JP5240386B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

As techniques relating to conventional image forming apparatuses such as electrophotographic copying machines, printers, and fax machines, techniques described in Patent Documents 1 to 3 below are known.
Patent Document 1 (Japanese Patent Laid-Open No. 4-212973) discloses a latent image forming apparatus that forms a latent image on the surface of an image carrier, and a large number of light emitting units are arranged close to the surface of the image carrier and along the axial direction. A latent image forming apparatus, that is, a so-called LED array type exposure apparatus is described. In the technique described in Patent Document 1, when the process unit 30 including the photosensitive belt 101 as an image holding member is attached to and detached from the image forming apparatus main body, in conjunction with opening and closing of the door 35 for the process unit 101, The LED head 7 </ b> A disposed close to the lower side of the photosensitive belt 101 is separated from the photosensitive belt 101.

In the technique described in Patent Document 2 (Japanese Patent Application Laid-Open No. 2000-293085), the LED array 2 arranged close to the photosensitive member 1 is normally moved above the photosensitive member 1 by the biasing mechanism 40. The operation lever 41 is arranged at a position that holds the state in which the photosensitive member 1 is inserted and prevents the insertion and removal of the photosensitive member 1. In the technique described in Patent Document 2, the operation lever 41 is rotated to pull up the LED array 2 via the connecting piece 46 to separate the LED array 2 from the photoreceptor 1 and to the photoreceptor 1 by the operation lever 41. The hindrance to insertion / extraction of is removed.
In Patent Document 3 (Japanese Patent Laid-Open No. 2001-175046), a first position where the LED array head 39 is positioned at a certain distance from the photosensitive drum 19 and a second position separated from the photosensitive drum 19 are disclosed. In addition, the conveyance belt 15 that conveys the medium is configured to be movable between a facing position facing the photosensitive drum 19 and a retracted position away from the photosensitive drum 19. The technology is described. In the technique described in Patent Document 3, when the photosensitive drum 19 is removed for replacement, the LED array head 39 is separated from the photosensitive member 1 in conjunction with the movement of the transport belt 15 to the retracted position. Move to position 2. Further, after the photosensitive drum 19 is mounted, the transport belt 15 is moved to the facing position, and the LED array head 39 is moved to the first position close to the photosensitive drum 19 in conjunction with this operation. .

JP-A-4-212973 ("0026" to "0038", FIGS. 1 to 3) JP 2000-293085 A ("0020" to "0022", FIGS. 2 to 4) JP 2001-175046 A ("0028" to "0036", "0041", FIG. 1, FIG. 2, FIG. 6, FIG. 7)

  SUMMARY OF THE INVENTION An object of the present invention is to prevent positional displacement of a latent image forming apparatus with respect to an image holding member, which is caused by positioning a developing device after positioning the latent image forming device with respect to the image holding member.

In order to solve the technical problem, an image forming apparatus according to claim 1 is provided.
An image carrier,
A latent image forming device;
A developer,
A first contact / separation mechanism for moving the developing device between a position in contact with the image carrier and a position away from the image carrier;
A position where the first contact / separation mechanism contacts the image carrier from a position away from the image carrier after moving the developing device to a position where the developer comes into contact with the image carrier. A second contact / separation mechanism to move to
It is provided with.

According to a second aspect of the present invention, in the image forming apparatus according to the first aspect,
An image carrier unit having an image carrier and detachable from the image forming apparatus main body;
A positioning unit of the latent image forming apparatus that is provided in the latent image forming apparatus and contacts the part of the image carrier unit to position the latent image forming apparatus;
A positioning unit of the developing unit that is provided in the developing unit and positions the developing unit by contacting a part of the image carrier unit;
The latent image forming apparatus includes a position where the positioning unit of the latent image forming apparatus is in contact with a part of the image holding unit and a position where the positioning unit of the latent image forming apparatus is in contact with the image holding unit. The second contact / separation mechanism for moving between the position separated from the image carrier in a state of being separated from a part of the image carrier unit;
The developing unit is positioned at a position where the positioning unit of the developing unit is in contact with a part of the image carrier unit, and the positioning unit of the developing unit is a part of the image carrier unit. The first contact / separation mechanism for moving between the position separated from the image holding body and the position separated from the image holding member;
It is provided with.

According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect,
A position where the latent image forming apparatus is supported by the outer frame body of the latent image forming apparatus so as to be relatively movable, and a position where the latent image forming apparatus is in contact with the image holding body; And a second contact / separation mechanism having a moving member movable between
A contact member for interlocking supported by the developing device, and a contact member for interlocking disposed corresponding to the contacted member for interlocking and supported by the second contact / separation mechanism, The interlocking mechanism having the interlocking contact member that moves in conjunction with the movement of the moving member and moves the contacted member for interlocking;
It is provided with.

According to a fourth aspect of the present invention, in the image forming apparatus according to the third aspect,
In a state where the latent image forming apparatus is moved to a position in contact with the image holding body and the developing unit is moved to a position in contact with the image holding body, the latent image forming apparatus is separated from and opposed to the contacted member for interlocking. The interlocking contact member arranged,
It is provided with.

According to a fifth aspect of the present invention, in the image forming apparatus according to any one of the first to fourth aspects,
The latent image forming apparatus having a light irradiation unit for irradiating image writing light for forming a latent image, and an outer frame;
An operation member that is supported by the outer frame and that is movable between a position that restricts insertion / removal of the image holding body and a position that allows insertion / removal of the image holding body; The operation member that moves the latent image forming device to a position in contact with the image holding member and moves the latent image forming device to a position separated from the image holding member at a position where the latent image forming device can be inserted and removed. The contact and separation mechanism of
It is provided with.

According to a sixth aspect of the present invention, in the image forming apparatus according to the fifth aspect,
The operating member that is rotatably supported by the outer frame body and is supported so as to be movable between a position that restricts the insertion and extraction and a position that can be inserted and removed, and the outer frame body that is connected to the operating member and that is connected to the outer frame body A moving member supported to be movable relative to the moving member, a moving direction conversion member connected to the moving member and converting relative movement of the moving member into a rotational movement, and a moving member connected to the moving direction conversion member; A second contact / separation mechanism having a contact / separation member that supports the light irradiating unit so as to be able to approach and separate from the image carrier;
It is provided with.

According to a seventh aspect of the present invention, in the image forming apparatus according to the sixth aspect,
A rotating shaft member formed on the operating member;
An operation connecting member rotatably supported by the operation member and rotatably supported by the moving member, wherein the operation member is between a position where the insertion / removal is possible and a position where the insertion / removal is restricted. The operation connecting member in which a dead point is set on a path through which the rotary shaft member passes while contacting the outer surface of the operation connecting member while moving,
It is provided with.

According to the first aspect of the present invention, the positional shift of the latent image forming apparatus with respect to the image holding member, which is generated by positioning the developing device after positioning the latent image forming device with respect to the image holding member, is corrected. It can reduce compared with the case where invention is not employ | adopted.
According to the second aspect of the present invention, the position of the latent image forming apparatus with respect to the image holding body generated by positioning the developing device after positioning the latent image forming apparatus with respect to the insertable / removable image holding body. The deviation can be reduced as compared with the case where the present invention is not adopted.
According to the third aspect of the present invention, the interlocking contact member that moves in conjunction with the moving member of the second contact / separation mechanism moves in conjunction with the developing device on which the interlocked contacted member is supported. Can be made.

According to the fourth aspect of the present invention, the vibration due to the driving of the developing device at the position where the latent image forming apparatus contacts the image holding member and the position where the developing device contacts the image holding member is coupled with the interlocked object. Transmission through the contact member and the interlocking contact member can be prevented. That is, it is possible to prevent the latent image formation in the latent image forming apparatus from being adversely affected by vibration.
According to the fifth aspect of the present invention, the light irradiating part can be moved closer to and away from the image carrier by operating the operation member.
According to the sixth aspect of the present invention, the movement of the moving member can be converted into the movement of the contact / separation member by the conversion member in the moving direction, and the light irradiation section can be moved closer to and away from the image carrier.
According to the seventh aspect of the present invention, the operation member passing through the dead point is held at a position where insertion / removal is restricted or a position where insertion / removal is possible, and a position where the latent image forming apparatus contacts the image carrier Can be kept at a position separated from the position.

FIG. 1 is an overall explanatory view of an image forming apparatus according to Embodiment 1 of the present invention. FIG. 2 is an enlarged explanatory view of a main part of the image forming apparatus according to the first embodiment. FIG. 3 is an explanatory view for explaining the relationship among the image carrier, the latent image forming apparatus, and the developing device in the image forming apparatus of Embodiment 1 of the present invention. FIG. 3A shows that the developing device has moved to the developing device contact position. FIG. 3B is a diagram illustrating a state in which the latent image forming apparatus has moved to the latent image forming apparatus contact position, and FIG. 3B illustrates a state in which the developing unit has moved to the developing unit separation position and the latent image forming apparatus has moved to the latent image forming apparatus separation position. FIG. 4A and 4B are perspective explanatory views of the latent image forming apparatus according to the first exemplary embodiment, FIG. 4A is an explanatory view showing a state in which the latent image forming apparatus has moved to the latent image forming apparatus contact position, and FIG. It is explanatory drawing of the state which moved to the formation apparatus separation position. 5A and 5B are explanatory views of the outer frame body of the latent image forming apparatus according to the first embodiment. FIG. 5A is a plan view and FIG. 5B is a side view. FIG. 6 is an explanatory view for explaining the positional relationship between the latent image forming apparatus and the image carrier in Example 1, and FIG. 6A is an explanatory view showing a state in which the latent image forming apparatus has moved to the latent image forming apparatus contact position. FIG. 6B is an explanatory diagram of a state in which the latent image forming apparatus has moved to the latent image forming apparatus separation position. FIG. 7 is an explanatory view of a main part of the contact / separation mechanism of the latent image forming apparatus according to the first embodiment in which a part of the outer frame body is omitted from the state shown in FIG. 4, and FIG. 7A is a latent image forming apparatus. FIG. 7B is an explanatory diagram of a state in which the latent image forming apparatus has moved to the latent image forming apparatus separation position. 8A and 8B are explanatory views of the operation connecting member of the latent image forming apparatus according to the first embodiment, FIG. 8A is a perspective view, and FIG. 8B is a side view. 9A and 9B are explanatory views of a moving member of the latent image forming apparatus according to the first exemplary embodiment. FIG. 9A is a perspective view and FIG. 9B is a side view. FIG. 10 is an enlarged view of a main part of the interlocking contact member of the latent image forming apparatus according to the first embodiment. 11A and 11B are explanatory views of a moving direction conversion member of the latent image forming apparatus of Example 1, FIG. 11A is a perspective view, and FIG. 11B is a side view. 12A and 12B are explanatory views of the interlocking contact member provided in the latent image forming apparatus of Example 1, FIG. 12A is a perspective view, and FIG. 12B is a side view. 13A and 13B are explanatory views of the contact / separation member of the latent image forming apparatus of Example 1, FIG. 13A is a perspective view, FIG. 13B is a side view, and FIG. 13C is a plan view. FIG. 14 is an explanatory diagram of an image writing light irradiation unit of the latent image forming apparatus of Example 1, FIG. 14A is a perspective view, and FIG. 14B is a side view. FIG. 15 is an explanatory diagram of the positional relationship between the image carrier and the latent image forming apparatus of Example 1, FIG. 15A is a top view, and FIG. 15B is a side view. FIG. 16 is a diagram for explaining the operation when the latent image forming apparatus and the developing device of Example 1 are separated from the image holding member. FIG. 16A shows a state immediately after the operation member starts moving from the normal position to the insertable / removable position. FIG. 16B is an explanatory diagram of a state where it has further moved from the state shown in FIG. 16A to the insertable / removable position side, and FIG. 16C is an explanatory diagram of a state where the operation member has moved to the insertable / removable position. FIG. 17 is an operation explanatory diagram when the latent image forming apparatus and the developing device of Example 1 are brought close to the image holding member, FIG. 17A is an explanatory diagram of a state where the operation member has been moved to the insertable / removable position, and FIG. FIG. 17C is an explanatory diagram of a state immediately after the operating member starts to move to the normal position side from the state shown in FIG. 17A, and FIG. 17C is an explanatory diagram of a state in which the operating member has moved further to the normal position side from the state shown in FIG. FIG. 18 is an explanatory diagram of the positional relationship between the image carrier and the latent image forming apparatus according to the first embodiment. 19 is an explanatory diagram of the latent image forming apparatus according to the second embodiment. FIG. 19A is an explanatory diagram corresponding to FIG. 6A of the first embodiment, and FIG. 19B is an explanatory diagram corresponding to FIG. 6B of the first embodiment. 20A and 20B are explanatory diagrams of the image forming apparatus according to the third exemplary embodiment. FIG. 20A is an explanatory diagram of the transfer apparatus contact position and the latent image forming apparatus contact position. FIG. 20B is an explanatory diagram of the transfer apparatus separation position and the latent image formation apparatus separation position. FIG. FIG. 21 is an explanatory diagram of the positional relationship between the image carrier, the latent image forming apparatus, and the primary transfer unit according to the third embodiment, and corresponds to FIG. 3A according to the first embodiment. FIG. 22 is an explanatory diagram of the image forming apparatus according to the fourth exemplary embodiment. FIG. 22A is an explanatory diagram illustrating a state in which the latent image forming apparatus has moved to the latent image forming apparatus contact position and the developer has moved to the developer contact position. 22B is an explanatory view of the state in which the latent image forming apparatus has moved to the latent image forming apparatus separation position and the developing unit has moved to the developer contact position, and FIG. 22C has the latent image forming apparatus moved to the latent image forming apparatus separation position; FIG. 6 is an explanatory diagram of a state where the developing device has moved to a developing device separation position.

Next, examples which are specific examples of embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.
In order to facilitate understanding of the following description, in the drawings, the front-rear direction is the X-axis direction, the left-right direction is the Y-axis direction, the up-down direction is the Z-axis direction, and arrows X, -X, Y, -Y, The direction indicated by Z and -Z or the indicated side is defined as the front side, the rear side, the right side, the left side, the upper side, the lower side, or the front side, the rear side, the right side, the left side, the upper side, and the lower side, respectively.
In the figure, “•” in “○” means an arrow heading from the back of the page to the front, and “×” in “○” is the front of the page. It means an arrow pointing from the back to the back.
In the following description using the drawings, illustrations other than members necessary for the description are omitted as appropriate for easy understanding.

FIG. 1 is an overall explanatory view of an image forming apparatus according to Embodiment 1 of the present invention.
In FIG. 1, the image forming apparatus U includes an automatic document feeder U1 and an image forming apparatus body U2 that supports the automatic document feeder U1 and has a transparent document reading surface PG at the upper end.
The automatic document feeder U1 includes a document feeding unit TG1 that stores a plurality of documents Gi to be copied, and a document feeding unit TG1 that is fed from the document feeding unit TG1 and passes a document reading position on the document reading surface PG. And a document discharge portion TG2 from which the document Gi conveyed is discharged.
The image forming apparatus main body U2 includes an operation unit UI through which a user inputs an operation command signal for starting an image forming operation, an exposure optical system A, and the like.

Reflected light from a document conveyed on the document reading surface PG by the automatic document feeder U2 or a document manually placed on the document reading surface PG is passed through the exposure optical system A by the solid-state image sensor CCD. It is converted into red R, green G, and blue B electrical signals.
The image information conversion unit IPS converts RGB electrical signals input from the solid-state imaging device CCD into black K, yellow Y, magenta Y, and cyan C image information and temporarily stores them. At the timing, it is output to the latent image forming apparatus driving circuit DL as image information for forming a latent image.
When the original image is a single color image, so-called monochrome, image information of only black is input to the latent image forming device drive circuit DL.
The latent image forming device drive circuit DL has drive circuits (not shown) for the respective colors Y, M, C, and K, and signals corresponding to the inputted image information are arranged for each color at a predetermined time. Output to the image forming apparatuses LHy, LHm, LHc, and LHk.

FIG. 2 is an enlarged explanatory view of a main part of the image forming apparatus according to the first embodiment.
Visible image forming devices Uy, Um, Uc, Uk arranged at the center of the image forming device U in the direction of gravity are devices for forming toner images of yellow, magenta M, cyan C, and black K, respectively. is there.
The Y, M, C, and K latent image writing lights Ly, Lm, Lc, and Lk emitted from the laser diodes of the latent image forming devices LHy to LHk are respectively rotated image carriers PRy, PRm, PRc, and PRk. Is incident on. In Example 1, the latent image forming apparatuses LHy to LHk are configured by so-called LED arrays.
The Y visible image forming device Uy includes a rotating image carrier PRy, a charger CRy, a latent image forming device LHy, a developing device Gy, a transfer device T1y, and an image carrier cleaner CLy.
The visible image forming apparatuses Um, Uc, Uk are all configured in the same manner as the Y visible image forming apparatus Uy.

1 and 2, the image carriers PRy, PRm, PRc, and PRk are charged by their respective chargers CRy, CRm, CRc, and CRk, and then at image writing positions Q1y, Q1m, Q1c, and Q1k. An electrostatic latent image is formed on the surface of the latent image writing light Ly, Lm, Lc, Lk. The electrostatic latent images on the surfaces of the image carriers PRy, PRm, PRc, and PRk are developed in the developing regions Q2y, Q2m, Q2c, and Q2k, as developing roller as an example of a developer carrier of the developing devices Gy, Gm, Gc, and Gk. A toner image as an example of a visible image is developed with the developer held in GRy, GRm, GRc, GRk.
The developed toner image is conveyed to primary transfer regions Q3y, Q3m, Q3c, and Q3k that are in contact with an intermediate transfer belt B as an example of an intermediate transfer member. The primary transfer units T1y, T1m, T1c, and T1k disposed on the back side of the intermediate transfer belt B in the primary transfer regions Q3y, Q3m, Q3c, and Q3k are supplied with a predetermined value from a power supply circuit E controlled by the control unit C. At this timing, a primary transfer voltage having a polarity opposite to the charging polarity of the toner is applied.
The toner images on the image carriers PRy to PRk are primarily transferred to the intermediate transfer belt B by the primary transfer units T1y, T1m, T1c, and T1k. Residual toner on the surface of the image carrier PRy, PRm, PRc, PRk after the primary transfer is cleaned by the image carrier cleaner CLy, CLm, CLc, CLk. The cleaned surfaces of the image carriers PRy, PRm, PRc, and PRk are recharged by the chargers CRy, CRm, CRc, and CRk.

  Above the image carriers PRy to PRk, a belt module BM as an example of an intermediate transfer device that can move up and down and can be pulled out forward is disposed. The belt module BM includes an intermediate transfer belt B as an example of an intermediate transfer member, a belt drive roll Rd as an example of an intermediate transfer member drive member, a tension roll Rt as an example of an intermediate transfer member stretching member, and a meander prevention A belt support roll Rd + Rt + Rw + Rf + T2a as an example of an intermediate transfer member support member including a walking roll Rw as an example of a member, an idler roll Rf as an example of a driven member, and a backup roll T2a as an example of a secondary transfer region facing member; Primary transfer devices T1y, T1m, T1c, and T1k are included. The intermediate transfer belt B is rotatably supported by the belt support roll Rd + Rt + Rw + Rf + T2a.

A secondary transfer roll T2b as an example of a secondary transfer member is disposed facing the surface of the intermediate transfer belt B in contact with the backup roll T2a, and a secondary transfer device T2 is configured by the rolls T2a and T2b. ing. Further, a secondary transfer region Q4 is formed in a region where the secondary transfer device T2b and the intermediate transfer belt B face each other.
The single-color or multi-color toner images transferred in succession on the intermediate transfer belt B by the transfer devices T1y, T1m, T1c, and T1k in the primary transfer areas Q3y, Q3m, Q3c, and Q3k are transferred to the secondary transfer area Q4. It is conveyed to.

  Below the visible image forming apparatuses Uy to Uk, a pair of left and right guides as an example of a guide member that supports paper feed trays TR1 to TR3 as an example of a paper feed container so as to be able to enter and exit in the front-rear direction (X-axis direction). Three guide rails GR and GR are provided. A recording sheet S as an example of a medium accommodated in the paper feed trays TR1 to TR3 is taken out by a pickup roll Rp as an example of a medium takeout member and separated one by one by a separating roll Rs as an example of a medium separating member. The The recording sheet is transported along a sheet transport path SH, which is an example of a medium transport path, by a plurality of transport rolls Ra, which is an example of a medium transport member, and is disposed upstream of the secondary transfer region Q4 in the sheet transport direction. In addition, the image is sent to a registration roll Rr as an example of a transfer region conveyance timing adjusting member. A sheet conveying device SH + Ra + Rr is configured by the sheet conveying path SH, the sheet conveying roll Ra, the registration roll Rr, and the like.

The registration roll Rr conveys the recording sheet S to the secondary transfer area Q4 in time with the toner image formed on the intermediate transfer belt B being conveyed to the secondary transfer area Q4.
When the recording sheet S passes through the secondary transfer area Q4, the backup roll T2a is grounded, and the secondary transfer unit T2b is charged with toner at a predetermined timing from the power supply circuit E controlled by the control unit C. A secondary transfer voltage having the opposite polarity is applied. At this time, the color toner image on the intermediate transfer belt B is 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 as an example of an intermediate transfer body cleaner.

The recording sheet S on which the toner image is secondarily transferred has a fixing region Q5 which is a pressure contact region of a heating roll Fh as an example of a heating fixing member of the fixing device F and a pressure roll Fp as an example of a pressing fixing member. And heated and fixed when passing through the fixing region. The heat-fixed recording sheet S is discharged from a discharge roller Rh as an example of a medium discharge member to a discharge tray TRh as an example of a medium discharge portion.
Note that a release agent for improving the releasability of the recording sheet S from the heating roll is applied to the surface of the heating roll Fh by a release agent application device Fa.

  Above the belt module BM, developer cartridges Ky, Km, Kc, and Kk are disposed as an example of a developer supply container that stores yellow Y, magenta M, cyan C, and black K developers. The developer contained in each developer cartridge Ky, Km, Kc, Kk is supplied from the developer supply path (not shown) to each developer Gy according to the consumption of the developer in the developers Gy, Gm, Gc, Gk. , Gm, Gc, Gk. In Example 1, the developer is composed of a two-component developer including a magnetic carrier and a toner provided with an external additive.

In FIG. 1, the image forming apparatus U includes an upper frame UF and a lower frame LF, and the upper frame UF includes the visible image forming apparatuses Uy to Uk and the visible image forming apparatus Uy. A member arranged above -Uk, that is, a belt module BM and the like are supported.
The lower frame LF includes a guide rail GR that supports the paper feed trays TR1 to TR3 and the paper feed members that feed paper from the trays TR1 to TR3, that is, a pickup roll Rp, a separation roll Rs, A sheet conveying roll Ra and the like are supported.

(Description of each member of the visible image forming apparatus)
FIG. 3 is an explanatory view for explaining the relationship among the image carrier, the latent image forming apparatus, and the developing device in the image forming apparatus of Embodiment 1 of the present invention. FIG. 3A shows that the developing device has moved to the developing device contact position. FIG. 3B is a diagram illustrating a state in which the latent image forming apparatus has moved to the latent image forming apparatus contact position, and FIG. 3B illustrates a state in which the developing unit has moved to the developing unit separation position and the latent image forming apparatus has moved to the latent image forming apparatus separation position. FIG.
Next, the developing devices Gy, Gm, Gc, Gk and the latent image forming devices LHy, LHm, LHc, LHk constituting the visible image forming devices Uy, Um, Uc, Uk according to the first embodiment of the present invention will be described. However, since the members of the respective colors are configured in the same manner, only the Y color will be described, and a detailed description of the other colors will be omitted.

(Explanation of developer)
In FIG. 3, the developing device Gy of Example 1 has a developing container 1 in which a developer is accommodated. In the developing container 1, a pair of agitating and conveying members 2 and 3 that convey the developer inside while being agitated are rotatably supported. The developer container 1 has a developer holding body 4 that holds the developer stirred by the stirring and conveying members 2 and 3 on the surface and conveys the developer to a developing area Q2y that is an area facing the image holding body PRy. It is rotatably supported.
In FIG. 3, the developing container 1 is supported by a frame (not shown), that is, a so-called developing unit frame so as to be rotatable about a rotating shaft 6. One end of a developer urging member 7 that constantly urges the developer holding body 4 toward the image holding body PRy is supported on the outer wall of the developing container 1 on the side opposite to the image holding body PRy with respect to the rotation shaft 6. ing. Therefore, the developer holding body 4 receives a force in a direction in which the developer holding body 4 is always pressed against the image holding body PRy. The developer holding body 4 includes a developer area abutting portion (not shown) disposed at both ends of the developer holding body 4 as a developer positioning portion, a so-called tracking portion, and a developer holding body 4 and an image holding body. The interval from 1 is maintained at a predetermined interval. That is, during normal times, the developing device Gy is held at the developing device contact position shown in FIG. 3A. When an external force that rotates the developing device Gy in a direction away from the image carrier PRy is applied, the developing device Gy is separated from the image carrier PRy against the force of the developing device biasing member 7. In other words, the rotating shaft 6 and the developing device urging member 7 constitute the developing device contacting / separating mechanism (6 + 7) of the first embodiment.
An interlocking contacted member 8 extending to the latent image forming apparatus Lhy side is supported on the outer wall of the developing container 1 on the latent image forming apparatus LHy side. Further, a leakage prevention member 9 that contacts the surface of the image carrier PRy and prevents the developer from leaking downward is supported below the developer carrier 4 of the developer container 1.

(Description of latent image forming apparatus)
4A and 4B are perspective explanatory views of the latent image forming apparatus according to the first exemplary embodiment, FIG. 4A is an explanatory view showing a state in which the latent image forming apparatus has moved to the latent image forming apparatus contact position, and FIG. It is explanatory drawing of the state which moved to the formation apparatus separation position.
5A and 5B are explanatory views of the outer frame body of the latent image forming apparatus according to the first embodiment. FIG. 5A is a plan view and FIG. 5B is a side view.

In FIG. 4, the latent image forming apparatus LHy of Example 1 includes an outer frame body 11 that is fixedly supported by screws on the image forming apparatus body U <b> 2. In FIG. 5, the outer frame body 11 has a bottom wall 11a extending in the front-rear direction, which is the axial direction of the image carrier PRy, and a left side wall 11b and a right side wall 11c extending upward from both left and right ends of the bottom wall 11a. . A pair of hole-shaped biasing member one end support portions 11d are formed at both front and rear ends of the bottom wall 11a.
4 and 5, a fixed portion 11e extending downward is formed on the lower surfaces of the front end portions of the left and right side walls 11b and 11c, and the image forming apparatus main body is formed by a hole 11e1 formed in the fixed portion 11e. Screwed to U2. A pair of front and rear interlocking contact member outer through portions 11f are formed in the right side wall 11c, and the interlocking contact member outer through portion 11f of the first embodiment is formed by an arc-shaped long hole. A pair of front and rear rotating shaft support portions 11g is formed in the upper portion of the interlocking contact member outer through-hole 11f. A pair of left and right operation member rotation support portions 11h is formed at the front end portions of the left and right side walls 11b and 11c, and the operation member rotation support portion 11h according to the first embodiment is configured by a through hole.

FIG. 6 is an explanatory view for explaining the positional relationship between the latent image forming apparatus and the image carrier in Example 1, and FIG. 6A is an explanatory view showing a state in which the latent image forming apparatus has moved to the latent image forming apparatus contact position. FIG. 6B is an explanatory diagram of a state in which the latent image forming apparatus has moved to the latent image forming apparatus separation position.
FIG. 7 is an explanatory view of a main part of the contact / separation mechanism of the latent image forming apparatus according to the first embodiment in which a part of the outer frame body is omitted from the state shown in FIG. 4, and FIG. 7A is a latent image forming apparatus. FIG. 7B is an explanatory diagram of a state in which the latent image forming apparatus has moved to the latent image forming apparatus separation position.
4 and 7, the operation member 12 is supported by the operation member rotation support portion 11h of the outer frame 11 so as to be rotatable about the rotation shaft member 12a. The operating member 12 has a gripping portion 12b that is gripped and operated by a user. By operating the gripping portion 12b by gripping the operating member 12, the operating member 12 can be operated as shown in FIGS. 4A, 6A, and 7A. It is supported movably between a normal position rotated upward and an insertable / removable position rotated forward shown in FIGS. 4B, 6B, and 7B. As shown in FIG. 6A, in the first embodiment, in the normal position, the operation member 12 has the grip portion 12b disposed in front of the image holding body PRy in the axial direction, and the axial direction of the image holding body PRy. The movement, that is, the attachment / detachment of the image carrier PRy with respect to the image forming apparatus main body U2 is restricted.

8A and 8B are explanatory views of the operation connecting member of the latent image forming apparatus according to the first embodiment, FIG. 8A is a perspective view, and FIG. 8B is a side view.
In FIG. 4, between the right side wall 11c of the outer frame 11 and the operation member 12, an operation connecting member 13 that contacts the rotary shaft member 12a is disposed. 7 and 8, the operation connecting member 13 is constituted by a connecting arm extending in the front-rear direction, and a rotation support portion 13a that is rotatably supported by the operation member 12 is formed at the front end portion. ing. In FIG. 7, a concave shaft coupling recess 13 b is formed at the rear end of the operation coupling member 13. Note that a dead center 13c is set on an extension of an imaginary line connecting the center of the arc of the arc-shaped portion of the shaft coupling recess 13b and the center of the rotated support portion 13a. As shown in FIGS. While the member 12 moves between the normal position and the insertable / removable position, the rotating shaft member 12a of the operating member 12 is dead center 13c, that is, the arc center of the arc-shaped portion of the shaft connecting recess 13b, and the rotated support portion 13a. And the center of the rotary shaft member 12a are set so as to pass through a position aligned on a straight line.

9A and 9B are explanatory views of a moving member of the latent image forming apparatus according to the first exemplary embodiment. FIG. 9A is a perspective view and FIG. 9B is a side view.
7 and 9, a moving member 14 is disposed on the rear end side of the operation connecting member 13. The moving member 14 is housed inside the outer frame body 11 and supported so as to be movable in the front-rear direction. A shaft support portion 14 a is formed at the front end of the moving member 14 so as to correspond to the shaft connection recess 13 c of the operation connection member 13. A connecting shaft 16 shown in FIG. 7 is supported on the shaft support portion 14a, and the connecting shaft 16 is connected by being fitted into a shaft connecting recess 13c.
7 and 9, the moving member 14 has a pair of front and rear interlocking contact member through-holes 14 b formed by square holes corresponding to the interlocking contact member outer through-holes 11 f of the outer frame body 11. Has been. Further, a pair of front and rear rotating shaft through portions 14c for changing direction formed by long holes in the front-rear direction are formed above the interlocking contact member inner through portion 14b corresponding to the rotating shaft support portion 11g. ing.

FIG. 10 is an enlarged view of a main part of the interlocking contact member of the latent image forming apparatus according to the first embodiment.
11A and 11B are explanatory views of a moving direction conversion member of the latent image forming apparatus of Example 1, FIG. 11A is a perspective view, and FIG. 11B is a side view.
In FIG. 7, a pair of front and rear moving direction conversion members 17 are arranged on the inner side of the moving member 14 so as to correspond to the rotation shaft penetrating portion 14 c for direction conversion. The moving direction changing member 17 has a direction changing rotary shaft support portion 17a formed in a rear upper portion thereof, and the direction changing rotary shaft support portion 17a has a direction changing rotary shaft penetrating portion formed by a long hole. The rotating shaft 18 for direction conversion supported by the rotating shaft support part 11g of the outer frame 11 penetrates 14c. That is, the moving direction conversion member 17 is supported so as to be rotatable with respect to the outer frame 11 with the direction conversion rotary shaft 18 as a rotation center. In the first embodiment, when the moving member 14 moves relative to the outer frame body in the front-rear direction, the direction converting rotary shaft 18 passes through the direction converting rotary shaft penetrating portion 14c formed by a long hole. Therefore, the moving range of the moving member 14 is restricted by the direction changing rotary shaft 18 and the direction changing rotary shaft penetrating portion 14c as shown in FIG.

  10 and 11, a contact / separation member connecting portion 17 b formed by a long hole in the front-rear direction is formed at the front upper portion of the movement direction conversion member 17, and at the rear lower portion of the movement direction conversion member 17. The interlocking contact member support portion 17c is formed. A biasing member other end support portion 17d is formed diagonally forward and downward of the interlocking contact member support portion 17c. 5 and 10, a biasing spring 19 as an example of a latent image forming device biasing member is provided between the biasing member one end support portion 11 d and the biasing member other end support portion 17 d of the outer frame body 11. Is installed. The biasing spring 19 applies a force that always pulls the biasing member other end support portion 17d toward the biasing member one end support portion 11d. That is, the moving direction conversion member 17 is urged by the urging spring 19 in the direction in which the contact / separation member connecting portion 17b rotates upward about the direction conversion rotating shaft 18.

12A and 12B are explanatory views of the interlocking contact member provided in the latent image forming apparatus of Example 1, FIG. 12A is a perspective view, and FIG. 12B is a side view.
7 and 10, the interlocking contact member 21 is supported on the interlocking contact member support portion 17 c of the moving direction conversion member 17. In FIG. 12, the interlocking contact member 21 is formed integrally with a trapezoidal contact member body 21a, a supported portion 21b extending rearward from the rear surface of the contact member body 21a, and an upper portion of the contact member body 21a. And an interlocking contact portion 21c. The supported portion 21b passes through the interlocking contact member outer through portion 11f of the outer frame body 11 and the interlocking contact member inner through portion 14b of the moving member 14, and cannot rotate to the interlocking contact member support portion 17c. Mounted in a state. Therefore, the interlocking contact member 21 is configured to be rotatable integrally with the movement direction conversion member 17. Further, in the first embodiment, the supported portion 21b is formed in a rotating shaft shape, and is formed to have a smaller diameter than the interlocking contact member outer through-hole 11f and the interlocking contact member inner through-hole 14b and has play. It penetrates in the state.

Therefore, when the moving member 14 moves, the interlocking contact member inner through-hole 14b and the supported portion 21b come into contact with each other, and when the moving member 14 further moves, the moving direction conversion member 17 is attached to the biasing spring 19. The contact / separation member connecting portion 17b rotates downward against the force. Further, in a normal state, the supported portion 21b that rotates integrally with the moving direction conversion member 17 pushes the interlocking contact member inner through portion 14b forward by the urging force of the urging spring 19, so that the connecting shaft 16 Moves toward the shaft coupling recess 13c, and the coupling between the operation coupling member 13 and the moving member 14 is maintained.
In FIG. 3A, the contact member main body 21a and the interlocking contact portion 21c of the interlocking contact member 21 are arranged on the developing device Gy side outside the outer frame 11, and the interlocking contacted member 8 extending from the developing device Gy. An interlocking contact portion 21c is disposed below the bottom.
The interlocking contact member 21 and the interlocked contacted member 8 constitute the interlocking mechanism (8 + 21) of the first embodiment.

13A and 13B are explanatory views of the contact / separation member of the latent image forming apparatus of Example 1, FIG. 13A is a perspective view, FIG. 13B is a side view, and FIG. 13C is a plan view.
7 and 10, a contact / separation member 22 is disposed on the left side of the movement direction conversion member 17. In FIG. 13, the contact / separation member 22 has a contact / separation member body 22a extending in the front-rear direction. At both front and rear end portions of the contact / separation member main body 22a, connection members 22b protruding toward the movement direction conversion member 17 are supported at positions corresponding to the contact / separation member connection portions 17b of the movement direction conversion member 17. The connecting member 22b is connected to the contacting / separating member connecting portion 17b formed by a long hole in a state of being fitted with play. Accordingly, when the surface of the contacting / separating member connecting portion 17b comes into contact with the connecting member 22b as the moving direction converting member 17 rotates, it is pushed and moved in the vertical direction, that is, in the direction approaching or separating from the image carrier PRy. Moving. Further, light irradiation unit support portions 22 c are formed on the upper surfaces of the front and rear end portions of the contact / separation member 22. Further, an escape hole 22d constituted by a long hole extending in the vertical direction is formed on the right side of the light irradiation unit support portion 22c, and the escape hole 22d escapes the inner end of the rotating shaft 18 for direction conversion. ing.

FIG. 14 is an explanatory diagram of an image writing light irradiation unit of the latent image forming apparatus of Example 1, FIG. 14A is a perspective view, and FIG. 14B is a side view.
7 and 10, an image writing light irradiation unit 23 is supported on the light irradiation unit support portion 22 c of the contact / separation member 22. The image writing light irradiation unit 23 includes an irradiation unit main body 23a that extends in the front-rear direction, and a light irradiation unit that is supported by the irradiation unit main body 23a and is disposed to face the image carrier PRy and irradiates latent image writing light. 23b. In Example 1, a light source for forming a latent image on the surface of the image carrier PRy is arranged in the light irradiation unit 23b side by side in the axial direction of the image carrier PRy, that is, in the main scanning direction. The irradiation unit 23b is configured by a so-called LED array.

FIG. 15 is an explanatory diagram of the positional relationship between the image carrier and the latent image forming apparatus of Example 1, FIG. 15A is a top view, and FIG. 15B is a side view.
6, 14, and 15, the abutting portions 23 c projecting upward are formed at both front and rear end portions of the irradiation unit main body 23 a, and projecting upward on both front and rear sides of the abutting portion 23 c. A pair of front and rear positioning portions 23d is formed. In FIG. 15, the abutting portion 23 c is abutted against the bearing members 24 disposed at both ends of the image holding member PRy at the latent image forming device contact position, and is positioned in the vertical direction. In FIG. 15, when the latent image forming apparatus LHy moves from the latent image forming apparatus separation position shown in FIG. 15B to the latent image forming apparatus contact position, the front-side positioned object supported by the front end portion of the image carrier supporting frame body 26. The positioning slot 23d on the front side penetrates the positioning groove 26b formed in the section 26a, and the positioning slot formed in the rear positioning section 26c supported by the rear end of the image carrier supporting frame 26 The rear positioning portion 23d passes through 26d, and the latent image forming apparatus LHy is positioned in the front-rear direction and the left-right direction with respect to the image carrier PRy.

Thereby, at the latent image forming apparatus contact position shown in FIG. 6A, the positional relationship between the light irradiation unit 23b and the surface of the image holding member PRy is held in a predetermined positional relationship, and latent image writing irradiated from the light irradiation unit 23b is performed. The focal point of the light is accurately held so as to be on the surface of the image carrier PRy.
In the image forming apparatus U according to the first exemplary embodiment, as illustrated in FIG. 3A, the virtual line 27 is connected to the virtual line 27 that connects the light irradiation unit 23 b and the center of the image carrier PRy at the latent image forming apparatus contact position. 27, the image carrier PRy and the intermediate transfer belt B are in contact with each other, and the primary transfer device T1y is disposed at a position shifted downstream in the rotation direction of the intermediate transfer belt B.
The outer frame 11, the operation member 12, the operation connecting member 13, the moving member 14, the shafts 16 and 18, the moving direction changing member 17, the biasing spring 19, the supported portion 21 b, the contacting / separating member 22, etc. One latent image forming apparatus contact / separation mechanism (11-22) is configured.

(Operation of Example 1)
In the image forming apparatus U according to the first embodiment having the above-described configuration, as illustrated in FIGS. 3A and 6A, in the state where the operation member 12 is moved to the upper normal position, the moving direction is generated by the biasing force of the biasing spring 19. The moving member 14 is held forward via the conversion member 17. As a result, the contact / separation member 22 is held upward, and the light irradiation part 23b of the image writing light irradiation unit 23 is held in a state of being arranged at a predetermined interval on the image carrier PRy. That is, the latent image forming apparatus LHy having the members 12 to 23 is held at the latent image forming apparatus contact position and is in a state where a latent image can be formed. The developing unit Gy is held by the developing unit urging member 7 at a predetermined developer unit contacting position that approaches and opposes the image holding member PRy at a predetermined interval. At this time, the interlocking contact member 21c and the interlocked contacted member 8 are held in a separated state, and the vibration generated when the developer holder 4 of the developing device Gy is rotationally driven during the image forming operation causes latent vibration. Transmission to the image forming apparatus LHy is prevented, and accurate latent image formation is executed by the latent image forming apparatus LHy.

(Explanation of separation operation of latent image forming apparatus and developing unit)
FIG. 16 is a diagram for explaining the operation when the latent image forming apparatus and the developing device of Example 1 are separated from the image holding member. FIG. 16A shows a state immediately after the operation member starts moving from the normal position to the insertable / removable position. FIG. 16B is an explanatory diagram of a state where it has further moved from the state shown in FIG. 16A to the insertable / removable position side, and FIG.
When the image carrier PRy is replaced due to wear, deterioration, failure, or the like, since the movement of the image carrier PRy is restricted by the operation member 12, the operation member 12 is first rotated. In FIG. 16A and FIG. 16B, the operation connecting member 13 connected by the rotation support portion 13a moves so as to be pushed backward by the rotation of the operation member 12 around the rotation shaft member 12a. Due to the movement of the operation connecting member 13, the moving member 14 moves backward via the connecting shaft 16. As the moving member 14 moves rearward, the interlocking contact member inner through portion 14b of the moving member 14 contacts the supported portion 21b of the interlocking contact member 21, and the supported portion 21b moves rearward. As a result, the moving direction changing member 17 to which the supported portion 21 b is connected rotates about the direction changing rotary shaft 18 against the urging force of the urging spring 19.

  At this time, as shown in FIGS. 16A and 16B, when the moving direction changing member 17 rotates and there is no play with the connecting member 22b of the contacting / separating member 22, the contacting / separating member connecting portion 17b becomes the connecting member. 22b is pushed down. As the connecting member 22b moves downward, the contact / separation member 22 starts to descend, and the image writing light irradiation unit 23 starts moving in a direction away from the image carrier PRy. On the other hand, the interlocking contact member 21 that rotates integrally with the rotation of the moving direction converting member 17 rotates and contacts the interlocked contacted member 8 that has been separated.

In FIG. 16B and FIG. 16C, when the operation member 12 further rotates and the movement direction conversion member 17 rotates, the interlocking contact member 21 contacts the interlocked contacted member 8 and pushes upward, and the developing device Gy The movement starts in the direction away from the image carrier PRy about the rotation shaft 6 against the urging force of the developing unit urging member 7.
In FIG. 3B, FIG. 6B, and FIG. 16C, when the operation member 12 moves to the insertable / removable position, the latent image forming device LHy moves to the latent image forming device separation position separated from the image carrier PRy, and the developing device Gy The developer moves to a developing device separation position separated from the holding body PRy. In this state, the image carrier PRy can be extracted and inserted without the surface being in contact with the latent image forming apparatus LHy or the developing device Gy. At this time, since the rotating shaft member 12a of the operating member 12 exceeds the dead point 13c, the operating connecting member 13 receives a force that pushes the operating connecting member 13 forward by the biasing force of the biasing spring 19, and the operating member 12 is operated. A force that moves downward of the connecting member 13 is naturally received. As a result, the operation member 12 is automatically held at the insertable / removable position unless the user applies a force and moves it to the normal position side.

(Explanation of approaching operation of latent image forming apparatus and developing unit)
FIG. 17 is an operation explanatory diagram when the latent image forming apparatus and the developing device of Example 1 are brought close to the image holding member, FIG. 17A is an explanatory diagram of a state where the operation member has been moved to the insertable / removable position, and FIG. FIG. 17C is an explanatory diagram of a state immediately after the operating member starts to move to the normal position side from the state shown in FIG. 17A, and FIG. 17C is an explanatory diagram of a state in which the operating member has moved further to the normal position side from the state shown in FIG.
In FIG. 17, when the replacement of the image carrier PRy is completed, the operation member 12 is returned from the insertable / removable position to the normal position. At this time, when the movement of the operating member 12 is started, the shaft connecting recess 13c of the operating connecting member 13 moves in a direction away from the connecting shaft 16, but the moving member 14 is moved forward by the biasing force of the biasing spring 19. It moves and the connection of the operation connecting member 13 and the moving member 14 is maintained. As the moving member 14 moves forward, the interlocking contact member inner through portion 14b comes into contact with the supported portion 21b of the interlocking contact member 21, and the supported portion 21b moves forward. As a result, the moving direction changing member 17 to which the supported portion 21b is connected also rotates about the direction changing rotary shaft 18.

At this time, as shown in FIG. 17B, since the contact / separation member connecting portion 17b and the connection member 22b are fitted with play, the contact / separation member 22 hardly moves until play is eliminated. On the other hand, the interlocking contact member 21 that rotates integrally with the rotation of the moving direction conversion member 17 rotates and starts moving in a direction away from the interlocked contacted member 8. When the interlocking contact member 21 moves away from the interlocking contacted member 8, the developing device Gy has the image carrier PRy about the rotation shaft 6 by the biasing force of the developing device biasing member 7 of the developing device Gy. Start moving in the direction approaching.
In FIG. 17C, when the operation member 12 further rotates and the movement direction conversion member 17 rotates, there is no play between the contact / separation member connection portion 17b and the connection member 22b, and the contact / separation member connection portion 17b moves the connection member 22b upward. Push up. As the connecting member 22b moves upward, the contacting / separating member 22 starts to rise, and the image writing light irradiation unit 23 starts moving in a direction approaching the image carrier PRy.

  As the operation member 12 moves to the normal position, the developing device Gy and the latent image forming device LHy approach the image carrier PRy. When the developing device Gy is abutted against the image carrier PRy by the developing device urging member 7, the developing container 1 does not rotate any more, and the interlocking contact member 8 of the interlocking contacted member 8 by the developing device urging member 7 is stopped. The pressing to 21 is released. That is, the developing device Gy is held in a state of being moved to the developing device contact position. When the interlocking contact member 21 and the interlocked contacted member 8 start to separate, the abutting portion 23c of the latent image forming apparatus LHy is in a state before being abutted against the bearing member 24.

  In FIG. 6B, after the developing device Gy moves to the developing device contact position, when the operation member 12 further rotates and moves to the normal position, the moving member 14 moves forward by the urging force of the urging spring 19 and moves. The direction changing member 17 further rotates. Accordingly, the interlocking contact member 21 and the interlocking contacted member 8 are separated from each other. At this time, the abutting portion 23c of the latent image forming apparatus LHy is abutted against the bearing member 24, the latent image forming apparatus LHy moves to the latent image forming apparatus contact position, and the pair of front and rear positioning portions 23d are respectively positioned grooves. 26b and the positioning long hole 26d are positioned.

FIG. 18 is an explanatory diagram of the positional relationship between the image carrier and the latent image forming apparatus according to the first embodiment.
That is, in Example 1, as shown by the solid line in FIG. 18, the latent image forming device LHy is abutted and positioned in a state where the developing device Gy is abutted against the image carrier PRy. Therefore, as shown by the broken line in FIG. 18, when the developing device Gy is abutted against the image carrier PRy after the latent image forming device LHy is positioned with respect to the image carrier PRy, the image carrier The position of the latent image forming device LHy with respect to PRy is shifted, the interval between the latent image forming device LHy and the image holding member PRy is slightly changed, or the latent image forming device LHy is inclined with respect to the image holding member PRy. Occurrence is prevented.

  In the first embodiment, when the image carrier PRy is replaced, the intermediate transfer belt B and the primary transfer device T1y are configured to approach and separate from the image carrier PRy, thereby forming a latent image. The apparatus LHy and the developing device Gy are configured to move independently from each other. In the first embodiment, the primary transfer device T1y is configured to be able to approach and separate from the image carrier PRy in a state where the latent image forming device LHy and the developing device Gy are moved to the contact positions. At this time, in the first embodiment, the arrangement position of the primary transfer unit T1y is arranged at a position shifted to the downstream side with respect to the contact position between the image carrier PRy and the intermediate transfer belt B. Even if the image carrier PRy is approached or separated from the image carrier PRy, the image carrier PRy is not pressed against the image carrier PRy. For this reason, even if the primary transfer unit T1y moves from the transfer unit separation position to the transfer unit contact position after the latent image forming device LHy is positioned with respect to the image holding unit PRy, the position of the image holding unit PRy varies. First, the positional relationship between the latent image forming device LHy and the image holding member PRy is held in an accurate positional relationship.

Next, the second embodiment of the present invention will be described. In the description of the second embodiment, the same reference numerals are given to the components corresponding to the components of the first embodiment, and the detailed description thereof will be given. 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.
19 is an explanatory diagram of the latent image forming apparatus according to the second embodiment. FIG. 19A is an explanatory diagram corresponding to FIG. 6A of the first embodiment, and FIG. 19B is an explanatory diagram corresponding to FIG. 6B of the first embodiment.

In FIG. 19, in the latent image forming apparatus LHy ′ according to the second embodiment, the interlocking contact member 21 according to the first embodiment is omitted, and the movement member 14 corresponding to the supported portion 21 b and the movement direction conversion member 17 are connected. A connecting member 31 is provided. The moving member 14 includes an interlocking contact member 21 ′ that penetrates the outer frame body 11 and protrudes toward the developing device at a position shifted in the front-rear direction from the interlocking contact member 21 ′ of the first embodiment. It is integrally formed. The interlocking contact member 21 'has a contact portion 21c' that inclines downward as it goes rearward.
In the second embodiment, the position of the interlocked contacted member 8 is also shifted from the position of the first embodiment corresponding to the position of the interlocking contact member 21 '. In Embodiment 2, as shown in FIG. 19A, the interlocking contact member 21 ′ and the interlocking contacted member 8 are held in a state of being separated in the front-rear direction at the latent image forming apparatus contact position. In the separated position, as shown in FIG. 19b, the contacted member 8 is set to be held in a state of being pushed upward by the inclined interlocking contact member 21 ′.
Although not shown, the interlocking contact member outer through-hole 11f is also formed longer in the front-rear direction along the moving direction of the moving member 14 than in the first embodiment.
The interlocking mechanism of the second embodiment is constituted by the interlocking contact member 21 ′, the interlocked contacted member 8 and the like. Further, in addition to the moving member 14, the moving direction changing member 17, and the like, the moving connecting member 31 constitutes the latent image forming apparatus contacting / separating mechanism of the second embodiment.

(Operation of Example 2)
In the image forming apparatus U according to the second embodiment having the above-described configuration, the moving member 14 moves in the front-rear direction in conjunction with the rotational movement of the operation member 12, and the moving direction connected to the moving member 14 by the moving connecting member 31. The contact / separation member 22 moves up and down via the conversion member 17, and the image writing light irradiation unit 23 approaches and separates from the image carrier PRy.
When the operation member 12 is moved from the normal position toward the insertable / removable position, the contact portion 21c ′ comes into contact with the interlocked contacted member 8 as the moving member 14 moves rearward, and the inclined surface is used. Pushed upward, the developing device Gy moves to the developing device separation position. In the second embodiment, the interlocking contact member 21 ′ and the interlocking target member at the contact position of the latent image forming apparatus are arranged so that the developing device Gy is abutted before the latent image forming apparatus LHy is abutted against the image carrier PRy. The distance from the contact member 8 and the amount of play between the contact / separation member connecting portion 17b and the connecting member 22b are set.

Next, the third embodiment of the present invention will be described. In the description of the third embodiment, the same reference numerals are given to the components corresponding to the components of the first and second embodiments, and the detailed description thereof will be made. Description is omitted.
The third embodiment is different from the first and second embodiments in the following points, but is configured in the same manner as the first and second embodiments in other points.
20A and 20B are explanatory diagrams of the image forming apparatus according to the third exemplary embodiment. FIG. 20A is an explanatory diagram of the transfer apparatus contact position and the latent image forming apparatus contact position. FIG. 20B is an explanatory diagram of the transfer apparatus separation position and the latent image formation apparatus separation position. FIG.
FIG. 21 is an explanatory diagram of the positional relationship between the image carrier, the latent image forming apparatus, and the primary transfer unit according to the third embodiment, and corresponds to FIG. 3A according to the first embodiment.

  In FIG. 20, in the image forming apparatus U according to the third exemplary embodiment, the belt module BM supports a transfer body contacting / separating operation member 41 rotatably on a frame body, that is, a front end wall of the frame. The transfer unit contacting / separating operation unit 41 includes a gripping unit 41a extending in the left-right direction for a user to grip and operate, and operates the transfer unit contacting / separating operation member 41 by gripping the gripping unit. By this, it is configured to be movable between the normal position shown in FIG. 20A and the insertable / removable position shown in FIG. 20B. A bevel gear 42 is supported on the rotation shaft 41 a of the transfer member contacting / separating operation member 41. The bevel gear 42 meshes with a driven bevel gear 43 disposed in the belt module internal BM, and a contact / separation gear 44 is supported on the same axis as the driven bevel gear 43.

One end 46a of a moving direction changing member 46 is connected to each of the primary transfer units T1y to T1k. The one end 46a is configured to be guided in a direction approaching and separating from the image carriers PRy to PRk by a guide (not shown) formed on the frame of the belt module BM. The moving direction converting member 46 is formed in an inverted L shape, and the other end 46b of each moving direction converting member 46 is supported by a frame body of the belt module BM so as to be movable in the left-right direction. It is connected to be rotatable. A gear portion 47 a that meshes with the contact / separation gear 44 is formed at the right end portion of the moving member 47.
The member denoted by reference numerals 41 to 47 constitutes the transfer device contacting / separating mechanism of the third embodiment.

In FIG. 20, the transfer device contact / separation operation member 41 is disposed at a position that restricts insertion / removal of the image carriers PRy to PRk in the normal position. Further, the gripping portion 41a of the transfer device contacting / separating operation member 41 is disposed at a position sandwiched between the operation member 12 of the latent image forming apparatuses LHy to LHk and the image carriers PRy to PRk in the normal position. The
In FIG. 21, in Example 3, the primary transfer device T1y is disposed on an extension line of the virtual line 27 with respect to the image carrier PRy. In Example 1, the load for pressing the primary transfer device T1y against the image carrier PRy is set to be smaller than the load for pressing the latent image forming device LHy against the image carrier PRy.

(Operation of Example 3)
In the image forming apparatus U according to the third embodiment having the above-described configuration requirements, the primary transfer units T1y to T1k are pressed against the image carriers PRy to PRk with the intermediate transfer belt B sandwiched between them by a transfer unit contact / separation mechanism. In addition, the intermediate transfer belt B is held in a state where tension is applied.
When replacing the image carriers PRy to PRk, first, the operation members 12 of the latent image forming devices LHy to LHk are operated to connect the latent image forming devices Lhy to LHk and the developing devices Gy to Gk to the image carriers PRy to PRk. Separate from PRk. Next, when the transfer member contacting / separating operation member 41 is moved to the insertable / removable position, the primary transfer devices T1y to T1k are moved to the image carriers PRy to PRk by the gears 42 to 44, the moving member 47, and the moving direction changing member 46. The intermediate transfer belt B is also separated from the image carriers PRy to PRk by decreasing the tension. In this state, the image carriers PRy to PRk can be exchanged.
When the replacement of the image carriers PRy to PRk is finished, the operation member 12 is operated after the primary transfer devices T1y to T1k are brought into contact with the image carriers PRy to PRk by the transfer member contact / separation operation member 41, The developing devices Gy to Gk and the latent image forming devices LHy to LHk are approached and abutted on the image carriers PRy to PRk in this order. That is, the latent image forming devices LHy to LHk are abutted against the image carriers PRy to PRk in a state where the primary transfer devices T1y to T1k and the developing devices Gy to Gk are in contact with and abutted against the image carriers PRy to PRk.

Next, the fourth embodiment of the present invention will be described. In the description of the fourth embodiment, the same reference numerals are given to the components corresponding to the components of the first embodiment, and the detailed description thereof will be given. 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.
FIG. 22 is an explanatory diagram of the image forming apparatus according to the fourth exemplary embodiment. FIG. 22A is an explanatory diagram illustrating a state in which the latent image forming apparatus has moved to the latent image forming apparatus contact position and the developer has moved to the developer contact position. 22B is an explanatory view of the state in which the latent image forming apparatus has moved to the latent image forming apparatus separation position and the developing unit has moved to the developer contact position, and FIG. 22C has the latent image forming apparatus moved to the latent image forming apparatus separation position; FIG. 6 is an explanatory diagram of a state where the developing device has moved to a developing device separation position.

  In FIG. 22, in the image forming apparatus U according to the fourth embodiment, the interlocking mechanism 8 + 21 according to the first embodiment is omitted, and a developer operation for rotating the developer Gy around the rotation shaft 6 is provided on the front side of the developer Gy. A member 61 is arranged. The developer operating member 61 includes an operation unit main body 61a that is operated by an operator, and an insertion / removal restricting unit 61b that is arranged to be inclined with respect to the operation unit main body 61a and restricts insertion / removal of the image carrier PRy. Have. The developing device operation member 61 of Example 4 is supported by the frame of the developing unit so as to be rotatable between a normal position shown in FIGS. 22A and 22B and a separated position shown in FIG. 22C.

In Example 4, the developing device operating member 61 is set to have substantially the same position in the front-rear direction with respect to the operating member 12, and in the state shown in FIG. 22A, the developing device operating member 61 is separated. Even if it is moved to the position side, it is configured not to move due to interference with the operation member 12. Similarly, at the separated position shown in FIG. 22C, the developer operation member 61 has entered the operation member 12 side, so that even if the operation member 12 is moved to the normal position side, it interferes with the developer operation member 61. Thus, it cannot be moved to the development position side.
As shown in FIGS. 22A and 22B, in the normal position, the insertion / removal restricting portion 61b is disposed on the front side of the image carrier PRy to regulate the insertion / extraction of the image carrier PRy, and in the separated position shown in FIG. 22C, The insertion / removal restricting portion 61b is retracted from the front side of the image carrier PRy, and insertion / removal of the image carrier PRy is permitted.
The rotating shaft 6, the developing device urging member 7, and the developing operation member 61 constitute a developing device contacting / separating mechanism of Example 4 as 6 + 7 + 61.

(Operation of Example 4)
In the image forming apparatus U of Example 4 having the above-described configuration, when the image forming operation is performed in the state shown in FIG. 22A and the image carrier PRy is replaced, first, the operation member 12 is operated, The latent image forming apparatus LHy is moved to the latent image forming apparatus separation position to obtain the state shown in FIG. 22B. That is, in the state shown in FIG. 22A, the developing device operating member 61 cannot be operated without operating the operating member 12, and in the state where the latent image forming device LHy has moved to the latent image forming device contact position, the developing device Gy cannot be moved to the developing unit separation position.
In the state shown in FIG. 22B, the image holding member PRy cannot be inserted / removed by the insertion / removal restricting portion 61b, and the developing device Gy is prevented from being inserted / removed in the state where it abuts against the image holding member PRy.

By rotating the developing device operating member 61 from the state shown in FIG. 22B, as shown in FIG. 22C, the developing device Gy is separated from the image carrier PRy, and the insertion / removal restricting portion 61b is separated from the front surface of the image carrier PRy. The image carrier PRy is retracted, and the image carrier PRy can be inserted and removed.
In the state shown in FIG. 22C, the investigation unit main body 61a of the developer operation unit sin 61 has entered the operation member 12 side, so that the operation of the operation member 12 is restricted. In other words, the latent image forming device LHy cannot be moved to the latent image forming device contact position in a state where the developing device Gy is moved to the developing device separation position.
When the replacement of the image carrier PRy is completed, the developer member operation member 61 is operated, and then the operation member 12 is operated so that the developer device Gy and the latent image forming device LHy are abutted against the image carrier PRy in this order. A decrease in the positional accuracy of the image forming apparatus LHy is suppressed.

(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. Modification examples (H01) to (H02) of the present invention are exemplified below.
(H01) In the above-described embodiment, the copying machine as the image forming apparatus has been illustrated. However, the present invention is not limited to this, and a FAX, a printer, or a multifunction machine having all or a plurality of functions may be used. Further, although the image forming apparatus having the image carriers PRy to PRk for four colors, the developing units Gy to Gk, and the latent image forming apparatuses LHy to LHk is illustrated, the present invention is not limited to this, and a single color image forming apparatus or image The present invention can also be applied to a rotary image forming apparatus in which one holding body and latent image forming apparatus are provided, and four developing devices rotate and sequentially face the image holding body.

(H02) In the third embodiment, the transfer device operation member 41 is arranged on the inner side of the operation member 12 of the latent image forming apparatuses LHy to LHk. However, it can also be arranged on the outer side. At this time, the primary transfer devices T1y to T1k are pressed against the image carriers PRy to PRk after the latent image forming devices LHy to LHk are moved to the latent image forming device contact position. Since the load that presses the container T1y against the image carrier PRy is set to be smaller than the load that presses the latent image forming device LHy against the image carrier PRy, the images on the latent image forming devices LHy to LHk are set. The displacement of the positions of the holding bodies PRy to PRk is suppressed to the minimum.

1 ... developing container,
4 ... developer holder,
6 ... rotating shaft,
6 + 7 ... first contact / separation mechanism,
7: Developing device biasing member,
8 ... contacted member for interlocking,
8 + 21 ... interlocking mechanism,
11 ... outer frame,
11-22 ... Second contact / separation mechanism,
12 ... operation member,
14 ... moving member,
17 ... Conversion member for moving direction,
21 ... Contact member for interlocking,
22 ... contact / separation member,
23b ... light irradiation part,
Gy, Gm, Gc, Gk ... developer,
LHy, LHm, LHc, LHk ... latent image forming device,
PRy, PRm, PRc, PRk ... Image carrier,
U: Image forming apparatus.

Claims (7)

An image carrier,
A latent image forming device;
A developer,
A first contact / separation mechanism for moving the developing device between a position in contact with the image carrier and a position away from the image carrier;
A position where the first contact / separation mechanism contacts the image carrier from a position away from the image carrier after moving the developing device to a position where the developer comes into contact with the image carrier. A second contact / separation mechanism to move to
An image forming apparatus comprising: An image carrier unit having an image carrier and detachable from the image forming apparatus main body;
A positioning unit of the latent image forming apparatus that is provided in the latent image forming apparatus and contacts the part of the image carrier unit to position the latent image forming apparatus;
A positioning unit of the developing unit that is provided in the developing unit and positions the developing unit by contacting a part of the image carrier unit;
The latent image forming apparatus includes a position where the positioning unit of the latent image forming apparatus is in contact with a part of the image holding unit and a position where the positioning unit of the latent image forming apparatus is in contact with the image holding unit. The second contact / separation mechanism for moving between the position separated from the image carrier in a state of being separated from a part of the image carrier unit;
The developing unit is positioned at a position where the positioning unit of the developing unit is in contact with a part of the image carrier unit, and the positioning unit of the developing unit is a part of the image carrier unit. The first contact / separation mechanism for moving between the position separated from the image holding body and the position separated from the image holding member;
The image forming apparatus according to claim 1, further comprising: A position where the latent image forming apparatus is supported by the outer frame body of the latent image forming apparatus so as to be relatively movable and the latent image forming apparatus is in contact with the image holding body; and a position where the latent image forming apparatus is separated from the image holding body. And a second contact / separation mechanism having a moving member movable between
A contact member for interlocking supported by the developing device, and a contact member for interlocking disposed corresponding to the contacted member for interlocking and supported by the second contact / separation mechanism, The interlocking mechanism having the interlocking contact member that moves in conjunction with the movement of the moving member and moves the contacted member for interlocking;
The image forming apparatus according to claim 1, further comprising: In a state where the latent image forming apparatus is moved to a position in contact with the image holding body and the developing unit is moved to a position in contact with the image holding body, the latent image forming apparatus is separated from and opposed to the contacted member for interlocking. The interlocking contact member arranged,
The image forming apparatus according to claim 3, further comprising: The latent image forming apparatus having a light irradiation unit for irradiating image writing light for forming a latent image, and an outer frame;
An operation member that is supported by the outer frame and that is movable between a position that restricts insertion / removal of the image holding body and a position that allows insertion / removal of the image holding body; The operation member that moves the latent image forming device to a position in contact with the image holding member and moves the latent image forming device to a position separated from the image holding member at a position where the latent image forming device can be inserted and removed. The contact and separation mechanism of
The image forming apparatus according to claim 1, further comprising: The operating member that is rotatably supported by the outer frame body and is supported so as to be movable between a position that restricts the insertion and extraction and a position that can be inserted and removed, and the outer frame body that is connected to the operating member and that is connected to the outer frame body A moving member supported to be movable relative to the moving member, a moving direction conversion member connected to the moving member and converting relative movement of the moving member into a rotational movement, and a moving member connected to the moving direction conversion member; A second contact / separation mechanism having a contact / separation member that supports the light irradiating unit so as to be able to approach and separate from the image carrier;
The image forming apparatus according to claim 5, further comprising: A rotating shaft member formed on the operating member;
An operation connecting member rotatably supported by the operation member and rotatably supported by the moving member, wherein the operation member is between a position where the insertion / removal is possible and a position where the insertion / removal is restricted. The operation connecting member in which a dead point is set on a path through which the rotary shaft member passes while contacting the outer surface of the operation connecting member while moving,
The image forming apparatus according to claim 6, further comprising:

Images