CN103376683A

CN103376683A - Transmission assembly of photosensitive drums

Info

Publication number: CN103376683A
Application number: CN2012101251563A
Authority: CN
Inventors: 黄世雄; 陈心怡
Original assignee: General Plastic Industrial Co Ltd
Current assignee: General Plastic Industrial Co Ltd
Priority date: 2012-04-25
Filing date: 2012-04-25
Publication date: 2013-10-30
Anticipated expiration: 2032-04-25
Also published as: CN103376683B

Abstract

The invention discloses a transmission assembly of photosensitive drums, which comprises a shell, a connector and a transmission bar, wherein the shell is used for being fixedly connected with a photosensitive drum, the connector is separably arranged in the shell, and the transmission bar is driven by a drive shaft in a printer; two convex blocks and at least one convex rib of the shell are respectively clamped in two clamping hooks and at least one clamping groove of the connector; the connector is also provided with a channel and a limiting part, the limiting part is located in the channel, the transmission bar is provided with a first end part, a raised part and a second end part, the first end part is located between the limiting part and the bottom of the shell, the raised part is protruded from the first end part and located in a limiting groove of the connector, and the second end part convexly extends out the second end part of the connector. Therefore, when the transmission assembly is arranged in the photosensitive drum for the first time, or replaced onto a new photosensitive drum by a user, the problem of difficult installation or removing does exist.

Description

Transmission assembly of photosensitive drum

Technical Field

The present invention relates to a photosensitive drum for a printer, and more particularly to a transmission assembly for a photosensitive drum.

Background

Please refer to U.S. patent No. 7885575, which discloses a transmission assembly of a photosensitive drum, wherein a transmission rod is disposed in a cylindrical housing through a ball and a pin, such that the transmission rod can swing in various directions relative to the housing but cannot rotate, and a cover is fixed to one end of the housing, such that the transmission rod can only move axially in a small distance. Thus, the transmission rod can be driven by a driving shaft in a printer to rotate, so that a photosensitive drum fixedly connected with the shell rotates.

When the photosensitive drum is damaged, by using the method provided by the aforementioned patent, a user can take out the transmission rod, the ball body and the bolt together from the housing and install the transmission rod into the housing fixedly arranged on the new photosensitive drum; however, the removal and installation operations described above are difficult to perform in practice.

In fact, because of the problem of difficult installation, before the photosensitive drum leaves factory, the assembly personnel firstly assemble the whole transmission assembly and then fix the shell to the photosensitive drum, but the installation position and the swinging characteristic of the transmission rod make the fixing action not easy to be executed.

In other words, the transmission assembly of the prior art photosensitive drum has a problem of being difficult to install or disassemble when the photosensitive drum is first installed on the photosensitive drum or when a user is allowed to replace the photosensitive drum with a new one, and thus, the transmission assembly of the prior art photosensitive drum still needs to be improved.

Disclosure of Invention

In view of the above-mentioned disadvantages, it is a primary object of the present invention to provide a transmission assembly for a photosensitive drum, which can effectively improve the disadvantages of the transmission assembly of the conventional photosensitive drum.

To achieve the above object, the driving assembly of the photosensitive drum provided by the present invention comprises a housing, a coupling member, and a driving rod. The shell is provided with a bottom and an opening which are opposite, an inner surface positioned between the opening and the bottom, two convex blocks protruding out of the inner surface, and at least one convex rib positioned at the bottom, wherein each convex block is provided with a bottom surface facing the bottom. The connector has a first end and a second end opposite to each other, a channel extending from the first end to the second end, an inner wall surface in the channel, a limiting groove recessed from the inner wall surface, two hooks protruding outward, at least one clamping groove recessed from the first end to the second end, and a limiting portion in the channel, wherein the limiting groove has an inlet at the first end, the connector is detachably disposed in the housing, the first end of the connector faces the bottom of the housing, the two hooks are respectively clamped on the bottom surfaces of the two lugs of the housing, and the clamping groove is clamped with the rib of the housing. The transmission rod is provided with a first end part arranged in the channel of the combining piece, a second end part protruding out of the second end of the combining piece and at least one protruding part protruding out of the first end part, the first end part is limited between the limiting part of the combining piece and the bottom of the shell, and the protruding part is positioned in the limiting groove of the combining piece.

Therefore, the second end of the transmission rod can be driven to rotate by a driving shaft in a printer so as to drive the combining piece and the shell to rotate and further drive a photosensitive drum fixedly connected with the shell to rotate. The assembly mode of the photosensitive drum using the transmission assembly is that the transmission rod and the combining piece are combined with each other, the shell is fixedly arranged on the photosensitive drum, then the combining piece is combined with the shell, and the transmission assembly can be easily combined or separated with the shell by an assembling person or a user. Therefore, the transmission assembly has no problem of difficult installation or disassembly no matter the transmission assembly is installed on the photosensitive drum for the first time or the transmission rod and the combination piece are replaced by a new photosensitive drum and a new shell by a user.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

FIG. 1 is a perspective assembly view of a first preferred embodiment of the present invention;

FIG. 2 is an exploded perspective view of the first preferred embodiment of the present invention;

FIG. 3 is a side view of the housing in the first preferred embodiment of the present invention;

FIG. 4 is a cross-sectional view of FIG. 3 taken along section line 4-4;

FIG. 5 is a perspective view of a coupling member according to the first preferred embodiment of the present invention;

FIG. 6 is a side view of the coupling member according to the first preferred embodiment of the present invention;

FIG. 7 is a cross-sectional view of FIG. 6 taken along section line 7-7;

FIG. 8 is an exploded perspective view of the coupling member and a driving rod according to the first preferred embodiment of the present invention;

FIG. 9 is a perspective assembly view of the transmission rod according to the first preferred embodiment of the present invention;

FIG. 10 is a cross-sectional view of the first preferred embodiment of the present invention;

FIG. 11 is an exploded perspective view of a second preferred embodiment of the present invention;

FIG. 12 is a cross-sectional view of the housing of FIG. 11 taken along section line 12-12;

FIG. 13 is a side view of the housing in accordance with the second preferred embodiment of the present invention;

FIG. 14 is an exploded perspective view of a third preferred embodiment of the present invention; and

FIG. 15 is a side view of a housing according to the third preferred embodiment of the present invention.

Wherein,

10 transmission assembly of photosensitive drum

20 bottom of the housing 22

222 rib 24 opening

26 inner surface 27 support

272 outer peripheral surface 28 projections

282 bottom surface 286 guide ramp

288 top 29 spring

30 first end of the engaging member 31

32 second end 33 channel

34 inner wall surface 35 outer wall surface

36 clamping groove and 37 limiting groove

372 inlet

38 limiting part 382 limiting inclined plane

39 resilient portion 392 hook

40 drive rod 41 body

42 sphere 43 rod body

44 first end 46 projection

48 second end portion

Detailed Description

The technical content and the characteristics of the invention will be described in detail by the listed embodiments and the attached drawings, wherein:

FIG. 4 is a cross-sectional view of FIG. 3 taken along section line 4-4; FIG. 5 is a perspective view of a coupling member according to the first preferred embodiment of the present invention;

FIG. 7 is a cross-sectional view of FIG. 6 taken along section line 7-7;

Referring to fig. 1 and 2, the driving assembly 10 of the photosensitive drum of the present invention includes a housing 20, a connecting member 30, and a driving rod 40.

As shown in fig. 3 and 4, the housing 20 has a bottom 22 and an opening 24 opposite to each other, an inner surface 26 located between the opening 24 and the bottom 22, a supporting portion 27 located at the center of the bottom 22, and two protrusions 28 protruding from the inner surface 26. The bottom 22 has four ribs 222, and the ribs 222 are equidistantly and radially distributed. Each of the protrusions 28 has a bottom surface 282 facing the bottom 22, and a guiding inclined surface 286 facing the opening 24, the guiding inclined surface 286 and the bottom surface 282 being respectively located on two sides of a top end 288 of the protrusion 28.

As shown in fig. 5 to 7, the joint 30 has a first end 31 and a second end 32 opposite to each other, a channel 33 extending from the first end 31 to the second end 32, an inner wall surface 34 located in the channel 33, an outer wall surface 35 opposite to the inner wall surface 34, four engaging grooves 36 recessed from the first end 31 toward the second end 32 and opened on the inner wall surface 34, two limiting grooves 37 recessed from the inner wall surface 34, two limiting portions 38 located in the channel 33 and separated by the two limiting grooves 37, and two elastic portions 39 extending from the second end 32 toward the first end 31 and inclined outward, and the ends of the two elastic portions 39 respectively have an outwardly protruding engaging hook 392.

As shown in fig. 8 and 9, the transmission rod 40 includes a body 41, a hollow sphere 42, and a rod 43. The main body 41 is first inserted through the channel 33 of the connector 30 at one end thereof and then sleeved with the ball 42 to form a spherical first end 44, the rod 43 is then inserted through the main body 41 and the ball 42 to combine the two, and two ends of the rod 43 form two protrusions 46 extending from the first end 44 in two opposite directions. Wherein the first end portion 44 is located in the channel 33, and the two protruding portions 46 respectively extend into the two limiting grooves 37. The driving rod 40 also has a second end 48 located at the body 41 and protruding out of the second end 32 of the engaging member 30.

The position-limiting portion 38 of the engaging member 30 is used to prevent the first end portion 44 of the transmission rod 40 from separating from the second end 32 of the channel 33. In the embodiment, the limiting portions 38 of the engaging member 30 are close to the second end 32 and integrally protrude from the inner wall surface 34, and each limiting portion 38 has a limiting inclined surface 382 (as shown in fig. 7) inclined inward from the joint with the inner wall surface 34 toward the second end 32. As shown in fig. 6 to 8, each of the limiting grooves 37 has an inlet 372 at the first end 31 for the protrusion 46 of the driving rod 40 to enter, and each of the limiting grooves 37 penetrates through the inner wall surface 34 and the outer wall surface 35, so that each of the protrusions 46 can more easily enter the limiting groove 37. However, the shape of each of the position-limiting portions 38 is not limited thereto, and each of the position-limiting grooves 37 may not penetrate the outer wall surface 35.

In addition, each of the position-limiting portions 38 may not be integrally formed with the connecting member 30, but may be formed by a position-limiting member (not shown) disposed at the second end 32 of the connecting member 30, and the transmission rod 40 may also be integrally formed.

As shown in fig. 2, the connector 30 is first coupled to the transmission rod 40, and then the first end 31 of the connector is disposed in the housing 20 toward the bottom 22 of the housing 20, and the housing 20 is fixed to one end of a photosensitive drum (not shown). During the process of combining the connector 30 with the housing 20, the two elastic portions 39 move along the guiding inclined planes 286 of the two protrusions 28, and swing inward under the force, until the two hooks 392 are engaged with the bottom surfaces 282 of the two protrusions 28 (as shown in fig. 10), and the engaging grooves 36 are engaged with the protruding ribs 222. In this way, the engaging member 30 is fixed to the housing 20, and the first end 44 of the transmission rod 40 is limited between the limiting portion 38 and the bottom portion 22, so that the transmission rod 40 can only move axially within a small distance, and the transmission rod 40 can only rotate within a small angle range because the protrusion 46 is limited by the limiting groove 37. Thus, the second end 48 of the transmission rod 40 is driven by a driving shaft (not shown) in the printer to rotate, so as to drive the engaging member 30, the housing 20 and the photosensitive drum to rotate. The guide ramp 286 may be eliminated as desired.

Before the photosensitive drum using the transmission assembly 10 provided by the present invention is shipped, the assembly personnel can fix the housing 20 to the photosensitive drum independently, which is easy to achieve because the assembly personnel is not hindered by the transmission rod 40. Moreover, the manufacturer can provide the photosensitive drum and the housing 20 fixed to each other, so that the user can remove the old fastener 30 and the transmission rod 40 and install the new housing 20. The assembling person or user can easily combine the housing 20 and the combining member 30 by inserting the combining member 30 into the housing 20 with the elastic portion 39 thereof aligned with the protrusion 28 of the housing 20. In addition, the user only needs to pull the transmission rod 40 outward, so that the elastic portion 39 of the engaging member 30 is forced to swing inward in an elastically deformed manner, and the two hooks 392 are separated from the two protrusions 28. In other words, the transmission assembly 10 does not have the problem of being difficult to install or to remove, either when first installed on a photoreceptor drum or when the user replaces the transmission rod 40 and the coupler 30 with a new photoreceptor drum and housing 20.

In the first preferred embodiment, the engaging member 30 is elastically deformable and inwardly swung by the elastic portion 39 to achieve the effect of engaging with and disengaging from the housing 20, however, the engaging manner of the engaging member 30 and the housing 20 is not limited thereto.

For example, referring to fig. 11, in the transmission assembly of the photosensitive drum according to the second preferred embodiment of the present invention, the hook 392 of the engaging member 30 is fixed, the housing 20 has two elastic portions 29, the two protrusions 28 of the housing 20 for engaging with the hook 392 are respectively located at the inner edges of the two elastic portions 29 (as shown in fig. 12), and the two elastic portions 29 can be forced to elastically deform and swing outwards, so that the two hook 392 and the two protrusions 28 can be engaged with and disengaged from each other.

In the first preferred embodiment, the rib 222 of the housing 20 is connected to an outer peripheral surface 272 of the supporting portion 27 (as shown in fig. 3), but does not extend to the inner surface 26, and the engaging groove 36 of the engaging member 30 is disposed on the inner wall surface 34, but does not penetrate the outer wall surface 35 (as shown in fig. 5). However, as shown in fig. 11 to 13, the rib 222 of the housing 20 may extend from the outer peripheral surface 272 of the supporting portion 27 to the inner surface 26, and the engaging groove 36 of the engaging member 30 may penetrate the inner wall surface 34 and the outer wall surface 35. The support portion 27 may not be provided.

Alternatively, as shown in fig. 14 and 15, in a third preferred embodiment of the present invention, the rib 222 of the housing 20 may be connected to the inner surface 26 and not extend to the outer peripheral surface 272 of the supporting portion 27, and the engaging groove 36 of the engaging member 30 may be disposed on the outer wall surface 35 and not penetrate through the inner wall surface 34. Moreover, the housing 20 and the connecting member 30 can have only two protruding ribs 222 and two engaging grooves 36, and in fact, the housing 20 and the connecting member 30 only have at least one protruding rib 222 and at least one engaging groove 36.

Finally, it should be noted that the components disclosed in the above embodiments are merely exemplary and are not intended to limit the scope of the present disclosure, and other equivalent components may be substituted or modified within the scope of the present disclosure.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A drive assembly for a photosensitive drum, comprising:

a shell, which is provided with a bottom and an opening which are opposite, an inner surface positioned between the opening and the bottom, two convex blocks which are protruded out of the inner surface, and at least one convex rib positioned at the bottom, wherein each convex block is provided with a bottom surface facing the bottom;

a connecting member having a first end and a second end opposite to each other, a channel extending from the first end to the second end, an inner wall surface in the channel, a limiting groove recessed from the inner wall surface, two hooks protruding outward, at least one slot recessed from the first end toward the second end, and a limiting portion in the channel, wherein the limiting groove has an inlet at the first end, the connecting member is disposed in the housing separately from the housing, the first end of the connecting member faces the bottom of the housing, the two hooks are respectively engaged with the bottom surfaces of the two protrusions of the housing, and the slot is engaged with the protruding rib of the housing; and

a transmission rod having a first end portion disposed in the channel of the connector, a second end portion protruding out of the second end of the connector, and at least a protruding portion protruding from the first end portion, wherein the first end portion is limited between the limiting portion of the connector and the bottom of the housing, and the protruding portion is located in the limiting groove of the connector.

2. The driving assembly of a photosensitive drum according to claim 1, wherein the coupling member has an outer wall surface opposite to the inner wall surface, and the limiting groove penetrates through the inner wall surface and the outer wall surface.

3. The driving assembly of a photosensitive drum according to claim 1, wherein the coupling member has two elastic portions extending from the second end toward the first end, the two hooks are respectively located on the two elastic portions, and the two elastic portions are elastically deformed by a force applied thereto so as to separate the two hooks from the two protrusions.

4. The driving assembly of a photosensitive drum according to claim 1, wherein each of the projections of the housing has a guide slope facing the opening of the housing, the guide slope and the bottom surface being located on both sides of the top end of the projection, respectively.

5. The driving assembly of a photosensitive drum according to claim 1, wherein the housing has two elastic portions, the two protrusions are respectively located on the two elastic portions, and the two elastic portions are elastically deformed by a force applied to the two elastic portions, so that the two hooks are separated from the two protrusions.

6. The driving assembly as claimed in claim 1, wherein the housing has four ribs formed on a bottom thereof, the ribs are radially spaced from each other, and the engaging member has four engaging grooves respectively engaging with the ribs.

7. The driving assembly of a photosensitive drum according to claim 1, wherein the housing further has a support portion at a center of a bottom thereof, the support portion having an outer peripheral surface, the protruding rib of the housing being connected to the outer peripheral surface, the engaging groove of the engaging member being provided on the inner wall surface.

8. The driving assembly of a photosensitive drum according to claim 7, wherein the ribs of the housing are further connected to the inner surface, the engaging member has an outer wall surface opposite to the inner wall surface, and the engaging groove of the engaging member penetrates through the inner wall surface and the outer wall surface.

9. The driving assembly of a photosensitive drum according to claim 1, wherein the rib of the housing is connected to the inner surface, the engaging member has an outer wall surface opposite to the inner wall surface, and the engaging groove of the engaging member is formed in the outer wall surface.

10. The driving assembly as claimed in claim 1, wherein the driving rod comprises a body, a ball disposed at one end of the body to form the first end, and a rod passing through the body and the ball, and two ends of the rod protrude from the ball to form two protruding portions.