The present disclosure relates to a developing cartridge.
Conventionally, there have been known electro-photographic type image-forming apparatuses such as laser printers and LED printers. Such a conventional image-forming apparatus includes a developing cartridge. The developing cartridge includes a developing roller for supplying developing agent. One of such conventional image-forming apparatuses is disclosed in a prior art. The image-forming apparatus described therein includes a drum cartridge including a photosensitive drum. The developing cartridge is attachable to the drum cartridge. Upon attachment of the developing cartridge to the drum cartridge, the photosensitive drum and the developing roller contact with each other.
The image-forming apparatus according to the above prior art is switchable between a state where the developing roller and the photosensitive drum are in contact with each other and a state where the developing roller and the photosensitive drum are in separation from each other. In the image-forming apparatus according to the above prior art, components for moving the developing cartridge to separate the developing roller from the photosensitive drum are provided at each side of a drum unit. The components at each side must receive a driving force from a main body of the image-forming apparatus.
In view of the foregoing, it is an object of the present disclosure to provide a developing cartridge capable of providing separation between the developing roller and photosensitive drum by a driving force transmitted from only one side without necessitating application of driving force to both sides.
In order to attain the above and other objects, according to an aspect, the present disclosure provides a developing cartridge including a casing, a developing roller, and a first cam. The casing is configured to accommodate therein developing agent. The developing roller is rotatable about a developing-roller axis extending in a first direction and is contactable with a photosensitive drum. The developing roller has a peripheral surface a portion of which is exposed to an outside of the casing in a second direction and another portion of the peripheral surface opposite the exposed portion in the second direction is positioned inside the casing. The first cam is positioned at an outer surface of one end portion of the casing in the second direction. The first cam is movable in a third direction relative to the casing and the developing roller between a first position and a second position closer to the developing roller than the first position is to the developing roller in the third direction. The first cam has a first inclined surface and a second inclined surface. The first inclined surface is configured to receive a pressing force directing from one end portion of the casing in the first direction toward another end portion of the casing in the first direction. A distance in the second direction between the second inclined surface and the casing varies as the second inclined surface extends away from the developing roller in the third direction. The first cam is movable between the first position and the second position in response to application of the pressing force to the first inclined surface.
The particular features and advantages of the embodiment(s) as well as other objects will become apparent from the following description taken in connection with the accompanying drawings, in which:
Hereinafter, one embodiment of the disclosure will be described with reference to accompanying drawings.
In the following description, a direction in which a rotational axis (developing-roller axis) of a developing roller extends will be called as a “first direction.” On a peripheral surface of the developing roller, a portion exposed to outside of a casing and a portion accommodated within the casing will be assumed to be arranged side by side in a “second direction.” Here, the first direction and the second direction cross each other, preferably orthogonal to each other. Further, a direction crossing both the first and second directions (preferably, orthogonal to the first and second directions) will be called as a “third direction.”
<1. Overall Configuration of Image-Forming Apparatus>
<1-1. Overall Configuration of Main Body Portion>
Hereinafter, an overall configuration of the main body portion 9 will be described. As illustrated in
The main-body frame 101 is a generally rectangular parallelepiped and has an internal space therein. The drum cartridge 2 with the developing cartridges 1 attached thereto can be accommodated in the internal space of the main-body frame 101. Further, in the main-body frame 101, four chargers (not illustrated), four light sources (not illustrated), the transfer belt, and the controller 102 are provided.
The main-body frame 101 is a generally rectangular parallelepiped and defines an internal space therein. The drum cartridge 2 with the developing cartridges 1 attached thereto is configured to be accommodated in the internal space of the main-body frame 101. In the main-body frame 101, four chargers (not illustrated), four light sources (not illustrated), the transfer belt, and the controller 102 are also positioned.
The transfer belt is an endless belt for conveying printing sheets. In a state where the drum cartridge 2 to which the developing cartridges 1 are attached is positioned in the internal space of the main-body frame 101, the transfer belt is positioned opposite to developing rollers 30 with respect to photosensitive drums 21. The transfer belt has an outer peripheral surface contactable with outer peripheral surfaces of the respective photosensitive drums 21.
The controller 102 includes a processor such as a CPU, and a main-body memory. The main-body memory is a readable and writable storage medium, such as a Flash ROM and EEPROM. The main-body memory is configured to store computer programs for controlling operations performed in the image-forming apparatus 100. The processor is configured to execute various processing according to the computer programs stored in the main-body memory. That is, the processor is configured to execute various printing processing and other processing associated therewith to be performed in the image-forming apparatus 100.
<1-2. Overall Configurations of Developing Cartridges>
An overall structure of each developing cartridge 1 will be described next.
As illustrated in
The casing 10 has one end portion in the first direction which has a first outer surface 11. The casing 10 has another end portion in the first direction which has a second outer surface 12. The casing 10 also has the third outer surface 13 and a fourth outer surface 14 (
The four developing cartridges 1 accommodate therein toner of different colors (for example, cyan, magenta, yellow and black), respectively. However, the four developing cartridges 1 may accommodate therein toner of an identical color.
Each developing cartridge 1 includes one developing roller 30. The developing roller 30 is cylindrical in shape. The developing roller 30 is rotatable about a rotational axis (developing-roller axis) extending in the first direction. The developing roller 30 is supported by the casing 10 so as to be rotatable about the developing-roller axis.
The developing roller 30 includes a developing-roller body 31 and a developing-roller shaft 32. The developing-roller body 31 is hollow cylindrical in shape and extends in the first direction. The developing-roller body 31 is made from an elastic material, such as rubber. The developing-roller shaft 32 is a solid cylindrical member penetrating through the developing-roller body 31 in the first direction. The developing-roller shaft 32 is made from meal or electrically conductive resin. The developing-roller body 31 is fixed to the developing-roller shaft 32 without relative rotation therebetween. That is, the developing-roller body 31 is rotatable together with the developing-roller shaft 32 about the developing-roller axis. A part of an outer peripheral surface of the developing-roller body 31 in the second direction is exposed to the outside of the casing 10 through the opening 10C. A remaining part in the second direction of the outer peripheral surface of the developing-roller body 31 is positioned inside the casing 10.
The developing-roller shaft 32 has one end portion in the first direction. A developing-roller gear (not illustrated) is attached to the one end portion of the developing-roller shaft 32 in the first direction. The developing-roller gear is positioned at the first outer surface 11. The developing-roller gear is fixed to the one end portion of the developing-roller shaft 32 without relative rotation therebetween. Hence, a rotation of the developing-roller gear causes a rotation of the developing-roller shaft 32, so that the developing-roller body 31 is rotatable together with the developing-roller shaft 32.
Incidentally, the developing-roller shaft 32 may not extend through the developing-roller body 31 in the first direction. For example, the developing-roller shaft 32 may be configured of two shafts extending outward in the first direction respectively from both ends of the developing-roller body 31 in the first direction.
As illustrated in
The coupling 41 is a rotary member configured to receive a driving force supplied from a power source in the image-forming apparatus 100. The coupling 41 is rotatable about a rotational axis extending in the first direction. The coupling 41 has a fixing hole 411 recessed inward in the first direction. Upon attachment of the drum cartridge 2 to the main body portion 9 with the developing cartridges 1 attached to the drum cartridge 2, a transmission shaft (not shown) of the main body portion 9 is configured to be inserted in the fixing hole 411. The transmission shaft and the coupling 41 are thus connected each other without relative rotation therebetween. Accordingly, rotation of the transmission shaft causes rotation of the coupling 41. In accordance with the rotation of the coupling 41, the developing-roller gear rotates together with the developing roller 30. The rotation of the coupling 41 also causes rotations of a supply roller (not illustrated) and an agitator (not illustrated).
A handle 38 for being gripped by a user is positioned at an outer surface of another end portion of the casing 10 at the other side in the third direction.
<1-3. Overall Configuration of Drum Cartridge>
Next, an overall configuration of the drum cartridge 2 will be described next.
Each of the four photosensitive drums 21 depicted in
The frame 200 is a frame supporting the four photosensitive drums 21. The frame 200 holds the four photosensitive drums 21 such that the photosensitive drums 21 are spaced away from one another in the second direction. The frame 200 includes a pair of side frames 201, 202 opposite each other in the first direction. The side frame 202 is positioned further in the first direction toward the other side than the side frame 201. The photosensitive drums 21 are rotatably supported by the side frames 201 and 202.
For performing a printing process in the image-forming apparatus 100, the controller 102 drives a motor (not illustrated) so that the photosensitive drums 21 and the developing rollers 30 can rotate by a driving force transmitted from the motor through the transmission shaft and the coupling 41. Further, the controller 102 supplies power to the chargers (not illustrated) to charge the outer peripheral surfaces of the respective photosensitive drums 21. The controller 102 further causes the light sources (not illustrated) to emit light onto the outer peripheral surfaces of the respective photosensitive drums 21. In this way, an electrostatic latent image corresponding to a printing image is formed on the outer peripheral surface of each photosensitive drum 21. The toner accommodated in each developing cartridge 1 is then supplied through the corresponding developing roller 30 to the electrostatic latent image formed on the corresponding photosensitive drum 21. Thus, the electrostatic latent image becomes a visible toner image on the outer peripheral surface of each photosensitive drum 21.
Then, a printing sheet is conveyed between each photosensitive drum 21 and the transfer belt, whereby the toner image is transferred from the outer peripheral surface of each photosensitive drum 21 onto the printing sheet. The printing sheet carrying the toner image is then conveyed to a fixing unit (not illustrated) where the toner image is thermally fixed to the printing sheet. Image printing on the printing sheet is performed in this way.
In the image-forming apparatus 100, it may be preferable that the developing rollers 30 be separated from the corresponding photosensitive drums 21, for example, in order to change colors for printing or during a standby period. For this purpose, the image-forming apparatus 100 of the present embodiment provides a contacting state and a separated state. The contacting state denotes a state where the developing rollers 30 and the photosensitive drums 21 are in contact with each other in a state where the developing cartridges 1 are attached to the drum cartridge 2. The separated state denotes a state where the developing rollers 30 and the photosensitive drums 21 are separated from each other in the state where the developing cartridges 1 are attached to the drum cartridge 2.
To this effect, as components for realizing the contact and the separation, each developing cartridge 1 includes a first cam 61, a second cam 62, a first resilient member 63, a second resilient member 64, a first guide shaft 65, a second guide shaft 66, and a connection bar 67. Further, as components for realizing the contact and the separation, the drum cartridge 2 includes a first pressure contact portion 26 and a second pressure contact portion 27. As components for realizing the contact and the separation, the main body portion 9 includes four drive shafts 103.
<2. Components in Drum Cartridge for Contact and Separation>
Hereinafter, components of the drum cartridge 2 for performing the contact and the separation between the developing rollers 30 and the photosensitive drums 21 will be described with reference to
As illustrated in
As illustrated in an enlarged view in
As illustrated in another enlarged view in
The first pressure contact portion 26 and the corresponding second pressure contact portion 27 are positioned to be spaced away from each other in the first direction. As described later, the first cam 61 of each developing cartridge 1 is contactable with the first pressure contact surface 260 of the corresponding first pressure contact portion 26, and the second cam 62 of each developing cartridge 1 is contactable with the second pressure contact surface 270 of the corresponding second pressure contact portion 270.
<3. Components in Main Body Portion for Contact and Separation>
Next, components of the main body portion 9 for realizing the contact and separation between the developing rollers 30 and the photosensitive drums 21 will be described.
The main body portion 9 includes four drive shafts 103 (see
<4. Components in Developing Cartridge for Contact and Separation>
Next, components of each developing cartridge 1 for realizing the contact and the separation between the developing roller 30 and the corresponding photosensitive drum 21 will be described with reference to
As the components for the contact and separation, the developing cartridge 1 includes the first cam 61, the second cam 62, the first resilient member 63, the second resilient member 64, the first guide shaft 65, the second guide shaft 66, and the connection bar 67.
As illustrated in
The first inclined surface 61a is a flat surface sloping with respect to the first direction and the third direction. The first inclined surface 61a is parallel to the second direction. Specifically, the first inclined surface 61a is sloped to be distant from the first outer surface 11 in the first direction as extending toward the developing roller 30 in the third direction.
The second inclined surface 61b is a flat surface sloping with respect to the second direction and the third direction. The second inclined surface 61b is parallel to the first direction. Specifically, the second inclined surface 61b is sloped to extend toward the third outer surface 13 in the second direction as approaching the developing roller 30 in the third direction. That is, a distance between the second inclined surface 61b and the casing 10 in the second direction increases as the second inclined surface 61b extends away from the developing roller 30 in the third direction.
The first inclined surface 61a and the second inclined surface 61b are different surfaces of the first cam 61. The first inclined surface 61a is generally trapezoidal in shape as viewed from one side thereof in the first direction. The trapezoidal shape has a short side at one side thereof in the third direction and a long side at the other side thereof in the third direction. The second inclined surface 61b is generally trapezoidal in shape as viewed from one side thereof in the second direction. The trapezoidal shape has a long side at the one side in the third direction and a short side at the other side in the third direction. The first inclined surface 61a has a hypotenuse at the one side in the second direction that is connected to a hypotenuse of the second inclined surface 61b at the one side in the first direction.
The first cam 61 also has the first surface 61e and the second surface 61d. The first surface 61e and the second surface 61d are perpendicular to the third direction. The first surface 61e is at one end portion of the first cam 61 at the one side in the third direction. The second surface 61d is at another end portion of the first cam 61 at the other side in the third direction.
The first through-hole 61c extends in the third direction throughout the first cam 61. The first through-hole 61c has a circular cross-section. The first through-hole 61c has an end at the other side in the third direction that is open at the second surface 61d of the first cam 61.
The first recess 61f is recessed at the first surface 61e in the third direction toward the other side (toward the second surface 61d). The first recess 61f has a cross-sectional area greater than a cross-sectional area of the first through-hole 61c. The first through-hole 61c has one end in the third direction (at the one side) that is connected to an inner space of the first recess 61f.
The first resilient member 63 is a coil spring extending in the third direction. The first resilient member 63 is expandable and shrinkable in the third direction. The first resilient member 63 has one end portion seated on a bottom of the first recess 61f (see
The first guide shaft 65 extends in the third direction, and has a solid cylindrical shape or solid prismatic columnar shape. The first guide shaft 65 is positioned at the third outer surface 13 of the casing 10. The first guide shaft 65 is positioned inside the first resilient member 63. The first guide shaft 65 has one end connected to the first flat surface of the first seat member 43a. The first guide shaft 65 is inserted in the first through-hole 61c. Hence, the first guide shaft 65 extends throughout the first cam 61 in the third direction.
The first guide shaft 65 has another end in the third direction connected to a second seat member 43b (see
The one end of the first guide shaft 65 is fixed to the first flat surface of the first seat member 43a by a fastener of a well-known configuration, such as a screw and a pin. The other end of the first guide shaft 65 is fixed to the second flat surface of the second seat member 43b by a fastener of a well-known configuration, such as a screw and a pin. That is, each end of the first guide shaft 65 in the third direction is supported by the casing 10 through the gear cover 43. The first cam 61 is movable in the third direction along the first guide shaft 65. The first resilient member 63 urges the first cam 61 in the third direction toward the other side (from the one end portion toward the other end portion in the third direction of the casing 10). Hence, the first cam 61 is urged by an urging force of the first resilient member 63 toward the first position (
As illustrated in
The third inclined surface 62a is a flat surface sloping with respect to the second direction and the third direction. The third inclined surface 62a is parallel to the first direction. Specifically, the third inclined surface 62a is sloped to extend toward the third outer surface 13 in the second direction as approaching toward the developing roller 30 in the third direction. That is, a distance between the third inclined surface 62a and the casing 10 in the second direction increases as the third inclined surface 62a extends away from the developing roller 30 in the third direction.
The third inclined surface 62a is generally trapezoidal in shape as viewed in the second direction from the one side toward the other side. The trapezoidal shape has a long side at the one side in the third direction and a short side at the other side in the third direction. The second cam 62 has the third surface 62d and the fourth surface 62b. The third surface 62d and the fourth surface 62b are perpendicular to the third direction. The third surface 62d is at one end of the second cam 62 in the third direction. The fourth surface 62b is positioned further in the third direction toward the other side than the second cam 62 in the second cam 62.
The second through-hole 62c extends in the third direction throughout the second cam 62. The second through-hole 62c has a circular cross-section. The second through-hole 62c has an end at the other side in the third direction that is open at the fourth surface 62b of the second cam 62.
The second recess (not illustrated) is recessed at the third surface 62d in the third direction toward the other side (toward the fourth surface 62b). The second recess has a cross-sectional area greater than a cross-sectional area of the second through-hole 62c. The second through-hole 62c has one end at the one side in the third direction that is connected to an inner space of the second recess.
The second resilient member 64 is a coil spring extending in the third direction. The second resilient member 64 is expandable and shrinkable in the third direction. The second resilient member 64 has one end portion seated on a bottom of the second recess. That is, the one end portion of the second resilient member 64 is accommodated in the inner space of the second recess. The second resilient member 64 has another end portion connected to a third seat member 10D (
The second guide shaft 66 extends in the third direction, and has a solid cylindrical shape or solid prismatic columnar shape. The second guide shaft 66 is positioned at the third outer surface 13 of the casing 10. The second guide shaft 66 is positioned inside the second resilient member 64. The second guide shaft 66 has one end connected to the third flat surface of the third seat member 10D. The second guide shaft 66 is inserted in the second through-hole 62c. Hence, the second guide shaft 66 extends throughout the second cam 62 in the third direction.
The second cam 62 has another end connected to a fourth seat member 10E (
The one end of the second guide shaft 66 is fixed to the third flat surface of the third seat member 10D by a fastener of a well-known configuration, such as a screw and a pin. The other end of the second guide shaft 66 is fixed to the fourth flat surface of the fourth seat member 10E by a fastener of a well-known configuration, such as a screw and a pin. Hence, each end of the second guide shaft 66 in the third direction is supported by the casing 10. The second cam 62 is movable in the third direction along the second guide shaft 66. The second resilient member 64 urges the second cam 62 in the third direction toward the other side (from the one end portion to the other end portion of the casing 10 in the third direction). Hence, the second cam 62 is urged by an urging force of the second resilient member 64 toward the third position from the fourth position.
The connection bar 67 extends in the first direction and has a solid prismatic columnar shape or solid cylindrical shape. The connection bar 67 is positioned between the first cam 61 and the second cam 62 in the first direction. The connection bar 67 connects the first cam 61 to the second cam 62. Specifically, the first cam 61 is connected to one end portion of the connection bar 67 at the one side in the first direction. The second cam 62 is connected to another end portion of the connection bar 67 at the other side in the first direction. Hence, the second cam 62 is movable in the third direction in interlocking relation to the first cam 61.
<5. Movement of Each Component at the Time of Switching Between Contact and Separation>
Hereinafter, how each component operates for realizing switching between the contact and the separation will be described with reference to
In the image-forming apparatus 100, in a case where the drive shaft 103 is driven or moved toward the other side in the first direction to the advanced position, the first inclined surface 61a of the corresponding first cam 61 is pressed by the drive shaft 103. That is, the first inclined surface 61a of the first cam 61 receives a pressing force F directing from the one end portion toward the other end portion of the casing 10 in the first direction.
The pressing force F applied to the first inclined surface 61a from the drive shaft 103 is converted into a force directing in the third direction by contact of the drive shaft 103 with the first inclined surface 61a. The first cam 61 is thus pressed toward the one side in the third direction. As the pressing force F pressing the first cam 61 toward the one side in the third direction is greater than the urging force of the first resilient member 63, the first cam 61 at the first position is caused to move in the third direction toward the one side to be at the second position.
In the meantime, the second inclined surface 61b is in contact with the first pressure contact surface 260 of the first pressure contact portion 26. In accordance with the movement of the first cam 61, a contacting position between the second inclined surface 61b and the first pressure contact surface 260 is shifted over the second inclined surface 61b from a position close to the first surface 61e to a position close to the second surface 61d. As a result, a distance between the first pressure contact surface 260 of the first pressure contact portion 26 and the casing 10 in the second direction is gradually increased. Since the second inclined surface 61b is pressed by the first pressure contact surface 260 of the first pressure contact portion 26, the casing 10 and the developing roller 30 move together with the first cam 61 in the second direction to separate the developing roller 30 from the corresponding photosensitive drum 21.
According to another aspect, because of the contact between the second inclined surface 61b and the first pressure contact surface 260 of the first pressure contact portion 26, the force moving the first cam 61 toward the one side in the third direction is converted into the force pressing the first cam 61 in the second direction toward the other side. As a result, the casing 10 and the developing roller 30 move together with the first cam 61 in the second direction toward the other side, thereby separating the developing roller 30 from the photosensitive drum 21.
Thereafter, in a case where the drive shaft 103 is retracted in the first direction toward the one side (from the other end portion to the one end portion of the casing 10 in the first direction), the first cam 61 moves toward the other side in the third direction by the urging force of the first resilient member 63. Hence, the first cam 61 moves from the second position to the first position.
Here, the frame 200 of the drum cartridge 2 includes a pressure mechanism (not illustrated) for pressing the casing 10 of each developing cartridge 1 toward the corresponding photosensitive drum 21. Since the pressure mechanism moves the developing cartridge 1 in the second direction toward the one side in this state, the contacting state between the developing roller 30 and the corresponding photosensitive drum 21 is restored. In this way, the state of image forming apparatus 100 is switchable between the contacting state (
In accordance with the movement of the first cam 61 between the first position and the second position, the second cam 62 also moves between the third position and the fourth position through the connection bar 67. By the movement of the second cam 62, the third inclined surface 62a is pressed by the second pressure contact surface 270 of the second pressure contact portion 27, so that the casing 10 and the developing roller 30 move in the second direction together with the second cam 62. In this way, both end portions of the casing 10 in the first direction are respectively pressed by the first pressure contact portion 26 and the second pressure contact portion 27, which are components of the drum cartridge 2, to move the casing 10 in the second direction toward the other side. Accordingly, this structure can reduce a likelihood that the casing 10 may be slanted with respect to the first direction at the time of switching between the contacting state and the separated state.
Incidentally, as illustrated in
As illustrated in
As illustrated in
Similarly, in the attached state of the developing cartridge 1 to the drum cartridge 2 and the second cam 62 is at the third position, the third inclined surface 62a is in contact with the second pressure contact surface 270 of the second pressure contact portion 27 which is part of the drum cartridge 2. At this time, the developing roller 30 is in contact with the corresponding photosensitive drum 21. On the other hand, in the attached state of the developing cartridge 1 to the drum cartridge 2 and the second cam 62 is at the fourth position, the third inclined surface 62a is separated from the second pressure contact surface 270 of the second pressure contact portion 27. At this time, the developing roller 30 is in separation from the photosensitive drum 21.
<6. Summary>
As described above, the developing cartridge 1 according to the embodiment includes the casing 10, the developing roller 30, and the first cam 61. The first cam 61 has the first inclined surface 61a, and the second inclined surface 61b. In the developing cartridge 1, the first cam 61 is movable between the first position and the second position in response to the application of the pressing force F to the first inclined surface 61a. During the movement of the first cam 61 between the first position and the second position, the second inclined surface 61b is pressed by the first pressure contact surface 260 which is a part of the drum cartridge 2. Hence, the developing roller 30 can be separated from the corresponding photosensitive drum 21.
As such, in the developing cartridge 1 according to the embodiment, separation of the developing roller 30 from the corresponding photosensitive drum 21 can be performed by the driving force applied only to the one side in the first direction of the developing cartridge 1. Application of driving force to both sides in the first direction of the developing cartridge 1 is unnecessary.
Further, in the developing cartridge 1 according to the embodiment, the first inclined surface 61a is inclined with respect to the first direction. The pressing force F applied to the first inclined surface 61a is converted to the force directing in the third direction by the inclination of the first inclined surface 61a. As a result, the first cam 61 can move in the third direction between the first position and the second position.
Further, in the developing cartridge 1 according to the embodiment, the second inclined surface 61b is inclined with respect to the second direction and the third direction. Hence, the pressing force F for moving the first cam 61 from the first position to the second position is converted into pressing force of the first pressure contact surface 260 which is the part of the drum cartridge 2 for moving the second inclined surface 61b in the second direction. As a result, the casing 10 and the developing roller 30 can move in the second direction, thereby separating the developing roller 30 from the corresponding photosensitive drum 21.
Further, the developing cartridge 1 according to the embodiment includes the first resilient member 63. Hence, the first cam 61 can be returned to the first position by the urging force of the first resilient member 63, after the first cam 61 moves from the first position to the second position by the pressing force F applied to the second inclined surface 61b of the first cam 61 from the first pressure contact surface 260 which is the part of the drum cartridge 2. Further, the second inclined surface 61b can easily move along the first pressure contact surface 260.
Further, in the developing cartridge 1 according to the embodiment, the first resilient member 63 is a coil spring. The first cam 61 is allowed to move between the first position and the second position in accordance with expansion and shrinkage of the coil spring.
Further, in the developing cartridge 1 according to the embodiment, the first cam 61 has the first recess 61f. The one end portion of the first resilient member 63 is positioned at the bottom portion of the first recess 61f. Since the one end portion of the first resilient member 63 is accommodated in the first recess 61f, a larger stroke of expansion/shrinkage of the first resilient member 63 can be obtained than otherwise.
Further, the developing cartridge 1 according to the embodiment includes the first guide shaft 65. The first cam 61 is movable in the third direction along the first guide shaft 65. Hence, movement of the first cam 61 in the third direction between the first position and the second position can be realized at high accuracy.
Further, in the developing cartridge 1 according to the embodiment, the first guide shaft 65 is positioned inside the first resilient member 63. Hence, deflection of the first resilient member 63 in a direction crossing the third direction can be restrained. As a result, accurate operations of the first cam 61 can be attained.
Further, in the developing cartridge 1 according to the embodiment, the first guide shaft 65 extends throughout the first cam 61 in the third direction. Hence, space saving layout of the first guide shaft 65 and the first cam 61 can be attained. Further, the first cam 61 can move in the third direction at high accuracy because the movement of the first cam 61 is guided by the first guide shaft 65.
Further, the main body portion 9 which can accommodate the drum cartridge 2 includes the drive shafts 103. The first cam 61 moves from the first position to the second position in accordance with the application of the pressing force F to the first inclined surface 61a from the corresponding drive shaft 103. Hence, the developing roller 30 can be separated from the photosensitive drum 21 by the driving force applied from the main body portion 9.
Further, the developing cartridge 1 according to the embodiment includes the second cam 62. The second cam 62 has the third inclined surface 62a. The third inclined surface 62a is pressed by the second pressure contact surface 270 which is a part of the drum cartridge 2 during movement of the third inclined surface 62a between the third position and the fourth position. Because the second inclined surface 61b and the third inclined surface 62a are positioned at the one end portion and the other end portion of the casing 10 in the first direction, respectively, the one end portion and the other end portion in the first direction of the casing 10 can be pressed by the first pressure contact surface 260 and the second pressure contact surface 270, respectively, which are parts of the drum cartridge 2. As a result, the developing roller 30 can be securely separated from the corresponding photosensitive drum 21.
Further, in the developing cartridge 1 according to the embodiment, the third inclined surface 62a is inclined with respect to the second direction and the third direction. Therefore, the force for moving the second cam 62 from the third position to the fourth position is converted into the force applying from the second pressure contact surface 270 (the part of the drum cartridge 2) for moving the third inclined surface 62a in the second direction. As a result, the casing 10 and the developing roller 30 can be moved in the second direction, thereby separating the developing roller 30 from the corresponding photosensitive drum 21.
Further, the developing cartridge 1 according to the embodiment includes the connection bar 67 for connecting the first cam 61 and the second cam 62 together. Hence, interlocking movement of the first cam 61 and the second cam 62 can be attained. Accordingly, inclined posture of the developing cartridge 1 with respect to the first direction can be restrained in the state where the developing cartridge 1 is separated from the corresponding photosensitive drum 21.
<7. Modifications>
While the description has been made in detail with reference to the above embodiment, it would be apparent to those skilled in the art that many modifications and variations may be made therein without departing from the scope of the disclosure.
For example, in the above-described embodiment, the first guide shaft 65 is inserted in the first through-hole 61c of the first cam 61. Instead, the first cam may have a groove extending throughout a length thereof in the third direction, and the first guide shaft may be inserted in the groove.
In the above-described embodiment, the pressure contact portions 26 and 27 have the pressure contact surfaces 260, 270, respectively, which have inclined flat surfaces. Instead, the pressure contact portions may be cylindrical members rotatable about rotation axes extending in the first direction.
In the above-described embodiment, the first resilient member 63 and the second resilient member 64 are compression coil springs. Instead, the first resilient member and the second resilient member may be tension coil springs. In the latter case, one end portion of the first resilient member may be connected to the second surface 61d of the first cam 61, and another end portion of the first resilient member may be connected to the second flat surface of the second seat member 43b. Further, one end portion of the second resilient member may be connected to the fourth surface 62b of the second cam 62, and another end portion of the second resilient member may be connected to the fourth flat surface of the fourth seat member 10E.
In the above-described embodiment, the developing roller 30 is in contact with the photosensitive drum 21 when the first cam 61 is at the first position, and the developing roller 30 is separated from the photosensitive drum 21 when the first cam 61 is at the second position. Alternatively, the developing roller 30 may be in contact with the photosensitive drum 21 when the first cam 61 is at the second position, and the developing roller 30 may be separated from the photosensitive drum 21 when the first cam 61 is at the first position. In the latter case, the second inclined surface 61b of the first cam and the third inclined surface 62a of the second cam 62 may be sloped to approach the casing 10 in the second direction as extending away from the developing roller 30 in the third direction.
Note that the detailed configuration of the developing cartridge 1 may be different from that described above and illustrated in the drawings. Further, each component in the above-described embodiment and modifications may be suitably combined together as long as no technical conflicts is incurred.
Number | Date | Country | Kind |
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JP2019-063301 | Mar 2019 | JP | national |
This is a by-pass continuation application of International Application No. PCT/JP2020/005469 filed on Feb. 13, 2020 which claims priority from Japanese Patent Application No. 2019-063301 filed Mar. 28, 2019. The entire contents of the earlier applications are incorporated herein by reference.
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Entry |
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International Search Report and Written Opinion issued in PCT/JP2020/005469, dated Mar. 17, 2020. |
Number | Date | Country | |
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20210356882 A1 | Nov 2021 | US |
Number | Date | Country | |
---|---|---|---|
Parent | PCT/JP2020/005469 | Feb 2020 | US |
Child | 17374387 | US |