Developing cartridge

Abstract

The utility model relates to a developing box detachably mounted in imaging equipment, which comprises a shell, a toner cartridge, a toner cartridge cover, a toner cartridge cover, a toner cartridge cover and a toner cartridge cover, and is characterized in that a toner accommodating cavity for accommodating toner is formed in the shell; the developing roller is rotatably arranged in the shell and used for bearing carbon powder, and the developing roller rotates along a rotating axis parallel to the longitudinal direction; a first sealing member mounted on the housing, extending in the longitudinal direction, contacting the outer circumferential surface of the developing roller, and preventing the toner from leaking between the developing roller and the housing; in the rotation direction of the developing roller, the developing roller and the first sealing piece have a contact position, and an exposure space is formed between the developing roller and the first sealing piece at the upstream of the contact position; the second sealing part extends in the longitudinal direction, is arranged adjacent to the first sealing part and is used for covering at least one part of the exposed space; the second sealing piece and the shell are integrally formed; the design is beneficial to saving material cost and reducing labor cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electrophotographic imaging, especially to a developing box which is detachably installed in an electrophotographic imaging device. BACKGROUND

[0002] The developing box comprises a housing for accommodating toner and a developing roller rotatably arranged in the housing, when the developing box is used for imaging, the developing roller carries toner on its surface and supplies the toner to a photosensitive drum on which an electrostatic latent image is formed, so that the electrostatic latent image is developed.

[0003] Generally, to prevent toner from leaking between the developing roller and the housing, the developing box is provided with a first seal member for contacting the outer circumferential surface of the developing roller, the developing roller and the first seal member have a contact position when the developing roller rotates in a rotation direction, and an exposed space is formed between the developing roller and the first seal member upstream of the contact position in the rotation direction, to prevent toner from floating out of the exposed space, the developing box comprises a second seal member arranged adjacent to the first seal member.

[0004] In the prior art, the second seal member is usually a flying powder prevention sheet attached to the housing, however, the second seal member is formed separately from the housing, which complicates the structure and assembly process of the developing box, resulting in high labor cost and high material cost. SUMMARY

[0005] To this end, the utility model adopts the following technical solutions to solve the above technical problems, specifically as follows:

[0006] The developing box is detachably installed in an imaging device, and the developing box comprises a housing formed with a toner accommodating cavity for accommodating toner, a developing roller rotatably arranged in the housing for carrying toner, the developing roller rotating along a rotation axis parallel to the longitudinal direction, a first seal member mounted on the housing and extending in the longitudinal direction, contacting the outer circumferential surface of the developing roller, for preventing toner from leaking between the developing roller and the housing, the developing roller and the first seal member having a contact position in the rotation direction of the developing roller, an exposed space being formed between the developing roller and the first seal member upstream of the contact position, a second seal member extending in the longitudinal direction and arranged adjacent to the first seal member, for covering at least part of the exposed space, and the second seal member being integrally formed with the housing.

[0007] Further, the housing has a mounting portion for mounting the first seal member, the second seal member and the mounting portion being connected to each other, and in a direction perpendicular to the longitudinal direction, the second seal member is farther away from the toner accommodating cavity than the mounting portion.

[0008] Further, the developing box further comprises a rib plate arranged on the housing, the rib plate being connected to the mounting portion for strengthening the strength of the housing.

[0009] Further, the developing cartridge further comprises a clearance provided on the second seal; in the longitudinal direction, the thickness of the second seal in the region where the clearance is located is less than the thickness of the region outside the clearance.

[0010] Further, the developing cartridge comprises a driving force receiving member for receiving driving force from the image forming device, and a first support provided at the longitudinal end of the housing, and an end cover, the driving force receiving member being exposed through the end cover; the end cover is provided with an end cover hole, the first support is provided with a support hole, and the housing is provided with a boss for forming an end screw hole; a screw passes through the end cover hole and the support hole in sequence into the screw hole, so that the end cover, the first support and the housing are fixedly connected; in the direction intersecting the longitudinal direction, the clearance overlaps the boss.

[0011] Further, in the longitudinal direction, the size of the clearance is not less than the size of the end screw hole.

[0012] Further, in the radial direction of the end screw hole, the size of the clearance is not less than the diameter of the end screw hole. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a perspective view of the developing cartridge of the present application.

[0014] Figure 2 is a sectional view along the AA direction in Figure 1

[0015] Figure 3 is a partial exploded view of the developing cartridge of the present application.

[0016] Figure 4 is an exploded view of the powder feeding roller and the bottom shell after being separated.

[0017] Figure 5 is an exploded view of the end seal and the bottom shell after being separated.

[0018] Figure 6A is a local enlarged view of the two ends of the bottom shell.

[0019] Figure 6B is Figure 5 a schematic view of the relative positions of some parts after being projected onto the plane M.

[0020] Figure 7 is a sectional view of the developing cartridge after being cut by the plane passing through the rotation axis of the developing roller and the rotation axis of the powder feeding roller.

[0021] Figure 8 ​is a partial enlarged view of one longitudinal end part of the developing box.

[0022] Figure 9 is a sectional view along Figure 8 the BB direction. DETAILED DESCRIPTION

[0023] Embodiments of the present application will be described in detail below with reference to the accompanying drawings. The developing box 100 according to the present application can be detachably installed to an image forming apparatus.

[0024] Figure 1 is a perspective view of the developing box according to the present application; Figure 2 is a sectional view along Figure 1 the AA direction. Figure 3 is an exploded view of part components of the developing box according to the present application; Figure 3 is an exploded view of part components of the developing box according to the present application; Figure 4 is an exploded view of the powder feeding roller and the bottom shell after being separated; Figure 5 is an exploded view of the end seal and the bottom shell after being separated; Figure 6A is a partial enlarged view of two end parts of the bottom shell according to the present application; Figure 6B is Figure 5 a schematic view of relative positions of part components after being projected to the plane M. Figure 7 is a sectional view of the developing box according to the present application after being cut by a plane passing through the rotation axis of the developing roller and the rotation axis of the powder feeding roller; Figure 8 is a partial enlarged view of one longitudinal end part of the developing box according to the present application; Figure 9 is a sectional view along Figure 8 the BB direction.

[0025] (Overall structure of the developing box)

[0026] As shown in Figure 1 , Figure 2 and Figure 3 , the developing box 100 comprises a housing 1, a rotating member 2 and a powder discharge blade 3, wherein the housing 1 comprises a face cover 11 and a bottom shell 12 combined with each other, a carbon powder accommodating cavity 10 for accommodating carbon powder is formed between the face cover 11 and the bottom shell 12, one side of the housing 1 facing the carbon powder accommodating cavity 10 or the rotating member 2 is an inner side, the side opposite to the inner side is an outer side, the length direction of the housing 1 is a first direction, the rotating member 2 is rotatably arranged on the housing 1, and at least a part of the rotating member 2 is opposite to the carbon powder accommodating cavity 10 along a direction perpendicular to the first direction.

[0027] The rotating member 2 at least comprises a developing roller 21 for carrying toner, the developing roller 21 rotates along a rotation axis L parallel to the first direction, when the developing cartridge 100 develops, the developing roller 21 is used to supply the carried toner to the photosensitive drum arranged oppositely to the developing roller 21, so that the latent image formed on the surface of the photosensitive drum is developed, specifically, the developing roller 21 comprises a developing roller shaft 211 and a developing layer 212 coated on the developing roller shaft 211, along the first direction, the developing roller shaft 211 protrudes from both ends of the developing layer 212, thus, the developing roller shaft 211 can penetrate the developing layer 212 along the first direction (as shown by the developing roller shaft in the dashed line in Figure 7 ), or can protrude from both ends of the developing layer 212 (as shown by the developing roller shaft in the solid line in Figure 7 ); as shown, along the first direction, the developing layer 212 can be divided into a toner carrying area S1 and a non-toner carrying area S2, the two non-toner carrying areas S2 are arranged at intervals, and the toner carrying area S1 is located between the two non-toner carrying areas S2, the toner carrying area S1 is used to carry toner. Figure 3

[0028] The toner outlet blade 3 is fixedly installed on the housing 1 and is used to adjust the amount of toner carried on the surface of the developing roller 21.

[0029] In some embodiments, the rotating member 2 further comprises a toner feeding roller 22 in contact with the developing roller 21, the toner feeding roller 22 is also arranged to rotate along a rotation axis parallel to the first direction, and is used to supply toner to the developing roller 21, specifically, the toner feeding roller 22 comprises a toner feeding roller shaft 221 and a toner feeding layer 222 coated on the toner feeding roller shaft 221, along the first direction, the toner feeding roller shaft 221 protrudes from both ends of the toner feeding layer 222, thus, the toner feeding roller shaft 221 can penetrate the toner feeding layer 222 along the first direction (as shown by the toner feeding roller shaft in the dashed line in Figure 7 ), or can protrude from both ends of the toner feeding layer 222 (as shown by the toner feeding roller shaft in the solid line in Figure 7 ).

[0030] In some embodiments, the rotating member 2 further comprises a stirring frame 23 rotatably arranged in the toner containing cavity 10, the stirring frame 23 is also arranged to rotate along a rotation axis parallel to the first direction, when the developing cartridge 100 develops, the stirring frame 23 stirs the toner in the toner containing cavity 10, on the one hand, it can prevent the toner from caking, and on the other hand, it can supply the toner to the toner feeding roller 22.

[0031] As shown in Figure 1 and Figure 3 ​As shown, the developing cartridge 100 also includes an end cap 1a, a first bracket 1b, and a second bracket 1c. The end cap 1a is fixedly connected to the housing 1 and is used to protect the components between the end cap 1a and the housing 1. The first bracket 1b and the second bracket 1c are both fixedly connected to the housing 1. Along the first direction, the first bracket 1b and the second bracket 1c are arranged at intervals opposite to each other. One end of the developing roller shaft 211 passes through the first bracket 1b and is supported, while the other end of the developing roller shaft 211 is supported by the second bracket 1c.

[0032] In some embodiments, one end of the powder feeding roller 221 passes through the first bracket 1b and is supported, while the other end of the powder feeding roller 221 is supported by the housing 1; however, the first bracket 1b may also be configured to support only the developing roller 211 or the powder feeding roller 221, in which case the powder feeding roller 221 or the developing roller 211 not supported by the first bracket 1b may be supported by the end cap 1a.

[0033] (Drive force transmission within the developing chamber)

[0034] Furthermore, the developing cartridge 100 also includes a driving force receiver 43 and a driving force transmission assembly 45. The driving force receiver 43 is exposed from the end cover 1a and is used to receive driving force from the imaging device. The driving force transmission assembly 45 is used to transmit the driving force of the driving force receiver 43 to the rotating member 2 to drive the rotating member 2 to rotate. In the following text, along the first direction, the end where the driving force receiver 43 is provided is referred to as the driving end / left end, and the end opposite to the driving end is referred to as the non-driving end / right end. The first direction can also be referred to as the longitudinal direction.

[0035] like Figure 3 As shown, the driving force transmission assembly 45 includes a first transmission member 451, a second transmission member 452, a third transmission member 453, and a fourth transmission member 454. The second transmission member 452 is coaxially arranged with the developing roller 21, the third transmission member 453 is coaxially arranged with the powder feeding roller 22, and the fourth transmission member 454 is coaxially arranged with the stirring frame 23. The first transmission member 451 is coaxially arranged with the driving force receiving member 43, and the first transmission member 451 is also used to transmit the driving force of the driving force receiving member 43 to the second transmission member 452, the third transmission member 453, and the fourth transmission member 454. In this way, the developing roller 21, the powder feeding roller 22, and the stirring frame 23 can all be driven to rotate.

[0036] In some embodiments, the drive force transmission assembly 45 further includes at least one intermediate transmission element 455, thereby effectively improving the overall design freedom of the drive force transmission assembly 45 and the developing cartridge 100.

[0037] like Figure 3As shown, the developing cartridge 100 further comprises a support protrusion 1d for supporting the driving force receiving member 43 and / or the first transmission member 451, which protrudes from the housing 1 in a direction away from the non-driving end, and which can be arranged on the housing 1 or on the first support 1b.

[0038] (the powder discharge blade)

[0039] The powder discharge blade 3 comprises a blade holder 31 and a blade 32 connected with each other, wherein the blade holder 31 is fixedly installed on the housing 1 through a fixing portion arranged therein, and the blade 32 is installed on the blade holder 31 and is in contact with the developing roller 21 / developing layer 212 for adjusting the thickness of the carbon powder layer on the surface of the developing layer 212, and specifically, the blade 32 comprises a first portion 321 fixed on the blade holder 31 and a second portion 322 extending from the first portion 321 and being in contact with the developing roller 21 / developing layer 212.

[0040] Preferably, the powder discharge blade 3 is fixed by screws, and the fixing portion is a through hole 33 arranged on the blade holder 31, and correspondingly, the housing 1 is provided with screw holes 123 for accommodating the screws, which are opposite to the through holes 33 when the powder discharge blade 3 is installed on the housing 1, and hereinafter, along the first direction, the fixing portion arranged at the left end is referred to as the left fixing portion 33L, the fixing portion arranged at the right end is referred to as the right fixing portion 33R, the screw hole opposite to the left fixing portion 33L is referred to as the left screw hole 123L, and the screw hole opposite to the right fixing portion 33R is referred to as the right screw hole 123R; in other realizable modes, the fixing portion 33 can also be a barb, a magnet or the like arranged on the blade holder 31, as long as the powder discharge blade 3 can be fixed; along the first direction, the two fixing portions 33 are arranged at intervals.

[0041] In some embodiments, the powder discharge blade 3 further comprises a bent portion 3222 extending from the second portion 322 for improving the stability of the contact between the blade 32 and the developing roller 21 / developing layer 212, and the bent portion 3222 is opposite to the carbon powder bearing area S1; along the first direction, the two ends of the bent portion 3222 are misaligned with the two ends of the second portion 322, so that at the driving end and the non-driving end, a gap 3221 is formed between the bent portion 3222 and the second portion 322, and thus, the excess carbon powder carried by the developing layer 212 can enter the gap 3221, which is beneficial to prevent the accumulation of carbon powder and reduce the rotation resistance of the developing roller 21.

[0042] (installation of the powder feeding roller)

[0043] Figure 4 is a disassembly view of the powder feeding roller and the bottom shell after being separated.

[0044] As described above, the powder feeding roller 22 is used to supply toner to the developing roller 21. Preferably, the powder feeding layer 222 is made of a porous material such as a sponge, so that the powder feeding layer 222 can be elastically deformed relative to the powder feeding roller shaft 221, or in other words, the maximum diameter of the powder feeding roller 22 can be reduced. For this purpose, the powder feeding roller 22 of the present invention can be installed in the following manner.

[0045] like Figure 4 As shown, the housing 1 also includes a first sidewall 12a and a second sidewall 12b that are spaced apart from each other along a first direction. The toner receiving cavity 10 is located between the first sidewall 12a and the second sidewall 12b. The first sidewall 12a is provided with a first through hole 121, and the second sidewall 12b is provided with a second through hole 122. The size of one of the first through hole 121 and the second through hole 122 is larger than the size of the other. In this way, the toner feeding roller 22 can be inserted into the toner receiving cavity 10 along the first direction through the through hole with the larger size. Subsequently, the toner feeding roller shaft 221 passes through the through hole with the smaller size. An end seal 44 can also be installed on the side with the larger through hole. The end seal 44 can be used to seal the end of the toner feeding roller 22 and to support the toner feeding roller shaft 221.

[0046] (Developer cartridge seal)

[0047] Because toner has high fluidity, it is necessary to fully consider sealing the perimeter of the developing roller 21 to prevent toner leakage or flying out. The developing cartridge 100 also includes a longitudinal seal and a transverse seal. The longitudinal seal extends along the longitudinal direction and is used to seal the perimeter of the developing roller 21 in the direction intersecting with the longitudinal direction. The transverse seal extends along the transverse direction and is used to seal the developing roller 21 at the two longitudinal ends of the developing roller 21. The transverse direction intersects with the longitudinal direction. Along the transverse direction, the developing roller 21 is disposed at one end of the housing 1.

[0048] like Figure 3 As shown, the longitudinal seal includes a first seal 41 and a third seal 47 installed on the housing 1. The first seal 41 contacts the outer circumferential surface of the developing roller 21 / developing layer 212 to prevent toner leakage between the developing roller 21 and the housing 1. Preferably, the first seal 41 is provided as a sheet, and the bottom housing 12 has a mounting portion 12c for installing the first seal 41. The third seal 47 is disposed between the housing 1 and the toner discharge blade 3 to prevent toner leakage between the housing 1 and the toner discharge blade 3.

[0049] like Figure 5As shown, the transverse seal includes a third seal 46L (also referred to as "left seal") and a fourth seal 46R (also referred to as "right seal") mounted on the housing 1, the left seal 46L seals the left end of the developing roller 21 to prevent toner from leaking between the left end of the developing roller 21 and the housing 1, and the right seal 46R seals the right end of the developing roller 21 to prevent toner from leaking between the right end of the developing roller 21 and the housing 1.

[0050] By mounting the longitudinal seal and the transverse seal on the housing 1, the developing roller 21 is sealed on all sides, and further, to prevent toner from leaking between the gaps between adjacent longitudinal seals and transverse seals, auxiliary seals can also be provided between adjacent longitudinal seals and transverse seals, such as mounting a sponge between adjacent longitudinal seals and transverse seals, or injecting sealant between adjacent longitudinal seals and transverse seals, etc.

[0051] Depending on the type of toner, the materials used for the left seal 46L and the right seal 46R can also be different, for example, when the housing 1 contains non-magnetic toner, the left seal 46L and the right seal 46R can use elastic seals such as sponge, felt, etc., and preferably more wear-resistant felt, when the housing 1 contains magnetic toner, the left seal 46L and the right seal 46R can use magnetic seals such as magnetic felt.

[0052] Regardless of the material of the left seal 46L and the right seal 46R, after the developing cartridge 100 is assembled, in the first direction, the developing roller 21 will be supported by the first support 1b, the left seal 46L, the right seal 46R, and the second support 1c, wherein the developing roller shaft 211 is supported by the first support 1b and the second support 1c, and the developing layer 212 is supported by the left seal 46L and the right seal 46R; the toner feed roller 22 / toner feed roller shaft 221 is also supported by at least one of the first support 1b and the end seal 44, and at least one of the side wall of the housing and the second support 1c.

[0053] As described above, due to the presence of the left seal 46L and the right seal 46R, in the first direction, the developing roller 21 / developing layer 212 will be divided into a toner carrying area S1 and a non-toner carrying area S2, as Figure 3 As shown, the two non-toner carrying areas S2 are located on both sides of the toner carrying area S1, and in the present application, by adjusting the positions of the left seal 46L and the right seal 46R in the first direction, the size n of the toner carrying area S1 in the first direction is adjusted to be greater than the size m of the non-toner carrying area S2 in the first direction, so that the toner carrying area S1 is larger than the non-toner carrying area S2. Figure 7The size n of the carbon powder bearing area S1 in the first direction is controlled between 216 mm and 219.5 mm. If the size n of the carbon powder bearing area S1 in the first direction is less than 216 mm, the imaging medium will not be fully developed. If the size n of the carbon powder bearing area S1 in the first direction is greater than 219.5 mm, a color edge will appear in the non-imaging area of the imaging medium, which means that there is carbon powder in the non-imaging area of the imaging medium. The size n of the carbon powder bearing area S1 in the first direction is preferably 218 mm to 219 mm, so as to further improve the imaging quality.

[0054] As shown in Figure 2 When the developing cartridge 100 is developing, the developing roller 21 rotates in the direction r. The developing roller 21 and the first sealing member 41 have a contact position P3. Upstream of the contact position P3 in the rotation direction r, an exposed space S3 is formed between the developing roller 21 and the first sealing member 41 / the mounting portion 12c. Further, to prevent carbon powder from floating out of the exposed space S3, the developing cartridge 100 further comprises a second sealing member 42 arranged adjacent to the first sealing member 41. The second sealing member 42 also extends in the first direction, and the second sealing member 42 and the mounting portion 12c are connected to each other. In a direction perpendicular to the longitudinal direction, the second sealing member 42 is farther away from the carbon powder containing cavity 10 than the mounting portion 12c.

[0055] It can be implemented that the second sealing member 42 can be a component attached to the bottom shell 12, or can be integrally formed with the bottom shell 12, as long as the second sealing member 42 can cover at least part of the exposed space S3. Therefore, the second sealing member 42 can also be referred to as a cover member. Preferably, the second sealing member 42 is integrally formed with the housing 1 / the bottom shell 12. In this way, the mounting step of the second sealing member 42 can be omitted, and the second sealing member 42 will not be separated from the bottom shell 12.

[0056] (Positions of left and right sealing members)

[0057] As shown in Figure 5 and Figure 6A The developing cartridge 100 further comprises a left glue injection channel 14L and a right glue injection channel 14R arranged on the housing 1. In a direction intersecting the first direction, the left glue injection channel 14L and the right glue injection channel 14R both penetrate the housing 1 / the bottom shell 12. Sealant can be injected between the longitudinal sealing member and the transverse sealing member through the glue injection channels 14L / 14R.

[0058] In the first direction, the left glue injection channel 14L and the right glue injection channel 14R are respectively arranged at two ends of the housing 1. The left glue injection channel 14L has a left outflow port 14L1 facing the inner side and a left inflow port 14L2 facing the outer side (as shown in Figure 8As shown), the right injection channel 14R has an inward-facing right outlet 14R1 and an outward-facing right inlet (not shown). At the left end of the housing 1, sealant flows in through the left inlet 14L2 and flows out through the left outlet 14L1. At the right end of the housing 1, sealant flows in through the right inlet and flows out through the right outlet 14R1.

[0059] After the developing roller 21 is installed, the left outlet 14L1 and the right outlet 14R1 are located at both ends of the developing layer 212, respectively. Along the direction intersecting with the first direction, a left mounting surface 124L for installing the left seal 46L is provided between the left outlet 14L1 and the left screw hole 123L, and a right mounting surface 124R for installing the right seal 46R is provided between the right outlet 14R1 and the right screw hole 123R. Along the first direction, the left mounting surface 124L has a left edge 126L located on the rightmost side, and the right mounting surface 124R has a right edge 126R located on the leftmost side.

[0060] Continue as Figure 5 As shown, the left seal 46L is elongated and has a first surface 46L1 and a second surface 46L2 that are spaced apart from each other in a first direction. The first surface 46L1 is closer to the right end of the housing 1 than the second surface 46L2. The right seal 46R is elongated and has a third surface 46R1 and a fourth surface 46R2 that are spaced apart from each other in a first direction. The third surface 46R1 is closer to the left end of the housing 1 than the fourth surface 46R2. Furthermore, the left seal 46L also has a first end 46L3 located between the first surface 46L1 and the second surface 46L2, and the right seal 46R also has a second end 46R3 located between the third surface 46R1 and the fourth surface 46R2.

[0061] When both the left seal 46L and the right seal 46R are installed on the housing 1, the first surface 46L1 and the third surface 46R1 are opposite to each other. When the powder feeding roller 22 is installed on the housing 1, the first surface 46L1 is opposite to the powder feeding roller 22 / powder feeding layer 222, and the third surface 46R1 is also opposite to the powder feeding roller 22 / powder feeding layer 222.

[0062] In some embodiments, the first end 46L3 is also opposite to at least a portion of the left outlet 14L1, and the second end 46R3 is also opposite to at least a portion of the right outlet 14R1. In this way, the sealant injected through the left injection channel 14L can flow between the left seal 46L and the housing 1, and the sealant injected through the right injection channel 14R can flow between the right seal 46R and the housing 1. This not only improves the sealing performance between the two seals and the first seal 41, but also allows the two seals to be bonded to the housing 1, effectively preventing the two seals from lifting and causing a deterioration in the sealing effect.

[0063] In some embodiments, the developing cartridge 100 further comprises a left protrusion 15L and a right protrusion 15R provided on the housing 1, the left protrusion 15L is located at the left side of the left flow outlet 14L1 and the right protrusion 15R is located at the right side of the right flow outlet 14R1 along the first direction, that is, the two glue injection channels are located between the two protrusions, when the first seal 41 is installed, the first seal 41 can pass over the left flow outlet 14L1 and the right flow outlet 14R1 and be supported by the left protrusion 15L and the right protrusion 15R respectively, and after the sealant is injected through the left glue injection channel 14L and the right glue injection channel 14R respectively, the first seal 41 can be positioned more stably on the housing 1.

[0064] In some embodiments, the left seal 46L is installed to the right side of the left protrusion 15L and the left seal 46L is close to the right edge 15L1 of the left protrusion 15L, so that the left protrusion 15L can also limit the left seal 46L to prevent the left seal 46L from moving to the left; the right seal 46R is installed to the left side of the right protrusion 15R and the right seal 46R is close to the left edge 15R1 of the right protrusion 15R, so that the right protrusion 15R can also limit the right seal 46R to prevent the right seal 46R from moving to the right.

[0065] It can be understood that the left glue injection channel 14L and the right glue injection channel 14R can be through holes formed on the housing 1 / the bottom shell 12, and can also be notches formed on the housing 1 / the bottom shell 12, as long as the sealant can be injected from the outside to the inside of the housing 1 / the bottom shell 12 through the left glue injection channel 14L and the right glue injection channel 14R.

[0066] The positional relationship of the left seal 46L, the left flow outlet 14L1 and the left screw hole 123L, and the positional relationship of the right seal 46R, the right flow outlet 14R1 and the right screw hole 123R are described below.

[0067] As shown in Figure 6A The center line of the left screw hole 123L is set as a first center line LL, the plane M is perpendicular to the first center line LL, a straight line d1 passing through the leftmost point P1 of the left flow outlet 14L1 and parallel to the first center line LL, and a straight line d2 passing through the right edge 15L1 of the left protrusion 15L and parallel to the first center line LL, the straight line d1 is located at the right side of the straight line d2 along the first direction, and the straight line d2 is located at the right side of the first center line LL; preferably, the straight line d2 is located at the right side of the left screw hole 123L, that is, the straight line d2 does not pass through the left screw hole 123L.

[0068] As shown in Figure 6BAs shown, the left screw hole 123L, the left flow outlet 14L1, and the second surface 46L2 of the left sealing member 46L are all projected to the plane M, and the leftmost point P1 of the left flow outlet 14L1 is located at least to the right of the first center line LL, and the second surface 46L2 of the left sealing member 46L is also located at least to the right of the first center line LL.

[0069] As shown, the left screw hole 123L, the left flow outlet 14L1, and the second surface 46L2 of the left sealing member 46L are all projected to the plane M, and the leftmost point P1 of the left flow outlet 14L1 is located at least to the right of the first center line LL, and the second surface 46L2 of the left sealing member 46L is also located at least to the right of the first center line LL.

[0070] In some embodiments, one of the straight line d2 and the straight line d4 can also pass through the center line of the screw hole 123 of the respective end, that is, the straight line d2 passes through the first center line LL of the left screw hole 123L, or the straight line d4 passes through the second center line LR of the right screw hole 123R, which can also achieve the purpose of the present application.

[0071] (Other descriptions)

[0072] As shown in FIG. 1, the developing cartridge 100 includes a rotating member 2, an end cover 1a, and a toner cartridge 1b. Figure 1 and Figure 3 As shown, the developing cartridge 100 further includes a driving force receiving member 43 and a driving force transmission assembly 45, wherein the driving force receiving member 43 is exposed from the end cover 1a for receiving driving force from the image forming device, the driving force transmission assembly 45 is used to transmit the driving force received by the driving force receiving member 43 to the rotating member 2 to drive the rotating member 2 to rotate, and the end cover 1a is also used to cover at least a part of the driving force transmission assembly 45 to protect the driving force transmission assembly 45.

[0073] Specifically, the driving force transmission assembly 45 comprises a first transmission member 451, a second transmission member 452, a third transmission member 453 and a fourth transmission member 454, the first transmission member 451 is coaxially arranged with the driving force receiving member 43 and is used to receive the driving force of the driving force receiving member 43, preferably, the first transmission member 451 is integrally formed with the driving force receiving member 43; the second transmission member 452 is mounted on the developing roller shaft 211 and is used to directly or indirectly receive the driving force from the first transmission member 451 to drive the developing roller 21 to rotate; the third transmission member 453 is mounted on the powder feeding roller shaft 221 and is used to directly or indirectly receive the driving force from the first transmission member 451 to drive the powder feeding roller 22 to rotate; the fourth transmission member 454 is mounted on the stirring frame and is used to directly or indirectly receive the driving force from the first transmission member 451 to drive the stirring frame to rotate.

[0074] In some embodiments, the driving force transmission assembly 45 can further comprise at least one intermediate transmission member 455, which is used to transmit the driving force between the respective transmission members, so that the transmission of the driving force is more stable and efficient, and further, the specific position of the intermediate transmission member 455 can be set according to the overall design requirements of the developing cartridge 100.

[0075] As shown in Figure 2 and Figure 8 The developing cartridge 100 further comprises a rib plate 13 arranged on the shell 1 / the bottom shell 12, the rib plate 13 is connected with the mounting portion 12c and is used to strengthen the strength of the shell 1 / the bottom shell 12, especially the strength of the mounting portion 12c, so as to prevent the mounting portion 12c from being deformed and further causing a gap between the first sealing member 41 mounted on the mounting portion 12c and the developing roller 21, resulting in carbon powder leakage from the gap.

[0076] Further, when the second sealing member 42 is integrally formed with the shell 1 / the bottom shell 12, the strength of the mounting portion 12c can be further strengthened, and thus the second sealing member 42 can also be referred to as a reinforcing member.

[0077] The end cover 1a and the first bracket 1b are fixedly connected with the shell 1, and the commonly used fixed connection modes can be clamping, bonding, magnetic connection, threaded connection and the like, and from the perspective of facilitating installation and disassembly, threaded connection is preferred.

[0078] Continuing as Figure 8As shown in the drawings, the end cover 1a is provided with an end cover hole 1a1, the first support 1b is provided with a support hole 1b1, and the shell 1 / the bottom shell 12 is provided with a boss 125 for forming an end screw hole 125a. In the first direction, the end screw hole 125a, the support hole 1b1 and the end cover hole 1a1 are opposite, and a screw passes through the end cover hole 1a1 and the support hole 1b1 into the end screw hole 125a, thereby realizing the fixed connection of the first support 1b and the end cover 1a to the shell 1 / the bottom shell 12.

[0079] As shown in the drawings, Figure 8 and Figure 9 As shown in the drawings, along the direction intersecting the first direction, the second seal 42 also overlaps the boss 125. In the case of injection molding of the shell 1 / the bottom shell 12, the thickness of the overlapping area S4 of the second seal 42 and the boss 125 is much greater than the thickness of other areas of the second seal 42, which makes the injection molding material required by the overlapping area S4 more, and thus may cause the end screw hole 125a to be deformed.

[0080] As shown in the drawings, Figure 9 To prevent the above-mentioned defects, the developing cartridge 100 of the utility model further comprises an empty portion 421 provided on the second seal 42, which overlaps the boss 125 along the direction intersecting the first direction. In the first direction, the thickness of the second seal 42 in the area where the empty portion 421 is located is less than the thickness of the area outside the empty portion 421. In this way, the thickness of the overlapping area S4 can be greatly reduced, and the risk of deformation of the end screw hole 125a can be effectively reduced.

[0081] Preferably, along the first direction, the size of the empty portion 421 is not less than the size of the end screw hole 125a, and along the radial direction of the end screw hole 125a (a direction perpendicular to the first direction), the size of the empty portion 421 is not less than the diameter of the end screw hole 125a.

[0082] (Beneficial effects)

[0083] As described above, along the first direction, the leftmost point P1 of the left flow outlet 14L1 is located at least on the right side of the first center line LL, and the rightmost point P2 of the right flow outlet 14R1 is located at least on the left side of the second center line LR, that is, along the direction intersecting / vertical to the first direction, the left flow outlet 14L1 and the left screw hole 123L are misaligned, and the right flow outlet 14R1 and the right screw hole 123R are also misaligned, along the first direction, the left flow outlet 14L1 and the right flow outlet 14R1 are located between the first center line LL and the second center line LR, and after the left seal 46L and the right seal 46R are installed, the left seal 46L is located at least on the right side of the first center line LL, and the right seal 46R is located at least on the left side of the second center line LR, that is, along the first direction, the left seal 46L and the right seal 46R are also located between the first center line LL and the second center line LR.

[0084] Thus, the following beneficial effects can be produced:

[0085] 1. The sealant can be prevented from flowing into the left screw hole 123L and the right screw hole 123R, causing the two screw holes to be blocked, resulting in the powder outlet knife 3 being unable to be stably fixed.

[0086] 2. In the direction intersecting / vertical to the first direction, the size of the left seal 46L and the size of the right seal 46R can both be lengthened, which is beneficial to improve the end sealing effect of the developing cartridge.

[0087] 3. As shown in Figure 7 , along the first direction, a left accommodating space S51 will be formed between the left seal 46L and the first support 1b, and a right accommodating space S52 will be formed between the right seal 46R and the second support 1c, so that even if carbon powder leaks out from the longitudinal ends of the developing roller 21, the leaked carbon powder can be accommodated by the left accommodating space S51 and the right accommodating space S52.

[0088] 4. As shown in Figure 6A , when viewed along the direction vertical to the first direction, the left flow outlet 14L1 is located within the range of the left mounting surface 124L, and the right flow outlet 14R1 is located within the range of the right mounting surface 124R, and in the case of having the above structure, the size of the left mounting surface 124L in the first direction and the size of the right mounting surface 124R in the first direction can both be lengthened, so that one of the first through hole 121 and the second through hole 122 having a larger size (referring to the radial direction size vertical to the first direction) will also become deeper in the first direction, and accordingly, the size of the end seal 44 in the first direction can also be lengthened, and the powder feeding roller shaft 221 will be able to be more stably supported.

[0089] 5. According to the 4th point, the size of the powder feeding layer 222 of the powder feeding roller 22 in the first direction can be reduced, so that the material cost of the powder feeding roller 22 can be reduced, and the amount of carbon powder transported by the powder feeding roller 22 to the developing roller 21 can also be reduced, which is beneficial to reducing the consumption of carbon powder.

[0090] 6. According to the 4th point, as shown in the figure, Figure 5 the left end of the powder feeding layer 222 of the powder feeding roller 22 is opposite to the left edge 126L of the rightmost left mounting surface 124L, and the right end of the powder feeding layer 222 of the powder feeding roller 22 is opposite to the right edge 126R of the leftmost right mounting surface 124R along the first direction. In the case that the size of the powder feeding layer 222 of the powder feeding roller 22 in the first direction remains unchanged, the size of the left mounting surface 124L in the first direction and the size of the right mounting surface 124R in the first direction are both lengthened, and the movement amount of the powder feeding roller 22 in the first direction can be reduced.

[0091] 7. By contacting the outer circumferential surface of the developing roller 21 / developing layer 212 with the left sealing member 46L and the right sealing member 46R respectively, the distance between the first surface 46L1 and the third surface 46R1 along the first direction will define the size n of the carbon powder carrying area S1. As described above, through the above arrangement, the size n can be controlled between 216mm-219.5mm, and in the existing product, the size of the carbon powder carrying area is between 221mm-223mm. It can be seen that the size n in the present application is shortened.

[0092] In the case that the developing cartridge 100 involved in the present application is used for desktop imaging equipment, it is well known that the imaging medium used by desktop imaging equipment is generally A4 standard or letter standard, and the size of the imaging medium of the A4 standard is 210mm*297mm, and the size of the imaging medium of the letter standard is 215.9mm*279.4mm.

[0093] Whether the imaging equipment uses the imaging medium of the A4 standard or the imaging medium of the letter standard, the amount of carbon powder carried by the developing roller 21 in the developing cartridge 100 involved in the present application can be reduced, as shown in the figure, Figure 7 the carbon powder carrying area S1 can be divided into a developing area S11 and a non-developing area S12, and along the first direction, the two non-developing areas S12 are respectively located at both ends of the developing area S11. Compared with the existing product, in the case that the size of the developing area S11 remains unchanged, it is obvious that the size of the non-developing area S12 of the developing roller 21 in the developing cartridge 100 involved in the present application is reduced. Therefore, the technical solution of the present application can produce:

[0094] In the first aspect, the risk of the toner carried by the non-development area S12 being supplied to the photosensitive drum can be reduced, and accordingly, the risk of the toner carried by the non-development area S12 reaching the imaging medium can be reduced, and the imaging quality can be effectively improved.

[0095] In the second aspect, generally, after the toner carried by the developing roller 21 is supplied to the surface of the photosensitive drum, although most of the toner will be transferred to the imaging medium, there will always be a small amount of toner remaining on the surface of the photosensitive drum, and the remaining toner will be cleaned by the cleaning system and become waste toner. For the non-development area S12, the toner carried therein will not participate in development at all, and the toner supplied to the surface of the photosensitive drum from the non-development area S12 will be completely cleaned, and thus, the larger the non-development area S12, the greater the amount of toner wasted. Obviously, the amount of toner wasted by the developing cartridge 100 according to the technical solution of the present application can be greatly reduced.

[0096] In the third aspect, the abrasion of the photosensitive drum by toner in the area outside the developing area S11 of the developing roller 21 can be reduced.

[0097] 8. It is known that the developing roller 21 is a cylinder extending in the first direction, and the longitudinal dimension of the developing roller 21 is much greater than the radial dimension of the developing roller 21. When the developing roller 21 is installed in the housing 1, since only the two longitudinal ends of the developing roller 21 are supported, the middle area of the developing roller 21 will naturally sag from a microscopic point of view. If the middle area of the developing roller 21 can be supported, the stability of the developing roller 21 during rotation can be improved.

[0098] However, in view of the structure of the developing cartridge, as shown in Figure 7 the middle area of the developing roller 21 cannot be supported, but in the developing cartridge 100 according to the present application, as described above, the developing roller 21 is supported by the first support 1b, the left sealing member 46L, the right sealing member 46R, and the second support 1c in the first direction, and the first support 1b and the second support 1c support the developing roller shaft 211, and the left sealing member 46L and the right sealing member 46R support the developing layer 212, and the left sealing member 46L and the right sealing member 46R are located between the first center line LL and the second center line LR, or in other words, the left sealing member 46L is closer to the center line L0 (perpendicular to the first direction) of the toner carrying area S1 than the first center line LL, and the right sealing member 46R is closer to the center line L0 than the second center line LR. Compared with the existing product, the developing roller 21 according to the present application can be more stably supported, and the vibration amplitude of the developing roller 21 during rotation can be greatly reduced, and thus, the imaging quality can be effectively improved.

[0099] Based on the inventive concept of the utility model, when the leftmost point P1 of the left flow outlet 14L1 is located at the right side of the left screw hole 123L and the rightmost point P2 of the right flow outlet 14R1 is located at the left side of the right screw hole 123R, the above beneficial effects can be more obviously embodied.

[0100] Preferably, the second surface 46L2 of the left seal 46L is in contact with the right side edge 15L1 of the left protrusion 15L, and the fourth surface 46R2 of the right seal 46R is in contact with the left side edge 15R1 of the right protrusion 15R, so that the left seal 46L and the right seal 46R can be more stably installed.

[0101] Preferably, the first surface 46L1 of the left seal 46L is flush with the left edge 126L at the rightmost side of the left mounting surface 124L, and the third surface 46R1 of the right seal 46R is flush with the right edge 126R at the leftmost side of the right mounting surface 124R, so that the size n of the toner carrying area S1 can be more effectively controlled.

[0102] Although the size n of the toner carrying area S1 can be adjusted by only adjusting the position of the first surface 46L1 of the left seal 46L and the position of the third surface 46R1 of the right seal 46R in the first direction, that is, the positions of the second surface 46L2 of the left seal 46L and the fourth surface 46R2 of the right seal 46R in the first direction remain unchanged, and the size of the existing left seal and the size of the existing right seal are enlarged in the first direction, but since the left seal 46L and the right seal 46R are both in contact with the developing layer 212, and the material of the left seal 46L and the right seal 46R has a relatively large friction coefficient, the left seal 46L and the right seal 46R with the enlarged size in the first direction not only cause a significant increase in the friction force when the developing roller 21 rotates, but also increase the material cost of the left seal 46L and the right seal 46R, therefore, it is more beneficial to keep the left seal 46L and the right seal 46R in the first direction unchanged and to make the left seal 46L and the right seal 46R as a whole at least between the first center line LL and the second center line LR.

[0103] 9. The developing cartridge 100 further comprises a second seal 42 formed integrally with the shell 1 / the bottom shell 12 to prevent toner from escaping from the exposed space S3 formed between the developing roller 21 and the first seal 41 / the mounting portion 12c, compared with the anti-toner flying sheet formed separately from the bottom shell 12 in the prior art, obviously, the second seal 42 formed integrally with the shell 1 / the bottom shell 12 is used to replace the anti-toner flying sheet, which not only saves material cost, but also reduces labor cost.

[0104] 10. The second seal 42 is formed integrally with the shell 1 / the bottom shell 12, which can enhance the strength of the mounting portion 12c.

[0105] 11. The developing cartridge 100 further comprises a rib plate 13 arranged on the housing 1 / base 12 to enhance the strength of the housing 1 / base 12, especially the strength of the mounting portion 12c, to prevent the mounting portion 12c from being deformed, thereby avoiding the gap between the first seal 14 mounted on the mounting portion 12c and the developing roller 21, which results in the leakage of toner from the gap.

[0106] 12. Since the second seal 42 overlaps with the boss 125 for forming the end screw hole 125a, the thickness of the overlapping area S4 is much greater than the thickness of other areas of the second seal 42, so that the overlapping area S4 requires more injection molding material, thereby easily causing the end screw hole 125a to be deformed, therefore, the developing cartridge 100 involved in the utility model further comprises an empty portion 421 arranged on the second seal 42, along the first direction, the thickness of the second seal 42 in the area where the empty portion 421 is located is less than the thickness of the area outside the empty portion 421, so that the thickness of the overlapping area S4 of the second seal 42 and the boss 125 is greatly reduced, and the risk of the end screw hole 125a being deformed can be effectively reduced.

Claims

1. A developing cartridge, detachably mounted into an imaging device, characterized in that, The developing cartridge includes: The shell has a toner receiving cavity for containing toner. The developing roller, rotatably disposed in the housing, is used to carry toner and rotates along a rotation axis parallel to the longitudinal direction; The first seal, mounted on the housing, extends longitudinally and contacts the outer circumferential surface of the developing roller, to prevent toner from leaking between the developing roller and the housing; Along the rotation direction of the developing roller, the developing roller has a contact position with the first seal, and an exposed space is formed between the developing roller and the first seal upstream of the contact position; The second seal extends longitudinally and is disposed adjacent to the first seal, for covering at least a portion of the exposed space; The second seal is integrally formed with the housing.

2. The developing cartridge according to claim 1, characterized in that, The housing has a mounting portion for mounting a first seal, and the second seal and the mounting portion are connected to each other; In a direction perpendicular to the longitudinal direction, the second seal is further away from the toner receiving cavity than the mounting portion.

3. The developing cartridge according to claim 2, characterized in that, The developing chamber also includes ribs disposed on the housing, which are connected to the mounting portion to strengthen the housing.

4. The developing cartridge according to claim 1, characterized in that, The developing cartridge also includes a clearance portion disposed on the second sealing member; Along the longitudinal direction, the thickness of the second seal in the area where the clearance is located is less than the thickness in the area outside the clearance.

5. The developing cartridge according to claim 4, characterized in that, The developing cartridge includes a driving force receiver for receiving driving force from an imaging device, and a first bracket and an end cap disposed at the longitudinal end of the housing, wherein the driving force receiver is exposed through the end cap; The end cap is provided with an end cap hole, the first bracket is provided with a bracket hole, and the housing is provided with a boss for forming end screw holes. The screws pass through the end cap hole and the bracket hole in sequence and enter the screw hole, so that the end cap, the first bracket and the housing are fixedly connected; Along the direction intersecting the longitudinal direction, the clearance overlaps with the boss.

6. The developing cartridge according to claim 5, characterized in that, Along the longitudinal direction, the size of the clearance portion is not less than the size of the end screw hole.

7. The developing cartridge according to claim 5, characterized in that, Along the radial direction of the end screw hole, the size of the clearance portion shall not be less than the diameter of the end screw hole.

Images