JP2022043351A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To press a developing roller against a photoconductor drum with a simple configuration in an image forming apparatus comprising a drum cartridge and a developing cartridge that are individually removably attached.

SOLUTION: A developing housing 52 has a first main body part 55A that projects downward from an under surface of the developing housing 52, and a first extension part 55B that extends in an orthogonal direction orthogonal to an axial direction and the vertical direction from a lower end of the first main body part 55A. The main body housing has a first portion 92A that projects upward, and a second portion 92B that extends in the orthogonal direction from an upper end of the first portion 92A, the second portion 92B being engaged with the first extension part 55B from above. In a state in which the second portion 92B is engaged with the first extension part 55B, a developing cartridge 50 is moved and thereby a developing roller is brought into contact with a photoreceptor drum.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present disclosure relates to an image forming apparatus including a removable drum cartridge and a developing cartridge.

Conventionally, there is known an image forming apparatus in which a drum cartridge and a developing cartridge can be attached to and detached from the main body housing in the axial direction of the photoconductor drum (see Patent Document 1). In this technology, the drum cartridge and the developing cartridge can be individually attached to and detached from the main body housing. In this image forming apparatus, after the drum cartridge and the developing cartridge are mounted, the developing roller is pressed against the photoconductor drum.

Japanese Unexamined Patent Publication No. 2017-173805

By the way, in an image forming apparatus including an individually removable drum cartridge and a developing cartridge, a configuration in which a developing roller can be pressed against a photoconductor drum with a simple configuration is desired.

In order to solve the above-mentioned problems, the image forming apparatus of the present invention includes a drum cartridge, a developing cartridge, a main body housing, a cover, a first internal surface, and a second internal surface. The drum cartridge has a photoconductor drum that is rotatable about a first axis extending in the axial direction. The developing cartridge has a developing roller that is rotatable about a second axis extending in the axial direction and a developing housing that can accommodate toner. The main body housing is a main body housing having a slot extending in the axial direction, and the slot allows the drum cartridge to be attached / detached in the axial direction and the developing cartridge to be attached / detached in the axial direction. do. The cover has a closed state in which the slot is closed and an open state in which the slot is opened. The first inner surface is located inside the slot. The second inner surface is located inside the slot and is axially more distant from the cover than the first inner surface. The developing housing is further equipped with a first contact surface that comes into contact with the first inner surface when the developing cartridge is mounted in the slot and the drum cartridge is mounted in the slot in a state where the drum cartridge is mounted in the slot. In the state, it includes a second contact surface that comes into contact with the second inner surface when the developing cartridge is mounted in the slot. The first contact position between the first inner surface and the first contact surface is farther from the developing roller than the second contact position between the second inner surface and the second contact surface. The image forming apparatus further includes a pressing member that presses the developing roller against the photoconductor drum in a state where the first inner surface is in contact with the first contact surface and the second inner surface is in contact with the second contact surface. ..

According to this configuration, in an image forming apparatus including an individually removable drum cartridge and a developing cartridge, the developing roller can be pressed against the photoconductor drum with a simple configuration.

In the above configuration, the image forming apparatus is an intermediate transfer belt located above the drum cartridge and the developing cartridge in a state where the drum cartridge and the developing cartridge are mounted on the main body housing, and the drum cartridge and the developing cartridge are further formed. May be configured to include an intermediate transfer belt with which the surface of the photoconductor drum comes into contact with the body while it is mounted on the main body housing.

In the above-described configuration, the image forming apparatus may be further configured to be located above the intermediate transfer belt and include a discharge portion from which the recording sheet is discharged.

In the above-described configuration, the first inner surface may be located farther from the photoconductor drum than the second inner surface when the drum cartridge is mounted on the main body housing.

In the above-described configuration, the first contact surface may be located farther from the developing roller than the second contact surface.

In the above configuration, the second contact surface may not come into contact with the first inner surface when the developing cartridge is mounted in the slot while the drum cartridge is mounted in the main body housing.

According to this, it is easy to install the developing cartridge in the slot.

In the above-described configuration, the first inner surface may be located at the tip of the first protruding portion protruding from the slot, and the second inner surface may be located at the tip of the second protruding portion protruding from the slot.

In the above configuration, the pressing member includes a first pressing member and a second pressing member, the first contact surface is located at the tip of the first pressing member, and the second contact surface is the second pressing member. It may be configured to be located at the tip of.

In the above configuration, the pressing member includes a first pressing member and a second pressing member, the first inner surface is located at the tip of the first pressing member, and the second inner surface is the second pressing member. It may be configured to be located at the tip of.

In the above-described configuration, the first contact surface is located at the tip of the first protrusion protruding from the developing housing, and the second contact surface is located at the tip of the second protruding portion protruding from the developing housing. May be good.

In the above-described configuration, the main body housing has a first inclined surface located on one side in the axial direction of the first internal surface, and the drum cartridge and the developing cartridge are mounted on the main body housing on the first inclined surface. In the state, it may be configured to extend away from the developing roller as it approaches the cover from the first inner surface.

According to this, since the first inclined surface guides the first contact surface to the first inner surface, it is possible to easily mount the developing cartridge.

In the above-described configuration, the main body housing has a second inclined surface located on one side in the axial direction of the second internal surface, and the drum cartridge and the developing cartridge are mounted on the main body housing on the second inclined surface. In the state, it may be configured to extend away from the developing roller as it approaches the cover from the second contact surface.

According to this, since the second inclined surface guides the second contact surface to the second inner surface, it is possible to easily mount the developing cartridge.

In the above configuration, the slot has a guide portion for guiding the development cartridge when the development cartridge is installed, and the guide portion regulates the development roller from contacting the photoconductor drum when the development cartridge is attached or detached. However, when the developing cartridge is installed in the slot, the developing roller may be configured to allow contact with the photoconductor drum.

According to the present disclosure, it is possible to suppress interference between the developing cartridge and the drum cartridge when the developing cartridge is mounted in the axial direction while the drum cartridge is mounted in the main body housing of the image forming apparatus. ..

It is a figure which shows the schematic structure of the image forming apparatus which concerns on 1st Embodiment of this disclosure. It is a figure when the drum cartridge and the development cartridge are installed in the slot. It is a perspective view which looked at the slot, the drum cartridge and the developing cartridge from the top. It is a figure explaining the mechanism for pressing a developing roller against a photoconductor drum. It is a perspective view which looked at the slot, the drum cartridge and the developing cartridge from the bottom. It is a figure (a)-(d) explaining the operation when the development cartridge is installed in a slot. It is a perspective view of the slot, the drum cartridge and the development cartridge which concerns on 2nd Embodiment. It is a perspective view of the slot, the drum cartridge and the development cartridge which concerns on 3rd Embodiment. It is a perspective view of the slot, the drum cartridge and the development cartridge which concerns on 4th Embodiment. It is a figure which shows the 1st inclined surface and 2nd inclined surface which concerns on 1st modification. The slot, the drum cartridge, and the developing cartridge according to the second modification (a) and the third modification (b). The slot, the drum cartridge, and the developing cartridge according to the fourth modification (c) and the fifth modification (d).

Next, the first embodiment of the present disclosure will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the image forming apparatus 1 is a color printer. The image forming apparatus 1 includes a main body housing 2, a supply unit 3, an image forming unit 4, and a discharge roller 9. The supply unit 3 supplies the recording sheet S to the image forming unit 4. The image forming unit 4 forms an image on the recording sheet S. The discharge roller 9 discharges the recording sheet S.

The main body housing 2 has a discharge portion 2E at the upper portion. The recording sheet S is discharged to the discharge unit 2E. The discharge unit 2E is located above the intermediate transfer belt 63, which will be described later.

The supply unit 3 is located at the lower part in the main body housing 2. The supply unit 3 includes a supply tray 31 and a supply mechanism 32. The supply tray 31 is removable from the main body housing 2. The supply mechanism 32 conveys the recording sheet S from the supply tray 31 to the image forming unit 4.

The image forming unit 4 includes a drum cartridge 40, a developing cartridge 50, an exposure apparatus SU, a transfer unit 60, and a fixing unit 70. A plurality of drum cartridges 40 and developing cartridges 50 are arranged according to the number of toner colors. In this embodiment, four drum cartridges 40 and four developing cartridges 50 are arranged side by side.

Each drum cartridge 40 has a photoconductor drum 41, a frame 42, and a charger (not shown). The photoconductor drum 41 is rotatable about the first axis X1 extending in the axial direction. The four photoconductor drums 41 are arranged in orthogonal directions (simply referred to as "orthogonal directions" in the following description) that are orthogonal to each other in the axial direction and the vertical direction. The frame 42 rotatably supports the photoconductor drum 41. Each drum cartridge 40 is independently detachable from the main body housing 2 in the axial direction.

With the drum cartridge 40 and the developing cartridge 50 mounted on the main body housing 2, the drum cartridge 40 is aligned with the developing cartridge 50 in the orthogonal direction. In this embodiment, the drum cartridge 40 is located on one side (right side in FIG. 1) in the orthogonal direction of the developing cartridge 50. The developing cartridge 50 is located on the other side (left side in FIG. 1) in the orthogonal direction of the drum cartridge 40.

Each developing cartridge 50 contains toners of different colors. Each developing cartridge 50 has a developing roller 51 and a developing housing 52. The developing roller 51 is rotatable about the second axis X2 extending in the axial direction. The developing housing 52 can accommodate toner. The four developing rollers 51 are arranged in the orthogonal direction. The developing cartridges 50 can be independently attached to and detached from the main body housing 2 in the axial direction.

The exposure apparatus SU is located below each drum cartridge 40. The exposure apparatus SU emits a laser beam (not shown) to each photoconductor drum 41.

The transfer unit 60 is located between the four photoconductor drums 41 and the discharge unit 2E. The transfer unit 60 includes a drive roller 61, a driven roller 62, an intermediate transfer belt 63, four primary transfer rollers 64, and a secondary transfer roller 65.

The intermediate transfer belt 63 is an endless belt. The intermediate transfer belt 63 is located above the drum cartridge 40 and the developing cartridge 50 in a state where the drum cartridge 40 and the developing cartridge 50 are mounted on the main body housing 2. The surface of the photoconductor drum 41 comes into contact with the intermediate transfer belt 63 in a state where the drum cartridge 40 and the developing cartridge 50 are mounted on the main body housing 2. The intermediate transfer belt 63 is stretched between the drive roller 61 and the driven roller 62.

The primary transfer roller 64 is located inside the intermediate transfer belt 63. The primary transfer roller 64 sandwiches the intermediate transfer belt 63 with the photoconductor drum 41.

The secondary transfer roller 65 is located outside the intermediate transfer belt 63. The secondary transfer roller 65 sandwiches the intermediate transfer belt 63 with the drive roller 61.

The fixing unit 70 is located above the intermediate transfer belt 63. The fixing unit 70 includes a heating roller 71 and a pressure roller 72. The pressure roller 72 is pressed against the heating roller 71.

In the image forming unit 4, first, the surface of the photoconductor drum 41 is charged by a charger. After that, the exposure apparatus SU exposes the surface of the photoconductor drum 41. As a result, an electrostatic latent image is formed on the photoconductor drum 41.

Next, the developing roller 51 supplies toner to the electrostatic latent image on the photoconductor drum 41. As a result, a toner image is formed on the photoconductor drum 41. Then, the toner image on the photoconductor drum 41 is transferred onto the intermediate transfer belt 63.

When the recording sheet S passes between the intermediate transfer belt 63 and the secondary transfer roller 65, the toner image on the intermediate transfer belt 63 is transferred onto the recording sheet S. After that, the toner image on the recording sheet S is fixed by the fixing unit 70. Next, the recording sheet S is discharged to the discharge unit 2E by the discharge roller 9.

As shown in FIG. 2, the main body housing 2 has a cover 2A and a slot 20.

The cover 2A is provided at one end of the main body housing 2 in the axial direction. The cover 2A can be opened and closed. The cover 2A has a closed state in which the slot 20 is closed and an open state in which the slot 20 is opened.

The slot 20 is provided corresponding to each drum cartridge 40 and each developing cartridge 50. Each slot 20 extends axially. Each slot 20 is open on one side in the axial direction. Each slot 20 allows the drum cartridge 40 to be attached / detached in the axial direction, and allows the developing cartridge 50 to be attached / detached in the axial direction. One drum cartridge 40 and one developing cartridge 50 can be mounted in each slot 20.

As shown in FIG. 3, each slot 20 has a first wall 20A, a second wall 20B, and a third wall 20C. The first wall 20A extends axially and vertically. The second wall 20B faces the first wall 20A and is located at a predetermined distance in the orthogonal direction from the first wall 20A. The second wall 20B extends axially and vertically. The third wall 20C connects one end of the first wall 20A and one end of the second wall 20B.

The second wall 20B has a first protruding portion 21 and a second protruding portion 22. The first protrusion 21 and the second protrusion 22 are located inside the slot 20. The first protruding portion 21 protrudes from the second wall 20B. The second protruding portion 22 protrudes from the second wall 20B. The first protrusion 21 is located at one end in the axial direction. The second protrusion 22 is located at the other end in the axial direction. That is, the second protruding portion 22 is located farther from the cover 2A in the axial direction than the first protruding portion 21 (see FIG. 2).

As shown in FIG. 4, the first protruding portion 21 has a first inner surface 21A and a first inclined surface 21B. The first inner surface 21A and the first inclined surface 21B are located inside the slot 20.
The first inner surface 21A projects from the inner surface of the slot 20. The first inner surface 21A is located at the tip of the first protrusion 21. The first inclined surface 21B is located on one side in the axial direction of the first inner surface 21A. The first inclined surface 21B extends away from the developing roller 51 as it approaches the cover 2A from the first inner surface 21A in a state where the drum cartridge 40 and the developing cartridge 50 are mounted on the main body housing 2.

The second protruding portion 22 has a second inner surface 22A and a second inclined surface 22B. The second inner surface 22A and the second inclined surface 22B are located inside the slot 20. The second inner surface 22A projects from the inner surface of the slot 20. The second inner surface 22A is located at the tip of the second protrusion 22. The second inner surface 22A is located away from the cover 2A in the axial direction than the first inner surface 21A (see FIG. 2). The second inclined surface 22B is located on one side in the axial direction of the second inner surface 22A. The second inclined surface 22B extends away from the developing roller 51 as it approaches the cover 2A from the second inner surface 22A in a state where the drum cartridge 40 and the developing cartridge 50 are mounted on the main body housing 2.

In the present embodiment, the first inclined surface 21B and the second inclined surface 22B have the same inclination angle.

As shown in FIG. 4, when the drum cartridge 40 is mounted on the main body housing 2, the distance L3 from the first inner surface 21A to the photoconductor drum 41 is from the second inner surface 22A to the photoconductor drum 41. Greater than the distance L4. That is, when the drum cartridge 40 is mounted on the main body housing 2, the first inner surface 21A is located farther from the photoconductor drum 41 than the second inner surface 22A.

As shown in FIG. 5, the third wall 20C has a first guide portion 80, a second guide portion 90, and a slit SL.

The first guide portion 80 has a first rail 81 and a second rail 82. The first rail 81 and the second rail 82 are located inside the slot 20. The first rail 81 and the second rail 82 project from the third wall 20C. The first rail 81 and the second rail 82 extend from the end on one end side in the axial direction of the slot 20 to the end on the other end side. When the drum cartridge 40 is attached / detached, the first rail 81 and the second rail 82 guide the drum cartridge 40 in the axial direction and restrict the drum cartridge 40 from moving in the orthogonal direction. Further, the first rail 81 and the second rail 82 are restricted so that the drum cartridge 40 does not move in the orthogonal direction with the drum cartridge 40 attached.

The second guide unit 90 is an example of a guide unit that guides the development cartridge when the development cartridge is attached. The second guide unit 90 regulates the developing roller 51 from coming into contact with the photoconductor drum 41 when the developing cartridge 50 is attached / detached, and when the developing cartridge 50 is mounted in the slot 20, the developing roller 51 and the photoconductor drum 41 are restricted. Allows 41 contacts.

The second guide portion 90 has a third rail 91 and a fourth rail 92. The third rail 91 and the fourth rail 92 are located inside the slot 20. The third rail 91 and the fourth rail 92 project from the third wall 20C. The third rail 91 and the fourth rail 92 extend from the end on one end side in the axial direction of the slot 20 to the end on the other end side. The first rail 81, the second rail 82, the third rail 91, and the fourth rail 92 are arranged in parallel in this order from one end side in the orthogonal direction.

The third rail 91 includes a first rail portion 91X, a second rail portion 91Y, and a third rail portion 91Z. In the axial direction, the first opening 91A is located between the first rail portion 91X and the second rail portion 91Y. Further, in the axial direction, the second opening 91B is located between the second rail portion 91Y and the third rail portion 91Z.
The first opening 91A is located at one end of the slot 20 in the axial direction. The second opening 91B is located at the other end of the slot 20 in the axial direction. The axial dimension K1 of the first opening 91A is smaller than the axial dimension K2 of the second opening 91B (see FIG. 3).

The fourth rail 92 protrudes from the third wall 20C. Specifically, the fourth rail 92 has a first portion 92A and a second portion 92B. The first portion 92A is a portion protruding upward from the third wall 20C. The second portion 92B extends from the upper end of the first portion 92A toward one side in the orthogonal direction.

When the development cartridge 50 is attached / detached, the third rail 91 and the fourth rail 92 guide the development cartridge 50 in the axial direction and restrict the development cartridge 50 from moving in the orthogonal direction. Further, when the developing cartridge 50 is attached / detached, the fourth rail 92 engages with the first engaging portion 55 and the second engaging portion 56, which will be described later, to restrict the developing cartridge 50 from moving in the vertical direction. ..

The slit SL extends in the axial direction. The laser beam emitted from the exposure apparatus SU can pass through the slit SL.

As shown in FIG. 5, the developing cartridge 50 has a first pressing member 53, a second pressing member 54, a first engaging portion 55, a second engaging portion 56, and a shaft support portion 57. ing.

As shown in FIG. 4, the developing housing 52 has a first hole 52A and a second hole 52B. The first hole 52A and the second hole 52B are open on the other side in the orthogonal direction. The first hole 52A is located at one end of the developing housing 52 in the axial direction. The second hole 52B is located at the other end of the developing housing 52 in the axial direction. A flange 52C is provided on the edge of the first hole 52A to prevent the first pressing member 53 from coming off. A flange 52D is provided on the edge of the second hole 52B to prevent the second pressing member 54 from coming off.

The first pressing member 53 engages with the first hole 52A and is slidably held in the orthogonal direction. The first pressing member 53 is prevented from coming out of the first hole 52A by contacting the flange 53A provided at the base end with the flange 52C of the first hole 52A. The first contact surface 53B located at the tip of the first pressing member 53 protrudes from the developing housing 52. The first contact surface 53B is round when viewed from above. A spring 53S is provided between the base end surface of the first pressing member 53 and the bottom of the first hole 52A. The spring 53S always urges the first pressing member 53 toward the other side in the orthogonal direction.

When the developing cartridge 50 is mounted in the slot 20, the tip of the first pressing member 53 comes into contact with the first inner surface 21A of the slot 20 at the first contact surface 53B. The first contact surface 53B is a surface that comes into contact with the first inner surface 21A when the developing cartridge 50 is installed in the slot 20 in a state where the drum cartridge 40 is installed in the slot 20.

The second pressing member 54 is engaged with the second hole 52B and is slidably held in the orthogonal direction. The second pressing member 54 is prevented from coming out of the second hole 52B by contacting the flange 54A provided at the base end with the flange 52D of the second hole 52B. The second contact surface 54B located at the tip of the second pressing member 54 projects from the developing housing 52. The second contact surface 54B is round when viewed from above. A spring 54S is provided between the base end surface of the second pressing member 54 and the bottom of the second hole 52B. The spring 54S always urges the second pressing member 54 toward the other side in the orthogonal direction.

When the developing cartridge 50 is mounted in the slot 20, the tip of the second pressing member 54 comes into contact with the second inner surface 22A of the slot 20 at the second contact surface 54B. The second contact surface 54B is a surface that comes into contact with the second inner surface 22A when the developing cartridge 50 is installed in the slot 20 in a state where the drum cartridge 40 is installed in the slot 20.

When the developing cartridge 50 is not mounted in the slot 20, the distance L1 from the first contact surface 53B to the developing roller 51 is larger than the distance L2 from the second contact surface 54B to the developing roller 51. That is, in a state where the developing cartridge 50 is not mounted in the slot 20, the first contact surface 53B is located farther from the developing roller 51 than the second contact surface.

The distance L3 from the first inner surface 21A to the developing roller 51 is larger than the distance L4 from the second inner surface 22A to the developing roller 51.

With the drum cartridge 40 and the developing cartridge 50 mounted in the slot 20, the distance L3 from the first contact surface 53B to the developing roller 51 is larger than the distance L4 from the second contact surface 54B to the developing roller 51. That is, in a state where the drum cartridge 40 and the developing cartridge 50 are mounted in the slot 20, the first contact surface 53B is located farther from the developing roller 51 than the second contact surface 54B.

With the drum cartridge 40 and the developing cartridge 50 mounted in the slot 20, the distance L3 from the first contact position between the first inner surface 21A and the first contact surface 53B to the developing roller 51 is the second inner surface 22A. The distance from the second contact position with the second contact surface 54B to the developing roller 51 is larger than L4. That is, the first contact position between the first inner surface 21A and the first contact surface 53B is farther from the developing roller 51 than the second contact position between the second inner surface 22A and the second contact surface 54B.

When the developing cartridge 50 is mounted in the slot 20 in a state where the drum cartridge 40 is mounted in the main body housing 2, the developing roller 51 is inserted from the tip of the second pressing member 54 (indicated by a two-dot chain line in FIG. 4). The distance L2 to is smaller than the distance L3 from the first inner surface 21A to the developing roller 51. Therefore, when the developing cartridge 50 is mounted in the slot 20 in a state where the drum cartridge 40 is mounted in the main body housing 2, the second contact surface 54B does not come into contact with the first inner surface 21A (). See FIG. 6 (a)).

The first pressing member 53 and the second pressing member 54 are examples of pressing members. In the present embodiment, the pressing member includes a first pressing member 53 and a second pressing member 54. In the first pressing member 53 and the second pressing member 54, the developing roller 51 is in a state where the first inner surface 21A is in contact with the first contact surface 53B and the second inner surface 22A is in contact with the second contact surface 54B. Is pressed against the photoconductor drum 41.

As shown in FIG. 5, the first engaging portion 55 is located on the lower surface of the developing housing 52. The first engaging portion 55 has a first main body portion 55A and a first extending portion 55B. The first main body portion 55A projects downward from the lower surface of the developing housing 52. The first extending portion 55B extends from the lower end of the first main body portion 55A to the other end side in the orthogonal direction.

The first main body portion 55A has a first surface 55C and a second surface 55D. The first surface 55C extends along the axial direction. The first surface 55C is a surface that comes into contact with the third rail 91 in the process of attaching and detaching the developing cartridge 50. The second surface 55D is inclined and extends from the first surface 55C. Specifically, the second surface 55D extends so as to be inclined with respect to the axial direction from the end of the first surface 55C toward the other side in the orthogonal direction toward one side in the axial direction. The second surface 55D is a surface that comes into contact with the first rail portion 91X of the third rail 91 when the developing cartridge 50 is pulled out from the slot 20.

The first main body portion 55A is a portion restricted by the third rail 91 so as not to move to one side in the orthogonal direction. The first extending portion 55B is restricted from moving to the other side in the orthogonal direction by the first portion 92A of the fourth rail 92, and is restricted from moving upward by the second portion 92B of the fourth rail 92. It is the part to be done.

The axial dimension K3 of the first engaging portion 55 is smaller than the axial dimension K4 of the second engaging portion 56. The axial dimension K3 of the first engaging portion 55 is smaller than the axial dimension K1 of the first opening 91A. The axial dimension K3 of the first engaging portion 55 is smaller than the axial dimension K2 of the second opening 91B.

The second engaging portion 56 is located on the lower surface of the developing housing 52. The second engaging portion 56 has a second main body portion 56A and a second extending portion 56B. The second main body portion 56A projects downward from the lower surface of the developing housing 52. The second extending portion 56B extends from the lower end of the second main body portion 56A to the other end side in the orthogonal direction.

The second main body portion 56A has a third surface 56C and a fourth surface 56D. The third surface 56C extends along the axial direction. The third surface 56C is a surface that comes into contact with the third rail 91 in the process of attaching and detaching the developing cartridge 50.
The fourth surface 56D is inclined and extends from the third surface 56C. Specifically, the fourth surface 56D extends inclined with respect to the axial direction from the end of the third surface 56C toward the other side in the orthogonal direction toward one side in the axial direction. The fourth surface 56D is a surface that comes into contact with the second rail portion 91Y of the third rail 91 when the developing cartridge 50 is pulled out from the slot 20.

The second main body portion 56A is a portion restricted by the third rail 91 so as not to move to one side in the orthogonal direction. The second extending portion 56B is restricted from moving to the other side in the orthogonal direction by the first portion 92A of the fourth rail 92, and is restricted from moving upward by the second portion 92B of the fourth rail 92. It is the part to be done.

The axial dimension K4 of the second engaging portion 56 is larger than the axial dimension K1 of the first opening 91A. The axial dimension K4 of the second engaging portion 56 is smaller than the axial dimension K2 of the second opening 91B.

The shaft support portion 57 extends from the end face on one side in the axial direction of the developing housing 52 to one side in the orthogonal direction. The shaft support portion 57 has an elongated hole 57A. The elongated hole 57A is adapted to engage with a boss 43 provided on one end surface of the drum cartridge 40 in the axial direction.

Next, the operation when the drum cartridge 40 and the developing cartridge 50 are mounted will be described.
As shown in FIG. 6A, first, the drum cartridge 40 is mounted in the slot 20. Then, the second engaging portion 56 of the developing cartridge 50 is engaged with the third rail 91 and the fourth rail 92. At this time, the developing roller 51 is not in contact with the photoconductor drum 41. Further, the second contact surface 54B of the developing cartridge 50 does not come into contact with the first inner surface 21A of the slot 20. At this time, since the axial dimension K4 of the second engaging portion 56 is larger than the axial dimension K1 of the first opening 91A, the second engaging portion 56 passes through the first opening 91A without entering the first opening 91A.

When the developing cartridge 50 is pushed to the back side of the slot 20 from the state of FIG. 6A, the first pressing member 53 is attached to the first inclined surface 21B of the first protruding portion 21 as shown in FIG. 6B. At the same time, the second pressing member 54 comes into contact with the second inclined surface 22B of the second protruding portion 22.

When the developing cartridge 50 is pushed to the back side of the slot 20 from the state of FIG. 6B, the first pressing member 53 is pushed by the first inclined surface 21B and the developing roller 51 side as shown in FIG. 6C. The second pressing member 54 is pushed by the second inclined surface 22B and slides toward the developing roller 51. At this time, the first engaging portion 55 and the second engaging portion 56 are in contact with the third rail 91. Therefore, the developing cartridge 50 cannot move to one side in the orthogonal direction. As a result, the developing roller 51 is not in contact with the photoconductor drum 41.

When the developing cartridge 50 is pushed to the back side of the slot 20 from the state of FIG. 6 (c), the first pressing member 53 comes into contact with the first inner surface 21A as shown in FIG. 6 (d). Similarly, the second pressing member 54 comes into contact with the second inner surface 22A. In this way, the first contact surface 53B of the first pressing member 53 comes into contact with the first inner surface 21A. Further, the second contact surface 54B of the second pressing member 54 comes into contact with the second inner surface 22A. At this time, a part of the first engaging portion 55 enters the first opening 91A, and a part of the second engaging portion 56 enters the second opening 91B.

Next, the operation when the developing cartridge 50 is removed will be described.
When the developing cartridge 50 is removed from the slot 20, the developing cartridge 50 is pulled out to one side in the axial direction from the state shown in FIG. 6D. Then, the second surface 55D of the first engaging portion 55 comes into contact with the first rail portion 91X of the third rail 91, and the fourth surface 56D of the second engaging portion 56 becomes the second surface of the third rail 91. It comes into contact with the rail portion 91Y.

When the developing cartridge 50 is further pulled out from this state, as shown in FIG. 6 (c), the first engaging portion 55 is located on the other side in the orthogonal direction because the second surface 55D is pushed by the first rail portion 91X. Moving. Then, the first surface 55C of the first engaging portion 55 comes into contact with the third rail 91. Similarly, the second engaging portion 56 moves to the other side in the orthogonal direction because the fourth surface 56D is pushed by the second rail portion 91Y. Then, the third surface 56C of the second engaging portion 56 comes into contact with the third rail 91. Therefore, when the developing cartridge 50 is pulled out to one side in the axial direction, the developing cartridge 50 is pushed to the other side in the orthogonal direction, so that the contact between the developing roller 51 and the photoconductor drum 41 is released.

After that, the developing cartridge 50 is guided by the third rail 91 to be restricted from moving to one side in the orthogonal direction, and the developing roller 51 is pulled out in the axial direction without coming into contact with the photoconductor drum 41.

According to the image forming apparatus 1 described above, if the developing cartridge 50 is inserted into the slot 20 with the drum cartridge 40 inserted in the slot 20, the developing roller 51 presses the photoconductor drum 41. can. Further, when the developing cartridge 50 is mounted in the axial direction with respect to the main body housing 2 in a state where the drum cartridge 40 is mounted in the main body housing 2 of the image forming apparatus 1, the developing cartridge and the drum cartridge Interference can be suppressed.

Further, when the developing cartridge 50 is mounted in the slot 20 in a state where the drum cartridge 40 is mounted in the main body housing 2, the second contact surface 54B does not come into contact with the first inner surface 21A. Therefore, it is easy to mount the developing cartridge 50 in the slot 20.

Further, when the developing cartridge 50 is mounted in the slot 20, the first inclined surface 21B guides the first contact surface 53B to the first inner surface 21A, and the second inclined surface 22B guides the second contact surface 54B to the second inner surface. Guide to 22A. Therefore, it is easy to mount the developing cartridge 50.

Further, the second guide portion 90 regulates that the developing roller 51 does not come into contact with the photoconductor drum 41 when the developing cartridge 50 is attached / detached. Therefore, when the developing cartridge 50 is mounted in the axial direction with respect to the main body housing 2 while the drum cartridge 40 is mounted in the main body housing 2 of the image forming apparatus 1, the developing cartridge and the drum cartridge are mounted. Interference with can be suppressed.

Next, a second embodiment of the present disclosure will be described. In the following description, members having substantially the same structure as that of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the first embodiment, the first inner surface and the second inner surface are located at the protruding portion of the slot, and the first contact surface and the second contact surface are located at the tip of the pressing member. However, the first inner surface and the second inner surface may be located at the tip of the pressing member, and the first contact surface and the second contact surface may be located at the protruding portion of the developing housing.

For example, in the second embodiment shown in FIG. 7, the first inner surface 121A is located at the tip of the first pressing member 121. A spring 121S is provided between the base end surface of the first pressing member 121 and the slot 120. The spring 121S always urges the first pressing member 121 toward one side in the orthogonal direction. The second inner surface 122A is located at the tip of the second pressing member 122. A spring 122S is provided between the base end surface of the second pressing member 122 and the slot 120. The spring 122S always urges the second pressing member 122 toward one side in the orthogonal direction.

The first contact surface 153B is located at the tip of the first protruding portion 153 protruding from the developing housing 152. The second contact surface 154B is located at the tip of the second protruding portion 154 protruding from the developing housing 152.

When the developing cartridge 150 is mounted in the slot 120 from the state shown in FIG. 7, the first internal surface 121A comes into contact with the first contact surface 153B. Similarly, the second inner surface 122A comes into contact with the second contact surface 154B.

The distance M1 from the first inner surface 121A to the photoconductor drum 41 is the same as the distance M3 from the first contact surface 153B to the photoconductor drum 41 when the developing cartridge 150 is mounted on the main body housing 2. Similarly, the distance M2 from the second inner surface 122A to the photoconductor drum 41 is the same as the distance M4 from the second contact surface 154B to the photoconductor drum 41 when the developing cartridge 150 is mounted on the main body housing 2. It becomes.

When the drum cartridge 40 and the developing cartridge 150 are mounted on the main body housing 2, the distance M3 from the first inner surface 121A to the photoconductor drum 41 is from the distance M4 from the second inner surface 122A to the photoconductor drum 41. Is also big. That is, in a state where the drum cartridge 40 and the developing cartridge 150 are mounted on the main body housing 2, the first inner surface 121A is located farther from the photoconductor drum 41 than the second inner surface 122A.

Further, when the developing cartridge 150 is mounted in the slot 120 in a state where the drum cartridge 40 is mounted in the main body housing 2, the second contact surface 154B does not come into contact with the first inner surface 121A.

Also in the second embodiment described above, if the developing cartridge 150 is inserted into the slot 120 with the drum cartridge 40 inserted in the slot 120, the developing roller 51 can press the photoconductor drum 41. Further, when the developing cartridge 150 is mounted in the axial direction with respect to the main body housing 2 in a state where the drum cartridge 40 is mounted in the main body housing 2 of the image forming apparatus 1, the developing cartridge and the drum cartridge Interference can be suppressed.

Next, a third embodiment of the present disclosure will be described. In the following description, members having substantially the same structure as that of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the first embodiment, the first inner surface and the second inner surface are provided in a part of the main body housing, but the first inner surface and the second inner surface may be provided in another member.

For example, as shown in FIG. 8, the slot 220 in the third embodiment can be inserted with four drum cartridges 240 and four developing cartridges 50. In this third embodiment, the first protrusion 221 having the first inner surface 221A is provided on the frame 242 of the adjacent drum cartridge 140. Similarly, a second protruding portion 222 having a second inner surface 222A is provided on the frame 242 of the adjacent drum cartridge 240.

Also in this third embodiment, if the developing cartridge 50 is inserted into the slot 220 as in the first embodiment, the developing roller 51 can be pressed against the photoconductor drum 41. Further, when the developing cartridge 50 is mounted in the axial direction with respect to the main body housing 2 in a state where the drum cartridge 40 is mounted in the main body housing 2 of the image forming apparatus 1, the developing cartridge and the drum cartridge Interference can be suppressed. Further, in the third embodiment, since there is no wall between each drum cartridge 240 and each developing cartridge 50, it can be made compact in the orthogonal direction.

Next, a fourth embodiment of the present disclosure will be described. In the following description, members having substantially the same structure as that of the second embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 9, in the fourth embodiment, the first pressing member 121 having the first inner surface 121A and the second pressing member 122 having the second inner surface 122A are provided on the frame 342 of the adjacent drum cartridge 340. Has been done.

Also in this fourth embodiment, if the developing cartridge 150 is inserted into the slot 320 as in the second embodiment, the developing roller 51 can press the photoconductor drum 41. Further, when the developing cartridge 150 is mounted in the axial direction with respect to the main body housing 2 in a state where the drum cartridge 340 is mounted in the main body housing 2 of the image forming apparatus 1, the developing cartridge and the drum cartridge Interference can be suppressed. Further, in the fourth embodiment, since there is no wall between each drum cartridge 340 and each developing cartridge 150, it can be made compact in the orthogonal direction.

In each of the above-described embodiments, the inclination of the first inclined surface of the first inner surface and the inclination of the second inclined surface of the second inner surface are the same inclination angle, but different inclination angles may be used.

For example, in the first modification shown in FIG. 10, the inclinations of the first inclined surface 421B of the first protruding portion 421 and the second inclined surface 422B of the second protruding portion 422 are different. Specifically, the inclination angle θ1 with respect to the axial direction of the first inclined surface 421B is smaller than the inclination angle θ2 with respect to the axial direction of the second inclined surface 422B.

By making the inclination angle θ1 of the first inclined surface 421B different from the inclination angle θ2 of the second inclined surface 422B as in the first modification, the pressing force of the first pressing member 453 and the second pressing member 454 is increased. You can adjust the trend.

Further, in the first embodiment described above, a plurality of protrusions protruding from the inner surface of the slot 20 are provided, but the number of protrusions may be one. For example, in the second modification shown in FIG. 11A, the first inner surface 521A and the second inner surface 522A are connected by the third inclined surface 523A, and the protrusion is one. The same effect as that of the first embodiment can be obtained in this form as well.

Further, in the above-mentioned second embodiment, a plurality of protruding portions are provided so as to protrude from the developing housing, but only one protruding portion may be provided. For example, in the third modification shown in FIG. 11B, the first inner surface 621A and the second inner surface 622A are connected by the third inclined surface 623A, and one protruding portion protrudes from the developing housing 652. Is. The same effect as that of the second embodiment can be obtained in this embodiment as well.

Further, in the above-described first embodiment, the first pressing member and the second pressing member are urged by the spring, but the spring itself may be the pressing member.

For example, in the fourth modification shown in FIG. 12A, the developing cartridge 750 has a first leaf spring 753 and a second leaf spring 754 in the developing housing 752. The first leaf spring 753 and the second leaf spring 754 are fixed to the developing housing 752. The first contact surface 753B is located at the tip of the first leaf spring 753. The second contact surface 754B is located at the tip of the second leaf spring 754.

Also in this fourth modification, the developing roller 51 can press the photoconductor drum 41 by inserting the developing cartridge 750 into the slot 20, as in each of the above-described embodiments. The spring is not limited to a leaf spring, and may be a torsion spring or the like. According to this fourth modification, the number of parts can be reduced.

Further, in the above-mentioned second embodiment, the first inner surface 121A is provided at the tip of the first pressing member 121, but the first inner surface may be provided at the tip of the urging member. Similarly, the second inner surface 122A is provided at the tip of the second pressing member 122, but the second inner surface may be provided at the tip of the urging member.

For example, in the fifth modification shown in FIG. 12B, the first leaf spring 821 and the second leaf spring 822 are provided on the inner surface of the slot 820. The first inner surface 821A is located at the tip of the first leaf spring 821. The first inner surface 822A is located at the tip of the second leaf spring 822.

Also in this fifth modification, as in the second embodiment, if the developing cartridge 150 is inserted into the slot 820, the developing roller 51 can press the photoconductor drum 41. The spring is not limited to a leaf spring, and may be a torsion spring or the like. According to this fifth modification, the number of parts can be reduced.

In each of the above-described embodiments, the image forming apparatus 1 is a color printer, but the present invention is not limited to this, and the present invention is applied to other image forming apparatus, for example, a monochrome printer, a copying machine, a multifunction device, and the like. You may.

Each element described in the above-described embodiment and modification may be arbitrarily combined and carried out.

1 Image forming device 2 Main body housing 2A Cover 2E Discharge part 20 Slot 21 1st protruding part 21A 1st internal surface 21B 1st inclined surface 22 2nd protruding part 22A 2nd internal surface 22B 2nd inclined surface 40 Drum cartridge 41 Photosensitivity Body drum 42 frame 50 developing cartridge 51 developing roller 52 developing housing 53 first pressing member 53B first contact surface 54 second pressing member 54B second contact surface 63 intermediate transfer belt X1 first axis X2 second axis

Claims (9)

A drum cartridge with a photoconductor drum that is rotatable about the first axis extending in the axial direction,
A developing cartridge having a developing roller rotatable about a second axis extending in the axial direction and a developing housing capable of accommodating toner.
A main body housing having a slot extending in the axial direction, wherein the slot allows the drum cartridge to be attached / detached in the axial direction, and the developing cartridge can be attached / detached in the axial direction. Tolerate, with the main body housing,
The developing housing is
A first main body portion that protrudes downward from the lower surface of the developing housing,
It has a first extending portion extending in an orthogonal direction orthogonal to the axial direction and the vertical direction from the lower end of the first main body portion.
The main body housing
The first part that protrudes upward,
A second portion extending in the orthogonal direction from the upper end of the first portion and having a second portion engaging with the first extending portion from above.
An image forming apparatus, characterized in that the developing cartridge is moved and the developing roller comes into contact with the photoconductor drum in a state where the second portion is engaged with the first extending portion. The first extending portion extends from the first main body portion in the direction orthogonal to the photoconductor drum in a direction away from the photoconductor drum.
The image forming apparatus according to claim 1, wherein the second portion extends from the first portion in a direction approaching the photoconductor drum in the orthogonal direction. The first main body portion has a first surface extending in the axial direction on the side opposite to the extending side of the first extending portion in the orthogonal direction.
The main body housing is a rail extending in the axial direction, and in the process of mounting the developing cartridge on the main body housing, a rail that comes into contact with the first surface to guide the mounting of the developing cartridge is further provided. The image forming apparatus according to claim 1 or 2, wherein the image forming apparatus has. The image forming apparatus according to any one of claims 1 to 3, wherein the first main body portion has a hollow portion. The image forming apparatus according to claim 4, wherein the hollow portion is formed by being recessed upward on the lower surface of the first main body portion. The image forming apparatus according to claim 4 or 5, wherein the cavity portion is positioned in the axial direction so as to overlap with the first extending portion. The developing housing is
A second main body that protrudes downward from the lower surface of the developing housing,
Further having a second extending portion extending in the orthogonal direction from the lower end of the second main body portion.
The second portion can be engaged with the second extending portion from above, and can be engaged with the second extending portion from above.
In the process of mounting the developing cartridge on the main body housing, the developing cartridge is moved and the developing roller comes into contact with the photoconductor drum in a state where the second portion is engaged with the second extending portion. The image forming apparatus according to any one of claims 1 to 6, wherein the image forming apparatus is to be used. The image forming apparatus is an intermediate transfer belt located above the drum cartridge and the developing cartridge in a state where the drum cartridge and the developing cartridge are mounted on the main body housing, and the drum cartridge and the developing apparatus are further formed. The image according to any one of claims 1 to 7, wherein the developing cartridge is provided with an intermediate transfer belt with which the surface of the photoconductor drum comes into contact with the developing cartridge mounted on the main body housing. Forming device. A plurality of the developing cartridges are provided side by side in an arrangement direction orthogonal to the axial direction, and a plurality of the first portion and the second portion are provided corresponding to the plurality of the developing cartridges. The image forming apparatus according to any one of claims 1 to 8.

Images