WO2016107214A1

WO2016107214A1 - Developing cartridge

Info

Publication number: WO2016107214A1
Application number: PCT/CN2015/089641
Authority: WO
Inventors: 李争光; 范文燚
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2014-12-30
Filing date: 2015-09-15
Publication date: 2016-07-07
Also published as: CN204347444U

Abstract

Disclosed is a developing cartridge, comprising: a cartridge body (1) having a carbon powder containing portion containing the carbon powder; a developing roller on which the carbon powder can be carried to develop electrostatic latent images; a gear (31) arranged outside one end wall of the cartridge body (1); and a rotation member (4) arranged outside the end wall. The rotation member (4) comprises a clutch gear having a small diameter portion (43) which can be clearance fitted with the gear top of the gear (31) and a large diameter portion (42) which can be interference fitted with the gear top of the gear (31). The large diameter portion (42) comprises an elastic friction layer (44) located on the periphery. One side of the clutch gear away from the cartridge body (1) is provided with a pushing block (41) protruding along the radial direction. A detecting member (5) can be pushed by the pushing block (41) and move in the longitudinal direction relative to the cartridge body (1). The gear (31) is coaxially provided with a cylinder portion (34). An opening slot (35) used for containing a protruding block (45) is arranged on the periphery of the cylinder portion (34). The protruding block (45) which has a staggered arrangement with the pushing block (41) circumferentially and can have an abutting connection with the cylinder portion (34) is arranged on the rotation member (4). A bias pressure member (47) applying bias pressure to the rotation member (4) makes the protruding block (45) in contact with the cylinder portion (34) under the bias pressure. At this point, the large diameter portion (42) is not in contact with the gear (31). The large diameter portion (42) is in contact with the gear (31) when the protruding block (45) is located in the opening slot (35).

Description

Developing cartridge

The present invention relates to the field of electrophotographic imaging, and more particularly to a developing cartridge for a laser printer. The present invention is based on a Chinese utility model patent application filed on Dec. 30, 2014, with the application number of 201420859164.5, the content of which is hereby incorporated by reference.

An electrophotographic image forming apparatus generally supplies toner using a developing cartridge detachably mounted therein, and develops an electrostatic latent image on the photosensitive member through a developing roller in the developing cartridge, and then transfers it onto a medium such as paper to form a visible image. In order to detect whether or not the developing cartridge mounted in the electrophotographic image forming apparatus is brand new, Chinese Patent Publication No. 100100470394C discloses a developing cartridge in which a developing roller is disposed at a powder discharge port of a casing to drive a rotating gear train such as a developing roller. On the outside of the casing, a detecting gear having a tooth missing portion is engageable with a driving gear in the gear train, and a detecting member is disposed on the detecting gear. When the new developing cartridge is mounted to the image forming apparatus, the gear train is driven to rotate by the image forming apparatus, and at the same time, the detecting gear is rotated, and the detecting member is moved to the detecting position by the rotation of the detecting gear, thereby causing the image forming apparatus to detect that the developing cartridge is brand new Developing cartridge. When the detecting gear is rotated to a position where the missing tooth portion faces the driving gear, the driving gear cannot be meshed to lose the driving force, so the rotation is stopped, and the detecting member has left the detecting position. When the used developing cartridge is mounted to the image forming apparatus again, the detecting gear will no longer rotate with the driving gear, the detecting member will no longer move, and the electrophotographic image forming apparatus detects that the developing cartridge is not a brand new developing cartridge.

When the developing cartridge is mounted to the imaging device, the gear is connected to the driving force of the imaging device and rotates. In the initial stage, the rotation of the entire gear train is not stable. At this time, the detecting gear is meshed with the driving gear and may rotate. The detecting gear or the detecting member is damaged, and the detecting gear having the detecting member has a complicated structure, high manufacturing and mounting precision requirements, and high cost, and the developing cartridge having the detecting gear is also high in cost.

Therefore, there is a need for a developing cartridge which is simple in structure, low in cost, and which can be moved after the gear train rotates smoothly.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a developing cartridge which is simple in structure, low in cost, and which can be moved after the gear train rotates smoothly.

In order to achieve the above main object, a developing cartridge provided by the present invention includes: a casing having a toner accommodating portion for containing toner; a developing roller on which carbon powder can be carried to develop an electrostatic latent image; and is disposed outside one end wall of the casing a gear member disposed on an outer side of the end wall, the transmission member including a small diameter portion having a clearance fit with the tooth tip of the gear and a large-diameter portion of the large-diameter portion that can be interference-fitted with the tooth tip of the gear, the large diameter portion including An elastic friction layer on the circumferential surface, a side of the clutch wheel away from the casing is provided with a push block protruding radially; a detecting piece which can be pushed by the push block to move longitudinally relative to the casing; the gear is provided with a coaxial cylinder a circular groove on the circumferential surface of the cylindrical portion for accommodating the projection, and the rotating member is provided with a bump which is arranged in a wrong phase with the push block in the circumferential direction and which can abut against the cylindrical portion; The biasing member to the rotating member contacts the convex portion and the cylindrical portion under a biasing force. At this time, the large diameter portion is not in contact with the gear, and the large diameter portion is in contact with the gear when the protruding block is located in the open groove.

More specifically, the biasing member is a torsion spring that fits over the rotating shaft of the rotating member. It can be seen from the above that the torsion spring can apply pressure to the bump to make it contact with the cylindrical portion under pressure, so that during the transportation of the developing cartridge, the rotating member will remain in its initial position without deviation, and the detecting member is improved. Detection stability. When the gear is rotated to the opening groove of the cylindrical portion and the convex block, the rotating member rotates under the biasing force of the torsion spring, so that the large diameter portion of the rotating member contacts the gear, and then the rotating member rotates by the gear, thereby realizing Smooth rotation of the rotating member.

More specifically, the end cap is disposed on the casing, and the rotating member and the gear are located between the end wall and the end cap. As can be seen from the above, the end cap can function to protect the rotating member and the gear.

Further more specifically, the detecting member is disposed on the end cover, and the end cover is provided with a limiting slot for restricting movement of the detecting member, and when the rotating member rotates, the protruding block pushes the detecting member to move along the limiting slot. It can be seen from the above that the detecting member is disposed on the end cover instead of the rotating member, so that the structure of the rotating member is simpler, so that the cost of the entire developing box is reduced, and the limiting groove is arranged on the end cover to move the detecting member along the limiting slot, so that The movement of the detecting piece is smoother.

Preferably, the casing is provided with a second biasing member for holding the detecting member in the initial position. After the detection is completed, the detecting member can be returned to its original position by the second biasing member, thereby making the developing cartridge structure more compact.

Preferably, the outer circumference of the clutch wheel is provided with a rubber ring, and the elastic friction layer is a part of the outer circumference of the large diameter rubber ring. The use of a rubber ring makes the setting of the elastic friction layer simpler and more convenient.

The present invention has an advantage that the developing cartridge to which the rotating member is mounted has a simple structure and a low cost.

Figure 1 is a structural view of an embodiment of the present invention;

2 is a structural view of an end cover and a detecting member in an embodiment of the present invention;

3 is a structural diagram of a driving end in an embodiment of the present invention;

Figure 4 is a view showing the positional relationship between the rotating member and the detecting member in the embodiment of the present invention;

Figure 5 is a structural view of a gear and a rotating member in an embodiment of the present invention;

Figure 6 is a structural view showing another perspective of the gear in the embodiment of the present invention;

Figure 7 is a structural view showing another perspective of the rotating member in the embodiment of the present invention;

Figure 8 is a structural view of a first biasing member in an embodiment of the present invention;

Figure 9 is a structural view showing another perspective view of the end cap in the embodiment of the present invention;

Figure 10 is a structural view showing another perspective of the detecting member in the embodiment of the present invention;

Figure 11 is a structural view of a second biasing member in the embodiment of the present invention.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in FIG. 1, the casing 1 of the present embodiment has a toner accommodating portion for accommodating carbon powder, and the driving end of the casing 1 is provided with an end cover 11 having a toner accommodating portion The powder supply port is provided externally, the developing roller is rotatably disposed at the powder discharge port, and the developing cartridge is detachably mounted in the electrophotographic image forming apparatus, and the toner of the toner accommodating portion passes through the developing roller to electrostatically the photosensitive member The latent image is developed. Similar to the internal structure of the developing cartridge in the prior art, the casing 1 is usually provided with a stirring frame, a powder feeding roller, a powder discharging knife and the like, and a gear train for driving the developing roller or the like is disposed at the driving end of the developing cartridge, and the developing cartridge When mounted in the image forming apparatus, the driving force is received by the driving head 2 from the image forming apparatus to drive the gear train and the developing roller, the powder feeding roller, the stirring frame, and the like.

Fig. 2 shows the end cap 11 and the detecting member 5 thereon, at which time the detecting member 5 is in the initial position. The end cover 11 is provided with an inclined chute 12, and the detecting member 5 is movable along the chute 12 so as to be protruded or retracted in the longitudinal direction of the developing cartridge. The chute 12 is a limit groove that restricts the movement of the detecting member 5.

3 shows the structure of the driving end of the developing cartridge. The gear train 3 is disposed between the end wall of the casing 1 and the end cover 11, and the driving head 2 is disposed at the end of a gear in the gear train 3, and is rotatably fixed to the end wall. The outer rotating member 4 is disposed adjacent to the gear 31 in the gear train 3, and the rotating shaft of each gear in the gear train 3 is parallel to the rotating shaft of the rotating member 4, and the axial direction coincides with the longitudinal direction of the developing cartridge. In the present embodiment, the gear 31 is a drive gear that drives the agitating member, it being understood that the rotating member 4 may be disposed adjacent to any of the gear trains 3.

4 shows the positional relationship between the rotating member 4 and the detecting member 5 when the detecting member 5 is in the initial position. When the rotating member 4 is rotated in the direction of the arrow shown in the figure, the push block 41 on the rotating member 4 and the detecting member 5 are The push end 52 is in contact, and as the rotary member 4 is further rotated, the push block 41 will push the detecting member 5 to move along the chute 12.

Fig. 5 shows the positional relationship of the gear 31 and the rotating member 4 when the developing cartridge is a brand new cartridge. Referring to Figures 5, 6, and 7, the gear 31 includes a gear portion 32 that transmits a driving force to the rotating member 4, a gear portion 33 that receives a driving force from a gear in the gear train 3, and a cylindrical portion 34 therebetween. The cylindrical portion 34 is provided with an opening groove 35; the rotating member 4 includes a clutch wheel having a large diameter portion 42 and a small diameter portion 43, the outer circumference of the clutch wheel is a rubber ring 44, and the push block 41 is disposed at the clutch wheel near the end cover On one side of the 11 , the bump 45 is disposed on the side close to the casing 1 , and the push block 41 and the bump 45 are offset from the rotation axis of the rotating member 4 and are arranged in a wrong phase, that is, the push block 41 and the bump 45 are perpendicular to the axial direction. The direction is not in the same position. The barrel 46 is disposed at the center of the rotating member 4 and extends in the axial direction. The torsion spring 47 as the first biasing member embodiment is sleeved on the outer side of the barrel 46 near the casing portion. In the state shown in FIG. 45 abuts against the cylindrical portion 34 under the biasing force of the torsion spring 47.

As shown in Fig. 8, the torsion spring 47 has two end portions 48, 49, wherein the end portion 48 is fixed to the rotating member and the end portion 49 is fixed to the casing.

Referring to FIG. 9, FIG. 10 and FIG. 11, the end cover 11 is provided with a sliding groove 12 which is inclined along the longitudinal direction of the casing, and a mounting guide 13 which is sleeved outside the shaft cylinder 46 of the rotating member 4 for fixing as a second bias. The fixing post 14 of the torsion spring 6 of the embodiment and the fixing member 15 of the one end portion 61 of the fixed torsion spring 6, the detecting member 5 is disposed on the chute 12, and has a detecting end 51 detected by the image forming apparatus when moving to the detecting position. The pushed end 52 that can be pushed by the push block 41 of the rotating member 4, the card slot 53 that is engaged with the two side walls of the chute 12, and the bayonet 54 of the other end portion 62 of the fixed torsion spring 6. The torsion spring 6 applies a biasing force for holding the detecting member 5 at the initial position, and in the initial position, the detecting member 5 is located at one end of the chute 12 close to the casing 1.

When the new developing cartridge of the present embodiment is mounted to the image forming apparatus, the driving head 2 receives the driving force to rotate, and the entire gear train 3 is rotated, so that the gear 31 rotates, and the projection 45 of the rotating member 4 and the cylindrical portion 34 of the gear 31 are rotated. Abutting, the rotating member 4 cannot be rotated by the biasing force of the torsion spring 47 until the gear 31 rotates until the opening groove 35 of the cylindrical portion 34 faces, at which time the operation of the gear train 3 is relatively stable, and the bump 45 is not Then, the cylindrical portion 34 abuts and enters the opening groove 35, and the rotating member 4 rotates under the biasing force of the torsion spring 47, so that the large diameter portion 42 of the clutch wheel faces the gear 31, and the tooth top of the gear 31 With the interference fit, the rotating member 4 is further rotated by the friction gear 31, and the push block 41 pushes the pushed end 52 of the detecting member 5, so that the detecting member 5 moves along the sliding groove 12 away from the casing 1 against the biasing force of the torsion spring 6. To the detecting position, at which the detecting end 51 is detected by the image forming apparatus, thereby determining that the developing cartridge is brand new, and when the rotating member 4 is further rotated, the pushing block 41 is disengaged from the pushed end 52 of the detecting member 5, and the detecting member is twisted The spring 6 moves along the chute 12 to the initial position under the biasing force. When the rotating member 4 is turned to face the small-diameter portion 43 and the gear 31, the rotating member 4 is engaged with the tip of the gear 31, that is, the rotating member 4 is no longer in contact with the gear 31, and the rotating member 4 stops rotating.

When the used developing cartridge is again mounted to the electrophotographic image forming apparatus, the rotating member 4 is no longer rotated by contact with the gear 31, and the detecting member 5 is also held at its initial position, so that the developing cartridge is detected to be not brand new.

The torsion spring 47 as a biasing member applies a biasing force to the rotating member 4. After the rotating member 4 is rotated by the biasing force and further driven by the gear 31, the torsion spring 47 will no longer apply a biasing force to the rotating member 4. It can be understood that the biasing member is not limited to the form of a torsion spring. For example, a spring piece or the like may be disposed on the casing, and the projection 45 of the rotating member 4 may be forced to abut against the cylindrical portion 34 of the gear 31. After the piece 4 is rotated, the elastic piece can be separated from the rotating piece. The torsion spring that applies the biasing force to the detecting member 5 can also be replaced with other mechanisms capable of applying a biasing force. The rubber ring 44 which provides the elastic friction layer for the large diameter portion of the rotating member may be replaced by other structures or adhered only to the large diameter portion. The detecting member can also be directly disposed on the rotating member.

It can be seen from the above scheme that the clutch wheel of the rotating member cooperates with the gear to move the detecting member to realize the detecting of the detecting member by the image forming apparatus, and the rotating member structure having the large diameter portion and the small diameter portion is compared with the detecting wheel with the missing tooth portion. Simple and low precision requirements. The bump is in contact with the cylindrical portion of the gear so that when the gear starts to rotate, the large diameter portion does not contact the gear. Since the bump abuts against the cylindrical portion, the rotating member cannot rotate, only when the cylindrical portion rotates to the open slot thereof When facing the bump, the rotating member can be rotated under the biasing force of the biasing member, and the large diameter portion is in contact with the gear, and then the rotating member is rotated by the gear to push the detecting member to move and the imaging device detects it. Therefore, after the gear that drives the rotating member rotates for a while, the gear train of the developing cartridge rotates smoothly, and the detecting member moves, so that the detecting member is not easily damaged.

Claims

Developing cartridge, including

a cartridge having a toner receiving portion for containing toner;

a developing roller on which carbon powder can be carried to develop an electrostatic latent image;

a gear disposed outside the one end wall of the casing;

It is characterized by:

a rotating member disposed outside the end wall, comprising a clutch wheel having a small diameter portion engageable with a tooth tip clearance of the gear and a large diameter portion engageable with the tooth tip of the gear, the large diameter The portion includes an elastic friction layer on a circumferential surface, and a side of the clutch wheel away from the casing is provided with a push block protruding radially;

a detecting member that pushes a longitudinal movement of the detecting member relative to the casing;

The gear is provided with a coaxial cylindrical portion, and the rotating member is provided with a bump which is arranged in a wrong phase with the push block in the circumferential direction and which can abut against the cylindrical portion, the cylindrical portion The circumferential surface has an open slot for receiving the bump;

a biasing member, the biasing member applies a biasing force to the rotating member, so that the bump and the cylindrical portion are in contact under a biasing force, and the large diameter portion is not in contact with the gear. When the bump is located in the open slot, the large diameter portion is in contact with the gear.
The developing cartridge according to claim 1, wherein:

The biasing member is a torsion spring that is sleeved outside the rotating shaft of the rotating member.
The developing cartridge according to claim 2, wherein:

An end cover is disposed on the casing, and the rotating member and the gear are located between the end wall and the end cover.
The developing cartridge according to claim 3, wherein:

The detecting member is disposed on the end cover, and the end cover is provided with a limiting slot for restricting movement of the detecting member, and when the rotating member rotates, the protruding block pushes the detecting member along the The limit slot moves.
The developing cartridge according to any one of claims 1 to 4, wherein:

The casing is provided with a second biasing member that holds the detecting member in an initial position.
The developing cartridge according to any one of claims 1 to 4, wherein:

A rubber ring is sleeved on an outer circumference of the clutch wheel, and the elastic friction layer is a part of the outer circumference of the large diameter of the rubber ring.