JP7131681B2 - developer cartridge - Google Patents

Description

The present invention relates to developer cartridges.

2. Description of the Related Art Conventionally, electrophotographic image forming apparatuses such as laser printers and LED printers are known. A developing cartridge is used in the image forming apparatus. The developer cartridge has a developer roller for supplying toner. The developer cartridge described in Patent Document 1 is attached to the drawer unit. The drawer unit is accommodated inside the image forming apparatus and pulled out from the image forming apparatus. The drawer unit has a photosensitive drum. When the developing cartridge is attached to the drawer unit, the photosensitive drum and the developing roller face each other.

Further, the developing cartridge described in Patent Document 2 is attached to the drum cartridge. The drum cartridge has a photosensitive drum. When the developing cartridge is attached to the drum cartridge, the photosensitive drum faces the developing roller. Then, the developing cartridge is attached to the image forming apparatus while the developing cartridge is attached to the drum cartridge.

JP 2011-59510 A JP 2013-54058 A

Further, conventionally, a developer cartridge having a storage medium is also known. The storage medium is, for example, an IC chip. The storage medium has an electrical contact surface. The electrical contact surface contacts an electrical connector provided on the image forming apparatus or the drawer unit. However, when the developer cartridge is attached to the image forming apparatus or drawer unit, the electrical contact surface rubs against the projections of the image forming apparatus or drawer unit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure capable of suppressing rubbing of an electrical contact surface when a developing cartridge is installed.

In order to solve the above-mentioned problems, a first invention of the present application is a developer cartridge, comprising: a housing containing a developer therein; a storage medium having an electrical contact surface; An elastic member extending in one direction, the elastic member being stretchable in the first direction between a first state and a second state, and a holder having the electrical contact surface located on the outer surface in the first direction. a holder movable in the first direction between a first position and a second position of the outer surface with respect to the housing, wherein the elastic member is in the first state; the length in the first direction is longer than the length of the elastic member in the first direction in the second state, and the holder is positioned at the first position when the elastic member is in the first state; The holder is positioned at the second position when the elastic member is in the second state.

A second invention of the present application is the developer cartridge according to the first invention, wherein the holder has a first end including the outer surface and a second end separated from the first end in the first direction. wherein the elastic member is positioned between the first end and the second end in the first direction.

A third invention of the present application is the developer cartridge according to the second invention, wherein the distance in the first direction between the first end portion and the second end portion in the first state is longer than the distance in the first direction between the first end and the second end.

A fourth invention of the present application is the developer cartridge according to any one of the first to third inventions, wherein the position of the outer surface with respect to the housing is the first position, the second position, and the third position. movable in said first direction between positions, said elastic member being stretchable in said first direction between said first state, said second state and a third state; is longer than the length of the elastic member in the first direction in the second state, and the length of the elastic member in the first direction in the third state is , longer than the length of the elastic member in the first direction in the second state, and the holder is positioned at the third position when the elastic member is in the third state.

A fifth invention of the present application is the developer cartridge according to the second invention, wherein the position of the outer surface with respect to the housing is in the first direction between the first position, the second position, and the third position. movable, said elastic member being stretchable in said first direction between said first state, said second state and a third state, said first direction of said elastic member in said first state; length is longer than the length of the elastic member in the first direction in the second state and between the first end and the second end in the first state in the first direction is longer than the distance in the first direction between the first end and the second end in the second state, and the length of the elastic member in the first direction in the third state is longer than the length in the first direction of the elastic member in the second state, and the distance in the first direction between the first end and the second end in the third state is , the distance in the first direction between the first end and the second end in the second state, and the holder is in the third position when the elastic member is in the third state. Located in

A sixth invention of the present application is the developer cartridge according to any one of the first invention to the fifth invention, wherein the position of the outer surface with respect to the housing is: is movable from the first position to the second position, and in the first position, a portion of the holder and the electrical contact surface are in a non-contact state that does not contact a portion of the image forming apparatus; In the second position, the portion of the holder or the electrical contact surface is in contact with the portion of the image forming apparatus.

A seventh invention of the present application is the developer cartridge according to the fourth invention or the fifth invention, wherein the position of the outer surface with respect to the housing changes from the first position according to the mounting of the developer cartridge to the image forming apparatus. is movable to the third position through the second position, and in the first position, a portion of the holder and the electrical contact surface are in a non-contact state that does not contact a portion of the image forming apparatus; At the second position, a portion of the holder or the electrical contact surface is in contact with a portion of the image forming apparatus. At the third position, the electrical contact surface is in contact with the image forming apparatus. A connector contact state for contacting the electrical connector of the device.

An eighth invention of the present application is the developer cartridge according to the fourth invention, the fifth invention, or the seventh invention, wherein the length of the elastic member in the first direction in the third state is longer than the natural length of the elastic member. is also short.

A ninth invention of the present application is the developer cartridge according to any one of the first invention to the eighth invention, wherein the first direction is a direction perpendicular to the electrical contact surface.

A tenth invention of the present application is the developer cartridge according to any one of the first invention to the ninth invention, wherein the holder is movable together with the storage medium.

An eleventh invention of the present application is the developer cartridge according to any one of the first to tenth inventions, wherein the holder holds the electrical contact surface on the outer surface.

A twelfth invention of the present application is the developer cartridge according to any one of the first to eleventh inventions, wherein the storage medium is positioned on the outer surface of the holder.

A thirteenth invention of the present application is the developer cartridge according to the twelfth invention, wherein the holder holds the storage medium on the outer surface.

A fourteenth invention of the present application is the developing cartridge according to any one of the first to thirteenth inventions, further comprising a developing roller rotatable about an axis extending in a direction different from the first direction.

A fifteenth invention of the present application is the developer cartridge according to any one of the first invention to the fourteenth invention, wherein the holder is positioned on a side portion of the housing.

A sixteenth invention of the present application is the developer cartridge according to any one of the first invention to the fifteenth invention, wherein the outer surface is one of the electrical contact surfaces in a second direction different from the first direction. a lateral first surface, the first surface being inclined with respect to the electrical contact surface.

A seventeenth aspect of the present application is the developing cartridge according to the sixteenth aspect, wherein the developing roller is rotatable about an axis extending in a third direction different from the first direction, and the one side of the housing in the second direction is rotatable. It further comprises a developer roller located on the side.

An eighteenth invention of the present application is the developer cartridge according to the sixteenth invention or the seventeenth invention, wherein the first surface extends from the third position toward the electrical contact surface to the fourth position, and , the third location is farther from the electrical contact surface than the fourth location.

A nineteenth invention of the present application is the developer cartridge according to the eighteenth invention, wherein the distance in the first direction between the third position and the fourth position is equal to the distance between the electrical contact surface and the fourth position. greater than the distance in the first direction between

A twentieth invention of the present application is the developer cartridge according to any one of the sixteenth invention to the nineteenth invention, wherein the first surface is provided on the image forming apparatus when the developer cartridge is attached to the image forming apparatus. A first guide surface that can be partially contacted.

A twenty-first invention of the present application is the developer cartridge according to any one of the sixteenth invention to the twentieth invention, wherein the outer surface is positioned on the other side of the electrical contact surface in the second direction. A surface includes a second surface slanted with respect to the electrical contact surface.

A 22nd aspect of the present application is the developing cartridge according to the 21st aspect, wherein the developing roller is rotatable about an axis extending in a third direction different from the first direction, wherein one side of the housing in the second direction is provided. It further comprises a developer roller located on the side.

A twenty-third invention of the present application is the developer cartridge according to the twenty-first invention or the twenty-second invention, wherein the second surface extends from the fifth position toward the electrical contact surface to the sixth position, , the fifth position is farther from the electrical contact surface than the sixth position.

A twenty-fourth invention of the present application is the developer cartridge according to the twenty-third invention, wherein the distance in the first direction between the fifth position and the sixth position is equal to the distance between the electrical contact surface and the sixth position. greater than the distance in the first direction between

A twenty-fifth invention of the present application is the developer cartridge according to any one of the twenty-first to twenty-fourth inventions, wherein the second surface is provided on the image forming apparatus when the developer cartridge is mounted on the image forming apparatus. is a second guide surface that can come into contact with a portion of the

A twenty-sixth invention of the present application is the developer cartridge according to any one of the first invention to the twenty-fifth invention, wherein the outer surface is formed on both sides of the electrical contact surface in a third direction different from the first direction. , wherein in the first direction the third surfaces are farther from the elastic member than the electrical contact surface.

A twenty-seventh invention of the present application is the developing cartridge according to the twenty-sixth invention, wherein the third surface is a third guide surface capable of coming into contact with a portion of the image forming apparatus when the developing cartridge is installed in the image forming apparatus. is.

A twenty-eighth aspect of the present application is the developing cartridge according to the twenty-sixth aspect or the twenty-seventh aspect, wherein the developing roller is rotatable about a shaft extending in the third direction, and is provided on one side of the casing in the second direction. Further provided is a developer roller located.

A twenty-ninth invention of the present application is the developing cartridge according to any one of the first to twenty-eighth inventions, wherein the elastic member is a spring.

A thirtieth invention of the present application is the developer cartridge according to the twenty-ninth invention, wherein the spring is a coil spring.

A thirty-first invention of the present application is the developer cartridge according to the twelfth invention or the thirteenth invention, wherein the storage medium has the electrical contact surface.

According to the first to thirty-first inventions of the present application, it is possible to suppress rubbing of the electrical contact surface when the developing cartridge is mounted.

Further, according to the second invention of the present application, the elastic member is provided between the first end and the second end of the holder, so that the first end including the outer surface is provided with respect to the second end. becomes movable in a first direction. As a result, it is possible to suppress rubbing of the electrical contact surface when the developing cartridge is installed in the image forming apparatus.

Further, according to the third invention of the present application, the distance in the first direction between the first end portion and the second end portion in the first state is the distance between the first end portion and the second end portion in the second state. longer than the distance in the first direction between Thus, the distance of the first end, including the outer surface, can vary with respect to the second end. As a result, it is possible to suppress rubbing of the electrical contact surface when the developing cartridge is installed in the image forming apparatus.

Further, according to the fourth invention of the present application, the position of the outer surface of the holder holding the electrical contact surface can be further moved from the second position to the third position in the first direction. As a result, it is possible to suppress rubbing of the electrical contact surface when the developing cartridge is installed in the image forming apparatus.

Further, according to the fifth invention of the present application, the elastic member is provided between the first end and the second end of the holder, so that the first end including the outer surface is provided with respect to the second end. is movable in the first direction, and the position of the outer surface of the holder on which the electrical contact surface is held can also be varied in the first direction from a second position to a third position. . As a result, it is possible to suppress rubbing of the electrical contact surface when the developing cartridge is installed in the image forming apparatus.

Further, according to the sixth aspect of the present application, even if the holder can come into contact with a part of the image forming apparatus, the holder can move from the first position to the second position. It is possible to suppress rubbing of the electrical contact surfaces when mounting the cartridge.

Further, according to the seventh invention of the present application, the position of the outer surface of the holder holding the electrical contact surface can be further moved from the second position to the third position in the first direction, and In the third position, the electrical contact surface is enabled for contact with the electrical connector of the image forming device. As a result, when the developing cartridge is attached to the image forming apparatus, the electrical contact surface is prevented from being rubbed, and the electrical contact can be brought into contact with the electrical connector of the image forming apparatus.

Further, according to the eighth invention of the present application, the length of the elastic member in the first direction in the third state is shorter than the natural length of the elastic member. can receive a repulsive force.

Moreover, according to the tenth invention of the present application, the storage medium can also move together with the holder.

Further, according to the eleventh invention of the present application, the holder can hold the electrical contact surface on the outer surface.

Further, according to the twelfth invention of the present application, the storage medium can be positioned on the outer surface.

Further, according to the thirteenth invention of the present application, the holder can hold the storage medium on its outer surface.

Further, according to the sixteenth invention of the present application, by having the first surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or detached from the image forming apparatus, the holder is held by the first surface. Guidance becomes possible.

Further, according to the eighteenth invention of the present application, by having the first surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or detached from the image forming apparatus, the holder is held by the first surface. Guidance becomes possible.

Further, according to the nineteenth invention of the present application, by having the first surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or detached from the image forming apparatus, the holder is held by the first surface. Guidance becomes possible.

Further, according to the twentieth invention of the present application, by having the first guide surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or detached from the image forming apparatus, the first guide surface It becomes possible to guide the holder.

Further, according to the 21st invention of the present application, by having the second surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or detached from the image forming apparatus, the holder is held by the second surface. Guidance becomes possible.

Further, according to the twenty-third invention of the present application, by having the second surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or detached from the image forming apparatus, the holder is held by the second surface. Guidance becomes possible.

Further, according to the twenty-fourth invention of the present application, by having the second surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or detached from the image forming apparatus, the holder is held by the second surface. Guidance becomes possible.

Further, according to the twenty-fifth invention of the present application, by providing the second guide surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or detached from the image forming apparatus, the second guide surface It becomes possible to guide the holder.

Further, according to the twenty-sixth invention of the present application, the third surface is inclined with respect to the electrical contact surface. It is possible to suppress rubbing of the electrical contact surface when the developing cartridge is installed in the device.

Further, according to the twenty-seventh invention of the present application, by providing the third guide surface inclined with respect to the electrical contact surface, when the developing cartridge is attached to or removed from the image forming apparatus, the third guide surface It is possible to suppress rubbing of the electrical contact surface when the developing cartridge is mounted in the image forming apparatus.

Further, according to the twenty-eighth invention of the present application, when the developing cartridge is installed in the image forming apparatus, the projection of the image forming apparatus does not come into contact with the electrical contact surface. This makes it possible to further suppress damage to the electrical contact surface.

3 is a perspective view of a developer cartridge; FIG. 3 is a perspective view of a developer cartridge; FIG. 3 is a perspective view of a developer cartridge; FIG. 3 is a perspective view of a developer cartridge; FIG. 3 is a perspective view of a developer cartridge; FIG. 1 is an exploded perspective view of an IC chip assembly; FIG. 1 is a cross-sectional view of an IC chip assembly; FIG. It is the figure which showed the mode when mounting|wearing developing cartridge. It is the figure which showed the mode when mounting|wearing developing cartridge. It is the figure which showed the mode when mounting|wearing developing cartridge. It is the figure which showed the mode when mounting|wearing developing cartridge. It is the figure which showed the mode when mounting|wearing developing cartridge. It is the figure which showed the mode when mounting|wearing developing cartridge. It is the figure which showed the mode when mounting|wearing developing cartridge. FIG. 11 is a diagram showing a state when a separation operation is performed; FIG. 11 is a partially exploded perspective view of a developer cartridge of a first modified example; FIG. 11 is a cross-sectional view of an IC chip assembly of a first modified example; FIG. 11 is a partial perspective view of a developer cartridge of a second modified example; FIG. 11 is a diagram showing movements of a columnar elastic body and an IC chip assembly of a second modified example; FIG. 11 is a diagram showing movements of a columnar elastic body and an IC chip assembly of a second modified example; It is the figure which showed the mode when mounting|wearing with the developing cartridge of a 2nd modification. It is the figure which showed the mode when mounting|wearing with the developing cartridge of a 2nd modification. FIG. 12 is a diagram showing a state when the separation operation of the developing cartridges of the second modified example is executed; FIG. 11 is a perspective view of a developing cartridge of a third modified example; It is the figure which looked at the developing cartridge of the 3rd modification from one side of the 3rd direction. It is the figure which looked at the developing cartridge of the 3rd modification from one side of the 3rd direction. It is the figure which looked at the developing cartridge of the 3rd modification from one side of the 3rd direction. FIG. 14 is an exploded perspective view of a first cover and an IC chip assembly of a fourth modified example; FIG. 11 is a cross-sectional view of a first cover and an IC chip assembly of a fourth modified example; FIG. 11 is a perspective view of an IC chip assembly of a fourth modified example; FIG. 11 is a partial perspective view of a developer cartridge of a fifth modified example; FIG. 20 is an exploded perspective view of a first cover and an IC chip assembly of a fifth modified example; FIG. 14 is a perspective view of a developer cartridge and a drum cartridge of a sixth modified example; FIG. 11 is a diagram showing how a drum cartridge of a sixth modified example is mounted in an image forming apparatus; FIG. 21 is an exploded perspective view of the vicinity of an IC chip assembly of a sixth modified example;

Preferred embodiments of the present invention will be described below with reference to the drawings.

In the following description, the direction intersecting the electrical contact surface (in this embodiment, the direction "perpendicular" to the electrical contact surface) is referred to as the "first direction". Also, the direction in which the casing 10 moves during the separation operation, which will be described later, is referred to as the "second direction." Also, the direction in which the rotation axis of the developing roller extends is referred to as the "third direction".

<1. Overall Configuration of Development Cartridge>
1 to 5 are perspective views of a developer cartridge 1 that is an example of the present invention. The developer cartridge 1 is a unit that is used in an electrophotographic image forming apparatus (for example, a laser printer or an LED printer) and supplies developer (for example, toner) to a photosensitive drum. As shown in FIG. 1, the developer cartridge 1 of the present embodiment is attached to a drawer unit 90 of the image forming apparatus. When replacing the developing cartridge 1, the drawer unit 90 is pulled out from the front of the image forming apparatus. The developing cartridges 1 are attached to the four cartridge holding portions 91 provided in the drawer unit 90, respectively. Each of the four cartridge holding units 91 is provided with a photosensitive drum.

In this embodiment, four developer cartridges 1 are attached to one drawer unit 90 . The four developer cartridges 1 contain developers of different colors (eg, cyan, magenta, yellow, and black). However, the number of developer cartridges 1 attached to the drawer unit 90 may be one to three, or may be five or more.

As shown in FIGS. 2 to 5, the developing cartridge 1 of this embodiment has a casing 10, an agitator 20, a developing roller 30, a first gear portion 40, a second gear portion 50, and an IC chip assembly 60. FIG.

The developing roller 30 is a roller rotatable around a rotation shaft extending in the third direction. The developing roller 30 of this embodiment has a roller body 31 and a roller shaft 32 . The roller body 31 is a cylindrical member extending in the third direction. Rubber having elasticity, for example, is used as the material of the roller body 31 . The roller shaft 32 is a cylindrical member penetrating the roller body 31 in the third direction. The roller shaft 32 is made of metal or conductive resin.

Note that the roller shaft 32 does not have to pass through the roller body 31 in the third direction. For example, a pair of roller shafts 32 may extend in the third direction from both ends of the roller body 31 in the third direction.

The agitator 20 has an agitator shaft 21 and stirring blades 22 . The agitator shaft 21 extends along a rotation axis extending in the third direction. The stirring blades 22 extend radially outward from the agitator shaft 21 . The stirring blade 22 is arranged inside the developer chamber 13 of the casing 10 . A first agitator gear 44 and a second agitator gear 51, which will be described later, are connected to both ends of the agitator shaft 21 in the third direction, respectively. Therefore, the agitator shaft 21 and the stirring blades 22 rotate together with the first agitator gear 44 and the second agitator gear 51 . When the stirring blade 22 rotates, the developer in the developer chamber 13 is stirred.

The casing 10 is a housing that can accommodate a developer (for example, toner) for electrophotographic printing. Casing 10 has a first outer surface 11 and a second outer surface 12 . The first outer surface 11 and the second outer surface 12 are separated from each other in the third direction. The first gear portion 40 and the IC chip assembly 60 are located on the first outer surface 11 . The second gear portion 50 is located on the second outer surface 12 . Casing 10 extends in a third direction between first outer surface 11 and second outer surface 12 . A developer chamber 13 containing a developer is provided inside the casing 10 .

Casing 10 has an opening 14 . The opening 14 communicates the developer chamber 13 with the outside. The opening 14 is located at one end of the casing 10 in the second direction. Developing roller 30 is positioned in opening 14 . That is, the developing roller 30 is positioned on one side of the casing 10 in the second direction. The roller body 31 is fixed relative to the roller shaft 32 so as not to rotate. One end of the roller shaft 32 in the third direction is fixed to a development gear 42 (to be described later) so as not to rotate relative to the roller shaft 32 . Therefore, when the developing gear 42 rotates, the roller shaft 32 also rotates, and the roller body 31 rotates together with the roller shaft 32 .

When the developer cartridge 1 receives a driving force, developer is supplied from the developer chamber 13 in the casing 10 to the outer peripheral surface of the developer roller 30 via a supply roller (not shown). At that time, the developer is triboelectrically charged between the supply roller and the developing roller 30 . On the other hand, a bias voltage is applied to the roller shaft 32 of the developing roller 30 . Therefore, the developer is attracted to the outer peripheral surface of the roller body 31 by the electrostatic force between the roller shaft 32 and the developer.

The developer cartridge 1 also has a layer thickness regulating blade (not shown). The layer thickness regulating blade makes the developer supplied to the outer peripheral surface of the roller body 31 have a constant thickness. After that, the developer on the outer peripheral surface of the roller body 31 is supplied to the photosensitive drum provided in the drawer unit 90 . At this time, the developer moves from the roller body 31 to the photosensitive drum according to the electrostatic latent image formed on the outer peripheral surface of the photosensitive drum. As a result, the electrostatic latent image is visualized on the outer circumferential surface of the photosensitive drum.

The first gear portion 40 is located on one side of the casing 10 in the third direction. That is, the first gear portion 40 is positioned on the first outer surface 11 . FIG. 4 is a perspective view of the developing cartridge 1 with the first gear portion 40 disassembled. As shown in FIG. 4 , the first gear portion 40 has a coupling 41 , a developing gear 42 , an idle gear 43 , a first agitator gear 44 and a first cover 45 . In FIG. 4, illustration of a plurality of gear teeth of each gear is omitted.

The coupling 41 is a gear that first receives the driving force supplied from the image forming apparatus. Coupling 41 can rotate around a rotation axis extending in the third direction. The coupling 41 has a coupling portion 411 and a coupling gear 412 . The coupling portion 411 and the coupling gear 412 are made of, for example, integral resin. The coupling portion 411 is provided with a fastening hole 413 recessed in the third direction. In addition, a plurality of gear teeth are provided on the outer peripheral portion of the coupling gear 412 at regular intervals over the entire circumference.

When the drawer unit 90 to which the developing cartridge 1 is attached is housed in the image forming apparatus, the drive shaft of the image forming apparatus is inserted into the fastening hole 413 of the coupling portion 411 . As a result, the drive shaft and the coupling portion 411 are connected so as not to rotate relative to each other. Therefore, when the drive shaft rotates, the coupling portion 411 rotates, and the coupling gear 412 rotates together with the coupling portion 411 .

The development gear 42 is a gear for rotating the development roller 30 . The development gear 42 can rotate around a rotation axis extending in the third direction. A plurality of gear teeth are provided on the outer peripheral portion of the developing gear 42 at equal intervals over the entire circumference. At least some of the gear teeth of the coupling gear 412 and at least some of the gear teeth of the developing gear 42 mesh with each other. The developing gear 42 is fixed to the end portion of the roller shaft 32 of the developing roller 30 in the third direction so as not to rotate relative to the developing roller 30 . Therefore, when the coupling gear 412 rotates, the developing gear 42 rotates, and the developing roller 30 rotates together with the developing gear 42 .

The idle gear 43 is a gear for transmitting the rotation of the coupling gear 412 to the first agitator gear 44 . The idle gear 43 can rotate around a rotation axis extending in the third direction. The idle gear 43 has a large diameter gear portion 431 and a small diameter gear portion 432 arranged in the third direction. The small diameter gear portion 432 is located between the large diameter gear portion 431 and the first outer surface 11 of the casing 10 . In other words, the large diameter gear portion 431 is further away from the first outer surface 11 than the small diameter gear portion 432 is. The diameter of the small-diameter gear portion 432 is smaller than the diameter of the large-diameter gear portion 431 . In other words, the diameter of the addendum circle of the small-diameter gear portion 432 is smaller than the diameter of the addendum circle of the large-diameter gear portion 431 . The large-diameter gear portion 431 and the small-diameter gear portion 432 are formed of, for example, integral resin.

A plurality of gear teeth are provided at regular intervals over the entire circumference of each of the outer peripheral portions of the large-diameter gear portion 431 and the small-diameter gear portion 432 . The number of gear teeth of the small diameter gear portion 432 is smaller than the number of gear teeth of the large diameter gear portion 431 . At least a portion of the plurality of gear teeth of the coupling gear 412 and at least a portion of the plurality of gear teeth of the large-diameter gear portion 431 mesh with each other. At least some of the gear teeth of the small-diameter gear portion 432 and at least some of the gear teeth of the first agitator gear 44 mesh with each other. When the coupling gear 412 rotates, the large-diameter gear portion 431 rotates, and the small-diameter gear portion 432 rotates together with the large-diameter gear portion 431 . As the small-diameter gear portion 432 rotates, the first agitator gear 44 also rotates.

The first agitator gear 44 is a gear for rotating the agitator 20 inside the developer chamber 13 . The first agitator gear 44 can rotate around a rotation axis extending in the third direction. A plurality of gear teeth are provided on the outer peripheral portion of the first agitator gear 44 at regular intervals over the entire circumference. As described above, at least some of the gear teeth of the small-diameter gear portion 432 and at least some of the gear teeth of the first agitator gear 44 mesh with each other. . The first agitator gear 44 is fixed to one end of the agitator shaft 21 in the third direction so as not to rotate relative to it. Therefore, when power is transmitted from the coupling 41 to the first agitator gear 44 via the idle gear 43 , the first agitator gear 44 rotates, and the agitator 20 rotates together with the first agitator gear 44 .

The first cover 45 is fixed to the first outer surface 11 of the casing 10, for example by screwing. Coupling gear 412 , developing gear 42 , idler gear 43 and first agitator gear 44 are housed between first outer surface 11 and first cover 45 . A fastening hole 413 of the coupling part 411 is exposed to the outside of the first cover 45 . The first cover 45 of this embodiment also serves as a holder cover that holds a holder 62 of an IC chip assembly 60, which will be described later. The structure of the first cover 45 as a holder cover will be described later.

The second gear portion 50 is positioned on the other side portion of the casing 10 in the third direction. That is, the second gear portion 50 is positioned on the second outer surface 12 . FIG. 5 is a perspective view of the developer cartridge 1 with the second gear portion 50 disassembled. As shown in FIG. 5 , the second gear section 50 has a second agitator gear 51 , a detection gear 52 , a conductive member 53 and a second cover 54 . 5, the gear teeth of the second agitator gear 51 and the detection gear 52 are omitted.

The second agitator gear 51 is a gear for transmitting the rotation of the agitator shaft 21 to the detection gear 52 . The second agitator gear 51 can rotate around a rotation axis extending in the third direction. A plurality of gear teeth are provided on the outer peripheral portion of the second agitator gear 51 at regular intervals over the entire circumference. At least some gear teeth among the plurality of gear teeth of the second agitator gear 51 and at least some gear teeth among the plurality of gear teeth of the detection gear 52 mesh with each other. Also, the second agitator gear 51 is fixed to the other end of the agitator shaft 21 in the third direction so as not to rotate relative to it. Therefore, when the agitator shaft 21 rotates, the second agitator gear 51 also rotates.

The detection gear 52 is a gear for transmitting information about the developing cartridge 1 to the image forming apparatus. The information on the development cartridge 1 includes, for example, information on whether the development cartridge 1 is a new (unused) development cartridge or a used development cartridge. Further, the information on the developing cartridge 1 includes, for example, specifications of the developing cartridge 1 . The specifications of the developing cartridge 1 include, for example, the number of prints (yield number) that can be printed by the developer contained in the developing cartridge 1 .

The detection gear 52 can rotate around a rotation axis extending in the third direction. The sensing gear 52 has a plurality of gear teeth on a portion of its outer circumference. When an unused developing cartridge 1 is attached to the drawer unit 90 and the drawer unit 90 is accommodated in the image forming apparatus, the detection gear 52 is rotated by meshing with the second agitator gear 51 . When the second agitator gear 51 and the detection gear 52 are disengaged, the detection gear 52 stops rotating.

On the other hand, when the used developing cartridge 1 is attached to the drawer unit 90 and the drawer unit 90 is accommodated in the image forming apparatus, the detection gear 52 and the second agitator gear 51 are disengaged. , the detection gear 52 does not rotate.

Another gear may be arranged between the second agitator gear 51 and the detection gear 52 . For example, the second gear portion 50 may have a second idle gear that meshes with both the second agitator gear 51 and the detection gear 52 . Then, the rotation of the second agitator gear 51 may be transmitted to the detection gear 52 via the second idle gear.

As shown in FIG. 5, the detection gear 52 has detection protrusions 521 . The detection protrusion 521 protrudes in the third direction. Also, the detection protrusion 521 extends in an arc shape around the rotation axis.

The conductive member 53 is a conductive member. As a material of the conductive member 53, a conductive metal or a conductive resin is used. A conductive member 53 is located on the second outer surface 12 of the casing 10 . The conductive member 53 has a gear shaft 531 protruding in the third direction. The detection gear 52 rotates around the gear shaft 531 while being supported by the gear shaft 531 . Also, the conductive member 53 has a bearing portion 532 . The bearing portion 532 contacts the roller shaft 32 of the developing roller 30 .

The drawer unit 90 has a conductive lever (not shown) that contacts the gear shaft 531 . When the lever contacts the gear shaft 531, the conductive member 53 and the roller shaft 32 are electrically connected to the lever. When the image forming apparatus is driven, electric power supplied from the lever maintains the roller shaft 32 at a predetermined bias voltage. However, the detection protrusion 521 partially covers the outer peripheral surface of the gear shaft 531 . Therefore, after a new developer cartridge 1 is inserted into the drawer unit 90 , the contact state between the lever and the gear shaft 531 changes according to the shape of the detection gear 52 while the detection gear 52 is rotating. By recognizing the change in the contact state, the image forming apparatus identifies whether or not the installed developing cartridge 1 is new and identifies the specifications of the developing cartridge 1 .

However, the method of detecting information from the detection gear 52 may not necessarily utilize the presence or absence of electrical continuity. For example, lever movement may be detected optically. Also, the position and length of the detection protrusion 521 in the circumferential direction may differ from those of the present embodiment. Also, the detection gear 52 may have a plurality of detection protrusions 521 . The shape of the detection gear 52 can be varied according to specifications such as the number of printable sheets of the developing cartridge 1 . Specifically, the number of detection protrusions 521, the interval in the circumferential direction of a plurality of detection protrusions 521, the length in the circumferential direction of each detection protrusion 521, the length in the radial direction of each detection protrusion 521, etc. can be differentiated. Thus, by providing variations in the number and position of the detection protrusions 521 in the circumferential direction, it is possible to indicate various specifications of the developing cartridge 1 to the image forming apparatus.

Also, the detection gear may be composed of a plurality of members. For example, the detection gear 52 and the detection protrusion 521 may be separate bodies. Further, the detection gear may have a detection gear main body and an auxiliary member whose position changes according to rotation of the detection gear main body. The auxiliary member may then change the position of the lever.

Also, the detection gear 52 may be a movable gear that can move in the third direction. The movable gear does not have to be a toothless gear. That is, the movable gear may have a plurality of gear teeth circumferentially on its outer peripheral surface. In this case, when the movable gear rotates, the movable gear moves in the third direction, thereby disengaging the movable gear and the second agitator gear 51 . Note that the movable gear may move away from the second outer surface 12 in the third direction. Also, the movable gear may move from the second outer surface 12 toward the third direction.

Alternatively, the detection gear 52 may have a cam, and the cam may contact the detection protrusion 521 . In this case, the cam rotates together with the rotation of the detection gear 52, and the rotation of the cam contacts the detection projection 521, causing the detection projection 521 to move. The sensing protrusion 521 may be rotatably mounted on a shaft provided on the second outer surface 12 or the second gear cover 54 . Alternatively, the shaft of the detection projection 521 may be inserted into a hole of the second outer surface 12 or the second gear cover 54 to hold the detection projection 521 rotatably.

Also, in this embodiment, the gear shaft 531 extends from the second outer surface 12 in the third direction. However, the gear shaft 531 does not have to be in direct contact with the second outer surface 12 . For example, the casing 10 may further include a through hole extending through the second outer surface 12 and a cap attached to the through hole, with the gear shaft extending from the cap in the third direction. In this case, for example, the cap has a gear shaft projecting in the third direction towards the detection gear 53 . The detection gear 53 rotates about the gear shaft 531 while being supported by the gear shaft.

The second cover 54 is fixed to the second outer surface 12 of the casing 10, for example by screwing. A second agitator gear 51 , a detection gear 52 and a conductive member 53 are housed between the second outer surface 12 and the second cover 54 . Also, the second cover 54 has an opening 541 . A portion of sensing gear 52 and a portion of gear shaft 531 are exposed through opening 541 . The lever mentioned above contacts the sensing gear 52 or the gear shaft 531 through the opening 541 .

<2. About IC chip assembly>
IC chip assembly 60 is disposed on first outer surface 11 of casing 10 . FIG. 6 is an exploded perspective view of the IC chip assembly 60. FIG. FIG. 7 is a cross-sectional view of the IC chip assembly 60 taken along a plane perpendicular to the third direction. As shown in FIGS. 2 to 7, the IC chip assembly 60 has an IC chip 61 that is a storage medium and a holder 62 that holds the IC chip 61 . The holder 62 is held by the first cover 45 on the side of the casing 10 in the third direction. Various information about the developing cartridge 1 is recorded in the IC chip 61 . IC chip 61 has an electrical contact surface 611 . The electrical contact surface 611 is made of metal, which is a conductor. The IC chip 61 is fixed to the outer surface of the holder 62 in the first direction.

The drawer unit 90 has electrical connectors. The electrical connector is made of metal, for example. When the developer cartridge 1 is attached to the drawer unit 90 , the electrical connector of the drawer unit 90 contacts the electrical contact surface 611 . As a result, the image forming apparatus can perform at least one of reading information from the IC chip 61 and writing information to the IC chip 61 .

At least part of the holder 62 is covered with the first cover 45 . The holder 62 has a boss 621a, a boss 621b, and a boss 621c. The bosses 621 a and 621 b each extend in the third direction from the surface of the holder 62 opposite to the surface facing the casing 10 toward the first cover 45 . Also, the bosses 621a and 621b are arranged in the second direction. On the other hand, as shown in FIGS. 2 and 4, the first cover 45 has through holes 451a and 451b. The through holes 451a and 451b each penetrate the first cover 45 in the third direction. Further, the through holes 451a and 451b are arranged in the second direction. The boss 621a is inserted into the through hole 451a. The boss 621b is inserted into the through hole 451b.

Boss 621c extends in the third direction from the surface of holder 62 facing casing 10 toward casing 10 . On the other hand, casing 10 has recess 15 . The recess 15 is recessed in the third direction on the first outer surface 11 of the casing 10 . Boss 621 c is inserted into recess 15 . The shape of each of the boss 621a, the boss 621b, and the boss 621c may be a cylinder or a prism.

The size (inner dimension) of the through hole 451a in the second direction is larger than the size (outer dimension) of the boss 621a in the second direction. The size (inner dimension) of the through hole 451b in the second direction is larger than the size (outer dimension) of the boss 621b in the second direction. The size (inner dimension) of the recess 15 in the second direction is larger than the size (outer dimension) of the boss 621c in the second direction. Therefore, the holder 62 can relatively move in the second direction with respect to the casing 10 and the first cover 45 together with the bosses 621a, 621b, and 621c. When the holder 62 moves in the second direction, the IC chip 61 having the electrical contact surface 611 also moves in the second direction together with the holder 62 .

The size (inner dimension) of the through hole 451a in the first direction is larger than the size (outer dimension) of the boss 621a in the first direction. The size (inner dimension) of the through hole 451b in the first direction is larger than the size (outer dimension) of the boss 621b in the first direction. The size (inner dimension) of the recess 15 in the first direction is larger than the size (outer dimension) of the boss 621c in the first direction. Therefore, the holder 62 can relatively move in the first direction with respect to the casing 10 and the first cover 45 together with the bosses 621a, 621b, and 621c. When the holder 62 moves in the first direction, the IC chip 61 having the electrical contact surface 611 also moves in the first direction together with the holder 62 . Also, the holder 62 may be movable in the third direction between the first cover 45 and the first outer surface 11 .

The number of bosses provided on the holder 62 may be one, or three or more. Also, the number of through-holes provided in the first cover 45 may be one, or three or more. Also, the first cover 45 may have recesses into which the bosses 621a and 621b are inserted instead of the through holes 451a and 451b.

As shown in FIGS. 6 and 7, holder 62 has a first end 710 and a second end 720 . The first end 710 is one end of the holder 62 in the first direction. Also, the second end 720 is the other end of the holder 62 in the first direction. First end 710 is movable in a first direction relative to second end 720 . More specifically, the holder 62 of this embodiment has a first holder member 71, a second holder member 72, and a coil spring 73 positioned therebetween. The first holder member 71 is made of resin, for example. The second holder member 72 is made of resin, for example. The first holder member 71 has a first end 710 . The IC chip 61 is fixed to a holding surface 620 included on the outer surface of the first end portion 710 . The second holder member 72 has a second end 720 . In the assembled holder 62, the first end 710 and the second end 720 are separated in the first direction.

The coil spring 73 is an elastic member extending in the first direction. Coil spring 73 is disposed between first end 710 and second end 720 in the first direction. The coil spring 73 expands and contracts in the first direction at least between a first state and a second state that is more contracted than the first state. The length of the coil spring 73 in the first direction in the first state is longer than the length in the first direction of the coil spring 73 in the second state. Therefore, the distance in the first direction between the first end 710 and the second end 720 in the first state is equal to the distance in the first direction between the first end 710 and the second end 720 in the second state longer than the distance of Moreover, the length of the coil spring 73 in the first direction at least in the second state is shorter than the natural length of the coil spring 73 .

Further, as shown in FIGS. 6 and 7, the first holder member 71 has a claw portion 714a and a claw portion 714b. The claw portion 714a and the claw portion 714b each protrude from the first holder member 71 in a direction intersecting the first direction. On the other hand, the second holder member 72 has openings 721a and 721b. The claw portion 714a is inserted into the opening 721a. The claw portion 714b is inserted into the opening 721b. In the first state, the claw portion 714a contacts the second holder member 72 at the edge of the opening 721a on the first end portion 710 side. Further, in the first state, the claw portion 714b contacts the second holder member 72 at the edge of the opening 721b on the first end portion 710 side. This prevents the length of the coil spring 73 in the first direction from becoming longer than in the first state. Also, the first holder member 71 is prevented from being removed from the second holder member 72 . On the other hand, in the second state, the claw portions 714 a and 714 b are separated from the second holder member 72 .

In addition, instead of the opening, a concave portion or a step that can come into contact with the claw portion may be provided. Alternatively, the first holder member 71 may be provided with an opening, a concave portion, or a step, and the second holder member 72 may be provided with a claw portion.

The holding surface 620 of the holder 62 can move in the first direction with respect to the casing 10 due to the dimensional difference between the through hole 451 and the boss 621 and the expansion and contraction of the coil spring 73 . Hereinafter, the position of the holding surface 620 in the first direction with respect to the casing 10 before the developer cartridge 1 is attached to the drawer unit 90 is referred to as "initial position" (first position). Further, when the developing cartridge 1 is attached to the drawer unit 90, the position of the holding surface 620 in the first direction with respect to the casing 10 at the moment when the coil spring 73 contracts the most is referred to as an "intermediate position" (second position). . Further, the position of the holding surface 620 in the first direction with respect to the casing 10 when the electrical contact surface 611 comes into contact with the electrical connector 913, which will be described later, is called a "contact position" (third position). The position of the holding surface 620 in the first direction with respect to the casing 10 after the developer cartridge 1 is completely attached to the drawer unit 90 is called a "final position" (fourth position).

In addition to the holding surface 620 described above, the outer surface of the first end portion 710 includes a first guide surface 711 (first surface), a second guide surface 712 (second surface), and third guide surfaces 713a, 713a, and 713b. 713b (third surface).

The first guide surface 711 is provided on the side portion closer to the developing roller 30 among both side portions of the holding surface 620 in the second direction. The first guide surface 711 is inclined with respect to the electrical contact surface 611 of the IC chip 61 held by the holding surface 620 . Specifically, the first guide surface 711 is inclined at an acute angle with respect to the electrical contact surface 611 .

Here, one end portion of the first end portion 710 in the second direction is defined as a first outer end position (third position) 711a. One end of the holding surface 620 in the second direction is defined as a first inner end position (fourth position) 711b. As shown in FIG. 7, the first guide surface 711 extends from a first outer end position 711a toward the electrical contact surface 611 to a first inner end position 711b. In both the second direction and the first direction, the first outer end position 711a is farther from the electrical contact surface 611 than the first inner end position 711b. Also, as shown in FIG. 7, the distance d1 in the first direction between the first outer end position 711a and the first inner end position 711b is the distance between the electrical contact surface 611 and the first inner end position 711b. greater than the distance d2 in the first direction.

The second guide surface 712 is provided on the side far from the developing roller 30 among both side portions of the holding surface 620 in the second direction. The second guide surface 712 is inclined with respect to the electrical contact surface 611 of the IC chip 61 held by the holding surface 620 . Specifically, the second guide surface 712 is inclined at an acute angle with respect to the electrical contact surface 611 .

Here, the other end portion of the first end portion 710 in the second direction is defined as a second outer end position (fifth position) 712a. The other end of the holding surface 620 in the second direction is defined as a second inner end position (sixth position) 712b. As shown in FIG. 7, the second guide surface 712 extends from a second outer end position 712a toward the electrical contact surface 611 to a second inner end position 712b. The second outer end position 712a is farther from the electrical contact surface 611 than the second inner end position 712b in both the second direction and the first direction. Also, as shown in FIG. 7, the distance d3 in the first direction between the second outer end position 712a and the second inner end position 712b is the distance between the electrical contact surface 611 and the second inner end position 712b. greater than the distance d4 in the first direction.

The third guide surface 713a is provided on one of both sides of the electrical contact surface 611 in the third direction. The third guide surface 713b is provided on the other of both sides of the electrical contact surface 611 in the third direction. The third guide surface 713a and the third guide surface 713b each extend in the second direction. Further, each of the third guide surfaces 713 a and 713 b is farther from the coil spring 73 than the electrical contact surface 611 with respect to the first direction. Therefore, the electrical contact surface 611 is arranged at a position recessed toward the coil spring 73 from the third guide surface 713a and the third guide surface 713b.

The first guide surface 711, the second guide surface 712, and the third guide surfaces 713a and 713b may be planar or curved. However, the first guide surface 711, the second guide surface 712, and the third guide surfaces 713a and 713b are smooth surfaces without steps so that the developing cartridge 1 is not caught when it is attached to the drawer unit 90. is preferably

<3. About the operation when wearing>
Next, the operation when the developer cartridge 1 is attached to the drawer unit 90 will be described. 8 to 14 are diagrams showing how the developing cartridge 1 is attached to one cartridge holding portion 91 of the drawer unit 90. FIG.

When the developing cartridge 1 is attached to the cartridge holding portion 91, first, the developing roller 30 of the developing cartridge 1 faces the insertion opening 910 of the cartridge holding portion 91 as shown in FIG. At this time, the first end 710 and the second end 720 of the holder 62 are not yet in contact with the drawer unit 90 . Therefore, the coil spring 73 is in the above-described first state. Moreover, the position of the holding surface 620 in the first direction with respect to the casing 10 is the initial position described above. The developing cartridge 1 is inserted in the second direction into the cartridge holding portion 91 as indicated by the dashed arrow in FIG.

The cartridge holding portion 91 has a first guide plate 911 and a second guide plate 912 . The first guide plate 911 and the second guide plate 912 are arranged facing each other with a gap in the first direction. The first guide plate 911 and the second guide plate 912 extend along the third direction and the second direction, respectively. The first guide plate 911 also has a metallic electrical connector 913 that can contact the electrical contact surface 611 of the IC chip 61 . The electrical connector 913 protrudes in the first direction from the surface of the first guide plate 911 toward the second guide plate 912 .

When the developing cartridge 1 is inserted into the cartridge holding portion 91, the first guide surface 711 of the holder 62 contacts the end of the first guide plate 911 in the second direction, as shown in FIG. As the first guide surface 711 is pushed by the first guide plate 911, the holder 62 moves in the first direction. Movement of the holder 62 at this time is relative movement with respect to the casing 10 . As a result, the holder 62 is positioned in the first direction between the first guide plate 911 and the second guide plate 912, as shown in FIG.

After that, the first end 710 of the first holder member 71 contacts the first guide plate 911 . Also, the second end 720 of the second holder member 72 contacts the second guide plate 912 . The coil spring 73 contracts more in the first direction than in the first state.

As shown in FIG. 11, the first guide plate 911 has guide protrusions 914 that protrude toward the second guide plate 912 . The guide projection 914 is located closer to the insertion opening 910 than the electrical connector 913 is. The guide protrusion 914 has a first inclined surface 915 . Also, the second guide plate 912 has a second inclined surface 916 . The distance between the first slanted surface 915 and the second slanted surface 916 in the first direction gradually decreases toward the insertion direction of the developing cartridge 1 .

When the developer cartridge 1 is further inserted in the second direction, the first holder member 71 contacts the first inclined surface 915 and the second holder member 72 contacts the second inclined surface 916 . As a result, the first holder member 71 and the second holder member 72 approach each other in the first direction, and the length of the coil spring 73 in the first direction gradually shortens. When the third guide surfaces 713a and 713b of the first holder member 71 come into contact with the top of the guide projection 914, the length of the coil spring 73 in the first direction becomes the shortest. That is, the coil spring 73 will be in the above-described second state. Moreover, the position of the holding surface 620 with respect to the casing 10 in the first direction is the intermediate position described above.

Thus, the IC chip assembly 60 can change the position of the holding surface 620 holding the IC chip 61 in the first direction when the developer cartridge 1 is inserted into the drawer unit 90 . Therefore, the developer cartridge 1 can be inserted while changing the position of the holding surface 620 in the first direction along the guide protrusion 914 . In addition, the pressure in the first direction applied from the guide protrusion 914 to the first holder member 71 is reduced compared to the case where the guide protrusion 914 is passed while the position of the holding surface 620 in the first direction is fixed. Therefore, the developer cartridge 1 can be inserted into the drawer unit 90 while suppressing the electrical contact surface 611 of the IC chip 61 from rubbing. 10, 11 and 12, the electrical contact surface 611 directly contacts the electrical connector 913 after the first surface 711 overcomes the guide protrusion 914. As shown in FIG. As a result, rubbing of the electrical connector 913 can also be reduced.

In particular, in the developer cartridge 1 of this embodiment, the electrical contact surface 611 of the IC chip 61 is arranged at a position recessed from the third guide surfaces 713a and 713b. Therefore, in the state of FIG. 11, the top of the guide projection 914 contacts only the third guide surfaces 713a and 713b and does not contact the electrical contact surface 11. As shown in FIG. Therefore, it is possible to avoid the guide projection 914 from rubbing against the electrical contact surface 611 .

After that, when the developer cartridge 1 is further inserted in the second direction, the third guide surfaces 713 a and 713 b pass through the guide projections 914 . Then, as shown in FIG. 12, the second guide surface 712 contacts the guide protrusion 914 . Along with this, the coil spring 73 expands again from the second state and enters the above-described third state. As a result, the electrical contact surface 611 of the IC chip 61 contacts the electrical connector 913 as shown in FIG. The length of the coil spring 73 in the first direction in the third state is shorter than the length of the coil spring 73 in the first state in the first direction and longer than the length in the first direction of the coil spring 73 in the second state. long. Also, the length of the coil spring 73 in the first direction in the third state is shorter than the natural length of the coil spring 73 . Moreover, the relative position of the holding surface 620 in the first direction with respect to the casing 10 is the above-described contact position.

Thereby, the IC chip assembly 60 is fixed while being sandwiched between the electrical connector 913 and the second guide plate 912 . After that, in the present embodiment, the casing 10 is tilted in the first direction as indicated by the dashed arrow in FIG. 14 . As a result, the developing roller 30 comes into contact with the photosensitive drum 92 of the drawer unit 90 . At this time, the position of the holding surface 620 with respect to the casing 10 in the first direction changes from the above-described contact position to the final position. Also, the boss 621 moves in the first direction within the through hole 451 . As a result, the boss 621 is out of contact with the edge forming the through hole 451 of the first cover 45 . As a result, the IC chip assembly 60 and the first cover 45 are out of contact. Therefore, vibration is less likely to be transmitted from the driving section such as the first gear section 40 to the IC chip assembly 60 during execution of print processing in the image forming apparatus. Thereby, the contact state between the electrical contact surface 611 and the electrical connector 913 can be better maintained.

<4. Separation operation>
After mounting the developing cartridge 1 , the drawer unit 90 can perform a so-called “separation operation” to temporarily separate the developing roller 30 from the photosensitive drum 92 . As shown in FIG. 2, the first cover 45 of the developer cartridge 1 has a first columnar projection 46 extending in the third direction. Further, as shown in FIG. 3, the second cover 54 of the developer cartridge 1 has a second columnar projection 55 extending in the third direction. On the other hand, as shown in FIG. 1, the drawer unit 9 has a plurality of pressing members 93. As shown in FIG. The pressing members 93 are provided on both sides of each cartridge holding portion 91 in the third direction.

14 described above, each of the first columnar projection 46 and the second columnar projection 55 is pressed by the pressing member 93. As shown in FIG. Thereby, the casing 10 is tilted in the first direction. As a result, the position of the holding surface 620 with respect to the casing 10 in the first direction changes from the above-described contact position to the final position.

FIG. 15 is a diagram showing a state when the separation motion is executed. During the separating operation, the positions of the first columnar projection 46 and the second columnar projection 55 are changed by the driving force from the image forming apparatus. Specifically, each of the first columnar projection 46 and the second columnar projection 55 is pushed by a lever (not shown) of the drawer unit 90 . As a result, each of the first columnar projection 46 and the second columnar projection 55 moves against the pressing force of the pressing member 93 . As a result, the casing 10 of the developing cartridge 1 and the developing roller 30 move in the second direction away from the photosensitive drum 92, as indicated by the dashed arrow in FIG.

At this time, the IC chip assembly 60 is fixed while being sandwiched between the electrical connector 913 and the second guide plate 912 . Therefore, the position of IC chip assembly 60 with respect to drawer unit 90 does not change even though casing 10 and developing roller 30 move in the second direction. Also, the state of the coil spring 73 remains unchanged in the third state. Therefore, the position of the holder 62 in the second direction with respect to the casing 10 changes from the standard position (first position) to the separated position (second position). Also, the boss 621 moves in the second direction inside the through hole 451 .

Thus, the developer cartridge 1 can change the position of the casing 10 in the second direction without changing the position of the electrical contact surface 611 with respect to the drawer unit 90 in the second direction. Therefore, the contact state between the electrical contact surface 611 and the electrical connector 913 can be maintained when performing the separating operation. Further, even when the image forming apparatus is transported with the developer cartridge 1 attached to the drawer unit 90, the contact state between the electrical contact surface 611 and the electrical connector 913 can be maintained. Rubbing of the contact surface 611 can be reduced.

<5. Variation>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. Various modifications will be described below, focusing on differences from the above-described embodiment.

<5-1. First modification>
FIG. 16 is a partially exploded perspective view of the developer cartridge 1A of the first modified example. In the example of FIG. 16, at least part of the holder 62A holding the IC chip 61A is covered with the first cover 45A, as in the above embodiment. However, in the example of FIG. 16, the first cover 45A has bosses 451aA and 451bA. Boss 451aA and boss 451bA are arranged in the second direction. Bosses 451aA and 451bA each extend in the third direction from first cover 45A toward casing 10A. On the other hand, the holder 62A has one through hole 621A penetrating in the third direction. Bosses 451aA and 451bA are both inserted into through hole 621A.

The size of the through hole 621A in the second direction is greater than the length between one edge of the boss 451aA in the second direction and the other edge of the boss 451bA in the second direction. That is, the size of the through-hole 621A in the second direction is greater than the distance in the second direction between the portions of the bosses 451aA and 451bA that are the furthest apart in the second direction. Therefore, the holder 62A can move in the second direction together with the through hole 621A with respect to the casing 10A and the first cover 45A. When the holder 62A moves in the second direction, the IC chip 61A having the electrical contact surface 611A also moves in the second direction together with the holder 62A.

Also, the size of the through hole 621A in the first direction is larger than the size of each of the bosses 451aA and 451bA in the first direction. Therefore, the holder 62A can move in the first direction together with the through hole 621A with respect to the casing 10A and the first cover 45A. When the holder 62A moves in the first direction, the IC chip 61A having the electrical contact surface 611A also moves in the first direction together with the holder 62A. The holder 62A may also be movable in the third direction between the first cover 45A and the first outer surface 11A.

Thus, by providing the first cover 45A with the boss 451A and providing the holder 62A with the through hole 621A, the electrical contact surface 611A may be moved in the first direction and the second direction with respect to the casing 10A. Even with this structure, when the casing 10A is tilted in the first direction when the developer cartridge 1A is attached to the drawer unit, the boss 451A can be moved in the first direction inside the through hole 621A. Further, when the separating operation is performed after the developing cartridge 1A is attached, the boss 451A can be moved in the second direction inside the through hole 621A. As a result, it is possible to change the position of the casing 10A while maintaining good contact between the electrical contact surface 611A and the electrical connector.

The number of bosses 451A provided on the first cover 45A may be one, or three or more. Also, the number of through holes 621A provided in the holder 62A may be two or more. Also, the holder 62A may have a recess into which the boss 451A is inserted instead of the through hole 621A. Alternatively, a boss may be provided on the first outer surface of the casing, and the boss of the casing may be inserted into a through-hole or recess of the holder. The boss 451A may be a cylinder or a prism.

FIG. 17 is a cross-sectional view of the IC chip assembly 60A of FIG. 16 taken along a plane perpendicular to the third direction. As shown in FIG. 17, the holder 62A of this IC chip assembly 60A has a holder member 74A made of resin and a leaf spring 75A fixed to the holder member 74A. The holder member 74A has a first end 740A, which is one end of the holder 62A in the first direction. The IC chip 61A is fixed to a holding surface 620A included in the outer surface of the first end portion 740A. The plate spring 75A has a second end 750A that is the other end in the first direction of the holder 62A. In the assembled holder 62A, the first end 740A and the second end 750A are separated in the first direction.

For the plate spring 75A, for example, a bent metal plate having flexibility is used. The leaf spring 75A expands and contracts in the first direction at least between a first state and a second state bent more than the first state. The length of the leaf spring 75A in the first direction in the first state is longer than the length in the first direction of the leaf spring 75A in the second state. Therefore, the distance in the first direction between the first end 740A and the second end 750A in the first state is equal to the distance in the first direction between the first end 740A and the second end 750A in the second state. longer than the distance of Moreover, the length of the leaf spring 75A in the first direction at least in the second state is shorter than the natural length of the leaf spring 75A.

Thus, by using the plate spring 75A instead of the coil spring, the IC chip assembly 60A may be expanded and contracted in the first direction. When the developer cartridge 1A is attached to the drawer unit, the electrical contact surface 611A of the IC chip 61A is pushed to the casing 10A by the dimensional difference between the boss 451A and the through hole 621A and the expansion and contraction of the plate spring 75A. Can be moved in one direction.

<5-2. Second modification>
FIG. 18 is a partial perspective view of the developer cartridge 1B of the second modification. In the example of FIG. 18, the electrical contact surface 611B of the IC chip 61B faces the third direction. Therefore, the first direction perpendicular to the electrical contact surface 611B and the third direction are the same. Also, in the example of FIG. 18, a columnar elastic body 63B is provided between the casing 10B and the IC chip assembly 60B. For example, a coil spring extending in the first direction is used for the columnar elastic body 63B. One end of the columnar elastic body 63B in the third direction is fixed to the holder 62B of the IC chip assembly 60B. The other end of the columnar elastic body 63B in the third direction is fixed to the first outer surface of the casing 10B. That is, the casing 10B and the IC chip assembly 60B are connected by the columnar elastic body 63B.

19 and 20 are diagrams showing movement of the IC chip assembly 60B due to deformation of the columnar elastic body 63B. As shown in FIG. 19, the columnar elastic body 63B can expand and contract in the first direction. When the columnar elastic body 63B expands and contracts, the position of the electrical contact surface 611B with respect to the casing 10B in the first direction also changes. Further, as shown in FIG. 20, the columnar elastic body 63B is deformable obliquely with respect to the first direction. When the columnar elastic body 63B obliquely deforms, the relative position between one end and the other end of the columnar elastic body 63B changes in a direction perpendicular to the first direction.

21 and 22 are diagrams showing how the developer cartridge 1B of the second modification is mounted in the drawer unit 90B. As shown in FIGS. 21 and 22, the first cover 45B has a first frame portion 456B and a second frame portion 457B spaced apart in the second direction. The IC chip assembly 60B and the columnar elastic body 63B are housed in the housing portion 452B, which is the space between the first frame portion 456B and the second frame portion 457B. Further, the first cover 45B has a claw portion 453B projecting from the first frame portion 456B toward the housing portion 452B. Before the developer cartridge 1B is attached to the drawer unit 90B, a portion of the IC chip assembly 60 contacts the claw portion 453B as shown in FIG. As a result, the columnar elastic body 63B is kept compressed in the first direction from its natural length.

When the developer cartridge 1B is attached to the drawer unit 90B, as shown in FIG. 22, the electrical contact surface 611B of the IC chip 61B contacts the electrical connector 913B. At this time, the length of the columnar elastic body 63B in the first direction becomes shorter than in the state of FIG. Therefore, the contact state between the electrical contact surface 611B and the electrical connector 913B is maintained by the repulsive force of the columnar elastic body 63B.

23A and 23B are diagrams showing a state when the separating operation is executed after the developing cartridge 1B is installed. During the separating operation, as shown in FIG. 23, the columnar elastic body 63B is obliquely deformed with respect to the first direction. As a result, the IC chip assembly 60B connected to one end of the columnar elastic body 63B and the casing 10B connected to the other end of the columnar elastic body 63B relatively move in the second direction. Therefore, the position of the casing 10B in the second direction can be changed without changing the position of the electrical contact surface 611B with respect to the drawer unit 90B in the second direction. That is, the separating operation can be performed while maintaining the contact state between the electrical contact surface 611B and the electrical connector 913B.

<5-3. Third modification>
FIG. 24 is a perspective view of a developer cartridge 1C of a third modified example. In the example of FIG. 24, IC chip assembly 60C has IC chip 61C, holder 62C, shaft portion 66C, and lever 67C. The shaft portion 66C extends in the second direction inside the first cover 45C. One end of the shaft portion 66C in the second direction is connected to the holder 62C so as not to relatively rotate. The other end of the shaft portion 66C in the second direction is connected to a lever 67C arranged outside the first cover 45C so as to be relatively non-rotatable. Therefore, when the lever 67C is rotated about the shaft portion 66C as indicated by the dashed arrow in FIG. 24, the shaft portion 66C and the holder 62C are also rotated about the shaft portion 66C. This changes the position of the holder 62C in the first direction.

25 to 27 are views of the developing cartridge 1C of the third modification as viewed from one side in the third direction. Before the developing cartridge 1C is attached to the drawer unit, the IC chip 61C and the holder 62C are accommodated inside the first cover 45C as shown in FIGS. When the developer cartridge 1C is attached to the drawer unit and the drawer unit is accommodated in the image forming apparatus, the lever 67C rotates about the shaft portion 66C. As a result, a portion of the holder 62C and the IC chip 61C protrude from the first cover 45C. Then, as shown in FIG. 27, the electrical contact surface 611C of the IC chip 61C contacts the electrical connector 913C provided on the drawer unit.

The lever 67C may be operated manually by the user after the developer cartridge 1C is attached to the drawer unit. Further, when the drawer unit is housed in the main body of the image forming apparatus, the lever 67C may be rotated by a guide surface provided on the main body of the image forming apparatus.

The first cover 45C has a support surface 454C that contacts the lever 67C before rotation. In the state of FIG. 25, one surface of the lever 67C in the second direction contacts the support surface 454C. Thereby, the lever 67C, the shaft portion 66C, the holder 62C, and the IC chip 61C are all supported in the second direction by the first cover 45C. However, as shown in FIG. 26, when lever 67C is rotated, lever 67C moves out of support surface 454C. Therefore, one surface of the lever 67C in the second direction and the support surface 454C are out of contact. Furthermore, the holder 62C is fixed at the position shown in FIG. 26 by the positioning member of the drawer unit. As a result, the electrical contact surface 611C of the IC chip 61C and the electrical connector 913C are kept in contact with each other.

In addition, in the state of FIG. 26, one surface of the holder 62C in the second direction is also out of contact with the first cover 45C. Therefore, the entire lever 67C, shaft portion 66C, holder 62C, and IC chip 61C can be moved relative to the first cover 45C in the second direction. Therefore, when the developing cartridge 1C is separated, the casing 10C and the first cover 45C are moved in the second direction while maintaining the contact state between the electrical contact surface 611C of the IC chip 61C and the electrical connector 913C, as shown in FIG. can be moved.

<5-4. Fourth modification>
FIG. 28 is an exploded perspective view of the first cover 45D and the IC chip assembly 60D of the developer cartridge of the fourth modification. FIG. 29 is a cross-sectional view of first cover 45D and IC chip assembly 60D. In the examples of FIGS. 28 and 29, the electrical contact surface 611D of the IC chip 61D faces the third direction. Therefore, the first direction perpendicular to the electrical contact surface 611D and the third direction are the same.

As shown in FIGS. 28 and 29, an IC chip assembly 60D of the fourth modification has an IC chip 61D, a holder 62D holding the IC chip 61D, and a joint member 63D. The holder 62D has a plurality of claws 622D extending along the first direction to the side opposite to the electrical contact surface 611D. In the example of FIG. 28, the holder 62D has four claw portions 622D. The joint member 63D has a fixing portion 631D fixed to the first cover 45D and an arm 632D extending in the first direction from the fixing portion 631D toward the holder 62D.

A spherical portion 633D having a diameter larger than the thickness of the arm 632D is provided at the tip of the arm 632D in the first direction. The spherical portion 633D is held at a position inside the holder 62D by a plurality of claw portions 622D. Thereby, as shown in FIG. 30, the arm 632D and the holder 62D are connected so as to be relatively rotatable with each other. That is, the IC chip 61D and the holder 62D can rotate relative to each other around the spherical portion 633D. Thereby, the position of the electrical contact surface 611D of the IC chip 61D with respect to the fixed portion 631D can be moved in the second direction. Therefore, when the developing cartridge is separated, the casing and first cover 45D can be moved in the second direction while maintaining the contact state between the electrical contact surface 611D of the IC chip 61D and the electrical connector.

28 to 30, the claw portion 622D of the holder 62D and the arm 632D of the joint member 63D are relatively movable in the first direction. Therefore, when inserting the developer cartridge into the drawer unit, the IC chip 61D and the holder 62D can be moved in the first direction with respect to the fixed portion 631D. Thereby, the developer cartridge can be inserted while suppressing the electrical contact surface 611D of the IC chip 61D from being rubbed.

An elastic member such as a coil spring that expands and contracts in the first direction may be interposed between the fixing portion 631D of the joint member 63D and the claw portion 622D. Also, an elastic member such as a coil spring that expands and contracts in the first direction may be interposed between the first cover 45D and the claw portion 622D. By doing so, the electrical contact surface 611D can be brought into better contact with the electrical connector by the repulsive force of the elastic member.

Alternatively, the arm 632D may be rotatably connected to the fixed portion 631D or the first cover 45D. For example, a spherical portion may be provided at both ends of the arm 632D, and one spherical portion may be rotatably held by a plurality of claw portions provided on the first cover 45D. By rotatably connecting both ends of the arm 632D in this manner, the position of the electrical contact surface 611D in the second direction can be changed more flexibly.

<5-5. Fifth modification>
FIG. 31 is a partial perspective view of a developer cartridge 1E of the fifth modification. In the example of FIG. 31, a holder 62E that holds an IC chip 61E is formed of a plate-like member that extends annularly and whose ends are connected to each other. Flexible resin, for example, is used as the material of the holder 62E. Therefore, in the example of FIG. 31, the holder 62E itself becomes an elastic body that can expand and contract in the first direction. In this way, the distance between both ends of the holder 62E in the first direction can be changed. Therefore, it is possible to prevent the electrical contact surface 611E of the IC chip 61E from rubbing when the developer cartridge 1E is inserted into the drawer unit.

Note that, in the example of FIG. 31, the holder 62E does not need to be composed of a plurality of members for the expansion and contraction of the holder 62E in the first direction. Moreover, it is not necessary to use an elastic member for the holder 62E, apart from the member for holding the IC chip 61E.

FIG. 32 is an exploded perspective view of the first cover 45E and IC chip assembly 60E of the fifth modification. As shown in FIG. 32, the first cover 45E has a boss 451aE extending in the first direction and a boss 451bE extending in the first direction. The bosses 451aE and 451bE are arranged in the second direction. In addition, the first cover 45E further has a connecting portion 455E that connects the tips of the bosses 451aE and 451bE.

The holder 62E extends annularly around the bosses 451aE and 451bE. Claw portions 623E provided at both ends of the holder 62E are engaged with each other. Thereby, a through hole 621E penetrating in the first direction is formed inside the holder 62E. A boss 451aE and a boss 451bE are located inside the through hole 621E. Moreover, the holder 62E further has a plate-like portion 624E projecting from its inner peripheral surface toward the through hole 621E. The plate-like portion 624E is inserted between the bosses 451aE and 451bE.

The distance between the bosses 451aE and 451bE in the second direction is greater than the thickness of the plate-like portion 624E in the second direction. Therefore, the holder 62E can relatively move in the second direction together with the plate-like portion 624E with respect to the casing 10E and the first cover 45E. When the holder 62E moves in the second direction, the IC chip 61E having the electrical contact surface 611E also moves in the second direction together with the holder 62E.

Also, the size of the through-hole 621E in the first direction is larger than the size of each of the bosses 451aE and 451bE in the first direction. Therefore, the holder 62E can move in the first direction with respect to the casing 10E and the first cover 45E. When the holder 62E moves in the first direction, the IC chip 61E having the electrical contact surface 611E also moves in the first direction together with the holder 62E.

When the developer cartridge 1E is attached to the drawer unit, the holder 62E contracts in the first direction by being sandwiched between the guide plates of the drawer unit. Specifically, when the claw portions 623E provided at both ends of the holder 62E approach each other, an urging force is generated in the direction in which the claw portions 623E move away from each other. With the holder 62E elastically deformed, the electrical contact surface 611E of the IC chip 61E comes into contact with the electrical connector. The biasing force fixes the electrical contact surface 611E and the electrical connector in contact with each other. Further, during the separating operation, the casing 10E moves in the second direction while the electrical contact surface 611E and the electrical connector are kept in contact.

Even with this structure, when the casing 10E is tilted in the first direction when the developing cartridge 1E is attached to the drawer unit, the bosses 451aE and 451bE can be moved in the first direction inside the through hole 621E. . Further, when the separation operation is executed after the developing cartridge 1E is attached, the bosses 451aE and 451bE can be moved in the second direction inside the through hole 621E. As a result, it is possible to change the position of the casing 10E while maintaining good contact between the electrical contact surface 611E and the electrical connector.

The number of bosses provided on the first cover 45E may be one, or three or more.

<5-6. Sixth modification>
FIG. 33 is a perspective view of the developer cartridge 1F and the drum cartridge 80F of the sixth modification. The developing cartridge 1F of FIG. 33 includes a casing 10F, a developing roller 30F, an IC chip assembly 60F, and a first cover 45F. In the example of FIG. 33, the developer cartridge 1F is attached to the drum cartridge 80F instead of the drawer unit. The drum cartridge 80F has one developer cartridge holding portion 81F that holds one developer cartridge 1F. A photosensitive drum 82F is provided in the developing cartridge holding portion 81F. When the developing cartridge 1F is attached to the drum cartridge 80F, the developing roller 30F of the developing cartridge 1F contacts the photosensitive drum 82F.

FIG. 34 is a diagram showing how the drum cartridge 80F, to which the developing cartridge 1F is attached, is attached to the image forming apparatus 100F. As shown in FIG. 34, the drum cartridge 80F to which the developing cartridge 1F is attached is attached to the drum cartridge holding portion 101F provided in the image forming apparatus 100F.

In this way, the same structure as the IC chip assembly in the above-described embodiment or the first to fifth modifications can be adopted for the developing cartridge 1F of the type mounted on the drum cartridge 80F. FIG. 35 is an exploded perspective view of the vicinity of the IC chip assembly 60F of the developing cartridge 1F. As shown in FIG. 35, the IC chip assembly 60F of the developer cartridge 1F has an IC chip 61F, which is a storage medium, and a holder 62F that holds the IC chip 61F. The holder 62F is held by the first cover 45F on the side of the casing 10F in the third direction.

The holder 62F has a first holder member 71F, a second holder member 72F, and a coil spring 73F. The coil spring 73F is an elastic member that expands and contracts in the first direction.

The first holder member 71F has a boss 621aF, a boss 621bF, and a boss 621cF. The boss 621aF extends in the third direction from the surface of the first holder member 71F facing the first cover 45F toward the first cover 45F. On the other hand, the first cover 45F has a through hole 451F. The through hole 451F penetrates the first cover 45F in the third direction. The boss 621aF is inserted into the through hole 451aF.

The bosses 621bF and 621cF each extend in the third direction from the surface of the first holder member 71 facing the casing 10F toward the casing 10F. On the other hand, the casing 10F has recesses 15aF and 15bF. The recess 15aF and the recess 15bF are each recessed in the third direction on the first outer surface 11F of the casing 10F. Boss 621bF is inserted into recess 15aF. Boss 621cF is inserted into recess 15bF.

The size (inner dimension) of the through hole 451F in the second direction is larger than the size (outer dimension) of the boss 621aF in the second direction. The size (inner dimension) of the recess 15aF in the second direction is larger than the size (outer dimension) of the boss 621bF in the second direction. The size (inner dimension) of the recess 15bF in the second direction is larger than the size (outer dimension) of the boss 621cF in the second direction. Therefore, the holder 62F can relatively move in the second direction with respect to the casing 10F and the first cover 45F together with the bosses 621aF, 621bF, and 621cF. When the holder 62F moves in the second direction, the IC chip 61F having the electrical contact surface 611F also moves in the second direction together with the holder 62F.

The size (inner dimension) of the through hole 451F in the first direction is larger than the size (outer dimension) of the boss 621aF in the first direction. The size (inner dimension) of the recess 15aF in the first direction is larger than the size (outer dimension) of the boss 621bF in the first direction. The size (inner dimension) of the recess 15bF in the first direction is larger than the size (outer dimension) of the boss 621cF in the first direction. Therefore, the holder 62F can relatively move in the first direction with respect to the casing 10F and the first cover 45F together with the bosses 621aF, 621bF, and 621cF. When the holder 62F moves in the first direction, the IC chip 61F having the electrical contact surface 611F also moves in the first direction together with the holder 62F.

Also, as shown in FIG. 34, the second holder member 72 has a recess 625F. On the other hand, the drum cartridge 80F has a convex portion 83F. The depression 625F and the protrusion 83F face each other in the first direction. The size of the depression 625F gradually expands with increasing distance from the IC chip 61F in the first direction. Also, the size of the protrusion 83F gradually converges toward the tip in the first direction.

As shown in FIG. 34, the image forming apparatus 100F has an electrical connector 102F. When the drum cartridge 80F with the developing cartridge 1F mounted thereon is inserted into the image forming apparatus 100F, the first holder member 71F comes into contact with the members of the image forming apparatus 100F. Also, the projection 83F of the drum cartridge 80F is fitted into the recess 625F of the second holder member 72F. This fixes the position of the second holder member 72F with respect to the drum cartridge 80F. As a result, the holder 62F is sandwiched between the members of the image forming apparatus 100F and the drum cartridge 80, so that the coil spring 73F contracts in the first direction. Further, when the drum cartridge F is further inserted into the image forming apparatus 100F, the electrical contact surface 611F of the IC chip 61F comes into contact with the electrical connector 102F.

The IC chip 61F contacts the electrical connector 102F while receiving the repulsive force of the coil spring 73F. The holder 62F is sandwiched between the electrical connector 102F and the projection 83F. Thereby, the holder 62F is positioned with respect to the image forming apparatus 100F and the drum cartridge 80F.

Further, as shown in FIG. 35, the second holder member 72F has claw portions 714F. The claw portion 714F protrudes from the second holder member 72F in a direction intersecting the first direction. In the example of FIG. 35, the claw portion 714F protrudes in the third direction from the second holder member 72F. On the other hand, the first holder member 71F has an opening 721F. The claw portion 714F is inserted into the opening 721F. This prevents the first holder member 71F from being removed from the second holder 72F.

Further, the casing 10F of the developer cartridge 1F has a first rib 46F and a second rib 55F. The first rib 46F protrudes in the third direction from the first outer surface 11F. The second rib 55F protrudes in the third direction from the second outer surface 12F. On the other hand, this drum cartridge 80F has a first lever 84F and a second lever 85F. During the separating operation, the driving force from the image forming apparatus operates the first lever 84F and the second lever 85F. Then, the first rib 46F is pushed by the first lever 84F. Also, the second rib 55F is pushed by the second lever 85F. This changes the positions of the first rib 46F and the second rib 55F. As a result, the casing 10 of the developing cartridge 1 and the developing roller 30 move in the second direction away from the photosensitive drum 92 .

As described above, the developer cartridge 1F can also change the position of the holder 62F in the second direction with respect to the casing 10F. Therefore, the position of the casing 10F in the second direction can be changed without changing the position of the electrical contact surface 611F with respect to the electrical connector 102F in the second direction. Therefore, the separating operation can be performed while maintaining the contact state between the electrical contact surface 611F and the electrical connector 102F. As a result, rubbing of the electrical contact surface 611F can be reduced.

Also in this developing cartridge 1F, the electrical contact surface 611F can move in the first direction with respect to the casing 10F. Therefore, when the drum cartridge 80F is attached to the image forming apparatus 100F, it is possible to suppress the electrical contact surface 611F from rubbing.

<5-7. Other Modifications>
In the above embodiments, an IC chip having an electrical contact surface was fixed to the outer surface of the holder. However, only the electrical contact surface that contacts the electrical connector may be fixed to the outer surface of the holder, and the portions other than the electrical contact surface of the IC chip may be arranged at other locations in the developer cartridge.

Further, in the above embodiment, the plurality of gears in the first gear portion and the second gear portion are engaged with each other by meshing gear teeth. However, the gears in the first gear section and the second gear section may engage each other by frictional force. For example, instead of a plurality of gear teeth, a friction member (eg, rubber) may be provided on the outer periphery of two gears that engage with each other.

Further, the developer cartridge 1 of the above-described embodiment is attached to the drawer unit of the image forming apparatus. However, the developing cartridge of the present invention may be attached to the main body of an image forming apparatus that does not have a drawer unit.

Further, the detailed shape of the developing cartridge may be different from the shape shown in each drawing of the present application. Also, the elements appearing in the above embodiments and modifications may be appropriately combined as long as there is no contradiction.

Reference Signs List 1, 1A, 1B, 1C, 1E, 1F developer cartridge 10, 10A, 10B, 10C, 10E, 10F casing 11 first outer surface 12 second outer surface 13 developer chamber 14 opening 20 agitator 21 agitator shaft 22 stirring blade 30, 30F developing roller 31 roller body 32 roller shaft 40 first gear portion 41 coupling 42 developing gear 43 idle gear 44 first agitator gear 45, 45A, 45B, 45C, 45D, 45E, 45F first cover 50 second gear Part 51 Second agitator gear 52 Detection gear 53 Conductive member 54 Second cover 60, 60A, 60B, 60C, 60D, 60E, 60F IC chip assembly 61, 61A, 61B, 61C, 61D, 61E, 61F IC chip 62, 62A , 62B, 62C, 62D, 62E, 62F holder 63B columnar elastic body 63D joint member 66C shaft portion 67C lever 71, 71F first holder member 72, 72F second holder member 73, 73F coil spring 74A holder member 75A leaf spring 80F drum Cartridge 81F Development cartridge holding portion 82F Photosensitive drum 90, 90B Drawer unit 91 Cartridge holding portion 92 Photosensitive drum 100F Image forming apparatus 101F Drum cartridge holding portion 102F Electric connector 451, 451F Through hole 451aA, 451bA, 451aE, 451bE Boss 611, 611A, 611B, 611C, 611D, 611E, 611F Electrical contact surface 620, 620A Holding surface 621, 621F Boss 621A, 621E Through hole 631D Fixing part 632D Arm 633D Spherical part 710, 740A First end 711 First guide surface 712 Second Guide surface 713a, 713b Third guide surface 720, 750A Second end 910 Insertion opening 911 First guide plate 912 Second guide plate 913, 913B, 913C Electric connector 914 Guide projection

Claims (10)

a housing that accommodates a developer therein;
a storage medium having an electrical contact surface;
an elastic member extending in a first direction intersecting the electrical contact surface, the elastic member being stretchable in the first direction between a first state and a second state;
a developing roller located on one side of the housing in the second direction, the developing roller being rotatable about a shaft extending in a third direction different from the first direction and the second direction;
A holder having the electrical contact surface positioned on the outer surface in the first direction, wherein the position of the outer surface relative to the housing is movable in the first direction between a first position and a second position. holder and
with
the length of the elastic member in the first direction in the first state is longer than the length of the elastic member in the first direction in the second state;
when the elastic member is in the first state, the holder is positioned at the first position;
The developer cartridge, wherein the holder is positioned at the second position when the elastic member is in the second state. The developer cartridge according to claim 1,
The developer cartridge, wherein the first direction is perpendicular to the electrical contact surface. The developer cartridge according to claim 1 or 2 ,
A developer cartridge, wherein the holder is movable together with the storage medium. The developer cartridge according to any one of claims 1 to 3 ,
The developer cartridge, wherein the holder holds the electrical contact surface on the outer surface. The developer cartridge according to any one of claims 1 to 4 ,
The developer cartridge, wherein the storage medium is positioned on the outer surface of the holder. The developer cartridge according to claim 5 ,
The developer cartridge, wherein the holder holds the storage medium on the outer surface. The developer cartridge according to any one of claims 1 to 6 ,
The developer cartridge, wherein the holder is positioned on a side portion of the housing. The developer cartridge according to any one of claims 1 to 7 ,
The developer cartridge, wherein the elastic member is a spring. The developer cartridge according to claim 8 ,
The developer cartridge, wherein the spring is a coil spring. The developer cartridge according to any one of claims 5 and 6 ,
The developer cartridge, wherein the storage medium has the electrical contact surface.

Images