CN214586401U - Driving head, photosensitive drum and processing box - Google Patents

Abstract

A driving head, a photosensitive drum and a processing box relate to the technical field of electronic photographic imaging equipment, wherein the driving head comprises a body and a driven rod which axially reciprocates relative to the body; a transverse partition wall is arranged in the body, one side of the transverse partition wall is provided with an accommodating cavity, the other side of the transverse partition wall is provided with a pair of elastic clamping jaws, the elastic clamping jaws axially extend from the transverse partition wall to be cantilever-shaped, and the maximum radial size of the elastic clamping jaws is smaller than the diameter of the accommodating cavity; the driven rod is provided with an axial limiting head matched with the pair of elastic claws. The photosensitive drum and the processing box are both provided with the driving head with the structure. The imaging device has the advantages of simple structure, convenience in assembly and high imaging quality.

Description

Driving head, photosensitive drum and processing box

Technical Field

The utility model relates to a drive head for transmitting revolving force reaches sensitization drum and processing box as its component part with this drive head.

Background

An image forming process of a laser printer, in which a process cartridge is a basic constituent core, is such that a photosensitive drum surface is uniformly charged by a charging roller. The laser scanner emits a modulated laser beam containing image information to the outer cylindrical surface of the photosensitive drum, and an electrostatic charge distribution diagram with difference distribution, namely an electrostatic latent image corresponding to an image to be printed, is formed on the cylindrical surface of the photosensitive drum after the laser beam is irradiated. Then, the developer such as toner transferred from the developing roller is adsorbed on the surface of the photosensitive drum in a state of being adjusted in layer thickness by the doctor blade, and the electrostatic latent image is covered and converted into a visible image which can be observed by naked eyes. With the rotation of the photosensitive drum, the visible image formed on the surface of the photosensitive drum by the carbon powder is transposed to the position of the transfer roller. The carbon powder in the form of visible image is transferred to the surface of the recording medium such as paper by the action of transfer voltage carried by the transfer roller, and then the carbon powder in the form of visible image on the recording medium is heated and pressed by the heating roller and the pressing roller, so that the carbon powder is infiltrated into the fiber layer of the recording medium, and the visible image formed by the carbon powder is permanently solidified on the recording medium. After the visible image on the photosensitive drum is transferred by the transfer roller, the residual carbon powder attached to the visible image is scraped to a waste powder collecting bin by a waste powder scraping blade, and the surface of the photosensitive drum is recovered to a standby state without electricity and dust after static electricity is eliminated by corresponding electricity eliminating equipment. This completes a basic imaging workflow. As a result of this flow of repeated loop operations, an image desired by the printer can be obtained.

U.S. patent document US2008/0152388a1 discloses a process cartridge having a spherical universal joint in a driving head at an end of a photosensitive drum. Such ball joints are prone to undesirable separation, particularly during transport, which is more likely to result in loss of transmission or operational instability of the ball joint.

As an improvement to the technical solution disclosed in US2008/0152388a1, the invention named as a torque transmission device and a process cartridge for a laser printer is disclosed in chinese patent application publication No. CN 103376696A. The driving head comprises a body and a driven rod, the driven rod comprises a guide post and an input head located on one side of the length direction of the guide post, the body is provided with a containing cavity, and the guide post is located in the containing cavity and can move in a reciprocating mode along the axial direction of the body.

CN103376696A provides a driving head, in which an input arm is provided on a body, a driven rod and the body are in a fit relationship that can move reciprocally in the axial direction or longitudinal direction of the body, and a limiting mechanism defines a moving area of the driven rod in the axial direction of the body, and an end cover which is a component of the limiting mechanism defines the position of the output arm in a containing cavity so that the driven rod is integrally fixed on the body. This kind of configuration, the input arm on the body accepts the rotary driving power that the output arm on the driven pole transmitted, make the body form rotatoryly, and then drive other working member entering rotation operating condition, and simultaneously, stop gear has injectd the removal region of driven pole in the body axial, inject the component part guide post of driven pole in the inside chamber that holds of body, avoided the risk that the driven pole drops from the body, thereby guarantee that whole moment of torsion receiving assembly has good reliability and stability when transmitting rotary driving power. The photosensitive drum and the processing box adopting the torque receiving assembly have the characteristics of the torque receiving assembly, and have the advantages of stable machine falling during installation, reliable performance during transmission of rotating force and stable work.

However, the driving head of CN103376696A is composed of four parts, i.e. a body, a force-bearing rod, a spring and a gland, which are assembled, the structure is complex, the assembly is also troublesome, and a further design for structural simplification is required, especially for some driving heads with smaller body diameter, the gland and the body are positioned by snap-fit arranged in the circumferential direction, which often results in the increase of the out-of-roundness of the body after the gland is assembled, leading to the problem of imaging quality, and therefore there is a need for further design improvement.

Disclosure of Invention

The utility model mainly aims at providing a driving head with simple structure and convenient assembly;

another object of the present invention is to provide a photosensitive drum constructed by the above driving head;

it is still another object of the present invention to provide a process cartridge constructed by the above photosensitive drum.

In order to achieve the main purpose, the driving head provided by the utility model is used for receiving the torque of the driving rod of the laser printer, and comprises a body and a driven rod which reciprocates in the axial direction relative to the body; a transverse partition wall is arranged in the body, an accommodating cavity is formed in one side of the transverse partition wall, a pair of elastic clamping claws are arranged on the other side of the transverse partition wall, the elastic clamping claws axially extend from the transverse partition wall to be cantilever-shaped, and the maximum radial size of the elastic clamping claws is smaller than the diameter of the accommodating cavity; the driven rod is provided with an axial limiting head matched with the pair of elastic claws.

It is visible by above scheme, the utility model discloses relative prior art has saved the gland, has eliminated the radial force of gland to body buckle department to can not influence the out-of-roundness of body, and improved the structure of body and driven pole, make the assembly of driving head simple relatively, convenient assembling is swift.

In a further aspect, the cross wall is a straight wall or a folded wall or a curved wall perpendicular to the axis when viewed in a cross section passing through the axis of the body. The design reduces the influence on the out-of-roundness of the body when the elastic claw is stressed as much as possible.

Still another further solution is that an annular wall surrounding the pair of elastic claws axially extends from the cross wall, and the diameter of the annular wall is smaller than that of the accommodating cavity. Less to the driving head diameter the utility model discloses, the diameter of elasticity jack catch is littleer, sets up the intensity that the annular wall can add the improvement elasticity jack catch, and the damage of elasticity jack catch and the failure of drive during operation elasticity jack catch when effectively preventing to assemble have further reduced the influence of driving head internals relative motion when simultaneously to the body out of roundness again.

Still a further scheme is that the body still includes the pipe portion, the pipe portion with a pair of elasticity jack catch is the central line and from the cross wall is along the axial towards hold chamber one side and extend, the driven pole have with pipe portion clearance fit's first slip section. This scheme makes the relative body of driven pole at the ascending removal of axial more stable.

A circular sliding hole is formed between the claw tips of the pair of elastic claws; the driven rod is provided with a second sliding section which is in clearance fit with the sliding hole.

A first alignment mark is arranged on a visible surface of a peripheral wall which surrounds the accommodating cavity; a second alignment mark is arranged on the visible surface of the driven rod; the first alignment mark and the second alignment mark are used for determining relative rotation angles between the driven rod and the body during the assembling process of the driven rod to the body.

In order to achieve the above another object, the present invention provides a photosensitive drum comprising a drum, wherein the driving head of any one of the above aspects is mounted at one end of the drum.

In order to realize the above further object, the utility model provides a processing box includes the box body install above-mentioned scheme on the box body the sensitization drum.

Drawings

FIG. 1 is a front view of a body in an embodiment of a drive head;

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a cross-sectional view B-B of FIG. 3;

FIG. 6 is a perspective view of the first perspective of FIG. 1;

FIG. 7 is a perspective view of FIG. 1 from a second perspective;

FIG. 8 is a cross-sectional view of another embodiment of a body;

FIG. 9 is a front view of a driven rod in an embodiment of the drive head;

FIG. 10 is a right side view of FIG. 9;

FIG. 11 is a left side view of FIG. 9;

FIG. 12 is a perspective view of the first view of FIG. 9;

FIG. 13 is a perspective view of FIG. 9 from a second perspective;

FIG. 14 is a block diagram of an embodiment of a drive head;

FIG. 15 is a cross-sectional view C-C of FIG. 14;

FIG. 16 is an exploded view of the structure of FIG. 14;

FIG. 17 is a schematic structural view of an embodiment of a photosensitive drum;

FIG. 18 is a schematic structural view of an embodiment of the process cartridge.

The present invention will be further described with reference to the following embodiments and accompanying drawings.

Detailed Description

The drawings are only schematic structural diagrams, and like reference numerals in the drawings denote like structures, and are particularly described with words if there are slight differences.

In addition, only the structure different from the prior art of the present invention will be described in detail below, and the working principle of the driving head itself and other structures related to the present invention, and the structures of the photosensitive drum and the process cartridge can be understood and implemented by those skilled in the art with reference to the disclosure of the prior art of the present invention, patent documents CN103376696A, CN104155864A, and the like.

Drive head embodiments

According to the utility model discloses a driving head is formed by the combination of body, driven pole and the three part of spring, and body structure wherein is as shown in fig. 1 to fig. 7.

Referring to fig. 1, the body 1 is substantially cylindrical in shape and is provided with a wheel-like tooth 18 for transmitting torque to other rotating members, and a pair of resilient jaws 13 are projected on the left side.

Referring to fig. 2, the body 1 has a receiving cavity 12 at one end, the receiving cavity 12 is substantially cylindrical, a small groove 151 is formed on an end surface of a peripheral wall 15 enclosing the receiving cavity 12, a pair of protruding strips 19 serving as receiving arms are radially and symmetrically formed inside the peripheral wall 15, and the guiding tube 16 is also a spring seat and is provided with a fixing groove 161 for circumferentially positioning an end of the spring.

Referring to fig. 3, a circular slide hole 17 is formed between the tips of the pair of elastic claws 13, and an annular wall 14 is provided around the pair of elastic claws 13.

Referring to fig. 4, a transverse wall 11 is provided in the main body 1, and the transverse wall 11 of this embodiment is a folded wall formed by two straight walls perpendicular to the axis of the main body 1 and a wall parallel to and connecting the two straight walls as viewed in fig. 4, and the transverse wall 11 is formed by combining two annular walls with a larger diameter and a smaller diameter and a cylindrical wall as viewed in space.

The right side of the transverse wall 11 is provided with a containing cavity 12, the left side is provided with a pair of elastic claws 13, the elastic claws 13 extend towards the left from the transverse wall 11 along the axial direction of the body 1 to form a cantilever structure based on the transverse wall 11, and the outline of the maximum cross section of the pair of elastic claws 13 is circular, and the diameter of the outline is smaller than that of the containing cavity 12. An annular wall 14 surrounding a pair of elastic jaws 13 also extends axially from the transverse wall 11, the diameter of the annular wall 14 also being smaller than that of the housing chamber 12. A small recess 151 is provided as a first alignment mark on the end face of the peripheral wall 15, and the small recess 151 will be explained in the description of the assembly process of the drive head. The body 1 further has a duct portion 16, and the duct portion 16 is disposed concentrically with the pair of elastic claws 16 and extends rightward from the cross wall 11, i.e., axially toward the accommodating chamber 12 side.

Referring to fig. 5 in conjunction with fig. 4, the cross-section of the resilient jaws 13 is a circular arc, which improves the bending strength of the resilient jaws, and slide holes 17 are provided at the tips of the jaws.

Referring to fig. 6 and 7, the structures of the body 1 at the two ends in the axial direction are reflected from different angles, so that the structural features and the positional relationship between the structural features and the structural features can be more clearly described.

Driven rod

The structure of the driven rod is shown in fig. 9 to 13.

Referring to fig. 9, the driven rod 2 has an axial limiting head 21 substantially engaged with the pair of elastic claws 13, and a second sliding section 22 in clearance fit with the sliding hole 17 and a first sliding section 23 in clearance fit with the conduit part 16 are arranged rightward in sequence. Further to the right side is a reinforcing cylinder 24, on the outer wall of which a pair of power bars 25 for transmitting torque, a sliding disk 26 in clearance fit with the accommodating chamber and a pair of input teeth 27 are symmetrically arranged. Wherein a small groove 28 is provided on the circumferential surface of the sliding plate 26 as a second alignment mark.

Referring to fig. 10, a pair of input teeth 27, as in the prior art, are provided to receive torque from the printer head.

Referring to fig. 11, a spring seat 29 is concentrically provided inside the reinforcing cylinder 24, and a fixing groove 291 for circumferentially positioning a spring fixing end is provided in the spring seat 29.

Referring to fig. 12 and 13, the structures of the driven rod 2 at the two ends in the axial direction are reflected from different angles, so that the structural features and the mutual positional relationship indicated by the reference numerals can be more clearly explained.

Driving head

Referring to fig. 14, the driving head 100 is assembled by the body 1, the driven rod 2 and a spring, and the assembled sliding disk 26 is located in the accommodating cavity 12 and is in clearance fit with the inner wall of the peripheral wall 15.

Referring to fig. 15, as in the prior art, the spring 3 is disposed in the accommodating chamber 12, the spring 3 is a compression spring and a torsion spring, both ends of the spring 3 are formed with straight rod hooks bent toward the center of the spring, one end 32 of the spring is sleeved on the spring seat 29 in the axial direction, the straight rod hooks are inserted into the fixing grooves 291, the other end 31 of the spring is sleeved on the guide pipe portion 16 serving as the spring seat, and the straight rod hooks are inserted into the fixing grooves 161. The driven rod 2 is limited when moving to the right relative to the body 1 in the axial direction in such a way that the end surface of the reinforcing cylinder 24 abuts against the transverse partition wall 11, and the driven rod 2 is limited when moving to the left relative to the body 1 in such a way that the limiting head 21 abuts against the claw tips of the elastic claws 13 as shown in fig. 15 under the action of the compression restoring force of the spring 3.

Assembly of drive head

Referring to fig. 16, in this embodiment, first, one end 31 of the spring 3 is inserted into the accommodating cavity 12 of the body 1 and is sleeved on the conduit part 16 in a manner that the straight rod of the end is hooked in the fixing groove 161, and then one end of the position limiting head 21 of the driven rod 2 is inserted into one end 32 of the spring 3, so that the end is sleeved on the fixing seat 291 in a manner that the straight rod is hooked in the fixing groove 291, and a pressure for moving the driven rod 2 toward the body 1 is applied in the axial direction, at this time, an included angle between the connecting line of the small groove 28 and the small groove 151 and the central line is about 120 degrees to 160 degrees as shown in fig. 14, before the power strip 25 passes over the convex strip 19 in the axial direction, after the driven rod 2 is rotated relative to the body 1 until the small groove 28 and the small groove 151 are aligned in the circumferential direction around the axis, the preset compression restoring force and torsion restoring force of the spring 3 are completed, and then the axial pushing force is applied to push the position limiting head 21 in the radial direction and pass through the pair of elastic claws 13, the assembly of the drive head 100 is completed after the stopper head 21 passes through.

Embodiment of photosensitive drum

Referring to fig. 17, since the present invention is mainly an improvement of the driving head 100, the photosensitive drum according to the present invention is provided with the driving head 100 at one end of the drum 200.

Process cartridge embodiment

Referring to fig. 18, also because the present invention is mainly an improvement of the driving head 100, the process cartridge according to the present invention is a process cartridge in which a photosensitive drum having the driving head 100 is rotatably installed between two end walls of a cartridge body 300.

Other embodiments

Only other embodiments of the drive head 100 will be described below.

Referring to fig. 8, since the present invention is a structural improvement of the body 1 with a relatively small diameter, the body 1 is mainly provided with the cross wall 11 and the pair of elastic claws 13, and the cross wall 11 can be designed into a straight wall form as shown in fig. 8, which has the advantage that the structure is simpler than the first example; the transverse wall 11 may also be designed in the form of a curved wall, for example a quadric wall, which has the advantage that breakage and undesired deformation of the resilient fingers 13 is relatively prevented.

Claims (8)

1. The driving head is used for receiving the torque of a driving rod of the laser printer and comprises a body and a driven rod which axially reciprocates relative to the body;

the method is characterized in that:

a transverse partition wall is arranged in the body, an accommodating cavity is formed in one side of the transverse partition wall, a pair of elastic clamping claws are arranged on the other side of the transverse partition wall, the elastic clamping claws axially extend from the transverse partition wall to be cantilever-shaped, and the maximum radial size of the elastic clamping claws is smaller than the diameter of the accommodating cavity;

the driven rod is provided with an axial limiting head matched with the pair of elastic claws.

2. The drive head of claim 1, wherein:

the cross walls are straight walls or folded walls or curved walls which are perpendicular to the axis when viewed from the section passing through the axis of the body.

3. The drive head of claim 1, wherein:

an annular wall surrounding the pair of elastic claws extends from the transverse partition wall in the axial direction, and the diameter of the annular wall is smaller than that of the accommodating cavity.

4. The drive head of claim 1, wherein:

the body still includes pipe portion, pipe portion with a pair of elasticity jack catch is the central line altogether and certainly the cross wall is followed the axial and is faced hold chamber one side and extend, the driven pole have with pipe portion clearance fit's first slip section.

5. The drive head of claim 1, wherein:

a circular sliding hole is formed between the claw tips of the pair of elastic claws;

the driven rod is provided with a second sliding section which is in clearance fit with the sliding hole.

6. The drive head according to any of claims 1 to 5, wherein:

a first alignment mark is arranged on a visible surface of the peripheral wall which surrounds the accommodating cavity;

a second alignment mark is arranged on the visible surface of the driven rod;

the first alignment mark and the second alignment mark are used for determining relative rotation angles between the driven rod and the body during the assembling process of the driven rod to the body.

7. Photosensitive drum, including the drum barrel, its characterized in that:

a drive head as claimed in any one of claims 1 to 6 mounted to one end of the drum.

8. Handle the box, including the box body, its characterized in that:

the cartridge body is mounted with the photosensitive drum of claim 7.

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