WO2012113299A1

WO2012113299A1 - Rotation driving force receiver head and drive assembly

Info

Publication number: WO2012113299A1
Application number: PCT/CN2012/071145
Authority: WO
Inventors: 汤付根; 周宏辉
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2011-02-21
Filing date: 2012-02-15
Publication date: 2012-08-30
Also published as: CN102096352A; CN102096352B

Abstract

A rotation driving force receiver head(3) and a drive assembly (1). The receiver head (3) has a concave spherical surface (35), approaching surfaces (33, 34) on the periphery of the spherical surface (35), and a first convex pawl (31) and a second convex pawl (32) extending outwards. The surface of each convex pawl has an engaging surface (313, 323) for fitting a drive member of an imaging device and two side surfaces (311, 312, 321, 322) of smooth transition and for guiding. The two side surfaces are abutted through a transition edge (304) inclined relative to the direction of the axis (39). The transition edge (304) has a first endpoint (305) and a second endpoint (306). The second endpoint (306) is on a second surface (301). A first bottom edge (302) and a second bottom edge (302) intersect at the second endpoint (306). The second endpoint (306) is a point, on the convex pawl (31), farthest from the axis (39). The first endpoint (305) is closer to the axis (39) than the second endpoint (306).

Description

Rotary driving force receiving head and drive assembly

Technical field

The present invention relates to a rotary driving force receiving head and a driving assembly having such a rotational driving force receiving head. The present application claims priority to Chinese Patent Application No. 201110041855.5, entitled "Rotary Driving Force Receiving Head and Drive Assembly", which is incorporated herein by reference. .

Background technique

Electrophotographic image forming apparatuses include copying machines, laser printers, and the like. There is usually a process cartridge inside the electrophotographic image forming apparatus, and the process cartridge can be mounted to and detached from the main assembly of the electrophotographic image forming apparatus. For example, a process cartridge prepared by integrally assembling at least one of a developing device, a charging device, and a cleaning device as a processing device into a casing.

The existing process cartridge includes the following types: a first process cartridge prepared by assembling a photosensitive drum and a unit composed of a developing device, a charging device, and a cleaning device in a cartridge; by integrally assembling the photosensitive drum and the charging device in the cartridge And a second process cartridge prepared; and a third process cartridge prepared by integrally assembling the photosensitive drum and two processing units composed of a charging device and a cleaning device.

The user himself can detachably mount the above process cartridge to the main assembly of the electrophotographic image forming apparatus. Therefore, the user can perform maintenance of the equipment without relying on professional service personnel, thereby improving the operability of the user for the maintenance of the electrophotographic image forming apparatus.

In the above-described conventional process cartridge, for receiving a rotational driving force from the apparatus main assembly to drive the photosensitive drum driving mechanism as follows: on the main assembly side, a rotatable member and a non-circular torsion hole are provided, and the rotatable member is used for transmission The driving force of the motor, the torsion hole is provided at the center of the rotatable member, and is provided with a plurality of corner portions and has a cross section which can be rotated integrally with the rotatable member. On the side of the process cartridge, a non-circular torsion projection is provided which is provided at one of the axial ends of the photosensitive drum and has a cross section provided with a plurality of corners. When the process cartridge is attached to the apparatus main assembly, when the rotatable member is rotated in a state where the projection and the hole are engaged with each other, the rotational driving force of the rotatable member is transmitted to the photosensitive drum. As a result, the rotational force for driving the photosensitive drum is transmitted from the apparatus main assembly to the photosensitive drum. Another known mechanism is a process cartridge constructed by driving a photosensitive drum by engaging a gear fixed to the photosensitive drum, thereby driving the photosensitive drum. However, in the US patent US5903803 In the conventional configuration described in the above, when the process cartridge is attached to or detached from the main assembly by moving the process cartridge in a direction substantially perpendicular to the axis of the rotatable member, it is necessary to move the rotatable member in the horizontal direction. . That is, the rotatable member needs to be horizontally moved by the opening and closing operations of the main assembly cover. The hole is separated from the protrusion by the opening operation of the main assembly cover. On the other hand, by the closing operation of the main assembly cover, the hole is moved toward the projection to engage with the projection. Therefore, in the conventional process cartridge, it is necessary to provide a mechanism on the main assembly for moving the rotatable member in the direction of the rotation axis by the opening and closing operations of the main assembly cover. In the US patent US4829335 In the described construction, it is not necessary to move the drive gear provided to the main assembly along its axial direction, and the cartridge can be mounted to and detached from the main assembly by moving in a direction substantially perpendicular to the axis. . However, in this configuration, the drive coupling portion between the main assembly and the process cartridge is the meshing portion between the gears, so that it is difficult to prevent the rotation unevenness of the photosensitive drum.

Another process cartridge is disclosed in the US Patent Application Publication No. US 2008/0152388 A1, which is a modification of the above-described process cartridge in that the drive assembly at one axial end of the photosensitive drum is a ball joint driven joint structure. This drive coupling structure is easy to escape from the drive assembly, especially during transportation, which is more likely to occur, resulting in loss of function or instability of the drive assembly.

The Chinese utility model patent CN200920238326.2 provides a photosensitive drum driving assembly comprising a gear and an axial adjustment assembly closely fitted to one end of the photosensitive drum, the axial adjustment assembly comprising a first moving subassembly, a groove member and a central shaft member The groove member has upper and lower sliding grooves that are spatially perpendicular to each other, and the first moving subassembly forms a relative sliding fit with the upper sliding groove in a first direction; the central shaft member and the seat The gears have a common axis that forms a relatively sliding fit with the glide groove in a second direction; both the first direction and the second direction are perpendicular to the drum axis. The first motion subassembly includes a rotary driving force receiving head extending outside the gear and an adjusting slider, and the rotating driving force receiving head is rotatably coupled to the adjusting slider about an axis thereof, the rotation A rotation limit pin rotatable about the axis is disposed between the driving force receiving head and the adjustment slider. When the process cartridge is dropped or taken out, a problem of jamming between the rotary driving force receiving head and the image forming apparatus driving member in the above-described photosensitive drum drive unit is apt to occur. Therefore, there is still room for further improvement of the above-described photosensitive drum drive unit.

technical problem

SUMMARY OF THE INVENTION A first object of the present invention is to provide a rotary driving force receiving head capable of minimizing a dead spot position area when a machine is dropped and a process cartridge is taken out, and a jamming problem between the rotary driving force receiving head and the image forming apparatus driving member is avoided. .

A second object of the present invention is to provide a drive assembly having the above-described rotational driving force receiving head.

Technical solution

In order to achieve the above first object, the present invention adopts the following technical solution: providing a rotary driving force receiving head, a first surface facing outward, a second surface facing inward, and first and second outwardly projecting claws, the first and second claws being about an axis of the rotational driving force receiving head Forming a center symmetry; the first surface includes a concave spherical surface and a cut surface around the spherical surface, the first and second claws separating the cut surface into a first cut surface and a first a second cut-in surface; wherein each of the surfaces of the claws has a occlusal surface for mating with the imaging device driving component and two sides for smooth transition of guiding, wherein the first side passes through the first bottom edge Adjacent to the second surface, the second side is adjacent to the second surface by a second bottom edge, the two sides being abutted by a crossing edge inclined with respect to the direction of the axis; the intersection edge has a first end point and a second end point, the second end point being located on the second surface, the first bottom edge and the second bottom edge intersecting at the second end point; the second end point being the convex end a point on the pawl that is furthest from the axis, the first end point A second end closer to said axis.

Preferably, the second end of the intersection edge is located in the upstream direction of the first end point in the rotational direction of the rotational driving force receiving head.

Preferably, the angle formed by the intersection edge and the axis is 20°~60°

Preferably, the first and second fingers project outwardly in a direction substantially in the direction of the axis.

In order to achieve the above second object, the present invention adopts the following technical solution: a drive assembly is provided, comprising: a gear having a fixed end; and an axial adjustment assembly having a rotational driving force extending beyond the other end of the gear a receiving head; the axial adjustment component is axially reciprocally disposed in the gear along the gear, and the elastic adjusting component and the axial limiting component are disposed between the axial adjustment component and the gear; The rotary driving force receiving head has an outwardly facing first surface, an inwardly facing second surface, and outwardly projecting first and second claws, the first and second claws being The axis of the rotational driving force receiving head forms a central symmetry; the first surface includes a concave spherical surface and a cutting plane located around the spherical surface, the first and second claws separating the cut surface into a first entry face and a second cut-in face; wherein each of the surfaces of the claws has a occlusal surface for mating with the imaging device drive member and two sides for smooth transition of the guide, wherein the first Side pass The first bottom edge is adjacent to the second surface, and the second side surface is adjacent to the second surface by a second bottom edge, and the two side surfaces are adjacent by a crossing edge inclined with respect to the direction of the axis; The intersection edge has a first end point and a second end point, the second end point is located on the second surface, the first bottom side and the second bottom side intersect at the second end point; The two end points are the points on the tab that are furthest from the axis, the first end point being closer to the axis than the second end point.

Preferably, the axial adjustment assembly includes an adjustment slider, a groove member and a central shaft member, the rotary driving force receiving head being rotatably coupled to the adjustment slider about an axis thereof, the groove member having a space An upper sliding groove and a sliding groove perpendicular to each other, the adjusting slider forms a relative sliding fit with the upper sliding groove in a first direction; the central shaft member and the gear have a common axis, and the A sliding fit is formed in the two directions with the sliding groove; the first direction and the second direction are both perpendicular to the axial direction of the photosensitive drum.

Preferably, the elastic supporting member is a spring sleeved on the central shaft member, the central shaft member is composed of a head portion, a step portion and a rod portion, and the head portion is engaged with the sliding groove, the step A portion is located between the groove member and the spring.

Beneficial effect

With the process cartridge employing the rotary driving force receiving head of the present invention, in the process of mounting to the image forming apparatus, the rotary driving force receiving head of the present invention is rotated to a proper position under the contact pressure of the driving member of the image forming apparatus, whereby the image forming apparatus drives The component retracts the rotary driving force receiving head in the longitudinal direction, ensuring that the driving function is normally performed. The invention can minimize the dead zone position when the machine is dropped and the process cartridge is taken out, and the problem of jamming between the rotary driving force receiving head and the image forming device driving component is avoided, so that the photosensitive drum can be driven safely and reliably. The driving component of the invention is simple and convenient to assemble, and has stable structural performance. The processing box constructed by using the driving component is stable, stable in performance and stable in operation.

DRAWINGS

The present invention is further described below in conjunction with the accompanying drawings:

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the structure of a photosensitive drum to which a driving assembly of an embodiment of the present invention is applied.

2 is a schematic structural view of the drive assembly of FIG. 1.

Figure 3 is an exploded perspective view of the drive assembly of Figure 2.

4 is a schematic view showing the internal structure of a gear of the drive assembly shown in FIG. 2.

Fig. 5 is a schematic view showing the structure of a rotary driving force receiving head among the driving assemblies shown in Fig. 2.

Fig. 6 is a view showing another angle of the rotational driving force receiving head shown in Fig. 5.

Figure 7 is a schematic view showing the cooperation of the driving assembly of Figure 2 with the driving member of the image forming apparatus during the process of dropping the process cartridge.

Fig. 8 is a partial enlarged view of Fig. 7;

Embodiments of the invention

1 shows a photosensitive drum 10 to which a drive unit 1 of an embodiment of the present invention is applied. The drive unit 1 is fixed to one end of a drum main body 20 of a photosensitive drum 10, and a photosensitive layer is provided on a circumferential surface of the drum main body 20. The drive unit 1 is for receiving a rotational driving force from the image forming apparatus drive mechanism, and transmits the rotational driving force to the drum main body 20 to rotate the drum main body 20 about its axis under the rotational driving force.

2 to 4 show the basic configuration of the drive unit 1, and the structure mainly includes a gear 2, a rotary driving force receiving head 3, an adjustment slider 4, a groove member 5, a rotation limit pin 6, a center shaft member 9, and a limit. The plug 7 and the helical compression spring 8 are provided. The gear 2 is tightly fitted to one end of the drum main body 20 through its fixed end 21, the axis of which coincides with the axis of the drum main body 20 and rotates about their common axis in synchronism with the drum main body 20. The rotary driving force receiving head 3 is coupled to the adjustment slider 4 by a rotation limit pin 6 which is reciprocally rotatable relative to the adjustment slider 4 about its axis within a certain angular range; the spring 8 is sleeved on the central axis On the component 9, the central shaft component 9 is fitted in the gear 2 via a limit pin 7.

As shown in FIG. 4, the rotational driving force receiving head 3, the adjustment slider 4, the rotation limit pin 6, the groove member 5, and the center shaft member 9 constitute an axial adjustment assembly 11. By the compression of the spring 8 and the axial limit of the limit pin 7, the axial adjustment assembly 11 can perform a limited axial reciprocating translation movement relative to the gear 2 along the axial direction Z of the photosensitive drum. Further, the first moving sub-assembly consisting of the rotational driving force receiving head 3, the adjusting slider 4 and the rotation limiting pin 6 may be in the first direction A perpendicular to the axial direction Z of the photosensitive drum, relative to the upper sliding groove 51 The groove member 5 is subjected to a limited first linear reciprocating translational movement; and the second moving subassembly consisting of the first moving subassembly plus the groove member 5 may be in a second direction B perpendicular to the axial direction Z of the photosensitive drum The second linear reciprocating translation movement is restricted with respect to the central shaft member 9, and the first direction A and the second direction B are perpendicular to each other.

The structure of the drive assembly 1 of the above structure, except for the rotary driving force receiving head 3 and the central shaft member 9, is basically the same as the structure of the drive assembly in the utility model CN200920238326.2, and the working principle is also basically similar, for example, the gear 2 The specific structure of the adjusting slider 4, the groove member 5, the rotation limit pin 6, the limit pin 7 and the spiral compression spring 8 can be referred to the above patent. The following mainly explains the differences.

5 and 6, the rotational driving force receiving head 3 is substantially in the shape of a torch, and is an outer end portion 30, an intermediate portion 36, and a shaft portion which are tapered from the outside to the inside (from top to bottom in Fig. 5). 37, the intermediate portion 36 and the shaft portion 37 are both cylindrical, and the shaft portion 37 is provided with a pin hole 38 through which the rotation limiting pin 6 passes.

The outer end portion 30 has an outwardly facing first surface and an inwardly facing second surface 301 and first and

second claws

31 and 32 projecting outwardly in the direction of the axis 39 of the rotational driving force receiving head 3, The first cam 31 and the second lug 32 form a central symmetry about the axis 39. A central surface of the first surface is formed with a concave spherical surface 35. The spherical surface 35 is distributed around the spherical surface 35 with a cutting surface. The cutting surface is divided by the first claw 31 and the second claw 32 into a first cutting surface. 33 and a second cut-in surface 34. The surface of the first claw 31 has a first occlusal surface 313, a first side surface 311 and a second side surface 312, and the surface of the second claw 32 has a second occlusal surface 323, a third side surface 321 and a fourth side surface 322. The first occlusal surface 313 and the second occlusal surface 323 are used to cooperate with the imaging device driving component, and the first side surface 311, the second side surface 312, the third side surface 321 and the fourth side surface 322 are smooth transitional slopes, which are advantageous for the imaging device. The drive member is wiped over one of the sides and cut into the spherical surface 35. Since the first claw 31 is symmetrical with the second claw 32, the structural features of the first claw 31 will be described below as an example. In the first claw 31, the first side surface 311 is adjacent to the second surface 301 by the first bottom edge 302, and the second side surface 312 is adjacent to the second surface 301 by the second bottom edge 303, the first side surface 311 and the first surface 311 The two side faces 312 are adjacent by abutting edges 304 which are inclined with respect to the direction of the axis 39. The angle of the intersection edge 304 and the direction of the axis 39 is preferably 20° to 60°. In the range, the larger the angle, the greater the inclination of the first side surface 311 and the second side surface 312, and the image forming apparatus driving member is more easily wiped over one of the side surfaces and cut into the cut-in surface. The intersection edge 304 has a first end point 305 and a second end point 306, the second end point 306 being located on the second surface 301, the first bottom edge 302 and the second bottom edge 303 intersecting at the second end point 306; The second end point 306 is the point on the first cam 31 that is furthest from the axis 39, and the first end point 305 is closer to the axis 39 than the second end point 306. The second end point 306 of the intersection edge 304 is located in the upstream direction of the first end point 305 in the rotational direction (the direction indicated by the arrow in FIG. 6) when the rotational driving force receiving head 3 is in operation. In the rotational driving force receiving head 3 of the above configuration, since the outermost point of the contour on the first claw 31 (i.e., the second end point 306) is located at a lower position, this facilitates the imaging device driving part to skip the handover edge. 304 is in contact with the first side 311 or the second side 312 without being stuck by the obstruction and interference of the intersection edge 304, so that the process cartridge is in the process of dropping or unloading with the driving device of the image forming apparatus. The cooperation is smoother.

Referring to FIGS. 3 and 4, the center shaft member 9 is composed of a head portion 91, a step portion 94, and a rod portion 92, and the step portion 94 is located below the head portion 91. The head 91 has a waist-shaped thin plate shape, and the cross-sectional shape of the rod portion 92 is also waist-shaped, but the cross-sectional area of the rod portion 92 is smaller than the area of the head portion 91. The bottom of the rod portion 92 is provided with a pin hole 93 penetrating the rod portion 92 in the radial direction, and the pin hole 93 is engaged with the limit pin 7. The head 91 cooperates with a sliding groove 52 of the groove member 5, and the step portion 94 is located between the groove member 5 and the spring 8. Since the step portion 94 is provided, the spring 8 does not need to directly contact the groove member 5, so that the rotation of the groove member 5 is made more flexible.

Referring to Figure 7, the operation of the drive assembly 1 of the above structure is as follows:

1. In the process of pushing the process cartridge into the image forming apparatus, the driving component 1 is in contact with the image forming apparatus driving component 13 in the X direction, and there are two cases at this time;

a. If the initial contact position is a claw, the image forming device driving member 13 will touch the two sides of the claw, and the two faces must have a weaker force on the face, and when the first side 311 is weakly stressed, The image forming apparatus driving member 13 rubs the second side surface 312 to push the rotational driving force receiving head 3 by an angle about its axis, and the image forming apparatus driving member 13 automatically cuts into the two cutting faces of the rotary driving force receiving head 3, and Causing the entire adjustment member in the drive assembly 1 to move in the Y direction;

b. If the initial contact position is the two cut-in faces of the rotary driving force receiving head 3, the image forming apparatus driving member 13 directly cuts into the cutting plane directly, and causes the respective adjusting members in the driving assembly 1 to move in the Y direction as a whole;

2. As the intensity in the X direction increases, the displacement of the entire adjustment member in the drive unit 1 in the Y direction also increases; and only when the imaging device drive unit 13 touches the spherical surface 35, each adjustment in the drive unit 1 The component moves in the opposite direction of the Y direction until the displacement is zero;

3. When the imaging device is started, the imaging device driving component 13 automatically couples the driving component 1, and the driving component 1 receives the driving force from the imaging device to drive the photosensitive drum to rotate;

4. When the driving component 1 receives the driving force of the imaging device, the driving force from the imaging device may not be a constant value, and thus the driving force of the imaging device is buffered by the linear movement of the adjusting components in the driving component 1 in a small range. The value, so that the photosensitive drum rotates smoothly, does not produce jitter and fluctuation, the processing box works normally, and the printing quality is excellent;

5, the imaging device stops, if the processing cartridge is removed from the imaging device, the processing cartridge moves in the opposite direction of the X direction initially, the imaging device driving component 13 begins to detach from the driving component 1;

6. When the imaging device driving component 13 touches the spherical surface 35, each of the adjustment components in the driving component 1 moves in the Y direction as a whole;

7. As the displacement amount of the entire adjustment member in the drive unit 1 increases in the Y direction, if the imaging device drive unit 13 encounters the two claws of the rotary driving force receiving head 3, the rotational driving force is received. The head 3 is rotated an angle about its axis, causing the image forming apparatus driving member 13 to cut into the cut surface of the rotary driving force receiving head 3;

8. When the driving device of the image forming apparatus is cut into the cutting plane, the respective adjusting members in the gear driving head start to move in the opposite direction of the Y direction as a whole, until the displacement amount is zero, the process cartridge can be taken out from the image forming apparatus.

The above is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various modifications and improvements without departing from the scope of the present invention without departing from the scope of the present invention. protected range. For example, the limit pin can be implemented using other axial limit structures that are readily apparent to those skilled in the art. The axial stop structure can be a separate member from the central shaft member or a member formed on the central shaft member. section. Further, the elastic supporting member may be replaced with an elastic member other than a spiral compression spring, such as an elastic plastic member structure that can be compressed.

Industrial applicability

The rotary driving force receiving head and the driving assembly of the present invention can be manufactured and used industrially, and when applied to the process cartridge, the dead spot position area when the machine is dropped and the process cartridge is taken out can be minimized, and the rotary driving force receiving head can be avoided. A problem of jamming with the driving head of the image forming apparatus enables safe and reliable driving of the photosensitive drum. The driving component of the invention is simple and convenient to assemble, and has stable structural performance. The processing box constructed by using the driving component is stable, reliable in performance and stable in operation. Therefore, the present invention has industrial applicability.

Claims

Rotary drive force receiving head, a first surface facing outward, a second surface facing inward, and first and second outwardly projecting claws, the first and second claws being about an axis of the rotational driving force receiving head Forming a center symmetry; the first surface includes a concave spherical surface and a cut surface around the spherical surface, the first and second claws separating the cut surface into a first cut surface and a first Two cut-in faces; characterized by:

The surface of each of the claws has a occlusal surface for mating with the imaging device driving member and two sides for smooth transition of guiding, wherein the first side is adjacent to the second surface by the first bottom edge a second side is adjacent to the second surface by a second bottom edge, and the two sides are adjacent by abutting edge which is inclined with respect to the direction of the axis;

The intersection edge has a first end point and a second end point, the second end point is located on the second surface, and the first bottom edge and the second bottom edge intersect at the second end point;

The second end point is a point on the tab that is furthest from the axis, the first end point being closer to the axis than the second end point.
The rotary driving force receiving head according to claim 1, wherein a second end of said overlapping edge is located in an upstream direction of the first end point in a rotational direction when said rotational driving force receiving head operates.
The rotary driving force receiving head according to claim 1, wherein an angle formed by the intersecting edge and the direction of the axis is 20 to 60.
A rotary driving force receiving head according to claim 1, wherein said first and second claws project outward substantially in a direction of said axis.
Drive components, including:

a gear having a fixed end;

An axial adjustment assembly having a rotational driving force receiving head extending beyond the other end of the gear;

The axial adjustment assembly is axially reciprocally disposed in the gear along the gear, and an elastic support member and an axial limiting member are disposed between the axial adjustment assembly and the gear;

The rotary driving force receiving head has an outwardly facing first surface, an inwardly facing second surface, and outwardly projecting first and second claws, the first and second claws being The axis of the rotational driving force receiving head forms a central symmetry; the first surface includes a concave spherical surface and a cutting plane located around the spherical surface, the first and second claws separating the cut surface into a first entry face and a second cut face; characterized in that

The surface of each of the claws has a occlusal surface for mating with the imaging device driving member and two sides for smooth transition of guiding, wherein the first side is adjacent to the second surface by the first bottom edge a second side is adjacent to the second surface by a second bottom edge, and the two sides are adjacent by abutting edge which is inclined with respect to the direction of the axis;

The intersection edge has a first end point and a second end point, the second end point is located on the second surface, and the first bottom edge and the second bottom edge intersect at the second end point;

The second end point is a point on the tab that is furthest from the axis, the first end point being closer to the axis than the second end point.
A drive assembly according to claim 5, wherein said axial adjustment assembly includes an adjustment slider, a groove member and a center shaft member, said rotary driving force receiving head being rotatably coupled to said axis about said axis Adjusting a slider, the groove member having upper and lower sliding grooves that are perpendicular to each other in a space, the adjusting slider forming a relative sliding fit with the upper sliding groove in a first direction; The gears have a common axis that forms a relatively sliding fit with the glide groove in a second direction; the first direction and the second direction are both perpendicular to the drum axis.
A drive assembly according to claim 5, wherein said elastic support member is a spring that is fitted over said central shaft member, said central shaft member being constituted by a head portion, a step portion and a rod portion, said head The portion cooperates with the sliding groove, and the step portion is located between the groove member and the spring.