CN102736461B - A kind of driving component for photosensitive element - Google Patents

Abstract

The present invention relates to a photosensitive element driving assembly, comprising: a drum gear positioned at an end of a photosensitive element, a photosensitive drum driving head provided with a power receiving portion for receiving a driving force from an image forming device at one end, the drum gear and the photosensitive drum driving head There is a variable axial coupling between them. During the meshing process of the printer drive head and the photosensitive drum drive head, the rotation axis of the photosensitive drum drive head can be adjusted and changed adaptively according to the change of the rotation axis of the printer drive head, which solves the problem of the discrepancy between the rotation axis of the photosensitive drum and the printer drive head. Coaxiality affects the technical problem that the photosensitive drum drive head engages with the printer drive head and cannot transmit power smoothly after engagement.

Description

A photosensitive element drive assembly

technical field

The invention relates to an image forming device, in particular to a photosensitive element driving assembly in the image forming device.

Background technique

An electrophotographic image forming device such as a laser printer is a device that uses the principle of electrophotography to form an image on an image forming medium such as paper at least through charging, exposure, development, transfer, and fixing processes.

In the charging process, through the charging device, the surface of the photosensitive element such as the photosensitive drum is charged with a uniform predetermined charge by means of corona discharge; in the exposure process, the surface of the photosensitive element that has been charged with a uniform predetermined charge is selectively exposed. The exposed place, due to the photosensitive characteristics of the photosensitive element, the resistance drops, so the charge on the exposed place is grounded and eliminated, that is, after the exposure, the surface of the photosensitive element forms a pattern corresponding to the distribution of the charge that is to be formed. Electrostatic latent image; in the developing process, through the developing part, the developer used to form the visible image, such as carbon powder, is sent to the electrostatic latent image on the surface of the photosensitive element with the action of force such as electric field force, so that the above electrostatic The latent image is visualized; in the transfer process, the developer on the electrostatic latent image on the surface of the photosensitive element is transferred to the image forming medium such as paper by a transfer device, such as a transfer roller; The developer on the image forming medium is firmly attached to the image forming medium.

Usually, the process box is to accept the driving force of the image forming device through the photosensitive element driving assembly assembled at one end of the photosensitive element, and the existing photosensitive element driving assembly is shown in Figure 1, including drum gear 16 and photosensitive drum driving head 24a , photosensitive drum drive head 24a is provided with protrusion 17a, among the figure 30 is a printer motor, 20 is a driving gear, 34 is a driven gear, 18 is a printer drive head, and the printer drive head 18 is fixedly connected with the driven gear 34, 18a It is a groove for engaging with the protrusion 17a to transmit power, A is the rotation axis of the photosensitive drum, B is the rotation axis of the printer drive head, and 9 in the figure is the photosensitive drum.

When the printer is working, the motor 30 drives the driving gear 20 to rotate, the driven gear 34 transmits power by meshing with the driving gear 20, the driven gear 34 drives the printer driving head 18 to rotate, and the protrusions 17a and 18a mesh with the grooves to realize the drive of the printer. The driving force is transmitted to the photosensitive drum 9 .

The shortcoming that prior art exists:

Because the driving gear 20 and the driven gear 34 transmit power through unilateral meshing, there is a pressing force at the meshing position between the driving gear 20 and the driven gear 34, so that the driven gear 34 has a displacement along the vertical direction B, resulting in A and B are not coaxial, so that the groove 18a cannot engage with the protrusion 17a or cannot transmit power smoothly after the engagement.

Contents of the invention

The present invention provides a photosensitive element drive assembly to solve the problem that the photosensitive drum rotation axis and the printer drive head rotation axis are not coaxially affected by the existing photosensitive element drive assembly due to the drive gear of the printer and the driven gear transmitting power through unilateral meshing. The technical problem that the power cannot be transmitted smoothly after the drive head engages with the printer drive head.

In order to solve the above technical problems, the technical scheme that the present invention takes is:

A photosensitive element driving assembly, comprising: a drum gear located at the end of the photosensitive element, a photosensitive drum driving head provided with a power receiving part for receiving a driving force from an image forming device at one end, characterized in that the drum gear and the A variable axial coupling is arranged between the photosensitive drum drive heads.

The variable axial coupling includes a cross connector, a connector bracket and four bushings, the photosensitive drum drive head, the cross connector, the connector bracket and the drum gear are sequentially connected, and the photosensitive drum A pair of radially corresponding slide grooves and a pair of radially corresponding bosses perpendicular to the diameter where the slide grooves are located are provided on the end face where the other end of the drum drive head is connected to the drum gear. The connector bracket includes a disc, A pair of radially corresponding sliding grooves and a pair of radially corresponding bosses perpendicular to the diameter where the sliding grooves are located are provided on the end face of the disc connected to the cross connector. There are four radially symmetrically distributed arc-shaped keyways, the sleeve includes an outer edge and an inner ring, the outer diameter of the outer edge is larger than the outer diameter of the inner ring, and the inner diameter of the arc of the keyway is larger than the shaft The outer diameter of the inner ring of the sleeve, two of the four bushes are radially symmetrically connected to the cross connector and the connector bracket through the boss on the connector bracket, and the boss on the connector bracket The connected two shaft sleeves are respectively located in the sliding grooves on the photosensitive drum drive head, and the other two of the four shaft sleeves drive the cross connector and the photosensitive drum radially symmetrically through the bosses on the photosensitive drum drive head. The head is connected, and the two bushes connected with the boss on the photosensitive drum driving head are respectively located in the sliding grooves on the disc.

The variable axial coupling is a spring, one end of the spring is coaxially fixedly connected with the drum gear, and the other end is coaxially fixedly connected with the photosensitive drum driving head.

A central shaft is provided on the end face of the disc connected to the drum gear, and a torsion spring with one end abutting against the drum gear and the other end clamped to the connector bracket is sleeved on the central shaft.

Limiting blocks are provided on the bottom edge of the disc, and a limiting portion matching the limiting block is provided at a corresponding position of the drum gear.

The drum gear is provided with a central through hole, and the end of the central shaft away from the disk is provided with a locking position. After the central shaft passes through the central through hole, the drum gear and the locking position are matched by a snap spring and the locking position. The connector bracket is clamped.

After adopting the above-mentioned technical scheme, since a variable axial coupling is arranged between the drum gear and the drive head, the rotating shaft of the photosensitive drum drive head can be driven by the printer during the meshing process of the printer drive head and the photosensitive drum drive head. The change of the rotation axis of the head can be adjusted and changed adaptively, which solves the difference between the rotation axis of the photosensitive drum and the rotation axis of the printer drive head due to the power transmission of the driving gear and the driven gear of the printer through unilateral meshing of the existing photosensitive element drive assembly. The shaft affects the technical problem that the photosensitive drum drive head engages with the printer drive head and cannot transmit power smoothly after engagement.

Description of drawings

FIG. 1 is a schematic diagram of the cooperation between the conventional photosensitive element driving assembly and the printer driving head.

FIG. 2 is an exploded schematic diagram of a photosensitive element driving assembly in Embodiment 1 of the present invention.

Fig. 3a is a perspective view of the driving head in Embodiment 1 of the present invention.

Fig. 3b is a perspective view of the driving head viewed from another direction in Embodiment 1 of the present invention.

Fig. 4 is a perspective view of a cross connector in Embodiment 1 of the present invention.

Fig. 5 is a perspective view of a shaft sleeve in Embodiment 1 of the present invention.

Fig. 6a is a perspective view of a connector bracket according to an embodiment of the present invention.

Fig. 6b is a perspective view of the connector bracket viewed from another direction in the first embodiment of the present invention.

Fig. 7 is a schematic diagram of the assembled structure among the cross connector, the bushing and the connector bracket in the first embodiment of the present invention.

Fig. 8 is a schematic diagram of the connection between the cross-shaped connector, the shaft sleeve and the connector bracket and then the photosensitive drum drive head after assembly in Embodiment 1 of the present invention.

FIG. 9 is a schematic diagram of the connection between the cross connector, the bushing, the connector bracket and the photosensitive drum driving head in Embodiment 1 of the present invention.

Fig. 10 is a schematic diagram of the assembly of the photosensitive drum drive head and the machine drive head in Embodiments 1 and 2 of the present invention.

FIG. 11 is an exploded schematic view of the photosensitive element driving assembly in Embodiment 2 of the present invention.

Detailed ways

Embodiment one

As shown in Figure 2, a photosensitive element driving assembly includes: a drum gear 1 located at the end of the photosensitive element, a photosensitive drum driving head 2 for receiving driving force from an image forming device, and a photosensitive drum drive head 2 arranged on the drum gear 1 and the photosensitive drum. A variable axial coupling between the drive heads 2, the variable axial coupling includes a cross connector 3, a connector bracket 4 and four identical shaft sleeves 5.

As shown in Figures 3a and 3b, one end of the photosensitive drum driving head 2 is provided with a power receiving part 2a for engaging with the groove 18a of the machine driving head to receive the driving force from the image forming device, and the other end is connected to the end face of the drum gear 1 A pair of radially corresponding bosses 2b and a pair of radially corresponding slide grooves 2c are provided on the top.

As shown in Figure 4, the cross connector 3 is provided with four radially symmetrically distributed arc-shaped key grooves 3a; as shown in Figure 5, the sleeve 5 includes an outer edge part 5a and an inner ring 5b; Figures 6a, 6b As shown, the connector bracket 4 includes a disc 4a and a central shaft 4b, and the outer end surface of the disc 4a is provided with the same pair of radially corresponding bosses 4a1 and a pair of radially corresponding sliding grooves as the photosensitive drum drive head 2 4a2, a pair of limit blocks 4a3 are also provided in the symmetrical direction of the bottom edge of the disc 4a, a pair of limit parts matching the limit blocks 4a3 are provided at the corresponding position of the drum gear 1, and the end of the central axis 4b away from the disc 4a is provided with Card position 4b1. The inner diameter of the arc of the keyway 3a is larger than the outer diameter of the inner ring 5b of the sleeve, so that the cross connector 3 has a movable gap along the direction of the keyway 3a, and the outer diameter of the outer edge part 5a is larger than the outer diameter of the inner ring 5b; as shown in Figure 7, four Two of the two axle sleeves 5 are radially symmetrical to cover the cross connector 3 on the connector bracket 4 through the boss 4a1 on the connector bracket 4, and the two axle sleeves connected with the boss 4a1 on the connector bracket 4 5 are respectively located in the sliding groove 2c on the photosensitive drum drive head, that is, the cross connector 3 is fixed in the axial direction of the connector bracket 4; similarly, the other two of the four pass through the photosensitive drum radially and symmetrically The boss 2b on the drive head 2 covers the cross connector 3 on the photosensitive drum drive head 2, and the two bushings 5 connected with the boss 2b on the photosensitive drum drive head are respectively located in the sliding grooves 4a2 on the disc 4a , that is, the cross connector 3 is fixed in the axial direction of the photosensitive drum drive head 2, so that the photosensitive drum drive head 2 is fixedly connected with the connector bracket 4, as shown in Figure 9, and Figure 8 is the photosensitive drum drive head 2 Schematic diagram of assembly with connector bracket 4.

The drum gear 1 is provided with a central through-hole, and the central shaft 4b passes through the through-hole, and is fixedly connected with the drum gear 1 by clamping to the clamping position 4b1 through the circlip 7 . A torsion spring 6 can also be arranged between the connector bracket 4 and the drum gear 1 to increase the buffering function of the photosensitive drum driving element. FIG. 10 is a schematic diagram of the assembly of the photosensitive drum driving head of the photosensitive drum and the photosensitive drum driving head of the machine in this embodiment.

To sum up, the photosensitive drum drive head 2 and the connector bracket 4 are fixedly connected through the cross-shaped connector 3 and the bushing 5, because the cross-shaped connector 3 has movable gaps along the direction of the four key grooves 3a, so that the photosensitive drum drive head 2 Relative to the connector bracket 4, it is movable along the direction of the keyway 3a; the connector bracket 4 is fixed on the drum gear 1 through the snap spring 7, because the limit part (not shown) is set on the drum gear 1 and the limit position is set on the connector bracket 4 The block 4a3 cooperates, thereby restricting the axial rotation between the photosensitive drum drive head 2 and the connector and the drum gear 1 bracket 4; by setting the torsion spring between the drum gear 1 and the connector bracket 4, the power receiving part 2a and the machine can be reduced. After the drive head is engaged, the power receiving part 2a or the machine drive head is damaged due to the impact force at the moment of starting the printer.

Embodiment two

As shown in Figure 11, a photosensitive element driving assembly includes: a drum gear 1 located at the end of the photosensitive element, a photosensitive drum driving head 2 for receiving driving force from an image forming device, and a photosensitive drum drive head 2 arranged on the drum gear 1 and the photosensitive drum. The variable axial coupling between the driving heads is a spring 8, one end of the spring 8 is coaxially fixedly connected with the drum gear 1, and the other end is coaxially fixedly connected with the photosensitive drum driving head 2. FIG. 10 is a schematic diagram showing the assembly of the photosensitive drum, the photosensitive drum driving head and the photosensitive drum driving head of the machine in this embodiment.

Claims (7)

1. a driving component for photosensitive element, comprise: be positioned at the drum gear of photo-sensitive cell end, photosensitive drum driving head that one end is provided with the power reception portion for receiving the driving force from image processing system, it is characterized in that, between described drum gear and described photosensitive drum driving head, be provided with the shaft coupling of variable axial, and the shaft coupling of described variable axial comprises cross connector, connector holder and axle sleeve, described cross connector is provided with four arc shaped keyslots of radial symmetry distribution, the quantity of described axle sleeve is four, cross connector is connected with connector holder by the boss on connector holder by described four axle sleeves two radially symmetrically, two axle sleeves be connected with the boss on described connector holder lay respectively in the sliding tray on photosensitive drum driving head, cross connector is connected with photosensitive drum driving head by the boss on photosensitive drum driving head by described four axle sleeves another two radially symmetrically, two axle sleeves be connected with the boss on described photosensitive drum driving head lay respectively in the sliding tray on disk.

2. driving component for photosensitive element as claimed in claim 1, it is characterized in that, described photosensitive drum driving head one end is provided with power receiving portion; The boss vertical with the diameter at described sliding tray place that the described photosensitive drum driving head other end is corresponding with a pair radial direction with the end face that drum gear connects being provided with a pair radial corresponding sliding tray.

3. driving component for photosensitive element as claimed in claim 1, it is characterized in that, described connector holder comprises disk, the boss vertical with the diameter at described sliding tray place that described disk is corresponding with a pair radial direction with one end end face that cross connector connects being provided with a pair radial corresponding sliding tray.

4. driving component for photosensitive element as claimed in claim 1, it is characterized in that, described axle sleeve comprises outer portion and inner ring, and the external diameter in described outer portion is greater than the external diameter of inner ring, and the internal diameter of described keyway circular arc is greater than the external diameter of axle sleeve inner ring.

5. driving component for photosensitive element as claimed in claim 3, it is characterized in that, one end end face that described disk is connected with drum gear is provided with central shaft, described central shaft is socketed with one end and is connected to drum gear, the other end is connected in the torsion spring of described connector holder.

6. driving component for photosensitive element as claimed in claim 5, is characterized in that, described disk bottom edge be provided with limited block, the correspondence position of described drum gear is provided with the limiting section mated with described limited block.

7. the driving component for photosensitive element as described in claim 5 or 6, it is characterized in that, described drum gear is provided with central through hole, described central shaft is provided with screens away from one end of disk, and described central shaft to be crossed described drum gear and described connector holder clamping after described central through hole by jump ring and clamping matching.