CN105143994A - Cartridge - Google Patents

Abstract

The purpose of the present invention is to provide a cartridge with which a reduction in size can be achieved. A screw (82) is used to fix only a rear end of a cover main body (43) of a development cartridge (1) to a frame (31). A first fixation part (85) of the cover main body (43) is provided with localized press ribs (81) at a front lower end thereof. A head part (83) of the screw (82) presses against the press ribs (81). As a result, the head part (83) of the screw (82) presses more strongly against the front lower end of the first fixation part (85) than a rear upper end of the first fixation part (85). Accordingly, the front lower end of the cover main body (43) is pressed more strongly against the frame (31), and a front end of the cover main body (43) is fixed to the frame (31) without having to provide a configuration for fixing the cover main body (43) to the frame (31).

Description

box

technical field

The present invention relates to a cartridge used in an electrophotographic image forming apparatus.

As an electrophotographic image forming apparatus, there is known a laser printer including a drum cartridge having a photosensitive drum and a developing cartridge storing toner (for example, refer to Patent Document 1).

This developing cartridge includes: an agitator for agitating toner; and a gear mechanism unit for inputting driving force to the agitator. The gear mechanism unit includes: an agitator drive gear for driving the agitator; and a gear cover for protecting the agitator drive gear.

The gear cover is fixed to the frame of the developing cartridge by screws at the rear upper end, the rear lower end and the front end.

Patent Document 1: Japanese Unexamined Patent Publication No. 2006-72285

Contents of the invention

The problem to be solved by the invention

With regard to the developer cartridge described in Patent Document 1, further miniaturization has been studied.

Therefore, an object of the present invention is to provide a cartridge capable of downsizing.

Technical solutions for solving problems

(1) In order to achieve the above object, the cartridge of the present invention includes a housing, a transmission member, a transmission member, a cover, a first fixing member, and a thickness member. The housing is configured to accommodate developer. The conveying member is located in the frame and extends along the first direction, and is configured to convey the developer. The transmission member is located outside the housing, and is configured to transmit externally supplied driving force to the transmission member. The cover is configured to cover the transmission member, and has a fixing portion configured to be fixed to the frame. The first fixing member is configured to fix the cover to the frame by pressing the fixing portion. The thickness member has a thickness in the first direction.

In addition, the first fixing member has a pressing portion for pressing the fixing portion.

The frame body has a supporting part for supporting the fixing part.

The thickness member is partially located between the pressing part and the support part, and when the pressing part is projected in the first direction, the thickness member overlaps with the pressing part.

With such a configuration, the pressing portion of the first fixing member presses the fixing portion in a state where the thickness member is interposed between the supporting portion of the housing. At this time, the thickness member is partially interposed between the pressing portion and the supporting portion.

Therefore, the fixing portion is pressed so as to be biased toward either one of the portion interposed with the thickness member and the portion not interposed with the thickness member.

As a result, the cover can be largely moved in the first direction relative to the frame on the biased pressed side, so that the cover can be mounted without a structure for fixing the cover to the frame. The body is fixed to the frame.

As a result, the number of parts can be reduced and the size can be reduced.

(2) The pressing portion may have a first surface opposing the outer surface of the fixing portion in the first direction. Alternatively, the supporting portion may have a second surface opposite to the inner surface in the first direction of the fixing portion. In this case, the thickness member may be located between the outer surface of the fixing part in the first direction and the first surface and/or between the inner surface of the fixing part in the first direction and the second surface.

With such a configuration, when the thickness member is interposed between the outer surface in the first direction of the fixing portion and the first surface, the pressing portion of the first fixing member directly presses the thickness member.

Therefore, the pressing portion of the first fixing member moves the portion where the thickness member is interposed in the first direction more largely than the portion where the thickness member is not interposed.

As a result, the cover can be pressed more strongly against the frame on the side where the thickness member is interposed.

In addition, when the thickness member is interposed between the inner surface in the first direction of the fixing portion and the second surface, a difference in thickness to the thickness of the thickness member occurs between the inner surface in the first direction of the fixing portion and the second surface. the corresponding gap.

Therefore, the pressing portion of the first fixing member moves the portion not interposed by the thickness member more largely than the portion interposed by the thickness member in the first direction so as to narrow the gap.

As a result, the cover can be pressed more strongly against the frame on the side where the thickness member is not interposed.

(3) The thickness member may be located between the outer surface in the first direction of the fixing portion and the first surface.

With such a configuration, the cover can be moved more largely with respect to the frame on the side where the thickness member is interposed.

(4) The cartridge of the present invention may further include a developing roller having an axis extending in the first direction and configured to carry the developer. Alternatively, the developing roller may be supported by the first end of the frame in a second direction perpendicular to the axis. In this case, the first fixing member may be configured to fix the cover to the first end.

With such a structure, the cover can be fixed to the first end supporting the developing roller using the first fixing member.

Therefore, the cover can be reliably fixed to the first end, and the rigidity of the first end can be ensured.

(5) The cover may restrict movement of the developing roller in the first direction.

With such a structure, the movement of the developing roller in the first direction can be restricted by the cover.

Therefore, reduction in the number of parts can be achieved, and movement of the developing roller in the first direction can be restricted.

(6) The developing roller may include a shaft extending in the first direction. In this case, the cover body may have a main body part and a covering part configured to cover the peripheral surface of the shaft.

With such a configuration, the covering portion can be fixed to the frame together with the main body portion.

Therefore, the covering portion can be positioned on the housing with high precision.

(7) The cartridge of the present invention may further include a second fixing member located on the opposite side to the first fixing member with the covering portion interposed therebetween.

According to such a structure, the covering part can be fixed to a frame more reliably by the 1st fixing member and the 2nd fixing member.

(8) The cartridge of the present invention may further include a detection member configured to be detected by an external detection mechanism. In this case, the detection member is supported in the second direction by the second end portion of the housing at a position spaced from the first end portion.

With such a configuration, the pressing force of the first fixing member on the fixing portion can be biased toward the second end portion side, and the detection member can be positioned on the housing by the cover.

As a result, the number of components can be reduced, and the detection member can be positioned on the housing with high precision.

(9) The cover may have a restricting portion located on the outside of the detection member in the first direction for restricting the movement of the detection member to the outside in the first direction. In this case, the thickness member may be located on a straight line connecting the first fixing member and the regulation portion.

With such a configuration, it is possible to reliably bias the pressing force of the first fixing member on the fixing portion to the side where the restricting portion is arranged.

Therefore, the detection member can be reliably positioned on the housing.

(10) Two thickness members may be arranged so as to sandwich a straight line connecting the first fixing member and the regulation portion.

With such a configuration, it is possible to more reliably bias the pressing force of the first fixing member on the fixing portion toward the side where the restricting portion is arranged.

Therefore, the detection member can be positioned on the housing more reliably.

(11) The cartridge of the present invention may further include a coupling configured to receive a driving force supplied from the outside. In this case, the coupling may be located between the first fixing member and the restricting portion.

With such a structure, the coupling can be positioned on the frame by the cover.

As a result, the number of components can be reduced, and the coupling can be positioned on the frame with high precision.

(12) The thickness member may be integrated with the cover body.

With such a configuration, it is possible to further reduce the number of components.

(13) The main body of the cover may have a third surface opposing the outer surface in the first direction of the covering portion of the cover. In this case, the thickness member may be partially positioned between the outer surface in the first direction and the third surface of the covering portion.

With such a structure, when the thickness member is interposed between the outer surface in the first direction of the covering portion and the third surface, a gap between the outer surface of the covering portion in the first direction and the third surface is generated. The gap corresponding to the thickness.

Therefore, the pressing portion of the first fixing member moves the portion not interposed by the thickness member more largely than the portion interposed by the thickness member in the first direction so as to narrow the gap.

As a result, the cover can be largely moved in the first direction relative to the frame on the side where the thickness member is not interposed.

Invention effect

According to the cartridge of the present invention, the number of parts can be reduced and the size can be reduced.

Description of drawings

FIG. 1 is a central cross-sectional view of a developer cartridge as one embodiment of the cartridge of the present invention.

Fig. 2 is a central sectional view of a printer using the developing cartridge of Fig. 1 .

Fig. 3 is a perspective view viewed from the upper left of the developing cartridge shown in Fig. 1 .

Fig. 4 is an exploded perspective view viewed from the lower left side of the developing cartridge shown in Fig. 3 .

Fig. 5 is a perspective view viewed from the right rear of the gear cover shown in Fig. 4 .

Fig. 6 is a left side view of the developing cartridge shown in Fig. 3, showing a state where screws are removed.

Fig. 7 is a perspective view viewed from the lower left side of the developing cartridge shown in Fig. 3, showing a state in which upper screws are removed.

Fig. 8 is an explanatory diagram illustrating that the detection gear is exposed from the confirmation window, showing a state before the detection gear rotates.

FIG. 9 is an explanatory diagram illustrating that the detection gear is exposed from the confirmation window, and shows a state in which the detection gear is rotated.

FIG. 10 is an explanatory diagram illustrating a first modified example of the present invention.

FIG. 11 is an explanatory diagram illustrating a second modified example of the present invention.

FIG. 12 is an explanatory diagram illustrating a third modified example of the present invention.

FIG. 13 is an explanatory diagram illustrating a fourth modified example of the present invention.

FIG. 14 is an explanatory diagram illustrating a fifth modified example of the present invention.

FIG. 15 is an explanatory diagram illustrating a sixth modification example of the present invention.

Fig. 16 is an explanatory view for explaining a seventh modified example of the present invention, Fig. 16A shows a crimped part before crimping, and Fig. 16B shows a crimping part after crimping.

Detailed ways

1. Outline of developing cartridge

As shown in FIG. 1 , a developer cartridge 1 as an example of a cartridge is configured to be attached to or detached from a drum cartridge 18 described later. The developing cartridge 1 includes a developing roller 2 , a supply roller 3 , a layer thickness regulating blade 4 , and a toner storage portion 5 .

In addition, in the following description, when referring to the direction of the developer cartridge 1, the state where the developer cartridge 1 is placed horizontally is used as a reference of up and down. That is, the upper side of the paper surface of FIG. 1 is the upper side, and the lower side of the paper plane is the lower side. In addition, the right side of the paper surface of FIG. 1 is the front, and the left side of the paper surface of FIG. 1 is the rear side. In addition, when viewing the developing cartridge 1 from the front, it is set as the reference|standard of left and right. That is, the near side of the paper in FIG. 1 is the left side, and the rear side of the paper is the right side. The left-right direction is an example of the first direction. The front-back direction is an example of the second direction.

The developing roller 2 is rotatably supported by a rear end portion, which is an example of a first end portion, of the developing cartridge 1 . The developing roller 2 has a substantially cylindrical shape extending in the left-right direction. That is, the developing roller 2 has a center axis A extending in the left-right direction. The developing roller 2 is in contact with a front lower end portion of a photosensitive drum 19 which will be described later.

The supply roller 3 is disposed in front of and below the developing roller 2 . The supply roller 3 is rotatably supported by the developer cartridge 1 . The supply roller 3 has a substantially cylindrical shape extending in the left-right direction. The supply roller 3 is in contact with the front lower end portion of the developing roller 2 .

The layer thickness regulating blade 4 is arranged on the upper front of the developing roller 2 . The layer thickness regulating blade 4 is in contact with the front end portion of the developing roller 2 .

The toner storage portion 5 is arranged in front of the supply roller 3 and the layer thickness adjustment blade 4 . The toner storage unit 5 is configured to store toner as an example of a developer. The toner storage unit 5 includes an agitator 6 as an example of a transport member.

The agitator 6 is rotatably supported inside the toner storage portion 5 . The stirrer 6 extends in the left-right direction.

2. The overall structure of the printer

As shown in FIG. 2 , the printer 11 is an electrophotographic monochrome printer. The printer 11 includes a main body casing 12 , a process cartridge 13 , a scanning unit 14 , and a fixing unit 15 .

The main body casing 12 is formed in a substantially box shape. The main body casing 12 has an opening 16 , a top cover 17 , and a paper feed tray 24 .

The opening 16 is configured to penetrate the upper wall of the main body casing 12 in the vertical direction, and allows the passage of the process cartridge 13 .

The top cover 17 has a substantially plate shape. The top cover 17 is swingably supported by the upper wall of the main body casing 12 with its lower end as a fulcrum. The top cover 17 is configured to open or close the opening 16 . The top cover 17 includes a paper discharge tray 25 .

The paper discharge tray 25 is disposed on the front half of the top cover 17 . The paper discharge tray 25 is configured to be recessed downward from the upper end portion of the top cover 17 .

The paper feed tray 24 is arranged at the bottom of the main body casing 12 . Paper feed tray 24 is configured to place paper P thereon.

The process cartridge 13 is accommodated substantially in the vertical center of the main body casing 12 . The process cartridge 13 is configured to be attached to or detached from the main body casing 12 . The process cartridge 13 includes a developing cartridge 1 and a drum cartridge 18 .

The drum cartridge 18 includes a photosensitive drum 19 , a gridded corona charger 21 , and a transfer roller 20 .

The photosensitive drum 19 is rotatably supported by the rear end portion of the drum cartridge 18 . The photosensitive drum 19 has a substantially cylindrical shape extending in the left-right direction.

The gridded corona charger 21 is arranged above the photosensitive drum 19 at a distance from the photosensitive drum 19 .

The transfer roller 20 is disposed behind the photosensitive drum 19 . The transfer roller 20 is in contact with the rear end portion of the photosensitive drum 19 .

The scanning unit 14 is arranged in front of the process box 13 . The scanner unit 14 is configured to emit a laser beam based on image data toward the photosensitive drum 19 .

The fixing unit 15 is disposed above the process box 13 . The fixing unit 15 includes a heating roller 22 and a pressure roller 23 pressed against a rear upper end portion of the heating roller 22 .

In addition, when the printer 11 starts an image forming operation, the scorotron charger 21 uniformly charges the surface of the photosensitive drum 19 . Then, the scanning unit 14 exposes the surface of the photosensitive drum 19 to light. Thus, an electrostatic latent image based on the image data is formed on the surface of the photosensitive drum 19 .

In addition, the agitator 6 agitates the toner in the toner storage portion 5 and supplies the agitated toner to the supply roller 3 . The supply roller 3 supplies the toner supplied from the agitator 6 to the developing roller 2 . At this time, the toner is positively triboelectrically charged between the developing roller 2 and the supply roller 3 , and is carried on the developing roller 2 . The layer thickness adjusting blade 4 adjusts the toner carried on the developing roller 2 to a constant thickness.

Then, the toner carried on the developing roller 2 is supplied to the electrostatic latent image on the surface of the photosensitive drum 19 . Thus, a toner image is carried on the surface of the photosensitive drum 19 .

Paper P is fed one by one from the paper feed tray 24 between the photosensitive drum 19 and the transfer roller 20 by rotation of various rollers. The toner image on the photosensitive drum 19 is transferred to the paper P when the paper P passes between the photosensitive drum 19 and the transfer roller 20 .

Then, the paper P is heated and pressed while passing between the heat roller 22 and the pressure roller 23 . At this time, the toner image on the paper P is thermally fixed to the paper P. As shown in FIG. Then, the paper P is discharged to the paper discharge tray 25 .

3. Details of developing cartridge

As shown in FIGS. 3 and 4 , the developer cartridge 1 includes a frame 31 and a drive unit 32 as an example of a frame body.

(1) frame

The frame 31 has a substantially box shape extending in the left-right direction. Specifically, the frame 31 includes a left wall 33 , a right wall 34 , a front wall 35 , a lower wall 36 , and an upper wall 37 .

The left wall 33 is arranged at the left end of the frame 31 . The left wall 33 has a substantially rectangular plate shape in side view extending in the front-rear direction. The left wall 33 includes a first threaded portion 29 as an example of a support portion, a second threaded portion 30 as an example of a support portion, a first locking portion 57 , and a second locking portion 58 .

The first threaded portion 29 is disposed on the rear upper end portion of the left wall 33 . The first screwing portion 29 has a substantially cylindrical shape protruding leftward from the left surface of the left wall 33 . 29 A of left surfaces of the 1st screw part 29 are an example of a 2nd surface. The first screwing portion 29 has a screw hole 39A.

The screw hole 39A is recessed rightward from the left surface of the first screwing portion 29 . The screw hole 39A has a substantially circular shape in side view.

The second threaded portion 30 is disposed at the rear lower end portion of the left wall 33 . The second screwing portion 30 has a substantially cylindrical shape protruding leftward from the left surface of the left wall 33 . The second screw part 30 has a screw hole 39B and an engaging part 40 .

The screw hole 39B is recessed rightward from the left surface of the second screwing portion 30 . The screw hole 39B has a substantially circular shape in side view.

The engaging portion 40 is disposed at the left end portion of the second screwing portion 30 . The engaging portion 40 has a substantially cylindrical shape extending leftward from the peripheral portion of the screw hole 39B of the second screwing portion 30 .

The first locking portion 57 is disposed on the front upper end portion of the left wall 33 . The first locking portion 57 protrudes leftward from the left surface of the left wall 33 , and is bent upward at its left end. The first locking portion 57 has a substantially hook shape.

The second locking portion 58 is disposed at the front lower end portion of the left wall 33 . The second locking portion 58 protrudes downward from the lower surface of the cylindrical portion (not shown) where the agitator shaft is exposed. The second locking portion 58 has a substantially flat plate shape.

The right wall 34 is arranged at the left end of the frame 31 . Like the left wall 33 , the right wall 34 has a substantially rectangular plate shape in side view extending in the front-rear direction.

The front wall 35 is spanned between the front end of the left wall 33 and the front end of the right wall 34 . The front wall 35 has a substantially plate shape extending in the up-down direction.

The lower wall 36 is spanned between the lower end of the left wall 33 and the lower end of the right wall 34 . The lower wall 36 is bent and extends rearward from the lower end portion of the front wall 35 . The lower wall 36 has a substantially plate shape.

The upper wall 37 is disposed above the upper end of the left wall 33 , the upper end of the right wall 34 , and the upper end of the front wall 35 . The upper wall 37 has a substantially plate shape extending in the left-right direction. The peripheral portion of the upper wall 37 is fixed to the upper end portion of the left wall 33 , the upper end portion of the right wall 34 , and the upper end portion of the front wall 35 by welding or the like.

(2) Drive unit

As shown in FIG. 4 , the driving unit 32 includes a gear train 41 , a gear cover 38 as an example of a cover, and screws 82 .

(2-1) Gear train

The gear train 41 includes a development coupling 44 as an example of a coupling, a development gear 45, a supply gear 46, an intermediate gear 47, an agitator gear 48 as an example of a transmission member, and a detection device as an example of a detection member. gear 49.

(2-1-1) Development coupling

The development coupling 44 is rotatably supported by the upper end portion of the left wall 33 . The development coupling 44 is formed in a substantially cylindrical shape extending in the left-right direction. The development coupling 44 integrally has a first gear portion 50 , a second gear portion 51 , and a coupling portion 52 .

The first gear portion 50 is arranged at the right end portion of the development coupling 44 . The first gear portion 50 has a substantially disc shape having a thickness in the left-right direction. The first gear portion 50 has gear teeth over its entire peripheral surface.

The second gear portion 51 protrudes leftward from the left surface of the first gear portion 50 . The second gear portion 51 has a substantially cylindrical shape. The outer diameter of the second gear portion 51 is smaller than that of the first gear portion 50 . The central axis of the second gear portion 51 coincides with the central axis of the first gear portion 50 . The second gear portion 51 has gear teeth over its entire peripheral surface.

The coupling portion 52 is disposed radially inside the second gear portion 51 . The coupling portion 52 protrudes leftward from the left surface of the first gear portion 50 . The coupling portion 52 has a substantially cylindrical shape with a closed right end. The outer diameter of the coupling portion 52 is smaller than the inner diameter of the second gear portion 51 . In addition, the central axis of the coupling portion 52 coincides with the central axis of the first gear portion 50 . The coupling part 52 has a concave part 53 and a pair of convex parts 54 .

The recessed portion 53 is recessed rightward from the left surface of the coupling portion 52 . The concave portion 53 has a substantially circular shape in side view.

As shown in FIG. 7 , a pair of convex portions 54 respectively protrude radially inward from the radially inner peripheral surface of the concave portion 53 . The pair of convex portions 54 are arranged to face each other in the radial direction of the concave portion 53 . The pair of protrusions 54 each have a substantially prism shape extending in the left-right direction. The pair of protrusions 54 each have an inclined surface 54A.

The inclined surface 54A is the left surface of the convex part 54, and it inclines to the left as it goes counterclockwise when viewed from the left.

(2-1-2) Developing gear

As shown in FIG. 4 , the developing gear 45 is disposed behind and below the developing coupling 44 . The developing gear 45 has a substantially cylindrical shape extending in the left-right direction. The developing gear 45 is relatively non-rotatably supported by the left end portion of the rotating shaft 2A as an example of a shaft of the developing roller 2 . The developing gear 45 integrally has a gear portion 55 and a collar insertion portion 56 .

The gear part 55 is provided at the right end part of the developing gear 45, and is formed in the substantially disk shape which has thickness in the left-right direction. The gear portion 55 has gear teeth over its entire peripheral surface. The gear portion 55 meshes with the rear lower end portion of the first gear portion 50 of the developing coupling 44 .

The collar insertion portion 56 protrudes leftward from the left end portion of the gear portion 55 . The collar insertion portion 56 has a substantially cylindrical shape. The outer diameter of the collar insertion portion 56 is smaller than that of the gear portion 55 . The central axis of the collar insertion portion 56 coincides with the central axis of the gear portion 55 .

(2-1-3) Supply gear

The supply gear 46 has a substantially disc shape having a thickness in the left-right direction. The supply gear 46 is relatively non-rotatably supported by the left end portion of the rotation shaft 3A of the supply roller 3 . Gear teeth extending in the left-right direction are formed on the peripheral surface of the supply gear 46 over the entire circumference. The supply gear 46 meshes with the lower end portion of the second gear portion 51 of the development coupling 44 .

(2-1-4) intermediate gear

The intermediate gear 47 is arranged in front of the development coupling 44 . The intermediate gear 47 is rotatably supported by the left wall 33 . The intermediate gear 47 integrally has a large-diameter gear 47A and a small-diameter gear 47B.

The large-diameter gear 47A has a substantially disc shape having a thickness in the left-right direction. The large-diameter gear 47A has gear teeth over its entire peripheral surface. The large-diameter gear 47A meshes with the front end portion of the second gear portion 51 of the development coupling 44 .

The small-diameter gear 47B protrudes rightward from the right surface of the large-diameter gear 47A. The small-diameter gear 47B has a substantially cylindrical shape extending in the left-right direction. The outer diameter of the small-diameter gear 47B is smaller than that of the large-diameter gear 47A. The central axis of the small-diameter gear 47B coincides with the central axis of the large-diameter gear 47A. The small-diameter gear 47B has gear teeth over its entire peripheral surface.

(2-1-5) Agitator gear

The agitator gear 48 is disposed below the intermediate gear 47 . The agitator gear 48 has a substantially disc shape having a thickness in the left-right direction. The agitator gear 48 is relatively non-rotatably supported by the left end portion of the rotary shaft 6A of the agitator 6 . The agitator gear 48 has gear teeth over its entire circumference. The agitator gear 48 meshes with the lower end portion of the right end portion of the small-diameter gear 47B of the intermediate gear 47 .

(2-1-6) Detection gear

The detection gear 49 is arranged at the front and lower side of the intermediate gear 47 . The detection gear 49 is rotatably supported by a front end portion, which is an example of a second end portion, of the left wall 33 . The detection gear 49 includes a gear portion 49A and a shaft portion 49B.

The gear portion 49A is formed in a substantially semicircular plate shape having a thickness in the left-right direction. The gear portion 49A has gear teeth on its peripheral surface. The gear portion 49A meshes with the front lower end portion of the left end portion of the small-diameter gear 47B of the intermediate gear 47 . In other words, the detection gear 49 meshes with the small-diameter gear 47B of the intermediate gear 47 on the left side of the agitator gear 48 and on the right side of the large-diameter gear 47A of the intermediate gear 47 .

The shaft portion 49B is arranged at the radial center of the gear portion 49A. The shaft portion 49B has a substantially cylindrical shape extending in the left-right direction. The dimension in the left-right direction of the shaft portion 49B is longer than the dimension in the left-right direction of the gear portion 49A.

(2-2) Gear cover

The gear cover 38 includes a collar 42 as an example of a cover portion and a cover main body 43 as an example of a main body portion.

(2-2-3) Collar

The collar 42 includes a cylindrical portion 61 , a first fixing portion 62 , and a second fixing portion 63 .

The barrel portion 61 has a substantially cylindrical shape extending in the left-right direction with a closed left end. The inner diameter of the cylindrical portion 61 is slightly larger than the outer diameter of the collar insertion portion 56 of the developing gear 45 . The cylindrical portion 61 is fitted into the collar insertion portion 56 of the developing gear 45 so as to be relatively rotatable. That is, the cylindrical portion 61 covers the left end portion of the rotation shaft 2A of the developing roller 2 via the collar insertion portion 56 of the developing gear 45 . Thus, the collar 42 restricts the leftward movement of the developing roller 2 and the radial movement of the developing roller 2 . That is, the collar 42 positions the developing roller 2 to the frame 31 . Further, the collar 42 is positioned on the drum cartridge 18 when the developing cartridge 1 is mounted on the drum cartridge 18 . Thus, the collar 42 positions the developing roller 2 on the photosensitive drum 19 .

The first fixing portion 62 extends continuously upward from the right end portion of the cylindrical portion 61 . The first fixing portion 62 has a substantially flat plate shape. The first fixing portion 62 has an insertion hole 62A.

The insertion hole 62A penetrates the upper end portion of the first fixing portion 62 in the left-right direction. The insertion hole 62A has a substantially circular shape in side view. The insertion hole 62A overlaps with the screw hole 39A of the first screw part 29 .

The second fixing portion 63 continuously extends downward from the right end portion of the cylindrical portion 61 . The second fixing portion 63 has a substantially flat plate shape. The second fixing portion 63 has an insertion hole 63A.

The insertion hole 63A penetrates the lower end portion of the second fixing portion 63 in the left-right direction. The insertion hole 63A is formed in a substantially circular shape in side view. The inner diameter of the insertion hole 63A is larger than the outer diameter of the engaging portion 40 of the second screwing portion 30 . The insertion hole 63A accommodates the engaging portion 40 .

(2-2-3) Cover body

As shown in FIGS. 4 and 5 , the cover main body 43 has a substantially box shape with an open right end and a closed left end. The cover body 43 constitutes a cover together with the collar 42 . The cover body 43 is made of, for example, a hard resin material. The cover main body 43 has a collar exposure opening 71, a coupling exposure opening 72, an agitator gear exposure opening 73, a detection gear exposure opening 74, a confirmation window 75, an agitator gear restriction part 76, and a detection The gear restricting portion 77 , the first locking claw 78 , the second locking claw 79 , the first fixing portion 85 , and the second fixing portion 86 .

The collar exposing opening 71 is arranged at the rear end portion of the cover main body 43 . The collar exposing opening 71 penetrates the left wall of the cover main body 43 in the left-right direction. The collar exposure opening 71 has a substantially C-shape in side view with an open rear upper end. The inner diameter of the collar exposure opening 71 is larger than the outer diameter of the collar 42 .

The coupling exposure opening 72 is arranged at the upper front of the collar exposure opening 71 . The coupling exposing opening 72 penetrates the left wall of the cover main body 43 in the left-right direction. The coupling exposure opening 72 has a substantially circular shape in side view.

The agitator gear exposure opening 73 is disposed in front and lower than the coupling exposure opening 72 . The agitator gear exposure opening 73 penetrates the left wall of the cover main body 43 in the left-right direction. The agitator gear exposure opening 73 has a substantially circular shape in side view.

The confirmation window 75 is arranged in front of the agitator gear exposure opening 73 . The confirmation window 75 penetrates the left wall of the cover main body 43 in the left-right direction. The confirmation window 75 has a substantially triangular shape in side view. That is, the confirmation window 75 has a different shape from other openings of the cover body 43 , specifically, the collar exposure opening 71 , the coupling exposure opening 72 , the agitator gear exposure opening 73 , and the detection gear exposure opening 74 . Thus, the user can easily recognize the confirmation window 75 .

The detection gear exposure opening 74 is arranged at the front lower end portion of the cover main body 43 . The detection gear exposure opening 74 penetrates the peripheral wall of the cover main body 43 in the vertical direction. The detection gear exposure opening 74 has a substantially U-shaped front view with its right end open.

The agitator gear restricting portion 76 is disposed on the rear side of the detection gear exposure opening 74 on the lower side of the agitator gear exposure opening 73 . The agitator gear restricting portion 76 protrudes rightward from the inner surface of the left wall of the cover main body 43 . The agitator gear restricting portion 76 has a substantially prismatic shape. The agitator gear restricting portion 76 has a restricting protrusion 80 .

The restricting protrusion 80 is arranged on the upper end portion of the agitator gear restricting portion 76 . The restricting protrusion 80 protrudes rightward from the right surface of the agitator gear restricting portion 76 and extends in the front-rear direction.

The detection gear restricting portion 77 is arranged on the rear side of the confirmation window 75 on the front side of the agitator gear exposure opening 73 . The detection gear restricting portion 77 protrudes slightly to the right side from the inner surface of the left wall of the cover main body 43 . The detection gear restricting portion 77 has a substantially cylindrical shape.

The first locking claw 78 is arranged at the front upper end portion of the cover main body 43 . The first locking claw 78 is arranged inside the front peripheral wall of the cover main body 43 . The first locking claw 78 protrudes rightward from the inner surface of the left wall of the cover main body 43 , and bends downward at the right end thereof. That is, the first locking claw 78 has a substantially hook shape.

The second locking claw 79 is arranged at the lower end of the cover main body 43 . The second locking claw 79 is disposed below the agitator gear restricting portion 76 . The second locking claw 79 protrudes rightward from the right edge of the lower peripheral wall of the cover main body 43 , and is bent upward at its right end. That is, the second locking claw 79 is formed in a substantially hook shape.

The first fixing portion 85 is arranged at the rear upper end portion of the cover main body 43 . The first fixing portion 85 is recessed from the left surface of the cover main body 43 to the right side. The first fixing portion 85 has a substantially circular shape. The first fixing portion 85 includes an insertion hole 85A and a pair of two pressing ribs 81 as an example of a thickness member.

The insertion hole 85A is arranged substantially at the center in the radial direction of the first fixing portion 85 . The insertion hole 85A penetrates the first fixing portion 85 in the left-right direction. The insertion hole 85A has a substantially circular shape in side view.

As shown in FIG. 6 , a pair of pressing ribs 81 are arranged on the front and lower side of the insertion hole 85A. The pair of pressing ribs 81 are arranged at intervals from each other along the circumferential direction of the first fixing portion 85 . That is, the pair of pressing ribs 81 are respectively arranged partially forward and downward in the circumferential direction of the first fixing portion 85 . A pair of pressing ribs 81 respectively protrude leftward from the left surface of the first fixing portion 85 and extend in the radial direction of the first fixing portion 85 . The pair of pressing ribs 81 are respectively disposed so as to sandwich a straight line L1 passing through the center A1 of the insertion hole 85A of the first fixing portion 85 and the center A2 of the detection gear restricting portion 77 . In addition, the straight line L1 overlaps the development coupling 44 between the insertion hole 85A of the first fixing portion 85 and the detection gear restricting portion 77 . That is, the development coupling 44 is disposed between the insertion hole 85A of the first fixing portion 85 and the detection gear restricting portion 77 .

The second fixing parts 86 are respectively arranged at the rear lower end part of the cover main body 43 . The second fixing portion 86 is recessed from the left surface of the cover body 43 to the right side. The second fixing portion 86 has a substantially circular shape. The second fixing portion 86 has an insertion hole 86A.

The insertion hole 86A is arranged substantially at the center in the radial direction of the second fixing portion 86 . The insertion hole 86A penetrates the second fixing portion 86 in the left-right direction. The insertion hole 86A has a substantially circular shape in side view.

(2-4) screws

As shown in FIG. 7 , the screw 82 integrally includes a head portion 83 and a shaft portion 84 as an example of a pressing portion.

The head 83 is arranged at the left end of the screw 82 . The head portion 83 has a substantially disc shape. The right surface 83A of the head 83 is an example of the first surface.

The shaft portion 84 is disposed approximately at the center in the radial direction of the head portion 83 . The shaft portion 84 extends rightward from the right surface 83A of the head portion 83 . The shaft portion 84 has a substantially cylindrical shape extending in the left-right direction. The outer diameter of the shaft portion 84 is smaller than that of the head portion 83 . The shaft portion 84 has screw threads on its peripheral surface.

3. Assembled state of the gear cover

As shown in Figures 6 and 7, the cover body 43 covers the gear train 41, and the first locking claw 78 is locked to the first locking part 57, and the second locking claw 79 is locked to the second locking part 57. The fixed portion 58 is thus locked to the left wall 33 .

At this time, the cylindrical portion 61 of the collar 42 is inserted into the collar exposure opening 71 . The coupling portion 52 of the development coupling 44 is inserted into the coupling exposure opening 72 . The front lower end portion of the detection gear 49 is exposed from the detection gear exposure opening 74 .

In addition, the left end portion of the rotating shaft 6A of the agitator 6 is exposed from the agitator gear exposure opening 73 as viewed from the left.

In addition, when the developer cartridge 1 is a new product (unused), the detection gear 49 is not exposed in the confirmation window 75 when viewed from the left side. Accordingly, even if the operator visually checks the inside of the confirmation window 75 , the detection gear 49 cannot be seen. Moreover, it can be judged that the developing cartridge 1 is a new product (unused) based on the fact that the detection gear 49 cannot be seen in the confirmation window 75 .

In addition, although not shown in figure, the regulation protrusion part 80 is arrange|positioned at a slight distance from the left side of the lower end part of the agitator gear 48. As shown in FIG. In addition, the detection gear restricting portion 77 is disposed on the left side of the shaft portion 49B of the detection gear 49 .

Then, the cover main body 43 is fixed to the left wall 33 by screws 82 .

Specifically, the lower screw 82 as an example of the second fixing member is screwed to the second screwing portion 30 of the frame 31 through the insertion hole 86A of the second fixing portion 86 of the cover main body 43 .

In addition, the upper screw 82 as an example of the first fixing member is connected to the frame 31 via the insertion hole 85A of the first fixing portion 85 of the cover main body 43 and the insertion hole 62A of the first fixing portion 62 of the collar 42 . The first threaded portion 29 is threaded.

The upper screw 82 and the lower screw 82 interpose the cylindrical portion 61 of the collar 42 .

At this time, the right surface 83A of the head portion 83 of the upper screw 82 is in contact with the pressing rib 81 from the left at the front lower end portion. That is, when the head 83 is projected in the left-right direction, the upper screw 82 overlaps the pressing rib 81 .

As a result, the head portion 83 of the upper screw 82 presses the front lower end portion of the first fixing portion 85 having the pressing rib 81 to the right more strongly than when pressing the rear upper end portion of the first fixing portion 85 .

As a result, the front lower end portion of the cover main body 43 moves toward the frame 31 more largely than the rear upper end portion of the cover main body 43 .

4. The driver of the developing box

When a new (unused) developer cartridge 1 is installed in the main body casing 12, as shown in FIG. Accordingly, it is determined that the developing cartridge 1 is attached to the main body casing 12 .

The main body coupling 89 in the main body casing 12 is fitted into the coupling part 52 of the development coupling 44 so that it cannot rotate relatively.

The main body coupling 89 outputs the driving force from the main body housing 12 to the development coupling 44 . The driving force from the main body casing 12 is transmitted from the development coupling 44 to the agitator gear 48 and the detection gear 49 via the intermediate gear 47 .

Then, the agitator gear 48 rotates clockwise as viewed from the left. In addition, the detection gear 49 rotates clockwise as viewed from the left.

Then, the gear portion 49A of the detection gear 49 comes into contact with the actuator 90 again after being separated from the actuator 90 for a while.

Then, as shown in FIG. 9 , the detection gear 49 stops when the gear portion 49A is disengaged from the small-diameter gear 47B of the intermediate gear 47 .

Based on such ON and OFF of the actuator 90 , it is judged in the main body casing 12 that the developing cartridge 1 is a new product.

At this time, the detection gear 49 is exposed from the confirmation window 75 as viewed from the left.

Accordingly, the operator can see the detection gear 49 by visually checking the inside of the confirmation window 75 . Then, based on the fact that the detection gear 49 can be seen from the inside of the confirmation window 75, it can be judged that the developing cartridge 1 is an old product (used or in use).

5. Effect

(1) With this developing cartridge 1 , as shown in FIGS. 7 and 8 , the head portion 83 of the screw 82 presses the pressing rib 81 .

Accordingly, the head portion 83 of the screw 82 presses the front lower end portion of the first fixing portion 85 more strongly than when pressing the rear upper end portion of the first fixing portion 85 .

As a result, the front lower end portion of the cover main body 43 can be pressed more strongly against the frame 31 .

Thereby, the front-end|tip part of the cover main body 43 can be fixed to the frame 31, without providing the structure for fixing the cover main body 43 to the frame 31. FIG.

As a result, reduction in the number of components and miniaturization can be achieved.

(2) With this developing cartridge 1 , as shown in FIGS. 7 and 8 , the cover main body 43 can be fixed to the rear end portion of the frame 31 supporting the developing roller 2 with screws 82 .

Therefore, the cover main body 43 can be reliably fixed to the rear-end part of the frame 31, and the rigidity of the rear-end part of the developing cartridge 1 can be ensured.

(3) According to this developing cartridge 1, as shown in FIG. 4, the collar 42 which covers 2 A of rotating shafts can be fixed to the frame 31 together with the cover main body 43. As shown in FIG.

Therefore, the collar 42 can be positioned on the frame 31 with high precision.

In addition, the collar 42 is used when positioning the developing roller 2 on the photosensitive drum 19 .

With this developing cartridge 1 , the collar 42 can be fixed to the frame 31 together with the cover main body 43 by the screws 82 fixing the cover main body 43 to the rear end portion of the frame 31 .

Accordingly, the collar 42 can be positioned on the frame 31 with high precision, and the developing roller 2 can be positioned on the photosensitive drum 19 with high precision.

(4) With this developer cartridge 1 , as shown in FIG. 3 , the collar 42 can be fixed to the frame 31 more reliably by the upper screw 82 and the lower screw 82 .

(5) According to the developing cartridge 1 , the detection gear 49 can be pressed against the frame 31 by the cover main body 43 by biasing the pressing force of the screw 82 to the first fixing portion 85 forward.

As a result, the number of components can be reduced, and the detection gear 49 can be positioned on the frame 31 with high precision.

(6) According to the developing cartridge 1 , as shown in FIG. 6 , two pressing ribs 81 are arranged so as to sandwich the straight line L1 connecting the upper screw and the detecting gear restricting portion 77 .

Therefore, it is possible to more reliably bias the pressing force of the upper screw 82 on the first fixing portion 85 to the front where the detection gear restricting portion 77 is arranged.

Therefore, it is possible to more reliably press the detection gear 49 against the frame 31 .

In addition, in order to determine whether the developer cartridge 1 is old or new in the main body casing 2 , the detection gear 49 needs to be in contact with the actuator 90 reliably.

According to the developer cartridge 1, the number of components can be reduced, and the detection gear 49 can be positioned on the frame 31 with high precision.

Accordingly, it is possible to reliably bring the detection gear 49 into contact with the actuator 90 .

(7) With this developing cartridge 1 , as shown in FIG. 6 , the first fixing portion 85 of the cover main body 43 has the pressing rib 81 integrally on the left surface 85C thereof.

Therefore, further reduction in the number of components can be achieved.

(8) According to the developing cartridge 1 , as shown in FIG. 6 , the developing coupling 44 can be pressed against the frame 31 by the cover main body 43 .

As a result, the number of components can be reduced, and the development coupling 44 can be positioned on the frame 31 with high precision.

6. Variations

(1) In the above embodiment, the pressing rib 81 as an example of the thickness member is provided on the front lower end portion of the first fixing portion 85 , and the pressing rib 81 is pressed by the screw 82 . However, the thickness member is not particularly limited as long as the thickness of the first fixing portion 85 at the front and bottom of the screw 82 is thicker than the thickness of the first fixing portion 85 at the rear and upper side of the screw 82 .

(1-1) First modified example

As the thickness member, for example, as shown in FIG. 10 , a washer 101 whose front lower end portion is bent to the left may be used.

In addition, the thickness member does not need to be continuous in the circumferential direction like the gasket 101 . The thickness member may be, for example, a plate member disposed at the front lower end portion of the first fixing portion 85 . The plate member has a substantially plate shape having a thickness in the left-right direction.

(1-2) Second modified example

As the thickness member, for example, as shown in FIG. 11 , an inclined surface 102 formed on the front lower end portion of the first fixing portion 85 may be used. The inclined surface 102 inclines to the left as it goes forward and downward.

(2) In the above embodiment, the first fixing portion 85 has the pressing rib 81 as an example of the thickness member on the left surface 85C. However, the location where the thickness member is arranged is not particularly limited as long as it is between the seating surface of the screw 82 , that is, between the right surface 83A of the head 83 and the left surface 29A of the first screwing portion 29 .

(2-1) Third modified example

As shown in FIG. 12 , the first fixing portion 62 of the collar 42 may have a rib 108 as an example of a thickness member on a rear upper end portion of a right surface 62D thereof. The rib 108 protrudes rightward from the right surface 62D, and extends in a direction connecting the upper front and the lower rear.

In addition, the rib 108 of this modified example is located on a straight line L1 passing through the insertion hole 85A of the first fixing portion 85 and the detection gear restricting portion 77 .

Therefore, it is possible to reliably bias the pressing force of the screw 82 on the first fixing portion 85 toward the front and lower side where the detection gear restricting portion 77 is disposed.

As a result, the detection gear 49 can be reliably pressed against the frame 31 .

In addition, in this modified example, as the thickness member, for example, an inclined surface formed at the rear upper end portion of the right surface 62D of the first fixing portion 62 of the collar 42 may be used. The inclined surface inclines to the right as it goes upward and rearward.

(2-2) Fourth modified example

As shown in FIG. 13, the 1st screw part 29 may have the rib 110 which is an example of a thickness member in the rear upper end part of the left surface 29A. The rib 110 protrudes leftward from the left surface 29A, and extends in a direction connecting the upper front and the lower rear.

In addition, in this modified example, as the thickness member, for example, an inclined surface formed on the rear upper end portion of the left surface 29A of the first screwing portion 29 may be used. The inclined surface inclines to the left as it goes upward and rearward.

(2-3) Fifth modified example

As shown in FIG. 14 , the first fixing portion 85 has a rib 105 as an example of a thickness member on a rear upper end portion of a right surface 85D thereof. The rib 105 protrudes rightward from the right surface 85D, and extends in a direction connecting the upper front and the lower rear.

With this modified example, the rib 105 is interposed between the rear upper end portion of the right surface 85D of the first fixing portion 85 and the left surface 29A of the first screwing portion 29 . Thus, a gap corresponding to the thickness of the rib 105 is generated between the front lower end portion of the right surface 85D of the first fixing portion 85 and the left surface 29A of the first screwing portion 29 .

Therefore, the head portion 83 of the screw 82 makes the front lower end portion of the first fixing portion 85 not interposed with the rib 105 wider than the rear upper end portion of the first fixing portion 85 interposed with the rib 105 so as to narrow the gap. to move.

As a result, the cover main body 43 can be further pressed against the frame 31 at the front lower side where the rib 105 is not interposed.

In addition, in this modified example, the thickness member may be, for example, an inclined surface formed on the rear upper end portion of the right surface 85D of the first fixing portion 85 . The inclined surface inclines to the right as it goes upward and rearward.

(2-4) Sixth modified example

As shown in FIG. 15 , the first fixing portion 62 of the collar 42 may also have a rib 106 as an example of a thickness member at a rear upper end portion of its left surface 62C. The rib 106 protrudes leftward from the left surface 62C, and extends in a direction connecting the upper front and the lower rear.

According to this modified example, the rib 106 is interposed between the left surface 62C of the collar 42 and the right surface 85D as an example of the third surface of the first fixing portion 85 of the cover main body 43 . Thereby, a gap corresponding to the thickness of the rib 106 is generated between the left surface 62C of the collar 42 and the right surface 85D of the first fixing portion 85 of the cover main body 43 .

Therefore, the head portion 83 of the screw 82 presses the first fixing portion 85 not provided with the rib 106 more strongly than when pressing the rear upper end portion of the first fixing portion 85 provided with the rib 106 so as to narrow the gap. front lower end.

As a result, it is possible to press the cover main body 43 against the frame 31 more strongly at the lower front where the rib 106 is not interposed.

In addition, in the sixth modified example, as the thickness member, for example, an inclined surface formed at the rear upper end portion of the left surface 62C of the first fixing portion 62 of the collar 42 may be used. The inclined surface inclines to the left as it goes upward and rearward.

(3) The seventh modified example

In the above embodiment, the screw 82 is used as an example of the first fixing member, but the first fixing member is not particularly limited as long as it can press the first fixing portion 85 of the cover main body 43 . For example, as shown in FIG. 16 , the first fixing portion 85 may be pressed against the frame 31 by heating and melting the caulking portion 120 as an example of the first fixing member and deforming it into a flat plate shape.

As shown in FIG. 16A , the caulking portion 120 is made of thermoplastic resin. The caulking portion 120 extends leftward from the rear upper end portion of the left wall 33 of the frame 31 . The caulking portion 120 has a substantially cylindrical shape. In addition, the caulking portion 120 includes a rib 121 .

The rib 121 is arranged at the front lower end portion of the caulking portion 120 . The rib 121 protrudes forward and downward from the peripheral surface of the caulking portion 120 and extends in the left-right direction.

Then, as shown in FIG. 16B , when the caulking portion 120 is pressed from the left and heated and melted, the caulking portion 120 is deformed into a substantially disc shape. At this time, regarding the thickness of the deformed caulking portion 120 , the front lower end portion becomes thicker than the rear upper end portion by the thickness of the rib 121 .

Accordingly, the deformed caulking portion 120 presses the front lower end portion of the first fixing portion 85 more strongly than when pressing the rear upper end portion of the first fixing portion 85 .

As a result, the front lower end portion of the cover main body 43 can be pressed against the frame 31 more strongly.

(4) Eighth modified example

In the above-mentioned embodiment, the collar 42 and the cover main body 43 are constituted as independent members, but for example, the collar 42 and the cover main body 43 may be integrally formed, that is, constituted as a cover main body having the cylindrical portion 61. 43.

According to this modification, the cover main body 43 covers the left end portion of the developing roller 2 to restrict the leftward movement of the developing roller 2 .

Therefore, the leftward movement of the developing roller 2 can be restricted by the cover main body 43 .

As a result, the number of parts can be reduced, and the leftward movement of the developing roller 2 can be restricted.

(5) Other modifications

As the cartridge of the present invention, a toner box (toner cartridge) that does not have the developing roller 2 may also be configured.

In addition, in the above-mentioned embodiment, the agitator 6 was cited as an example of the transport member, but the transport member may be the supply roller 3 .

In addition, the material of the thickness member is not limited to the said embodiment and modification. Examples of the material of the thickness member include hard resin materials, soft resin materials such as sponge and rubber, metal materials such as stainless steel, and the like.

In addition, the thickness of the thickness member is appropriately set in consideration of the rigidity of the cover, the rigidity of the first fixing member and the second fixing member, and the like.

In addition, in the above-mentioned embodiments and modifications, the screw 82 and the caulking portion 120 were cited as the first fixing member, but the first fixing member is not particularly limited as long as the gear cover 38 can be pressed against the frame 31 . For example, the first fixing member may also be a so-called snap fit. In this case, for example, the first fixing member protrudes leftward from the upper rear end of the frame 31 and is bent forward and downward at the left end. Then, the first fixing member elastically presses the left surface 85C of the first fixing portion 85 of the cover main body 43 rightward.

Label description

1. Developing cartridge; 2. Developing roller; 2A, rotating shaft; 6. Stirrer; 31. Frame; 29. Screw joint; 29A. Left surface; 42. Collar; 43. Cover main body; 44. Developing unit Shaft device; 48, agitator gear; 49, detection gear; 77, detection gear limiting part; 81, pressing rib; 82, screw; 83, head; 83A, right surface; 85, first fixed part; 85C, left Surface; 85D, right surface; 90, actuator; A, central axis.

Claims (13)

1. a box, is characterized in that, possesses:

Framework, is configured to receive developer;

Transmission member, is positioned at described framework and extends along first direction, being configured to transmit described developer;

Transmission member, is positioned at outside described framework, is configured to the driving force supplied from outside to transmit to described transmission member;

Cover body, is configured to cover described transmission member, the fixed part that the mode having to be fixed on described framework is formed;

First fixed component, is configured to by pressing described fixed part and described cover body is fixed on described framework; And

Thickness component, has thickness in said first direction,

Described first fixed component has the press section for pressing described fixed part,

Described framework has the support portion for supporting described fixed part,

Described thickness component partial is between described press section and described support portion, and when being projected in said first direction described press section, described thickness component is overlapping with described press section.

2. box according to claim 1, is characterized in that,

Described press section has the first surface relative with the outside surface of the described first direction of described fixed part,

Described support portion has second relative with the inside surface of the described first direction of described fixed part,

Described thickness component is between the outside surface and described first surface of the described first direction of described fixed part and/or between the inside surface of the described first direction of described fixed part and described second.

3. box according to claim 2, is characterized in that,

Described thickness component is between the outside surface and described first surface of the described first direction of described fixed part.

4. the box according to any one of claims 1 to 3, is characterized in that,

This box also possesses developer roll, and this developer roll has the axis that extends along described first direction and is configured to bearing developer,

Described developer roll with the second direction of described axis vertical take-off on be supported on the first end of described framework,

Described first fixed component is configured to described cover body to be fixed on described first end.

5. box according to claim 4, is characterized in that,

Described cover body limits the movement of described developer roll in said first direction.

6. the box according to claim 4 or 5, is characterized in that,

Described developer roll possesses the axle extended along described first direction,

The covering part that described cover body has main part and formed in the mode of the side face covering described axle.

7. box according to claim 6, is characterized in that,

This box also possesses the second fixed component, this second fixed component across described covering part in the side contrary with described first fixed component.

8. the box according to any one of claim 4 ~ 7, is characterized in that,

This box also possesses detection means, and this detection means is configured to be detected by the testing agency of outside,

Described detection means is supported on the second end of the described framework being positioned at the position spaced apart with described first end in this second direction.

9. box according to claim 8, is characterized in that,

Described cover body has limiting unit, this restriction site in the outside of the described first direction of described detection means, for limiting the movement of described detection means to the outside of described first direction,

Described thickness component is positioned on the straight line of described first fixed component of link and described limiting unit.

10. box according to claim 8, is characterized in that,

Described cover body has limiting unit, this restriction site in the outside of the described first direction of described detection means, for limiting the movement of described detection means to the outside of described first direction,

Described thickness component is to be configured with two across the mode of the straight line linking described first fixed component and described limiting unit.

11. boxes according to claim 9 or 10, is characterized in that,

This box also possesses shaft coupling, and this shaft coupling is configured to accept the driving force from outside supply,

Described shaft coupling is between described first fixed component and described limiting unit.

12. boxes according to any one of claim 1 ~ 11, is characterized in that,

Described thickness component becomes to be integrated with described cover body.

13. boxes according to claim 1, is characterized in that,

This box also possesses developer roll, and this developer roll has the axis that extends along described first direction and is configured to bearing developer,

Described developer roll with the second direction of described axis vertical take-off on be supported on the first end of described framework,

Described developer roll possesses the axle extended along described first direction,

Described cover body has main part and with described main part split and the covering part that formed of the mode covering the side face of described axle,

Described main part has the 3rd relative with the outside surface of the described first direction of described covering part,

Described thickness component partial is between the outside surface of the described first direction of described covering part and described 3rd.