Developing cartridge

Abstract

This developing cartridge (1) is a housing capable of accommodating a developer and has a housing (10) extending in a first direction. Additionally, this developing cartridge (1) has a coupling (41) located on one side of the housing (10) in the first direction, a detection gear (52) located on the other side of the housing (10) in the first direction, and a memory medium (61) having an electrical contact surface (611) located on one side of the housing (10) in the first direction. The detection gear (52) is rotatable about a rotation axis (85) extending in the first direction. The coupling (41) is rotatable about a rotation axis (83) extending in the first direction. By positioning the detection gear (52), the coupling (41), and the electrical contact surface (611) on the opposite side of the first direction of the housing (10), the first direction end surface of the housing (10) can be made smaller.

Description

Technology Field

[0001] The present invention relates to a developing cartridge. Background Technology

[0002] Conventionally, a developing cartridge that is detachable from an image forming device, such as a laser printer, is known. A conventional developing cartridge is described, for example, in Patent Document 1. The developing cartridge contains toner, which is a developing agent. Such a developing cartridge has an electrode that receives power from the image forming device. The electrode supplies the power received from the image forming device to a developing roller. In addition, the developing cartridge has a coupling. The coupling receives driving force from the image forming device. Furthermore, the developing cartridge described in Patent Document 1 has a detection gear. The detection gear is a gear for conveying to the image forming device whether the developing cartridge is new or not, or the specifications of the developing cartridge. After the developing cartridge is mounted on the image forming device, when the coupling receives driving force from the image forming device, the detection gear rotates.

[0003] In addition, the developing cartridge described in Patent Document 2 has a storage medium. The storage medium can record information such as the number of prints, for example. In the developing cartridge described in Patent Document 2, the cartridge-side contact portion of an IC (Integrated Circuit) chip is installed at the contact portion of a detection gear. Prior art literature

[0004] Japanese Patent Publication No. 2013-54056 and Japanese Patent Publication No. 2008-242085 The problem to be solved

[0005] In the developing cartridge described in Patent Document 2, a coupling, a detection gear, and an IC chip are located on a first side of the housing of the developing cartridge. In this case, since many components are arranged on the first side, the first side becomes larger. That is, the developing cartridge becomes larger. Meanwhile, on the inner surface of the image forming device corresponding to the first side of the developing cartridge, a driving member that sends driving force to the coupling, an actuator that detects the detection gear, and a contact part that reads information from the IC chip are installed. Because of this, the inner surface of the image forming device corresponding to the first side has a complex configuration, and there is a possibility that the image forming device will become larger.

[0006] The object of the present invention is to provide a structure in which the electrical contact surfaces of a coupling, a detection gear, and a memory medium are appropriately arranged in a developing cartridge in order to miniaturize an image forming device. means of solving the problem

[0007] To solve the above problem, the first invention of the present invention is a developing cartridge characterized by comprising: a housing capable of accommodating a developer, a housing extending in a first direction; a coupling located on one side of the housing in the first direction, a coupling rotatable about a first axis extending in the first direction; a detection gear located on the other side of the housing in the first direction, a detection gear rotatable about a second axis extending in the first direction; and a storage medium having an electrical contact surface, wherein the electrical contact surface is located on one side of the housing in the first direction.

[0008] The second invention of the present invention is a developing cartridge of the first invention, and the memory medium is characterized by being located on one side of the housing in the first direction.

[0009] The third invention of the present invention is a developing cartridge of the first or second invention, and the detection gear is characterized by being rotatable according to the rotation of the coupling.

[0010] The fourth invention of the present invention is a developing cartridge of the third invention, and further comprises a first shaft extending in the first direction and a first shaft rotatable according to the rotation of the coupling, and the detection gear is rotatable according to the rotation of the first shaft.

[0011] The fifth invention of the present invention is a developing cartridge of the fourth invention, an agitator comprising the first shaft, and further comprises an agitator rotatable together with the first shaft according to the rotation of the coupling, and the detection gear is rotatable according to the rotation of the agitator.

[0012] The sixth invention of the present invention is a developing cartridge of the fifth invention, wherein the detection gear is located on one side of the first shaft in a second direction perpendicular to the first direction, and the coupling is located on one side of the first shaft in the second direction.

[0013] The seventh invention of the present invention is a developing cartridge of the fifth or sixth invention, wherein the coupling comprises a coupling gear rotatable together with the coupling, and the agitator comprises a first agitator gear mounted on the first shaft, and further comprises a first agitator gear located on one side of the housing in the first direction and rotatable together with the first shaft, and is characterized in that the coupling gear and the first agitator gear mesh.

[0014] The eighth invention of the present invention is a developing cartridge of the fifth or sixth invention, further comprising a first idler gear located on one side of the housing in the first direction, wherein the coupling includes a coupling gear that is rotatable together with the coupling and meshes with the first idler gear, and wherein the agitator is a first agitator gear mounted on the first shaft, and further comprises a first agitator gear located on one side of the housing in the first direction, rotatable together with the first shaft, and meshes with the first idler gear.

[0015] The ninth invention of the present invention is a developing cartridge of any one of the fifth to eighth inventions, wherein the agitator is a second agitator gear mounted on the first shaft, and further comprises a second agitator gear located on the other side of the housing in the first direction and rotatable together with the first shaft, and is characterized in that the second agitator gear and the detection gear mesh.

[0016] The 10th invention of the present invention is a developing cartridge of any one of the 5th to 8th inventions, further comprising a second idler gear located on the other side of the housing in the first direction and meshing with the detection gear, and the agitator is a second agitator gear mounted on the first shaft, and further comprises a second agitator gear located on the other side of the housing in the first direction, rotatable together with the first shaft, and meshing with the second idler gear.

[0017] The 11th invention of the present invention is a developing cartridge described in any one of the 1st to 10th inventions, a developing roller rotatable about a rotation axis extending in the first direction, a developing roller having a roller shaft extending in the first direction, and further comprises an electrode electrically connected to the roller shaft, wherein the electrode is located on the other side of the housing in the first direction.

[0018] The 12th invention of the present invention is a developing cartridge of the 11th invention, wherein the electrode comprises a gear shaft extending in the first direction, the detection gear is rotatable about the gear shaft, and the detection gear covers a portion of the circumferential surface of the gear shaft.

[0019] The 13th invention of the present invention is a developing cartridge described in any one of the 1st to 12th inventions, a gear cover covering a part of the detection gear, and further comprises a gear cover located on the other side of the housing in the first direction.

[0020] The 14th invention of the present invention is a developing cartridge described in any one of the first to sixth inventions, wherein the housing has a first outer surface located on one side of the housing in the first direction and a second outer surface located on the other side of the housing in the first direction, and the electrical contact surface is located on the first outer surface.

[0021] The 15th invention of the present invention is a developing cartridge of the 14th invention, and is characterized in that the memory medium is located on the first outer surface.

[0022] The 16th invention of the present invention is a developing cartridge of the 14th invention or the 15th invention, and the detection gear is characterized by being located on the second outer surface.

[0023] The 17th invention of the present invention is a developing cartridge of the 16th invention, and further comprises a second shaft located on the second outer surface and a second shaft extending in the first direction along the second axis, and the detection gear is rotatable with respect to the second shaft.

[0024] The 18th invention of the present invention is a developing cartridge of the 17th invention, wherein the second shaft extends from the second outer surface of the housing.

[0025] The 19th invention of the present invention is a developing cartridge of the 17th invention, wherein the housing further comprises a through hole penetrating the second outer surface and a cap installed in the through hole, and the second shaft extends from the cap.

[0026] The 20th invention of the present invention is a developing cartridge described in any one of the 17th to 19th inventions, a developing roller rotatable about a rotation axis extending in the first direction, a developing roller having a roller shaft extending in the first direction, and further comprises an electrode electrically connected to the roller shaft, wherein the electrode is located on the other side of the housing in the first direction.

[0027] The 21st invention of the present invention is a developing cartridge of the 20th invention, wherein the electrode comprises a gear shaft extending in the first direction, the gear shaft is the second shaft, the detection gear is rotatable about the gear shaft, and the detection gear covers a portion of the circumferential surface of the gear shaft.

[0028] The 22nd invention of the present invention is a developing cartridge of any one of the 16th to 21st inventions, a gear cover covering a part of the detection gear, and further comprises a gear cover located on the second outer surface.

[0029] The 23rd invention of the present invention is a developing cartridge of any one of the 14th to 22nd inventions, and the coupling is characterized by being located on the first outer surface.

[0030] The 24th invention of the present invention is a developing cartridge of the 23rd invention, wherein the coupling comprises a coupling gear rotatable together with the coupling, and the agitator comprises a first agitator gear mounted on the first shaft, and further comprises a first agitator gear located on the first outer surface and rotatable together with the first shaft, and is characterized in that the coupling gear and the first agitator gear mesh.

[0031] The 25th invention of the present invention is a developing cartridge of the 23rd invention, further comprising a first idler gear located on the first outer surface, wherein the coupling includes a coupling gear that is rotatable together with the coupling and meshes with the first idler gear, and the agitator is a first agitator gear mounted on the first shaft, and further comprises a first agitator gear located on the first outer surface, rotatable together with the first shaft, and meshes with the first idler gear.

[0032] The 26th invention of the present invention is a developing cartridge of any one of the 23rd to 25th inventions, wherein the agitator is a second agitator gear mounted on the first shaft, and further comprises a second agitator gear located on the second outer surface and rotatable together with the first shaft, and is characterized in that the second agitator gear and the detection gear mesh.

[0033] The 27th invention of the present invention is a developing cartridge of any one of the 23rd to 25th inventions, further comprising a second idler gear located on the second outer surface and meshing with the detection gear, and the agitator is a second agitator gear fixed to the first shaft, and further comprises a second agitator gear located on the second outer surface, rotatable together with the first shaft, and meshing with the second idler gear.

[0034] The 28th invention of the present invention is a developing cartridge of the 24th or 25th invention, wherein the first shaft comprises a first end portion in the first direction and a second end portion spaced apart from the first end portion in the first direction, the first end portion penetrates the first outer surface, and the first agitator gear is mounted on the first end portion.

[0035] The 29th invention of the present invention is a developing cartridge of the 26th or 27th invention, wherein the first shaft comprises a first end portion in the first direction and a second end portion spaced apart from the first end portion in the first direction, the second end portion penetrates the first outer surface, and the second agitator gear is mounted on the second end portion.

[0036] The 30th invention of the present invention is a developing cartridge of any one of the 1st to 29th inventions, and the coupling is characterized by having a concave or convex portion for receiving a driving force.

[0037] The 31st invention of the present invention is a developing cartridge of any one of the 1st to 30th inventions, and the detection gear is characterized by having a shape that indicates information regarding the specifications of the developing cartridge.

[0038] The 32nd invention of the present invention is a developing cartridge of the 31st invention, and the specification is characterized by the number of pages that can be printed using the developing cartridge.

[0039] The 33rd invention of the present invention is a developing cartridge of any one of the 1st to 30th inventions, and the detection gear is characterized by being rotatable from a first position indicating that the developing cartridge is in an unused state to a second position indicating that the developing cartridge is in a used state.

[0040] The 34th invention of the present invention is a developing cartridge of any one of the 1st to 33rd inventions, wherein the detection gear comprises a plurality of teeth, and the plurality of teeth are arranged in a portion of the periphery of the detection gear.

[0041] The 35th invention of the present invention is a developing cartridge of any one of the 1st to 34th inventions, and the detection gear is characterized by including a projection extending in the first direction.

[0042] The 36th invention of the present invention is a developing cartridge of the 35th invention, and the detection gear is characterized by including a plurality of the above-mentioned protrusions.

[0043] The 37th invention of the present invention is a developing cartridge of any one of the 1st to 36th inventions, and the memory medium is characterized by storing information regarding the developing cartridge.

[0044] The 38th invention of the present invention is a developing cartridge of any one of the 1st to 37th inventions, wherein the memory medium is located on one side of the housing in the first direction and the memory medium has the electrical contact surface. Effects of the invention

[0045] According to the first to 38th inventions of the present invention, in a developing cartridge, the electrical contact surface of the coupling and the storage medium is located on one side of the housing in the first direction, and the detection gear is located on the other side of the housing in the first direction, so the coupling, the detection gear, and the electrical contact surface of the storage medium can be efficiently arranged.

[0046] In addition, according to the second invention of the present invention, since the memory medium is located on one side of the housing in the first direction, the coupling, the detection gear, the electrical contact surface of the memory medium, and the memory medium can be efficiently arranged.

[0047] In addition, according to the 20th invention of the present invention, since the electrode is located on the other side of the housing in the first direction, the coupling, the detection gear, the electrical contact surface of the memory medium, and the electrode can be efficiently arranged. In addition, since the electrical contact surface is located on one side of the housing in the first direction and the electrode is located on the other side of the housing in the first direction, electrical interference between the electrode and the electrical contact surface can be reduced.

[0048] In addition, according to the 21st invention of the present invention, the detection gear is rotatable with respect to a gear shaft containing an electrode. Since a part of the electrode can be used as a gear shaft in which the detection gear is rotatable, the detection gear and the electrode can be efficiently positioned on the other side of the housing in the first direction.

[0049] In addition, according to the 38th invention of the present invention, since the memory medium has an electrical contact surface, the memory medium and the electrical contact surface can be efficiently arranged on one side of the housing in the first direction. Brief explanation of the drawing

[0050] Figure 1 is a perspective view of a developing cartridge. Figure 2 is a perspective view of a developing cartridge. Figure 3 is a perspective view of a developing cartridge. Figure 4 is a perspective view of a developing cartridge. Figure 5 is a perspective view of a developing cartridge. Figure 6 is a conceptual diagram of a developing cartridge. FIG. 7 is a perspective view of the development cartridge and drum cartridge of the modified example. FIG. 8 is a drawing illustrating the appearance of a drum cartridge being mounted on an image forming device while the development cartridge of a modified example is mounted on the drum cartridge. Specific details for implementing the invention

[0051] Hereinafter, suitable embodiments of the present invention will be described with reference to the drawings. In addition, in the following embodiments, the direction in which the rotation axis of the developing roller extends is referred to as the “first direction.” In addition, the direction that is orthogonal to the first direction and parallel to the straight line connecting the agitator shaft (21) of the agitator (20) and the roller shaft (32) of the developing roller (30) is referred to as the “second direction.”

[0052] <1. Overall Components of the Developing Cartridge>

[0053] FIGS. 1 to 5 are perspective views of a developing cartridge (1) that is an example of the present invention. FIG. 6 is a schematic diagram of a developing cartridge (1) showing the positional relationship of each gear. This developing cartridge (1) is used in an electronic photographic image forming device (e.g., a laser printer or an LED printer) and is a unit that supplies a developer (e.g., toner) to a photosensitive drum. As shown in FIG. 1, the developing cartridge (1) of the present embodiment is mounted on a drawer unit (90) having an image forming device.

[0054] In this embodiment, four developing cartridges (1) are mounted in a single drawer unit (90). The four developing cartridges can accommodate developers of different colors (e.g., each of cyan, magenta, yellow, and black). The developer is, for example, toner. The drawer unit (90) has four cartridge holding supports (91). A photosensitive drum is installed in each of the cartridge holding supports (91).

[0055] A drawer unit (90) can be withdrawn from an image forming device, and a developing cartridge (1) can be mounted on each of the four cartridge holding supports (91) of the drawer unit (90). Additionally, a developing cartridge (1) can be removed from the drawer unit (90) by withdrawing the drawer unit (90) from the image forming device.

[0056] As illustrated in FIGS. 2 to 5, the developing cartridge (1) of the present embodiment has a casing (10), an agitator (20), a developing roller (30), a first gear part (40), a second gear part (50), and an IC (Integrated Circuit) chip assembly (60).

[0057] The casing (10) is a housing capable of accommodating a developer (e.g., toner) for electronic photo printing. The casing (10) has a first outer surface (11) and a second outer surface (12). The first outer surface (11) is an outer surface on one side of the casing (10) in the first direction. The second outer surface (12) is an outer surface on the other side of the casing (10) in the first direction. The first outer surface and the second outer surface are spaced apart in the first direction. A first gear part (40) and an IC chip assembly (60) are located on the first outer surface (11). A second gear part (50) is located on the second outer surface (12). The casing (10) extends in the first direction between the first outer surface (11) and the second outer surface (12). Inside the casing (10), a toner chamber (13) for receiving toner is installed. Additionally, the first direction is the extension direction of the casing (10) and the developing roller (30).

[0058] The agitator (20) is a stirring device extending in a first direction. The agitator (20) has an agitator shaft (21) and a stirring blade (22). The agitator shaft (21) extends along a rotation axis (81) extending in a first direction. The agitator shaft (21) is columnar, extending along the first direction. Additionally, the agitator shaft (21) constitutes a "first shaft." The stirring blade (22) widens outward in the radial direction from the agitator shaft (21). The stirring blade (22) is placed within the toner chamber (13) of the casing (10).

[0059] As illustrated in FIG. 4, the agitator shaft (21) has a first end (211) and a second end (not shown). The first end (211) is one end of the agitator shaft (21) in the first direction. The first end (211) penetrates the first outer surface (11) of the casing (10). A first agitator gear (44), which will be described later, is mounted on the first end (211). Specifically, the first agitator gear (44) is fixed so as not to move relative to the first end (211). Additionally, the first agitator gear (44) is located on the first outer surface (11).

[0060] The second end is the other end of the agitator shaft (21) in the first direction. The second end penetrates the second outer surface (12) of the casing (10). As shown in FIG. 5, a second agitator gear (51), which will be described later, is mounted on the second end. Specifically, the second agitator gear (51) is fixed so as not to move relative to the second end. Additionally, the second agitator gear (51) is located on the second outer surface (12).

[0061] With the above configuration, the agitator shaft (21) and the stirring blade (22) rotate together with the first agitator gear (44) and the second agitator gear (51). When the agitator (20) rotates, the stirring blade (22) rotates, and the toner in the toner chamber (13) is stirred.

[0062] The developing roller (30) is a roller rotatable about a rotation axis (82) extending in a first direction. The developing roller (30) of the present embodiment has a roller body (31) and a roller shaft (32). The roller body (31) is a cylindrical member extending in a first direction. For example, elastic rubber is used as the material for the roller body (31). The roller shaft (32) is a roughly cylindrical member penetrating the roller body (31) in a first direction. A metal or a conductive resin is used as the material for the roller shaft (32). The roller body (31) is fixed so as not to rotate relative to the roller shaft (32). Therefore, when the roller shaft (32) rotates, the roller body (31) also rotates together with the roller shaft (32).

[0063] Additionally, the roller shaft (32) does not have to penetrate the roller body (31) in the axial direction. For example, a pair of roller shafts (32) may each extend in the axial direction from both ends of the roller body (31).

[0064] One end of the roller shaft (32) in the first direction is fixed so as not to rotate relative to the developing gear (42) described later. 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).

[0065] Here, the direction parallel to the straight line connecting the agitator shaft (21) and the roller shaft (32) at the same position in the first direction is defined as the second direction. In the second direction, the roller shaft (32) is located on one side of the agitator shaft (21). Also, in the second direction, the agitator shaft (21) is located on the other side of the roller shaft (32). Additionally, the second direction is a direction perpendicular to the first direction.

[0066] The casing (10) has an opening (14). The opening (14) communicates with the toner chamber (13) and the outside. The opening (14) is located at one end of the casing (10) in the second direction. The developing roller (30) is located in the opening (14). That is, the developing roller (30) is located near one end of the casing (10) in the second direction.

[0067] When the image forming device is in operation, toner is supplied from the toner chamber (13) inside the casing (10) to the outer surface of the developing roller (30) through a supply roller (not shown) in the developing cartridge (1). At that time, the toner is triboelectrically charged between the supply roller and the developing roller (30). Meanwhile, a bias voltage is applied to the roller shaft (32) of the developing roller (30) by power supplied from the image forming device. Because of this, the toner is attracted to the outer surface of the roller body (31) by the electrostatic force between the roller shaft (32) and the toner.

[0068] Additionally, the developing cartridge (1) has a layer thickness regulating blade, which is omitted from the illustration. The layer thickness regulating blade sets the toner on the outer surface of the roller body (31) to a certain thickness. After that, the toner on the outer surface of the roller body (31) is supplied to a photosensitive drum installed in the drawer unit (90). At this time, the toner moves from the roller body (31) to the photosensitive drum according to the electrostatic latent image formed on the outer surface of the photosensitive drum. By doing so, the electrostatic latent image on the outer surface of the photosensitive drum becomes visible.

[0069] The first gear section (40) is located on one side of the casing (10) in the first direction. That is, the first gear section (40) is located on the first outer surface (11). FIG. 4 is a perspective view of the developing cartridge (1) with the first gear section (40) disassembled. As shown in FIG. 4, the first gear section (40) has a coupling (41), a developing gear (42), an idler gear (43), a first agitator gear (44), and a first gear cover (45). Accordingly, the coupling (41), the developing gear (42), the idler gear (43), and the first agitator gear (44) are located on the first outer surface (11). Also, in FIG. 4, the illustration of multiple gear teeth of each gear is omitted.

[0070] The coupling (41) is the part that initially receives the driving force supplied from the image forming device. The coupling (41) is capable of rotating around a rotation axis (83) that extends in a first direction. Additionally, the rotation axis (83) that serves as the rotation center of the coupling (41) constitutes the "first axis." The coupling (41) has a coupling part (411) and a coupling gear (412). The coupling part (411) and the coupling gear (412) are formed, for example, from a single resin.

[0071] In the coupling portion (411), a fastening hole (413) that is recessed in a first direction is formed. The fastening hole (413) is a recessed portion for receiving driving force from an image forming device. Additionally, the coupling portion (411) may have a convex portion for receiving driving force from an image forming device instead of the fastening hole (413). Furthermore, a plurality of gear teeth are provided at equal intervals along the entire circumference of the coupling gear (412).

[0072] When the drawer unit (90) equipped with the developing cartridge (1) is housed within the image forming device, the drive shaft of the image forming device is inserted into the fastening hole (413) of the coupling part (411). By doing so, the drive shaft and the coupling part (411) are connected in such a way that they cannot rotate relative to each other. Therefore, when the drive shaft rotates, the coupling part (411) rotates, and the coupling gear (412) also rotates together with the coupling part (411).

[0073] The developing gear (42) is a gear for rotating the developing roller (30). The developing gear (42) is capable of rotating around a rotation axis (82) that extends in a first direction. On the outer circumference of the developing gear (42), a plurality of gear teeth are provided at equal intervals along 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) are meshed with each other. Additionally, the developing gear (42) is fixed to one end of the roller shaft (32) of the developing roller (30) in the first direction so as not to rotate relative to it. Because of this, when the coupling gear (412) rotates, the developing gear (42) rotates, and the developing roller (30) also rotates together with the developing gear (42).

[0074] The idler gear (43) is a gear for transmitting the rotation of the coupling gear (412) to the first agitator gear (44). Additionally, the idler gear (43) constitutes the "first idler gear." The idler gear (43) can rotate around a rotation axis (84) extending in the first direction. The idler gear (43) has a large diameter gear section (431) and a small diameter gear section (432) arranged in the first direction (see FIG. 6). The small diameter gear section (432) is located on the other side of the large diameter gear section (431) in the first direction. That is, the small diameter gear section (432) is located between the large diameter gear section (431) and the first outer surface (11) of the casing (10). For this reason, the large diameter gear section (431) is positioned spaced apart from the first outer surface (11) than the small diameter gear section (432). The diameter of the small diameter gear section (432) is smaller than the diameter of the large diameter gear section (431). In other words, the diameter of the tooth circle of the small diameter gear section (432) is smaller than the diameter of the tooth circle of the large diameter gear section (431). The large diameter gear section (431) and the small diameter gear section (432) are formed, for example, by a single resin.

[0075] On the outer periphery of the large diameter gear section (431) and the small diameter gear section (432), a plurality of gear teeth are provided at equal intervals along the entire circumference of each. The number of gear teeth of the small diameter gear section (432) is less than the number of gear teeth of the large diameter gear section (431). At least some of the gear teeth among the plurality of gear teeth of the coupling gear (412) and at least some of the gear teeth among the plurality of gear teeth of the large diameter gear section (431) are engaged with each other. Additionally, at least some of the gear teeth among the plurality of gear teeth of the small diameter gear section (432) and at least some of the gear teeth among the plurality of gear teeth of the first agitator gear (44) are engaged with each other. When the coupling gear (412) rotates, the large diameter gear section (431) rotates, and the small diameter gear section (432) also rotates together with the large diameter gear section (431). And along with the rotation of the small diameter gear section (432), the first agitator gear (44) also rotates.

[0076] The first agitator gear (44) is a gear for rotating the agitator (20) inside the toner chamber (13). The first agitator gear (44) is capable of rotating around a rotation axis (81) extending in a first direction. On the outer circumference of the first agitator gear (44), a plurality of gear teeth are provided at equal intervals along the entire circumference. As described above, at least some of the gear teeth of the plurality of gear teeth of the small diameter gear portion (432) and at least some of the gear teeth of the plurality of gear teeth of the first agitator gear (44) are engaged with each other. Additionally, the first agitator gear (44) is fixed to the aforementioned second end of the agitator shaft (21) so as not to rotate relative to it. For this reason, when power is transmitted from the coupling (41) to the first agitator gear (44) through the idler gear (43), the first agitator gear (44) rotates, and the agitator (20) also rotates together with the first agitator gear (44). That is, the agitator (20), including the agitator shaft (21), rotates in conjunction with the coupling (41).

[0077] Additionally, in this phenomenon cartridge (1), an idler gear (43) is positioned between the coupling gear (412) and the first agitator gear (44), but the idler gear (43) may be omitted and the coupling gear (412) and the first agitator gear (44) may be configured to mesh directly.

[0078] The first gear cover (45) is located on one side of the casing (10) in the first direction. Specifically, the first gear cover (45) is located on the first outer surface (11). The first gear cover (45) is fixed to the first outer surface (11), for example, by screw fastening. The coupling gear (412), the current gear (42), the idler gear (43), and the first agitator gear (44) are accommodated between the first outer surface (11) and the first gear cover (45). The fastening hole (413) of the coupling part (411) is exposed to the outside of the first gear cover (45), as shown in FIG. 2. The first gear cover (45) of this embodiment also serves as a holder cover that holds and supports the holder (62) of the IC chip assembly (60) described later. The structure of the first gear cover (45) as a holder cover will be described later.

[0079] The second gear section (50) is located on the other side of the casing (10) in the first direction. That is, the second gear section (50) is located on the second outer surface (12). FIG. 5 is a perspective view of the development cartridge (1) in a disassembled state with the second gear section (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 gear cover (54). Accordingly, the second agitator gear (51), the detection gear (52), and the conductive member (53) are located on the second outer surface (12). Also, in FIG. 5, the gear teeth of the second agitator gear (51) are omitted from the illustration.

[0080] 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) is capable of rotating around a rotation axis (81) that extends in a first direction. On the outer circumference of the second agitator gear (51), a plurality of gear teeth are provided at equal intervals along the entire circumference. The gear teeth of the second agitator gear (51) and the gear teeth of the detection gear (52) mesh with each other. Additionally, the second agitator gear (51) is fixed to the aforementioned first end of the agitator shaft (21) so as not to rotate relative to it. Because of this, when the agitator shaft (21) rotates, the second agitator gear (51) also rotates.

[0081] The detection gear (52) is a gear for transmitting information about the developing cartridge (1) to the image forming device. The information about the developing cartridge (1) includes, for example, whether the developing cartridge (1) is a new (unused) developing cartridge or a developed cartridge that has been used up. In addition, the information about the developing cartridge (1) includes, for example, the specifications of the developing cartridge (1). The specifications of the developing cartridge (1) include, for example, the number of printable copies (yield copies) by the developer contained in the developing cartridge (1).

[0082] The detection gear (52) can rotate around a rotation axis (85) that extends in a first direction. Additionally, the rotation axis (85), which serves as the rotation center of the detection gear (52), constitutes a "second axis." The detection gear (52) has a plurality of gear teeth (521). The plurality of gear teeth (521) are arranged in a portion of the circumference of the detection gear (52). That is, the detection gear (52) is a gear in which a plurality of gear teeth (521) are arranged in a portion of its outer circumference, and another portion does not have gear teeth (521).

[0083] When the developing cartridge (1) is not in use, the gear teeth of the detection gear (52) mesh with the second agitator gear (51). In this case, the detection gear (52) rotates in conjunction with the agitator (20) including the agitator shaft (21). Therefore, when driving force is input to the coupling (41), the driving force is transmitted through the coupling (41), the idler gear (43), the first agitator gear (44), the agitator (20), and the second agitator gear (51), and the detection gear (52) rotates. That is, the detection gear (52) can rotate in conjunction with the coupling (41).

[0084] When using the image forming device, the developing cartridge (1) is mounted in the drawer unit (90), and the drawer unit (90) is housed within the image forming device to begin use. After mounting the unused developing cartridge (1) in the drawer unit (90) and housing the drawer unit (90) within the image forming device, when driving force is input to the coupling (41), the detection gear (52) rotates. After that, when the detection gear (52) rotates beyond a certain angle, the meshing between the second agitator gear (51) and the detection gear (52) is released, and the detection gear (52) stops rotating.

[0085] When the developing cartridge (1) is not in use, the detection gear (52) is positioned in a first position indicating that the developing cartridge (1) is in an unused state. When the detection gear (52) is in the first position, the gear teeth of the detection gear (52) mesh with the second agitator gear (51). When the use of the developing cartridge (1) begins, the detection gear (52) rotates from the first position to the second position. Accordingly, after the use of the developing cartridge (1) begins, the detection gear (52) is positioned in a second position indicating that the developing cartridge (1) is in a used-out state. When the detection gear (52) is in the second position, the gear teeth of the detection gear (52) do not mesh with the second agitator gear (51). In this way, the state of the detection gear (52) changes between when it is not in use and after it begins to be used.

[0086] Additionally, the detection gear (52) may be a movable gear capable of moving in the first direction. The movable gear does not have to be a non-clutched gear. That is, the movable gear may have multiple gear teeth on its outer surface in a circular manner. In this case, when the movable gear rotates, the movable gear moves toward the first direction, thereby disengaging the mesh between the movable gear and the second agitator gear (51). Additionally, the movable gear may move in a direction that is spaced apart from the second outer surface (12) in the first direction. Additionally, the movable gear may move in a direction that is close to the second outer surface (12) in the first direction.

[0087] For this reason, when the used-out development cartridge (1) is mounted in the drawer unit (90) and the drawer unit (90) is housed in the image forming device, the detection gear (52) and the second agitator gear (51) are disengaged, so the detection gear (52) does not rotate.

[0088] Additionally, another gear may be interposed between the second agitator gear (51) and the detection gear (52). For example, the second gear section (50) may have a second idler gear that meshes with both the second agitator gear (51) and the detection gear (52). The second idler gear is located on the second outer surface (12). The rotation of the second agitator gear (51) may be transmitted to the detection gear (52) through the second idler gear.

[0089] The conductive member (53) is a conductive member. A conductive metal or a conductive resin is used as the material of the conductive member (53). The 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 a first direction. The gear shaft (531) is located on the second outer surface (12). Additionally, the gear shaft (531) extends in the first direction along the rotation axis (85) from the second outer surface (12). Additionally, the rotation axis (85) forms the "second axis." Additionally, the gear shaft (531) forms the "second shaft." The detection gear (52) rotates around the gear shaft (531) while being supported by the gear shaft (531). Additionally, the conductive member (53) has a bearing portion (532). The bearing portion (532) contacts the roller shaft (32) of the developing roller (30). Additionally, a portion of the conductive member (53) may contact the roller shaft (32). Furthermore, the roller shaft (32) may be inserted into the conductive member (53) so that the roller shaft (32) contacts the conductive member (53).

[0090] The drawer unit (90) has a conductive lever (not shown) that contacts a gear shaft (531). When the lever contacts the gear shaft (531), the conductive member (53) and the roller shaft (32) become electrically connected to the lever. When the image forming device is driven, the roller shaft (32) is maintained at a predetermined bias voltage by the power supplied from the lever to the gear shaft (531). That is, the conductive member (53) including the gear shaft (531) acts as an electrode to supply a bias voltage to the roller shaft (32).

[0091] The second gear cover (54) is located on the other side of the casing (10) in the first direction. Specifically, the second gear cover (54) is located on the second outer surface (12). The second gear cover (54) is secured to the second outer surface (12), for example, by screw fastening. At least a portion of the second agitator gear (51), the detection gear (52), and the conductive member (53) are accommodated between the second outer surface (12) and the second gear cover (54). Because of this, the second gear cover (54) covers at least a portion of the detection gear (52). Additionally, the second gear cover (54) has an opening (541). A portion of the detection gear (52) and a portion of the gear shaft (531) are exposed through the opening (541). The above-mentioned lever contacts the detection gear (52) or gear shaft (531) through the opening (541).

[0092] The detection gear (52) has a projection (522). The detection gear (52) partially covers the outer surface of the gear shaft (531). The projection (522) is located on the other side of the plurality of gear teeth (521) in the first direction. Additionally, the projection (522) extends in the first direction. The projection (522) has an arc-shaped portion centered on the axis of rotation (85) when viewed in the first direction. The projection (522) covers a portion of the circumferential surface of the gear shaft (531). The projection (522) is rotatable together with the detection gear (52).

[0093] In the unused development cartridge (1), a portion of the gear shaft (531) is exposed to the opening (541). That is, the lever of the drawer unit (90) comes into contact with the gear shaft (531). When the image forming device is started and driving force is input to the coupling (41), the detection gear (52) rotates. When this happens, a projection (522) is inserted between the lever and the gear shaft (531) along with the rotation of the detection gear (52). As a result, the lever and the gear shaft (531) become non-contact. After that, when the detection gear (52) rotates further, the lever and the gear shaft (531) come into contact again. When the detection gear (52) rotates beyond a certain angle, the detection gear (52) stops rotating. Because of this, contact between the lever and the gear shaft (531) is maintained.

[0094] In this way, as the detection gear (52) rotates, the contact state between the lever and the gear shaft (531) changes according to the shape of the detection gear (52). By recognizing the change in the contact state, the image forming device identifies whether the mounted developing cartridge (1) is new and the specifications of the developing cartridge (1). That is, the detection gear (52) has a shape that indicates information regarding the developer of the developing cartridge (1).

[0095] In addition, in this developing cartridge (1), the detection gear (52) had a single projection (522), but the present invention is not necessarily limited to this. The detection gear (52) may have a plurality of projections extending in the first direction instead of the projection (522). Also, the position or length of the projection (522) in the circumferential direction may differ from that of the present embodiment. The shape of the detection gear (52) may vary depending on specifications such as the number of printable copies of the developing cartridge (1). Specifically, the number of projections (522), the spacing of the plurality of projections (522) in the circumferential direction, the length of each projection (522) in the circumferential direction, and the length of each projection (522) in the diameter direction may vary depending on the specifications. In this way, by providing variations in the number of projections (522) or the position in the circumferential direction, it becomes possible to display various specifications of the developing cartridge (1) to the image forming device.

[0096] In addition, in this phenomenon cartridge (1), the contact state between the lever and the gear shaft (531) was changed using a projection (522), but the present invention is not necessarily limited to this. For example, the contact state between the lever and the gear shaft (531) may be changed through another member that moves in conjunction with the rotation of the detection gear (52). Specifically, the detection gear (52) and the projection (522) may be separate. In this case, the projection (522) rotates together with the rotation of the detection gear (52).

[0097] For example, the detection gear (52) may have a cam, and the cam may come into contact with the projection (522). In this case, the cam rotates together with the rotation of the detection gear (52), and as the cam rotates, it comes into contact with the projection (522), causing the projection (522) to move. The projection (522) may be rotatably installed with respect to a shaft installed on the second outer surface (12) or the second gear cover (54). Additionally, the shaft having the projection (522) may be inserted into a hole having the second outer surface (12) or the second gear cover (54), and the projection (522) may be rotatably held and supported.

[0098] Additionally, the detection gear (52) may have a shape indicating other information. For example, the detection gear (52) may have a shape indicating the color of the developer contained in the development cartridge (1).

[0099] The IC chip assembly (60) is located on one side of the casing (10) in the first direction. That is, the IC chip assembly (60) is positioned on the outside of the first outer surface (11) of the casing (10). As illustrated in FIGS. 2 to 5, the IC (Integrated Circuit) chip assembly (60) has an IC chip (61) and a holder (62). The IC chip (61) is a storage medium. Various information regarding the developing cartridge (1) is recorded on the IC chip (61). The holder (62) is a member that holds and supports the IC chip (61). The holder (62) is held and supported by the first gear cover (45).

[0100] As illustrated in FIG. 5, the IC chip (61) has an electrical contact surface (611). The electrical contact surface (611) is made of a metal that is a conductor. The electrical contact surface (611) is located on one side of the casing (10) in a first direction. Additionally, the electrical contact surface (611) is located on the first outer surface (11).

[0101] The drawer unit (90) has an electrical connector. The electrical connector is, for example, made of metal. When the developing cartridge (1) is mounted on the drawer unit (90), the electrical connector of the drawer unit (90) comes into contact with the electrical contact surface (611). By doing so, the image forming device can perform at least one of reading information from the IC chip (61) and writing information to the IC chip (61). The electrical connector of the drawer unit (90) is, for example, made of metal. In this developing cartridge (1), both the body of the IC chip (61) and the electrical contact surface (611) of the IC chip (61) are located on one side of the casing (10) in the first direction.

[0102] At least a portion of the holder (62) is covered by the first gear cover (45). The holder (62) has three bosses (621a, 621b, 621c). Two bosses (621a, 621b) extend in a first direction toward the first gear cover (45) from the side opposite to the side facing the casing (10) of the holder (62). Two bosses (621a, 621b) are arranged in a second direction. Boss (621c) extends in a first direction toward the casing (10) from the side facing the casing (10) of the holder (62). Meanwhile, as shown in FIGS. 2 and 4, the first gear cover (45) has two through holes (451a, 451b). Two through holes (451a, 451b) are arranged in a second direction. Each through hole (451a, 451b) penetrates the first gear cover (45) in the first direction. Additionally, the casing (10) has a concave portion (15). The concave portion (15) is recessed in the first direction on the first outer surface (11) of the casing (10).

[0103] Boss (621a) is inserted into the through hole (451a). Boss (621b) is inserted into the through hole (451b). Boss (621c) is inserted into the recess (15). The size (inner dimension) of the through hole (451a) is larger than the size (outer dimension) of the corresponding boss (621a). Also, the size (inner dimension) of the through hole (451b) is larger than the size (outer dimension) of the corresponding boss (621b). Also, the size (inner dimension) of the recess (15) is larger than the size (outer dimension) of the boss (621c). Because of this, the holder (62) is capable of slight relative movement in a direction orthogonal to the first direction with respect to the casing (10) and the first gear cover (45). Additionally, the holder (62) may be movable in a first direction between the first gear cover (45) and the first outer surface (11).

[0104] Additionally, the number of bosses installed in the holder (62) may be one or three or more. Also, the number of through holes provided in the first gear cover (45) may be one or three or more. Additionally, the shape of each of the bosses (621a, 621b, 621c) may be a cylinder or a prismatic column.

[0105] Additionally, in this phenomenon cartridge (1), bosses (621a, 621b) are inserted into the through holes (451a, 451b), respectively, but the present invention is not necessarily so. The first gear cover (45) may have two concave portions instead of the through holes (451a, 451b). Bosses (621a, 621b) can be inserted into each of the two concave portions.

[0106] In order to miniaturize the image forming device, it is necessary to reduce the projection area of ​​the developing cartridge (1) in the first direction. That is, in order to miniaturize the image forming device, it is necessary to reduce the first outer surface (11) and the second outer surface (12). Meanwhile, the coupling (41), the electrical contact surface (611), and the detection gear (52) are each parts that are connected to the main body of the image forming device. For this reason, the coupling (41), the electrical contact surface (611), and the detection gear (52) cannot be arranged in an overlapping manner in the first direction.

[0107] As illustrated in FIG. 6, in this developing cartridge (1), the detection gear (52) is located on the other side of the casing (10) in the first direction. Additionally, the electrical contact surface (611) of the coupling (41) and the IC chip (61) is located on one side of the casing (10) in the first direction. In this way, by dividing the coupling (41), the electrical contact surface (611), and the detection gear (52) between the first outer surface (11) and the second outer surface (12), the first outer surface (11) and the second outer surface (12) can be made smaller. Accordingly, the developing cartridge (1) and the image forming device can be miniaturized.

[0108] In addition, in this embodiment, the coupling (41) is located on one side of the end of the agitator shaft (21) in the first direction in the second direction. Also, the detection gear (52) is located on one side of the end of the agitator shaft (21) in the first direction in the second direction. In this way, the coupling (41) and the detection gear (52) are positioned on the same side of the agitator shaft (21) in the second direction. By doing so, the length of the developing cartridge (1) in the second direction can be shortened. Accordingly, the developing cartridge (1) and the image forming device can be miniaturized in the second direction.

[0109] In particular, in this embodiment, since the detection gear (52) is supported by the conductive member (53), the detection gear (52) and the conductive member (53) need to be placed on the same outer surface among the first outer surface (11) and the second outer surface (12). Meanwhile, a high voltage bias is applied to the conductive member (53), which is an electrode. Because of this, if the distance between the electrical contact surface (611) of the conductive member (53) and the IC chip (61) is short, there is a risk that the IC chip (61) will be affected by high-frequency noise.

[0110] However, in this phenomenon cartridge, the detection gear (52) and the conductive member (53) are located on the second outer surface (12) opposite to the first outer surface (11) where the electrical contact surface (611) is positioned. Thus, electrical interference between the conductive member (53) and the electrical contact surface (611) can be reduced. Additionally, electrical interference between the conductive member (53) and the IC chip (61) can be reduced. For example, the generation of high-frequency noise in the IC chip (61) caused by high-voltage charge on the conductive member (53) can be suppressed.

[0111] In addition, in this embodiment, the entire IC chip (61) having an electrical contact surface (611) is located on the first outer surface (11) opposite to the first direction of the detection gear (52) and the conductive member (53). However, among the IC chip (61), at least only the electrical contact surface (611) is located on the first outer surface (11), and the main body of the IC chip (61) may be located on, for example, another side of the casing (10). Even in that case, electrical interference between the conductive member (53) and the electrical contact surface (611) can be reduced. In addition, electrical interference between the conductive member (53) and the IC chip (61) can be reduced. For example, the generation of high-frequency noise in the IC chip (61) caused by high-voltage charge on the conductive member (53) can be suppressed.

[0112] <2. Variation Example>

[0113] Although an embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment.

[0114] FIG. 7 is a perspective view of a developing cartridge (1A) and a drum cartridge (70A) of one variant example. The developing cartridge (1A) has a developing roller (30A), a coupling (41A), a detection gear (52A), and an IC chip (61A). In the example of FIG. 7, the developing cartridge (1A) is mounted to a drum cartridge (70A) rather than a drawer unit. The drum cartridge (70A) has a developing cartridge holding support (71A) that holds and supports one developing cartridge (1A). A photosensitive drum (72A) is installed on the developing cartridge holding support (71A). When the developing cartridge (1A) is mounted to the drum cartridge (70A), the developing roller (30A) of the developing cartridge (1A) comes into contact with the photosensitive drum (72A).

[0115] FIG. 8 is a diagram illustrating a drum cartridge (70A) holding and supporting a developing cartridge (1A) being mounted on an image forming device (100A). As shown in FIG. 8, the drum cartridge (70A) holding and supporting the developing cartridge (1A) is mounted to a drum cartridge holding support member (101A) installed on the image forming device (100A).

[0116] In this way, a developing cartridge (1A) of the type mounted on the drum cartridge (70A) may also adopt a structure equivalent to that of the developing cartridge of the above-described embodiment. Specifically, as shown in FIG. 7, in this developing cartridge (1A), the electrical contact surface (611A) of the coupling (41A) and the IC chip (61A) is located on one side of the casing (10A) in the first direction. In addition, the detection gear (52A) is located on the other side of the casing (10A) in the first direction. In this way, by dividing the coupling (41A), the electrical contact surface (611A), and the detection gear (52A) into one side and the other side in the first direction, the end surface of the developing cartridge (1A) in the first direction can be made smaller. Accordingly, the developing cartridge (1A) and the image forming device (100A) can be miniaturized.

[0117] In the above-described embodiment, the first shaft, the gear shaft (531), was extended from the second outer surface (12) toward the other side in the first direction. However, the gear shaft (531) does not need to be in direct contact with the second outer surface (12). For example, the casing (10) may further have a through hole penetrating the second outer surface (12) and a cap installed in the through hole, and the gear shaft may be extended from the cap toward the other side in the first direction. In this case, for example, the cap has a gear shaft that protrudes toward the detection gear (52) in the first direction. The detection gear (52) rotates around the gear shaft (531) while being supported by the gear shaft.

[0118] In addition, in the above-described embodiment, a plurality of gears within the first gear section (40) and the second gear section (50) were coupled to each other by the meshing of their gear teeth. However, a plurality of gears within the first gear section (40) and the second gear section (50) may be coupled to each other by friction. For example, instead of a plurality of gear teeth, a friction member (e.g., rubber) may be installed on the outer circumference of the two gears coupled to each other.

[0119] In addition, the developing cartridge (1) of the above-described embodiment was mounted to a drawer unit having an image forming device. However, the developing cartridge of the present invention may be mounted to a main body of an image forming device that does not have a drawer unit.

[0120] Furthermore, the detailed shape of the developing cartridge may differ from the shape shown in each drawing of the present invention. In addition, each element appearing in the above-described embodiments or variations may be appropriately combined to the extent that no contradiction occurs. Explanation of the symbols

[0121] 1, 1A: Developing cartridge 10: Casing 11 : First outer surface 12 : Second outer surface 20 : Agitator 21: Agitator shaft 22: Stirring blade 30: Developing roller 32: Roller shaft 41, 41A : Coupling 42 : Phenomenon Gear 43: Kids' Gear 44: 1st Agitator Gear 51: Second agitator gear 52, 52A: Detector gear 53: Lack of Challenge 61, 61A: IC chip 211: First end 412 : Coupling Gear 413: Fastening hole 451 : Through hole 521 : Gear teeth 522 : Protrusion 531: Gear shaft 611, 611A: Electrical contact surface

Claims

Claim 1 A developing cartridge comprising: a casing configured to accommodate a developer inside, wherein the casing extends in a first direction; a roller rotatable about a first axis extending in the first direction, wherein the roller includes a roller shaft extending in the first direction; a coupling rotatable about a second axis extending in the first direction, wherein the coupling is located on one side of the casing in the first direction; a projection movable according to the rotation of the coupling, wherein the projection is located on the other side of the casing in the first direction; an electrode electrically connected to the roller shaft, wherein the electrode is located on the other side of the casing in the first direction; and a storage medium comprising an electrical contact surface, wherein the electrical contact surface is located on one side of the casing in the first direction. A developing cartridge comprising a first shaft that is movable, wherein the first shaft extends in the first direction and the first shaft is movable according to the rotation of the coupling, the projection is movable according to the movement of the first shaft, and the electrical contact surface is oriented toward a third direction that intersects both the first direction and the second direction that intersects the first direction. Claim 2 In claim 1, the roller is a developing cartridge located on one side of the casing in the second direction. Claim 3 In paragraph 2, the electrical contact surface is a developing cartridge located on the opposite side of the roller with respect to the coupling in the second direction. Claim 4 In paragraph 3, the above-mentioned projection is a developing cartridge located on one side of the first shaft in the second direction. Claim 5 In paragraph 4, the coupling is a developing cartridge located on one side of the first shaft in the second direction. Claim 6 In paragraph 5, the electrical contact surface is a developing cartridge located on the other side of the first shaft in the second direction. Claim 7 A developing cartridge according to claim 1, wherein the coupling comprises a recess for receiving a driving force and a coupling gear rotatable together with the recess. Claim 8 A developing cartridge according to claim 7, further comprising: a first gear rotatable about a first gear axis extending in the first direction, wherein the first gear is located on one side of the casing in the first direction and the first gear meshes with the coupling gear; and a second gear rotatable about a second gear axis extending in the first direction, wherein the second gear is located on one side of the casing in the first direction and the second gear meshes with the first gear and the second gear is mounted on one end of the first shaft in the first direction. Claim 9 In claim 8, a developing cartridge further comprising a third gear rotatable about a third gear shaft extending in the first direction, wherein the third gear is located on the other side of the casing in the first direction, and the third gear is mounted on the other end of the first shaft in the first direction. Claim 10 A developing cartridge according to claim 1, further comprising an agitator rotatable about an agitator axis extending in the first direction, wherein the agitator comprises the first shaft. Claim 11 In claim 1, the projection is a developing cartridge movable relative to the casing. Claim 12 In claim 1, the protrusion is positioned further from the roller than the coupling is positioned from the roller in the second direction, in a developing cartridge. Claim 13 In Clause 12, the above-mentioned second direction is perpendicular to the above-mentioned first direction, a developing cartridge. Claim 14 In claim 1, the protrusion is spaced apart from the electrode in the first direction, forming a developing cartridge. Claim 15 A developing cartridge according to claim 1, wherein the casing comprises a first end and a second end spaced apart from the first end in the second direction, the roller is located at the first end, and the projection is located at the second end. Claim 16 In item 15, the above-mentioned second direction is perpendicular to the above-mentioned first direction, a developing cartridge. Claim 17 In claim 1, the above-mentioned projection is a developing cartridge extending in the above-mentioned first direction. Claim 18 In claim 1, the projection is formed on a detection gear rotatable around a rotation axis extending in the first direction, and the detection gear is movable between a first position indicating the development cartridge in an unused state and a second position indicating the development cartridge in a used state. Claim 19 In claim 1, the electrode is a developing cartridge extending in the first direction from one side of the casing. Claim 20 In paragraph 1, the electrode is a developing cartridge in which a conductive resin is used. Claim 21 In paragraph 1, the electrode is a developing cartridge in which metal is used. Claim 22 In claim 1, the memory medium is a developing cartridge located on one side of the casing in the first direction. Claim 23 A developing cartridge according to claim 1, wherein the casing comprises a first outer surface located on one side of the casing and a second outer surface located on the other side of the casing, and the casing comprises a through hole penetrating the second outer surface and a cap installed in the through hole. Claim 24 In claim 1, the above-mentioned memory medium is a developing cartridge that stores information regarding the developing cartridge. Claim 25 A developing cartridge according to claim 1, wherein the developing cartridge further comprises a gear rotatable about a gear shaft extending in the first direction, the gear being located on the other side of the casing in the first direction, and the projection being rotatable together with the gear. Claim 26 In claim 1, the protrusion is a developing cartridge rotatable about a detection axis extended in the first direction. Claim 27 A developing cartridge according to claim 26, further comprising a cover that covers a portion of the above-mentioned projection and is located on the other side of the casing in the first direction.

Images