower frame of the image forming apparatus according to the first embodiment of the present invention are connected, and is a portion surrounded by a thick line of the image forming apparatus of FIG. . FIG. 3 is an explanatory view of a placement member provided on the lower surface of the toner image forming apparatus support frame and an explanatory view of a connecting portion between the placement member and the lower frame. FIG. 3A is a view of supporting the toner image forming apparatus. Explanatory drawing of the mounting member provided in the flame | frame, FIG. 3B is principal part expansion explanatory drawing of the said connection part.

2 and 3, supported portions H1, H2, and H3 are provided on the lower wall of the toner image forming apparatus support frame FR1 supported by the lower frame FR2, and the supported portions H1, H2, and Mounted members S1, S2, and S3 are fixed to H3. The supported portions H1, H2, H3 and the three placement members S1, S2, S3 are formed on the toner image forming device support frame FR1 and the toner image forming device support frame FR1 when viewed from above and below. It arrange | positions at the vertex of the triangle which contains the whole gravity center inside including the supported member inside.
In FIG. 3B, each placement member S1 (to S3) of the toner image forming apparatus support frame FR1 is screwed to a frame support member FR2a provided at the upper end of the lower frame FR2. A paper feed tray TR1 is slidably supported on the lower frame FR2. Further, four feet (placed members) 1 are provided on the lower surface of the lower frame FR2, and each foot 1 is an upper surface (frame placing surface) P such as a floor for supporting the image forming apparatus U. It is a member mounted in (refer FIG. 1).

( Operation of Reference Example 1 )
2 and 3, the toner image forming apparatus support frame FR1 supports the toner image forming apparatus V (see FIG. 1) of the image forming apparatus U. A lower frame FR2 disposed below the toner image forming device support frame FR1 supports the three placement members S1, S2, and S3 of the toner image forming device support frame FR1.
When viewed from above and below, the total center of gravity including the toner image forming apparatus support frame FR1 and the members supported by the toner image forming apparatus support frame FR1 is the three mounted members S1, S2, S3. (That is, the to-be-supported portions H1, H2, and H3) are arranged in a triangular shape having apexes, so that a torsional moment and a bending moment acting on the toner image forming device support frame FR1 are small. Therefore, the amount of deformation, such as bending or distortion, generated in the toner image forming apparatus support frame FR1 is reduced, so that the image carriers PRy to PRk constituting the toner image forming apparatus V supported by the toner image forming apparatus support frame. And the latent image writing device ROS can be held at predetermined positions.
Further, since the toner image forming apparatus support frame FR1 is less likely to be distorted, it is possible to make the structure low in rigidity and to reduce the weight of the image forming apparatus U.

( Reference Example 2 )
Figure 4 is a perspective view of an image forming apparatus of the present reference example 2 is a diagram of a state where the toner image forming device supporting frame and the lower frame of the image forming apparatus according to the Reference Example 2 were separated.
In the description of the reference example 2, wherein the same reference numerals to components corresponding to those of Reference Example 1, a detailed description thereof will be omitted.
The reference example 2 is different from the reference example 1 in the following points, but is configured in the same manner as the reference example 1 in other points.

In FIG. 4, the toner image forming apparatus support frame FR1 of the image forming apparatus U of Reference Example 2 slides on the toner image forming apparatus support frame upper portion FR1a that supports the toner image forming apparatus V and the first paper feed tray TR1. And a toner image forming apparatus supporting frame lower part FR1b which supports the toner image forming apparatus. The toner image forming device support frame upper portion FR1a and the toner image forming device support frame lower portion FR1b are integrally connected by a plurality of connecting screws (not shown).
On the lower surface of the lower part FR1b of the toner image forming apparatus support frame (that is, the lower surface of the toner image forming apparatus support frame FR1), supported portions H1, H2, and H3 are provided, and the supported portions H1, The mounted members S1, S2, and S3 are provided on H2 and H3.
The placement members S1, S2, S3 are connected to the upper end of the lower frame FR2, and the connection method is the same as in the first embodiment . The lower frame FR2 supports the second paper feed tray TR2 so as to be slidable. Four feet 1 are provided on the lower surface of the lower frame FR2.

( Operation of Reference Example 2 )
The center of gravity including the toner image forming apparatus support frame FR1 and the members supported by the toner image forming apparatus support frame FR1 is determined by the placement members S1, S2, S3 (the supported portions H1, H2, H3). The toner image forming apparatus supporting frame FR1 is not subjected to a torsional moment as compared with the case where the center of gravity is out of the triangle. Therefore, the reference example 2 also has the same effect as the reference example 1 .

( Reference Example 3 )
5 is a perspective view of the image forming apparatus of the present embodiment 3, a diagram of a state where the toner image forming device supporting frame and the lower frame of the image forming apparatus of the reference example 3 were separated.
In the description of the reference example 3, the same reference numerals are given to the components corresponding to the components of the reference example 1 , and the detailed description thereof is omitted.
The reference example 3 is different from the reference example 1 in the following points, but is configured in the same manner as the reference example 1 in other points.

In FIG. 5, supported portions H1, H2, and H3 having a recessed shape are formed in the lower portion of the side wall of the toner image forming apparatus support frame FR1 of Reference Example 3 . The supported portions H1, H2, and H3 are arranged at the apexes of a triangle that includes the entire center of gravity of the toner image forming apparatus support frame FR1 and the like when viewed from above and below.
Connected to the recessed supported portions H1, H2, and H3 are connecting support portions FR2a, FR2b, and FR2c protruding from the upper end of the side wall of the lower frame FR2, and four feet 1 at the lower end of the lower frame FR2. Is provided.
In the reference example 3 , the supported portions H1, H2, and H3 are recessed, but the supported portions H1, H2, and H3 are protruded downward to connect the connecting support portions FR2a, FR2b, and FR2c. It is also possible to form a concave shape and connect to the side wall of the lower frame FR2.

( Operation of Reference Example 3 )
Also in this reference example 3, the torsional moment generated by the toner image forming apparatus support frame FR1 is smaller than that in the case where the center of gravity is out of the triangle.

( Reference Example 4 )
FIG. 6 is a perspective view of the toner image forming apparatus supporting frame and the hanging frame of the image forming apparatus of Reference Example 4 of the present invention.
In the description of the reference example 4, the same reference numerals are given to the components corresponding to the components of the reference example 1 , and the detailed description thereof is omitted.
The reference example 4 is different from the reference example 1 in the following points, but is configured in the same manner as the reference example 1 in other points.

In FIG. 6, three supported portions H1, H2, and H3 are formed at the upper end of the side wall of the toner image forming apparatus support frame FR1 of Reference Example 4 . The supported portions H1, H2, and H3 are arranged at the apexes of a triangle that includes the entire center of gravity of the toner image forming apparatus support frame FR1 and the like when viewed from above and below.
The suspension frame FR2 for supporting the toner image forming apparatus support frame FR1 has two horizontal rod-shaped frame suspension members 2 and 2 on the upper portion thereof. One of the two frame suspension members 2 penetrates and supports the supported portions H1 and H2. The other one frame suspension member 2 supports the supported portion H3 via the connecting member 4.

( Operation of Reference Example 4 )
The three supported portions H1, H2, and H3 supported by the suspension frame FR2 include the toner image forming apparatus support frame FR1 and the members supported by the toner image forming apparatus support frame FR1. Are arranged at the apexes of a triangle including the center of gravity inside. Therefore, the reference example 4 also has the same effect as the reference example 1 .

( Example 1 )
FIG. 7 is a perspective view of the image forming apparatus according to the first exemplary embodiment as viewed from the lower surface side of the toner image forming apparatus support frame.
In the description of the first embodiment , components corresponding to those of the reference example 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

In FIG. 7, in the toner image forming apparatus support frame FR1 of the first embodiment , the toner image forming apparatus support frame upper part FR1a and the toner image forming apparatus support frame lower part FR1b are integrally formed by a connecting screw (not shown). It is connected. Three supported portions H0, H1, and H2 are provided on the lower surface of the toner image forming device support frame FR1 (the lower surface of the lower portion FR1b of the toner image forming device support frame), and one of the supported portions is provided. A pair of approaching hinge shaft support members 6 and 6 are fixed to H0. A hinge shaft (connecting portion) 7 welded to the central portion of the mounted member S0 that is rotated by the hinge shaft support members 6 and 6 is supported so as to be rotatable about a horizontal axis. Mounted portions 8a and 8b bent downward are formed at both ends of the rotating mounted member S0, and the lower ends thereof come into contact with the floor surface (see the frame mounting surface P shown in the figure). ing.
The pair of hinge shaft support members 6 and 6 and the hinge shaft 7 that are close to each other constitute a hinge connection structure (6 + 7).

( Operation of Example 1 )
The toner image forming device support frame FR1 is placed on the floor surface (see the frame placement surface P shown in the figure) by the placement portions 8a and 8b and S1 and S2 of the rotation placement member S0. Since the toner image forming apparatus support frame FR1 is supported in contact at four points, the posture of the toner image forming apparatus support frame FR1 is stabilized. Further, even when the toner image forming apparatus support frame FR1 is placed on a frame placing surface having a concavo-convex or inclined portion, the turning placement member S0 is rotated, so that the placement portions 8a and 8b are It is supported in contact with the frame mounting surface.
Further, in the first embodiment, the toner image forming apparatus support frame FR1 is supported by three supported portions H0, H1, and H2 (rotating placement members H0 and placement members H1 and H2). The torsional moment generated in the toner image forming apparatus support frame FR1 is reduced.

( Example 2 )
FIG. 8 is an explanatory diagram of a mounting member provided on the lower surface of the image forming apparatus according to the second embodiment .
In the description of the second embodiment, the components corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The second embodiment is different from the first embodiment in the following points, but is configured in the same manner as the first embodiment in other points.
In FIG. 8, rotational placement members (placed portions) 8 a ′ and 8 b ′ are rotatably supported at both ends of the rotational placement member S 0 of the image forming apparatus U according to the second embodiment . ing.

( Operation of Example 2 )
Also in the second embodiment, the toner image forming apparatus support frame FR1 is supported by three supported portions H0, H1, and H2 (rotating placement members H0 and placement members H1 and H2). The torsional moment generated in the toner image forming apparatus support frame FR1 is reduced. Further, even if the image forming apparatus U according to the sixth embodiment is installed on the distorted frame mounting surface P, the two rotating mounted members 8a 'and 8b' of the rotating mounted member S0 are in close contact with each other. It will be stable.

( Example 3 )
FIG. 9 is an explanatory diagram of a mounting member provided on the lower surface of the image forming apparatus according to the third embodiment .
In the description of the third embodiment, the components corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In FIG. 9, the toner image support frame is arranged such that a central portion upper surface (connecting portion) 11 of the rotating placement member S 0 is interposed via an elastic block 9 instead of the hinge shaft support members 6 and 6 of the first embodiment. It is connected (adhered) to the lower surface of the lower part FR1b. The rotation mounting member S0 can be rotated by elastic deformation of the elastic body block 9.

( Operation of Example 3 )
In Embodiment 3 as well, the toner image forming apparatus support frame FR1 is supported by three supported portions H0, H1, and H2 (rotating placement members H0 and placement members H1 and H2). The torsional moment generated in the toner image forming apparatus support frame FR1 is reduced. Further, even if the image forming apparatus U of the third embodiment is installed on the distorted frame mounting surface P, the rotating mounted members 8a 'and 8b' at both ends of the rotating mounted member S0 are in close contact with each other. Stabilize.

( Example 4 )
FIG. 10 is a perspective view of the image forming apparatus according to the fourth embodiment and corresponds to FIG. 7 of the first embodiment . FIG. 11 is an explanatory diagram of the image forming apparatus according to the fourth embodiment . FIG. 11A is a diagram illustrating a state where a paper feed tray is removed from the image forming apparatus. FIG. 11B is a diagram illustrating a frame placement in which the image forming apparatus has an inclined portion. It is explanatory drawing of the state mounted in the surface.
In the description of this fourth embodiment, the components corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The fourth embodiment is different from the first embodiment in the following points, but is configured in the same manner as the first embodiment in other points.

In FIG. 10, in the fourth embodiment , the lower wall 16 of the lower part FR1b of the toner image forming apparatus supporting frame FR1 constituting the toner image forming apparatus supporting frame FR1 is easily bent (the lower wall 16 has side walls 17, 18, 19). The supported portion H0 is arranged at a position) where only the side wall 19 is not connected to the side wall 19 (see FIG. 20). 10 and 11A, a pair of connecting portions 21 that are close to each other are formed in the central portion of the highly rigid placement member S0 having a single structure, and both ends of the placement member S0 are covered. Mounting portions 22a and 22b are formed. The pair of connecting portions 21 are screwed to the supported portion H0 that is easily bent.

( Operation of Example 4 )
As shown in FIG. 11B, on the frame mounting surface P having an inclined portion and unevenness, the supported portions H0 are bent, so that the mounted portions 22a and 22b are the frames having the inclined portions and unevenness. It is supported in contact with the mounting surface P.
Further, since the lower wall 16 of the lower portion FR1b of the toner image forming apparatus support frame is bent to absorb the stress, the stress is hardly generated on the side walls 17, 18, and 19 of the lower portion FR1b of the toner image forming apparatus support frame. The upper portion FR1a of the toner image forming apparatus supporting frame above the side walls 17, 18, and 19 is not easily bent. Therefore, the positions of the image carriers PRy to PRk and the latent image writing device ROS constituting the toner image forming device V supported by the toner image forming device support frame upper part FR1a are not displaced.

( Example 5 )
FIG. 12 is an explanatory diagram of the image forming apparatus of Example 5 , corresponding to FIG. 11 of Example 4. FIG. 12A is a perspective view seen from the lower surface side of the toner image support frame of the image forming apparatus. FIG. 12B is an explanatory diagram showing a state where the image forming apparatus is placed on a frame placement surface having an inclined portion.
In the description of the fifth embodiment , components corresponding to those of the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The fifth embodiment is different from the fourth embodiment in the following points, but is configured in the same manner as the fourth embodiment in other points.
In FIG. 12, in the fifth embodiment , through holes 16a, 16b and 16c are formed at positions adjacent to the supported portion H0 of the lower wall 16 of the toner image forming apparatus supporting frame lower portion FR1b.

( Operation of Example 5 )
In FIG. 12B, in the fifth embodiment as well, when the mounting member S0 is mounted on the frame mounting surface P having an inclined portion or unevenness, the supported portion of the lower wall 16 is formed by the through holes 16a, 16b, and 16c. Since H0 and its peripheral portion bend, the mounting portions 22a and 22b are supported in contact with the inclined and uneven frame mounting surface P as in the fourth embodiment .

( Example 6 )
FIG. 13 is an explanatory diagram of the image forming apparatus of Example 6 , corresponding to FIG. 12 of Example 5. FIG. 13A is a perspective view of the image forming apparatus as viewed from the lower surface side of the toner image support frame. FIG. 13B is an explanatory diagram of a state where the image forming apparatus is placed on a frame placement surface having an inclined portion.
In the description of the sixth embodiment , components corresponding to those of the fifth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The sixth embodiment is different from the fifth embodiment in the following points, but is configured in the same manner as the fifth embodiment in other points.
In FIG. 13, on the lower wall 16 of the toner image forming apparatus supporting frame lower part FR1b of the sixth embodiment , two supported portions H1, H2 and two portions other than the supported portions H1, H2 are provided. Connection supported portions H0a and H0b are provided. The four supported portions H0a, H0b, H1, and H2 include the toner image forming apparatus support frame FR1 and the members supported by the toner image forming apparatus support frame FR1 when viewed from above and below. Are arranged at the vertices of a quadrangle including the center of gravity inside.
Further, through holes 16a, 16b, and 16c are formed at adjacent positions of the two supported portions for connection H0a and H0b so that the supported portions for connection H0a and H0b and their adjacent portions are easily bent. Has been. The placement member S0 rotates with respect to the toner image forming apparatus support frame FR1 as the easily bent portion is bent.
Further, in order to facilitate the rotation of the placement member S0, the distance between the pair of connecting portions 21a, 21a and 21b, 21b is formed shorter than the distance between the placement portions 22a and 22b. ing.
In FIG. 13A, a pair of connecting portions 21a, 21a and 21b, 21b (a pair of one side not shown) are separated from the mounted member S0 having an integral structure of the sixth embodiment . It is connected to the supported parts H0a and H0b, respectively.

( Operation of Example 6 )
In the sixth embodiment, the four supported portions H0a, H0b, H1, and H2 are disposed at the apexes of a quadrangle including the entire center of gravity of the toner image forming device support frame FR1 and the like. The torsional moment generated in the toner image forming apparatus support frame FR1 is reduced.
Further, in FIG. 13B, in the sixth embodiment , similarly to the fifth embodiment, when the placement portions 22a and 22b of the placement member S0 are placed on the frame placement surface P having inclined portions or irregularities. Since the supported portions H0a, H0b to which the placement member S0 of the lower wall 16 is attached and the adjacent portions thereof bend, the placement portions 22a, 22b are the frames having the inclined portions or irregularities. It is supported in contact with the mounting surface P.

( Example 7 )
FIG. 14 is an explanatory diagram of the image forming apparatus according to the seventh embodiment , corresponding to FIG. 13 according to the sixth embodiment . FIG. 14A is a perspective view of the toner image forming apparatus support frame of the image forming apparatus as viewed from the lower surface side. FIG. 14B is an explanatory diagram showing a state where the image forming apparatus is placed on a frame placement surface having an inclined portion.
In the description of the seventh embodiment , components corresponding to those of the sixth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The seventh embodiment is different from the sixth embodiment in the following points, but is configured in the same manner as the sixth embodiment in other points.
In FIG. 14A, the connection supported portions H0a and H0b provided on the lower wall 16 of the toner image forming apparatus support frame lower part FR1b of the seventh embodiment are the connection supported portions H0a and H0b of the sixth embodiment. It is provided at a more distant position.
The integrally mounted member S0 of Example 7 having a shape different from that of the mounted member S0 of Example 6 is a highly rigid member and is connected to supported parts H0a for connection of the lower wall 16 at both ends thereof. , Connecting portions 21a and 21b to be screwed to H0b are formed. Two convex portions are formed in the direction away from the lower wall 16 inside the positions of the connecting portions 21a and 21b of the mounted member S0, and the mounted portion 22a is formed on the lower surface of the convex portion. , 22b.

( Operation of Example 7 )
Also in the seventh embodiment, when the placement portions 22a and 22b of the placement member S0 are placed on the frame placement surface P having unevenness or an inclined portion, the toner image forming apparatus support frame lower portion FR1b Since the connected supported portions H0a, H0b and the peripheral portions thereof are bent by the through holes 16a, 16b, 16c formed in the lower wall 16, the mounted portions 22a, 22b are the same as in the sixth embodiment. It is supported in contact with the frame mounting surface P.

( Example 8 )
FIG. 15 is an explanatory diagram of the image forming apparatus of Example 8 , corresponding to FIG. 14 of Example 7. FIG. 15A is a perspective view of the toner image support frame of the image forming apparatus as viewed from the lower surface side. FIG. 15B is an explanatory diagram of a state where the image forming apparatus is placed on a frame placement surface having an inclined portion.
In the description of the eighth embodiment , components corresponding to those of the seventh embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
Example 8 is different from Example 7 in the following points, but is configured in the same manner as Example 7 in other points.
15, the above toner image forming apparatus support frame lower part the lower wall 16 of FR1b of this embodiment 8, instead of the through-hole for facilitating flexure is not formed, the integral structure of Example 8 Bending portions (low-rigidity portions) 23 and 23 that are easily bent are formed at portions adjacent to the pair of connecting portions 21a and 21b of the mounting member S0.

(Effect of Example 8)
In the eighth embodiment, when the placement portions 22a and 22b of the placement member S0 are placed on the frame placement surface P having irregularities or inclined portions, the curved portions 23 and 23 bend. The placement portions 22a and 22b of the placement member S0 are supported in contact with the frame placement surface P.

( Reference Example 5 )
FIG. 16 is an explanatory diagram of the image forming apparatus of Reference Example 5. FIG. 16A is a perspective view of the toner image forming apparatus support frame of the image forming apparatus as viewed from the lower surface side, and FIG. It is a figure which shows the state mounted in the surface.
In the description of the reference example 5, the same reference numerals are given to the components corresponding to the components of the fourth embodiment (see FIG. 10), and the detailed description thereof is omitted.

In FIG. 16A, the toner image forming apparatus support frame FR1 of Reference Example 5 is provided with four placement members S1, S2, S3 ', and S4'. Of the four mounted members S1, S2, S3 ', S4', the lower mounted position adjustable mounted members S3 ', S4' which are two mounted members are mounted on the lower wall 16. The lower end position of the placement member S3 ', S4', which is accommodated in the placement member accommodation portions 16d, 16d, is adjustable with respect to the lower surface of the toner image forming apparatus support frame FR1. is there.
That is, in FIG. 16B, the two lower-end-position-adjustable mounted members S3 'and S4' are elastic members 26 and 26 at both ends of a vertically swinging lever 24 that is rotatably supported by the supported portion H3. The vertical position is adjusted by the swing of the vertical swing lever 24 and the elastic deformation of the elastic members 26, 26. The vertical swing lever 24 and the elastic member 26 constitute a placement member lower end position adjusting device WA.
The supported portion H3 is provided on the upper surface of the lower wall 16 of the toner image forming apparatus support frame lower portion FR1b. The supported portions H1, H2, and H3 are provided at the positions of the apexes of a triangle including the overall center of gravity of the toner image forming apparatus support frame FR1 and the like.
By the swinging of the up and down swing lever 24, the spring pressure for pressing the lower end position adjustable mount members S3 'and S4' becomes equal, and the lower end position adjustable mount members S3 'and S4' The reaction force received is even.

( Reference Example 6 )
FIG. 17 is a view showing a state where the image forming apparatus of Reference Example 6 is placed on the frame placement surface, and corresponds to FIG. 16B of Reference Example 5 .
In the description of the reference example 6, the same reference numerals are given to the components corresponding to the components of the reference example 5 , and the detailed description thereof is omitted.
The reference example 6 is different from the reference example 5 in the following points, but is configured in the same manner as the reference example 5 in other points.
In FIG. 17, in Reference Example 6 , screws (lower end position fixing members) 27 for fixing the lower end position adjustable placement members S3 ′ and S4 ′ approaching or separating from the frame placement surface P are as follows. The lower wall 16 is screwed into the placement member housing portion 16d. The screw 27 has four mounting members S1, S2, S3 ', S4' in contact with the frame mounting surface P, and the lower end surfaces of the mounting members S3 ', S4' whose both lower end positions can be adjusted. It is fixed with the reaction force received evenly. In this case, the image forming apparatus U is supported on the frame placement surface P in a stable state.

( Reference Example 7 )
18 is an explanatory diagram of a mounted member lower end position adjusting device that adjusts the lower end position of the mounted member of the image forming apparatus of Reference Example 7 , and FIG. 18A is a perspective view of the mounted member lower end position adjusting device; 18B is a cross-sectional plan view of the main part of FIG. 18A.
In FIG. 18, the toner image forming apparatus support frame FR1 of the image forming apparatus U of Reference Example 7 has a toner image forming apparatus support frame lower part FR1b, and the toner image forming apparatus support frame lower part FR1b is The lower wall 16 and the side walls 17, 18, and 19 are provided. Two placed members S1 and S2 are connected to the lower surface of the lower wall 16. The other two placement members, the lower end position adjustable placement members S3 'and S4', are disposed inside the toner image forming apparatus support frame lower portion FR1b. It is supported by one end of the placement member support levers 29a and 29b. The lower ends of the lower end position adjustable mounting members S3 'and S4' protrude downward from a through hole (not shown) in the lower wall 16 of the lower portion FR1b of the toner image forming apparatus supporting frame, and the frame mounting. It is mounted on the surface P (not shown).

The first and second placement member support levers 29a and 29b are supported on the side walls 17 and 18 of the lower portion FR1b of the toner image forming apparatus support frame so as to be rotatable about shafts 31a and 31b.
The other ends of the mounted member support levers 29a and 29b are connected to the ends of a connection lever 32, respectively. The connection lever 32 is a side wall 19 of the lower part FR1b of the toner image forming apparatus support frame. The shaft 33 is rotatably supported.
The placement member lower end surface position adjusting device WB is constituted by the components indicated by the reference numerals 29a to 31a, 29b to 31b, 32 and 33.
The four mounted members S1, S2, S3 ', S4' are members supported by the toner image forming apparatus support frame FR1 and the toner image forming apparatus support frame FR1 when viewed from above and below (see FIG. (Not shown) are arranged at the apexes of a quadrangle including the entire center of gravity including the center of gravity.

( Operation of Reference Example 7 )
In the image forming apparatus U of Reference Example 7 having the above-described configuration, when one of the lower end position-adjustable placement members S3 ′ and S4 ′ is raised, the placement member lower end surface position adjustment device WB is used. The other goes down. Therefore, when the image forming apparatus U is mounted on the frame mounting surface P, each of the lower end position-adjustable mounted members S3 'and S4' is automatically adjusted so that the force applied to the lower end surface is equalized. Adjusted. The image forming apparatus U is placed in a stable state with each of the placement members S1, S2, S3 ', S4' coming into contact with the frame placement surface P. For this reason, the weight of the image forming apparatus U is supported substantially evenly by the four connecting parts of the mounted members S1, S2 and the shafts 31a, 31b and the toner image forming apparatus support frame FR1.
Therefore, when the image forming apparatus U is mounted on the frame mounting surface P having the unevenness or the inclined portion, the torsional moment and the bending moment acting on the toner image forming apparatus support frame FR1 are small. The amount of deformation such as bending or distortion of the device support frame FR1 is reduced.

( Reference Example 8 )
FIG. 19 is an explanatory view of a mounted member lower end position adjusting device that adjusts the lower end position of the mounted member of the image forming apparatus of Reference Example 8 , and FIG. 19A is a perspective view of the mounted member lower end position adjusting device. The figure corresponding to FIG. 18A of the reference example 7 and FIG. 19B are explanatory views of the fixing method of the mounting member support lever of the mounting member lower end position adjusting device in the main part plan sectional view of FIG. 19A.
In FIG. 19A and FIG. 19B, in this reference example 8 , the side wall 18 on which the second placement member support lever 29b is rotatably supported is formed with a side wall side screw through hole 18a. An arcuate guide hole 29b1 is formed in the mounting member support lever 29b at a position corresponding to the side wall side screw through hole 18a. The shaft 31b fixed to the side wall 18 is provided with a screw mounting portion 31b1 in which a screw hole is formed. A fixing screw (lower end position fixing member) 34 passes through the side wall side screw through hole 18a and the guide hole 29b1, and is screwed into the screw hole of the screw mounting portion 31b1 of the shaft 31b.
Note that the first placement member support lever 29a is also fixed in the same configuration as the second placement member support lever 29b, and thus the description thereof is omitted.
Other configurations are the same as those of the reference example 7 shown in FIG.

( Operation of Reference Example 8 )
In the image forming apparatus U of the reference example 8, the reaction force received by the lower end surfaces of the respective lower end position adjustable placement members S3 'and S4' is automatically equalized, and the respective placement members S1 and S2. , S3 ′, S4 ′ are automatically supported in contact with the frame mounting surface P. In this state, the first and second placement member support levers 29a and 29b are fixed to the shafts 31a and 31b fixed to the side walls 17 and 18 by the fixing screws 34. For this reason, the image forming apparatus U is supported in a state in which the four fixed members S1, S2, S3 ', and S4' are in contact with the frame mounting surface P, so that an external force acts. There is little backlash.

( Reference Example 9 )
20 is an explanatory view of a mounted member lower end position adjusting device that adjusts the lower end position of the mounted member of the image forming apparatus of Reference Example 9 , and FIG. 20A is a perspective view of the mounted member lower end position adjusting device. The figure corresponding to FIG. 18A of the reference example 7 and FIG. 20B are explanatory views of the fixing method of the mounting member support lever of the mounting member lower end position adjusting device in the main part plan sectional view of FIG. 20A.
In the description of the reference example 9, the same reference numerals are given to the components corresponding to the components of the reference example 7 , and the detailed description thereof is omitted.
Reference Example 9 is different from Reference Example 7 in the following points, but is configured in the same manner as Reference Example 7 in other points.
In FIG. 20, in this reference example 9 , the first and second placement member support levers 29a and 29b and the connecting lever 32 are provided outside the side walls 17, 18, and 19 of the lower portion FR1b of the toner image forming apparatus support frame. It is supported.
Similarly to the reference example 7 , in the reference example 9, the reaction force received by the lower end surfaces of the lower end position adjustable placement members S3 'and S4' is automatically equalized, and each of the placement members S1, S2, S3 'and S4' are automatically supported in contact with the frame mounting surface P.

( Reference Example 10 )
21 is an explanatory diagram of a mounted member lower end position adjusting device that adjusts the lower end position of the mounted member of the image forming apparatus of Reference Example 10 , and FIG. 21A is a perspective view of the mounted member lower end position adjusting device. FIG. 21B is a sectional view corresponding to FIG. 20A of the reference example 9 , and FIG. 21B is a cross-sectional view of a principal part of FIG. 20A showing a state in which the mounted member support lever of the mounted member lower end position adjusting device is fixed It is.
21, in this reference example 10 , arc-shaped guide holes 29a1, 29b1 are formed in the first and second mounted member support levers 29a, 29b, and screw holes 17b, 18b ( 18b is shown). Fixing screws 34, 34 (only one shown) penetrating the guide holes 29a1, 29b1 are screwed into the screw holes 17b, 18b (only 18b shown) and fixed.
Other configurations are the same as those in Reference Example 9 .

( Operation of Reference Example 10 )
In the image forming apparatus U of Reference Example 10, the reaction force received by the lower end surfaces of the respective lower end position adjustable placement members S3 'and S4' is automatically equalized, and the respective placement member S1, S2, S3 'and S4' are automatically supported in contact with the frame mounting surface P. In this state, the first and second placement member support levers 29 a and 29 b are fixed to the side walls 17 and 18 by the fixing screws 34. For this reason, the image forming apparatus U is supported in a state in which the four fixed members S1, S2, S3 ', and S4' are in contact with the frame mounting surface P, so that an external force acts. There is little backlash.

( Reference Example 11 )
22 is an explanatory view of a lower-end-position adjustable mounting member used in the image forming apparatus of Reference Example 11. FIG. 22A is a cross-sectional view of the lower-end position adjustable mounting member, and FIG. 22B is the same as FIG. It is an exploded view of the shown lower end position adjustable mounting member.
In the description of the reference example 11, the same reference numerals are given to the components corresponding to those of the reference example 7 (see FIG. 18), and the detailed description thereof is omitted. The reference example 11 is different from the reference example 7 in the following points, but is configured in the same manner as the reference example 7 in other points.
22A, this reference example 11 is different from the reference example 7 in that the two lower end position adjustable mountable members S3 'and S4' are connected to the toner image forming apparatus support frame FR1. The configuration is the same as in Reference Example 7 .

  In FIG. 22, two lower-end-position adjustable mounting members S3 'and S4' have fluid-sealed chambers LA and LA sealed with fluid, and the lower-end positions are set by the fluid pressure in the fluid-sealed chamber LA. The toner image forming apparatus support frame FR1 is configured such that the vertical position can be adjusted with respect to the lower surface of the support frame FR1. The placement member lower end position adjusting device LR is configured by the communication passage LR that communicates the fluid sealed chambers LA, LA of the two lower end position adjustable placement members S3 ′, S4 ′.

In FIG. 22B, a screw 37 projecting upward is fixed to the upper end portion of each of the lower-end-position-adjustable placement members S3 'and S4', and the screw 37 is a lower portion of the toner image forming apparatus support frame. It is fixed to the lower wall 16 of FR1b with a nut (see FIG. 22A). The lower portions of the lower-end-position-adjustable placement members S3 'and S4' are formed to expand and contract. Each of the lower end position-adjustable mounting members S3 'and S4' is formed with connecting portions 38 and 38, and the connecting portions 38 and 38 are respectively connected to both ends of a rubber orifice pipe 39. Yes. The communication passage LR having an orifice 39a is provided in the connecting portions 38, 38 and the orifice pipe 39, and the fluid sealing of the placement members S3 ', S4' whose both lower end positions can be adjusted by the communication passage LR. The room LA communicates.
In addition, it is also possible to put a gas in the fluid sealing chamber LA and the communication path LR instead of the liquid.

( Operation of Reference Example 11 )
In Reference Example 11 having the above-described configuration, when one lower end of the lower-position-adjustable mounted members S3 ′ and S4 ′ is pressed against the frame mounting surface P, the fluid in one fluid-sealed chamber LA is discharged. The fluid flows through the communication passage LR to the other fluid tight chamber LA. At this time, the lower end of the other lower end position adjustable placement member extends downward and is pressed against the frame placement surface P. Accordingly, the lower end positions of the lower-position-adjustable placement members S3 ′ and S4 ′ are automatically adjusted so that both the lower-end positions are in contact with the frame placement surface P.
Therefore, the reaction force from the frame mounting surface P received on the lower end surfaces of the lower end position adjustable mounting members S3 ′ and S4 ′ is equalized, and the pressure applied to the lower wall 16 is also equalized. The torsional moment and bending moment acting on the lower wall 16 are small, and the deformation amount of distortion and deflection is small.

( Reference Example 12 )
FIG. 23 is an explanatory view of a lower-end-position adjustable mount member used in the image forming apparatus of Reference Example 12 , FIG. 23A is a sectional view of the lower-end position adjustable mount member, and FIG. 23B is the lower-end position adjustment. It is expansion explanatory drawing of the on-off valve of a possible mounting member.
In FIG. 23, in Reference Example 12 , a connecting pipe 41 is provided instead of the orifice pipe 39 for connecting the lower-position-adjustable placing members S3 ′ and S4 ′ of Reference Example 11 . An orifice 41 a is formed in the connection pipe 41, and the orifice 41 a is opened and closed by an on-off valve (lower end position fixing member) 42.
Reference Example 12 is configured in the same manner as Reference Example 11 in other respects.

( Operation of Reference Example 12 )
When the on-off valve 42 is opened, the liquid in the fluid-sealed chamber LA can move, so that the liquid pressure received by the lower end surfaces of the both-lower end position adjustable mounted members S3 'and S4' is automatically equalized. In addition, each of the mounted members S1, S2, S3 ′, S4 ′ is automatically supported in contact with the frame mounting surface P. In this state, when the on-off valve 42 is closed, the image forming apparatus U is supported in a state where the four fixed members S1, S2, S3 'and S4' are in contact with the frame mounting surface P. Therefore, there is little backlash even if an external force is applied.

( Reference Example 13 )
FIG. 24 is an explanatory view of a lower end position adjustable mount member used in the image forming apparatus of Reference Example 13 , and corresponds to FIG. 22A of Reference Example 11 .
In this reference example 13 , an orifice 39a is formed inside an orifice pipe 39 connecting the two lower-position-adjustable mounted members S3 'and S4', and a flow control valve 43 is arranged.
Reference Example 13 is configured in the same manner as Reference Example 11 in other respects.

( Operation of Reference Example 13 )
When a load is applied to one of the two lower end position adjustable placement members S3 'and S4' of the toner image forming apparatus support frame FR1. The hydraulic pressure in the fluid tight chamber LA of the one lower end position adjustable placement member S3 ′ increases. The liquid in the placement member S 3 ′ whose bottom position can be adjusted flows due to the increase in the hydraulic pressure, but the rapid flow of the liquid can be prevented by the orifice 39 a and the flow rate control valve 43 in the orifice pipe 39. For this reason, for example, when a large force for inclining the image forming apparatus U is instantaneously applied, the image forming apparatus U can be prevented from being largely inclined.

( Reference Example 14 )
FIG. 25 is an explanatory view of a lower-end-position adjustable mount member used in the image forming apparatus of Reference Example 14 and corresponds to FIG. 24 of Reference Example 13 .
In the reference example 14 , the connecting pipe 41 of the reference example 12 is provided on one side of the orifice pipe 39 of the reference example 13 .
Reference Example 14 is configured in the same manner as Reference Example 13 (see FIG. 24) in other respects.

( Operation of Reference Example 14 )
Similarly to the reference example 13 , the reference example 14 also has the lower end position of one of the two mounted members S3 'and S4' whose bottom end position can be adjusted by the orifices 39a and 41a in the orifice pipe 39 and the flow rate control valve 43. When a load is applied to the adjustable placement member S3 ', the liquid does not flow rapidly.
Further, when the opening / closing valve 42 is closed, the lower end position adjustable mountable members S3 'and S4' are fixed, so that the toner image forming apparatus frame FR1 does not rattle.

( Reference Example 15 )
FIG. 26 is a perspective view of the image forming apparatus of Reference Example 15 as viewed from the lower surface side.
27 is an explanatory diagram of a reaction force adjusting member that adjusts a reaction force received by the lower end of the mounting member of the image forming apparatus of Reference Example 15 , and FIG. 27A is an enlarged cross-sectional view of the main part of the reaction force adjusting member. 27B is a sectional view taken along line XXVIIB-XXVIIB in FIG. 27A, and FIG. 27C is a sectional view taken along line XXVIIC-XXVIIC in FIG. 27A.
In FIG. 26, the toner image forming apparatus support frame FR1 of the image forming apparatus U of Reference Example 18 has a toner image forming apparatus support frame upper part FR1a and a toner image forming apparatus support frame lower part FR1b. The image forming apparatus support frame lower portion FR1b has a lower wall 16 and side walls 17, 18, and 19. Four placement members S1, S2, S3, and S4 'are provided on the lower surface of the toner image forming apparatus support frame FR1. The four placement members S1, S2, S3, and S4 ′ include the toner image forming device support frame FR1 and members supported by the toner image forming device support frame FR1 when viewed from above and below. It is arranged at a vertex of a quadrangle including the entire center of gravity.

  As shown in FIGS. 27B and 27C, the side wall 17 of the lower portion FR1b of the toner image forming apparatus support frame has a substantially cylindrical shape having a detent flat surface 47a (see FIG. 27C) and an opening 47b for checking the internal state. The placement member housing member 47 is fixed. A spring accommodating portion 48 is integrally connected to the upper end of the lower-position-adjustable mounting member S4 ′, which is one of the four mounting members S1, S2, S3, S4 ′. The spring accommodating portion 48 is fitted inside the placement member accommodating member 47 so as to be movable up and down and not rotatable relative to each other. The lower end position-adjustable placement member S4 ′ has an upper end disposed inside the placement member housing member 47, and the lower end passes through the lower wall and the lower wall 16 of the placement member housing member 47. Is mounted on the frame mounting surface P.

The spring accommodating portion 48 has a spring accommodating hole 48a whose upper end is open, and a rotation stop plane 48b (see FIG. 27C) is formed in the spring accommodating hole 48a. The spring accommodating portion 48 has an opening 48c corresponding to the opening 47b.
A compression spring 49 is accommodated in the spring accommodating portion 48, and the compression spring 49 is pressed by a spring pressing portion 51 a of a spring pressing member 51. The spring pressing portion 51a is supported in the spring accommodating hole 48a so as to be vertically movable and non-rotatable. A screw part 51 b is formed on the spring pressing part 51 a, and the screw part 51 b is screwed to the knob 52. The upper end surface of the knob 52 is in contact with the upper end of the placement member housing member 47. Further, as shown in FIGS. 26 and 27B, the knob 52 includes an opening 47b (see FIGS. 27B and 27C) of the placement member receiving member 47 and a side wall 17 of the toner image forming apparatus support frame lower part FR1b. The user can operate from the opening 17a (see FIG. 26). The opening 17a is formed at a position corresponding to the openings 47b and 48c, and the lower end position of the spring pressing member 51a inside the spring accommodating portion 48 can be visually confirmed.

In FIG. 27C, the opening 47b of the mounted member housing member 47 is cut to a position corresponding to the opening 48c of the spring housing portion 48, and when the reaction force is adjusted, the opening 47b and the opening 48c The lower end position of the spring pressing portion 51a can be confirmed.
The compression spring 49, the spring pressing member 51, and the knob 52 constitute a reaction force adjusting member (49 + 51 + 52).
It should be noted that the number of placement members (placement members whose bottom position can be adjusted) S4 ′ having a structure capable of adjusting the reaction force is not limited to one, and a plurality of two or more can be provided.

( Operation of Reference Example 15 )
When the image forming apparatus U is installed on the frame mounting surface having the unevenness and the inclined portion, the lower end position of the lower end position adjustable mounting member S4 ′ is automatically adjusted, and the four supported portions S1, The lower ends of S2, S3, and S4 'are placed in contact with the frame placement surface P. When the knob 52 is rotated in this state, the spring pressing member 51 moves in the vertical direction, and the pressure of the compression spring 49 is adjusted. By adjusting the spring pressure, the reaction force received on the lower end surface of the mount member S4 ′ whose bottom position can be adjusted is adjusted, and the reaction force received on the lower surface of each of the mount members S1, S2, S3, S4 ′. The variation can be equalized. Accordingly, since the torsional moment and the bending moment acting on the toner image forming apparatus frame FR are small, the deformation amount of the toner image forming apparatus support frame FR1 is reduced.

( Reference Example 16 )
FIG. 28 is an explanatory diagram of a reaction force adjusting member that adjusts the reaction force received by the lower end of the mounting member of the image forming apparatus of Reference Example 16 , and corresponds to FIG. 27A of Reference Example 15 .
In the description of the reference example 16, the same reference numerals are given to the components corresponding to the components of the reference example 15 (see FIG. 27), and the detailed description thereof is omitted.
In this reference example 16 , a screw threaded portion 47c is formed in the lower part of the spring accommodating member 47, and a screw for fixing a placement member S4 'whose lower end position can be adjusted is fixed to the screw threaded portion 47c. 53 is screwed together.
The reference example 16 is configured in the same manner as the reference example 15 in other points.

( Operation of Reference Example 16 )
The lower end position adjustable mount member S4 'is fixed after the reaction force received by the lower end position adjustable mount member S4' by the fixing screw 53 is adjusted to a predetermined value. In this case, the toner image forming apparatus support frame FR1 is mounted on the frame in a state where reaction forces received from the frame mounting surface P of the four mounted members S1, S2, S3, and S4 'are equalized. Supported on the surface P.

( Reference Example 17 )
FIG. 29 is an explanatory diagram of a reaction force adjusting member that adjusts the reaction force received by the lower end of the mounting member of the image forming apparatus of Reference Example 17 , and corresponds to FIG. 27A of Reference Example 15 .
In the description of the reference example 17, the same reference numerals are given to the components corresponding to the components of the reference example 15 , and the detailed description thereof is omitted.
The reference example 17 is different from the reference example 15 in the following points, but is configured in the same manner as the reference example 15 in other points.

In the reference example 17 , a standard indicator 54a and an option indicator 54b are provided on the surface of the placement member S4 ′ whose lower end position can be adjusted adjacent to the opening 48c. The standard index 54a is an index indicating the magnitude of the reaction force received by the lower end position adjustable mount member S4 'in the case of standard specifications in which an optional device (not shown) is not attached to the image forming apparatus U. The option index 54b is an index indicating the magnitude of the reaction force received by the lower end position adjustable mount member S4 'in the case of an optional specification in which an option apparatus is attached to the image forming apparatus U.
An opening 47b (see FIG. 27C) is formed on the outer surface of the placement member receiving member 47 so that the positions of the lower surfaces of the indicators 54a and 54b and the spring pressing portion 51a can be seen.
The indicators 54a and 54b can be provided on the outer surface of the side wall 17, and can be color-coded.

( Operation of Reference Example 17 )
The knob 52 is rotated to adjust the position of the lower surface of the spring pressing portion 51a to the standard indicator 54a or the option indicator 54b according to the standard specification or the option specification. By this operation, the reaction force received by the lower-end-position-adjustable mounted member S4 'pressed against the compression spring 49 is adjusted, and the reaction received by the lower-end surface of each of the mounted members S1, S2, S3, S4'. Power is equalized.

( Reference Example 18 )
FIG. 30 is an explanatory diagram of a reaction force adjusting member that adjusts the reaction force received by the lower end of the mounting member of the image forming apparatus of Reference Example 18 , and corresponds to FIG. 29 of Reference Example 17 .
In the description of the reference example 18, the same reference numerals are given to the components corresponding to the components of the reference example 17 , and the detailed description thereof is omitted.
The reference example 18 is different from the reference example 17 in the following points, but is configured in the same manner as the reference example 17 in other points.
In the reference example 18 , each lower end position adjustable placement member S4 ′ is fixed to the screw threaded portion 47c of the placement member receiving member 47 fixed to the lower wall 16 with a fixing screw (lower end position fixing member) 56. Fixed.

( Operation of Reference Example 18 )
In this reference example 18 , after the reaction force received by the lower end position adjustable mount member S4 'is adjusted to a predetermined value, the lower end position adjustable mount member S4' is fixed. In this state, the toner image forming apparatus support frame FR1 of Reference Example 18 is supported on the frame mounting surface P in a state where the reaction force received from the frame mounting surface P is equalized. The deformation of the forming apparatus support frame FR1 can be reduced.

( Reference Example 19 )
FIG. 31 is a perspective view of the toner image forming apparatus support frame of the image forming apparatus of Reference Example 19 of the present invention and a suspension frame that supports the toner image forming apparatus support frame.
In the description of the reference example 19, the same reference numerals are given to the components corresponding to the components of the reference example 4 (see FIG. 6), and the detailed description thereof is omitted.
The reference example 19 is different from the reference example 4 in the following points, but is configured in the same manner as the reference example 4 in other points.
In FIG. 31, the toner image forming apparatus support frame FR1 of Reference Example 19 is supported at the apex of a rectangle including the entire center of gravity of the toner image forming apparatus support frame FR1 and the like when viewed from above and below. Portions H1, H2, H3, and H4 are provided. Of the four supported portions H1, H2, H3, and H4, one supported portion H4 is an elastic supported portion H4, and the elastic supported portion H4 includes a spring (elastic member) 61. And is supported by the frame suspension member 2 of the suspension frame FR2. The supported portions H1, H2, and H3 are also supported by the frame suspension member 2.

( Operation of Reference Example 19 )
In the image forming apparatus U of Reference Example 19 having the above-described configuration, the toner image forming apparatus support frame FR1 has three supported portions H1, H2, and H3 and one elastic supported portion H4. The elastic supported portion H4 is supported by the suspension frame P via a spring 61. Therefore, when a force for deforming the toner image forming apparatus support frame FR1 is applied, the spring 61 is elastically deformed to prevent the toner image forming apparatus support frame FR1 from being deformed.

( Reference Example 20 )
FIG. 32 is an explanatory diagram of the image forming apparatus of Reference Example 20 , and FIG. 32A is a view of the toner image forming apparatus support frame of the image forming apparatus as viewed from the lower surface side, and corresponds to FIG. 10 of the fourth embodiment . 32B is a partial cross-sectional view as seen from the arrow XXXIIB in FIG. 32A and corresponds to FIG. 11B of the fourth embodiment .
In the description of the reference example 20 , components corresponding to those of the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The reference example 20 is different from the fourth embodiment in the following points, but is configured in the same manner as the fourth embodiment in other points.

In FIG. 32A, the toner image forming device support frame FR1 and the toner image forming device support frame FR1 of the toner image forming device support frame FR1 of Reference Example 20 are supported by the toner image forming device support frame FR1 and the toner image forming device support frame FR1. Mounted members S1, S2, and S3 are respectively fixed to supported portions H1, H2, and H3 disposed at the apexes of a triangle including the entire center of gravity including the formed member, and the triangle Movable mounted members S4 and S5 are arranged on the outer elastic supported portions H4 and H5. The elastic supported portions H4 and H5 are provided on the periphery of the opening at the lower end portion of the lower portion FR1b of the toner image forming apparatus support frame (see FIG. 32B only for the elastic supported portion H5).
That is, in FIG. 32B, a leg accommodating member 62 that accommodates each movable supported member S5 is fixed to the elastic supported portion H5, and the movable supported member S5 is connected to the leg portion. The spring (elastic member) 63 in the housing member 62 is pressed in a direction approaching the frame mounting surface P. The movable supported member S4 of the elastically supported portion H4 is also pressed in the direction approaching the frame mounting surface P with the same configuration as the movable supported member S5.

( Operation of Reference Example 20 )
When a downward load is applied to the toner image forming apparatus support frame FR1 on the side where the movable mount members S4 and S5 are provided, the toner image forming apparatus support frame FR1 is mounted on the mount members S1, S2,. In addition to S3, the movable mounting members S4 and S5 are also supported by the frame mounting surface P, so that the posture is stabilized. At this time, since the impact when the load is applied is absorbed by the spring 63, the impact is not transmitted to the toner image forming device support frame FR1, and the movable placement members S4 and S5 are moved to the frame placement surface. Since it is pressed by P, rattling is unlikely to occur.

(Example of change)
As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various change is performed within the range of the summary of this invention described in the claim. It is possible. Modified embodiments of the present invention are illustrated below.
(H01) In the reference example 19 (see FIG. 31), the three supported portions H1, H2, and H3 include a toner image forming apparatus support frame FR1 and a member supported by the toner image forming apparatus support frame FR1. It is possible to arrange at the apex of a triangle that includes the entire center of gravity.
(H02) The present invention is applicable to an image forming apparatus that directly transfers a toner image on an image carrier onto a recording sheet.
(H03) The present invention is applicable to an image forming apparatus including a sheet conveying belt that conveys a recording sheet to transfer areas of a plurality of image carriers.

FIG. 1 is a front sectional view of Reference Example 1 of the image forming apparatus of the present invention. FIG. 2 is an explanatory diagram showing a state in which the toner image forming apparatus supporting frame and the lower frame of the image forming apparatus according to the first embodiment of the present invention are connected, and is a portion surrounded by a thick line of the image forming apparatus of FIG. . FIG. 3 is an explanatory view of a mounting member provided on the lower surface of the toner image forming apparatus support frame and an explanatory view of a connecting portion between the mounting member and the lower frame, and FIG. 3A is a support of the toner image forming apparatus. Explanatory drawing of the mounting member provided in the flame | frame, FIG. 3B is principal part expansion explanatory drawing of the said connection part. Figure 4 is a perspective view of an image forming apparatus of the present reference example 2 is a diagram of a state where the toner image forming device supporting frame and the lower frame of the image forming apparatus according to the Reference Example 2 were separated. Figure 5 is a perspective view of an image forming apparatus of the present reference example 3, a diagram of a state where the toner image forming device supporting frame and the lower frame of the image forming apparatus of the reference example 3 were separated. 6 is a perspective view of a toner image forming apparatus support frame and hanging the frame of the image forming apparatus of Example 4 of the present invention. FIG. 7 is a perspective view of the image forming apparatus according to the first exemplary embodiment as viewed from the lower surface side of the toner image forming apparatus support frame. FIG. 8 is an explanatory diagram of a mounting member provided on the lower surface of the image forming apparatus according to the second embodiment . FIG. 9 is an explanatory diagram of a mounting member provided on the lower surface of the image forming apparatus according to the third embodiment . Figure 10 is a perspective view of an image forming apparatus in Embodiment 4 is a view corresponding to FIG. 7 of the first embodiment. FIG. 11 is an explanatory diagram of the image forming apparatus according to the fourth embodiment . FIG. 11A is a diagram illustrating a state in which a paper feed tray is removed from the image forming apparatus. FIG. It is explanatory drawing of the state mounted in the surface. FIG. 12 is an explanatory diagram of the image forming apparatus of Example 5 , corresponding to FIG. 11 of Example 4. FIG. 12A is a perspective view seen from the lower surface side of the toner image support frame of the image forming apparatus. FIG. 12B is an explanatory diagram showing a state where the image forming apparatus is placed on a frame placement surface having an inclined portion. FIG. 13 is an explanatory diagram of the image forming apparatus of Example 6 , corresponding to FIG. 12 of Example 5. FIG. 13A is a perspective view of the image forming apparatus as viewed from the lower surface side of the toner image support frame. FIG. 13B is an explanatory diagram of a state where the image forming apparatus is placed on a frame placement surface having an inclined portion. FIG. 14 is an explanatory diagram of the image forming apparatus according to the seventh embodiment , corresponding to FIG. 13 according to the sixth embodiment . FIG. 14A is a perspective view of the toner image forming apparatus support frame of the image forming apparatus as viewed from the lower surface side. FIG. 14B is an explanatory diagram showing a state where the image forming apparatus is placed on a frame placement surface having an inclined portion. FIG. 15 is an explanatory diagram of the image forming apparatus of Example 8 , corresponding to FIG. 14 of Example 7. FIG. 15A is a perspective view of the toner image support frame of the image forming apparatus as viewed from the lower surface side. FIG. 15B is an explanatory diagram of a state where the image forming apparatus is placed on a frame placement surface having an inclined portion. FIG. 16 is an explanatory diagram of the image forming apparatus of Reference Example 5 , corresponding to FIG. 11 of Example 4. FIG. 16A is a perspective view of the toner image forming apparatus support frame of the image forming apparatus as viewed from the lower surface side. FIG. 16B is a diagram illustrating a state where the image forming apparatus is placed on the frame placement surface. FIG. 17 is a view showing a state where the image forming apparatus of Reference Example 6 is placed on the frame placement surface, and corresponds to FIG. 16B of Reference Example 5 . 18 is an explanatory diagram of a mounted member lower end position adjusting device that adjusts the lower end position of the mounted member of the image forming apparatus of Reference Example 7 , and FIG. 18A is a perspective view of the mounted member lower end position adjusting device; 18B is a cross-sectional plan view of the main part of FIG. 18A. FIG. 19 is an explanatory view of a mounted member lower end position adjusting device that adjusts the lower end position of the mounted member of the image forming apparatus of Reference Example 8 , and FIG. 19A is a perspective view of the mounted member lower end position adjusting device. The figure corresponding to FIG. 18A of the reference example 7 and FIG. 19B are explanatory views of the fixing method of the mounting member support lever of the mounting member lower end position adjusting device in the main part plan sectional view of FIG. 19A. 20 is an explanatory view of a mounted member lower end position adjusting device that adjusts the lower end position of the mounted member of the image forming apparatus of Reference Example 9 , and FIG. 20A is a perspective view of the mounted member lower end position adjusting device. The figure corresponding to FIG. 18A of the reference example 7 and FIG. 20B are explanatory views of the fixing method of the mounting member support lever of the mounting member lower end position adjusting device in the main part plan sectional view of FIG. 20A. 21 is an explanatory diagram of a mounted member lower end position adjusting device that adjusts the lower end position of the mounted member of the image forming apparatus of Reference Example 10 , and FIG. 21A is a perspective view of the mounted member lower end position adjusting device. FIG. 21B is a sectional view corresponding to FIG. 20A of the reference example 9 , and FIG. 21B is a cross-sectional view of a principal part of FIG. 20A showing a state in which the mounted member support lever of the mounted member lower end position adjusting device is fixed. It is. 22 is an explanatory view of a lower-end-position adjustable mounting member used in the image forming apparatus of Reference Example 11. FIG. 22A is a cross-sectional view of the lower-end position adjustable mounting member, and FIG. 22B is the same as FIG. It is an exploded view of the shown lower end position adjustable mounting member. FIG. 23 is an explanatory view of a lower-end-position adjustable mount member used in the image forming apparatus of Reference Example 12 , FIG. 23A is a cross-sectional view of the lower-end position adjustable mount member, and FIG. 23B is the lower-end position. It is expansion explanatory drawing of the on-off valve of an adjustable mounting member. FIG. 24 is an explanatory view of a lower end position adjustable mount member used in the image forming apparatus of Reference Example 13 , and corresponds to FIG. 22A of Reference Example 11 . FIG. 25 is an explanatory view of a lower-end-position adjustable mount member used in the image forming apparatus of Reference Example 14 and corresponds to FIG. 24 of Reference Example 13 . FIG. 26 is a perspective view of the image forming apparatus of Reference Example 15 as viewed from the lower surface side. 27 is an explanatory diagram of a reaction force adjusting member that adjusts a reaction force received by the lower end of the mounting member of the image forming apparatus of Reference Example 15 , and FIG. 27A is an enlarged cross-sectional view of the main part of the reaction force adjusting member. 27B is a sectional view taken along line XXVIIB-XXVIIB in FIG. 27A, and FIG. 27C is a sectional view taken along line XXVIIC-XXVIIC in FIG. 27A. FIG. 28 is an explanatory diagram of a reaction force adjusting member that adjusts the reaction force received by the lower end of the mounting member of the image forming apparatus of Reference Example 16 , and corresponds to FIG. 27A of Reference Example 15 . FIG. 29 is an explanatory diagram of a reaction force adjusting member that adjusts the reaction force received by the lower end of the mounting member of the image forming apparatus of Reference Example 17 , and corresponds to FIG. 27A of Reference Example 15 . FIG. 30 is an explanatory diagram of a reaction force adjusting member that adjusts the reaction force received by the lower end of the mounting member of the image forming apparatus of Reference Example 18 , and corresponds to FIG. 29 of Reference Example 17 . FIG. 31 is a perspective view of the toner image forming apparatus support frame of the image forming apparatus of Reference Example 19 of the present invention and a suspension frame that supports the toner image forming apparatus support frame. FIG. 32 is an explanatory diagram of the image forming apparatus of Reference Example 20 , and FIG. 32A is a view of the toner image forming apparatus support frame of the image forming apparatus as viewed from the lower surface side, and corresponds to FIG. 10 of the fourth embodiment . 32B is a partial cross-sectional view as seen from the arrow XXXIIB in FIG. 32A and corresponds to FIG. 11B of the fourth embodiment .

FR1 ... toner image forming device support frame,
FR2 ... lower frame, hanging frame,
FR2a: Frame support member,
H1, H2, H3; H0; H0a, H0b ... supported parts,
H4, H5 ... elastically supported parts,
S1, S2, S3; S0 ... Mounted member,
S3 ′, S4 ′: Placed member whose bottom position can be adjusted,
P: Frame mounting surface,
U: Image forming apparatus,
V: toner image forming apparatus,
WA; WB; LR ... Mounted member lower end position adjusting device,
6 + 7 ... hinge connection structure,
7; 11; 21; 21a, 21b ... connecting part,
8a, 8b; 8a ′, 8b ′; 22a, 22b.
9 ... elastic block,
27; 34; 42; 56 ... lower end position fixing member,
61; 63 ... elastic member (spring),
(49 + 51 + 52) ... Reaction force adjusting member.

Claims (2)

A toner image forming apparatus support frame for supporting a toner image forming apparatus having at least an image carrier and a latent image writing device for forming a latent image corresponding to an image signal on the image carrier;
A mounting device that supports the toner image forming apparatus support frame and is configured separately from the toner image forming apparatus support frame and supported by a supported portion disposed on a lower wall of the toner image forming apparatus support frame. A lower frame that supports the member;
Bei to give a,
The toner image forming apparatus support frame;
The lower wall;
A plurality of side walls connected to the lower wall;
It has a pair of mounting parts connected via a connecting part, and is attached at a plurality of locations to the supported part arranged at a position not connected to any of the side walls of the lower wall. One mounted member,
Two mounted members attached at positions connected to any of the side walls of the lower wall;
An image forming apparatus comprising: 2. The image forming apparatus according to claim 1, wherein the toner image forming apparatus support frame includes a plurality of image carriers arranged in parallel to a surface placed on the lower frame.

Images