JPH11160968A - Image forming device - Google Patents

Abstract

(57) Abstract: A mechanism for reciprocating a charging roller cleaning member and a photoreceptor cleaning member together with a relatively simple structure is provided so that it can be manufactured at low cost. SOLUTION: A cam mechanism 10 is provided on a cleaning blade 2.
Of the first rolling contact roller 11 with the blade holding member 13 and the support shaft 1
8 and the charging roller cleaning member 4
The rolling contact rollers 12 are attached via the cleaning holding members 14, respectively. Further, the first rolling contact roller 11 and the second
One cam member 15 is provided which is in contact with the rolling contact rollers 12 and which forms the cam portion 16 of the cam mechanism 10 for reciprocating the rolling contact rollers in the axial direction of the charging roller 3. Then, the cleaning blade 2 and the charging roller cleaning member 4 can be reciprocated by only one cam member 15, so that the cost can be reduced accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a photosensitive member cleaning member for cleaning the surface of a photosensitive member and a charging roller cleaning member for cleaning the surface of a charging roller, both of which reciprocate in the axial direction of the charging roller. The present invention relates to a possible image forming apparatus.

[0002]

2. Description of the Related Art An electrophotographic image forming apparatus is provided with a charging device for charging the surface of a photoreceptor. In recent years, the charging device has been changed from a corona discharge type to a charging roller. 2. Description of the Related Art Contact-charging type charging devices, which perform charging in a state where they are in contact with, have advantages such as low generation of ozone, and have been increasingly used. In such a contact charging type charging device, the charging is performed while the charging roller is in contact with the photoreceptor, so that the residual toner remaining on the photoreceptor after transferring the image on the photoreceptor to transfer paper is transferred to the charging roller. May cause charging failure.

Therefore, in a contact-charging type charging device that performs charging in a state where the charging roller is in contact with the photosensitive member, a charging roller cleaning member made of, for example, a sponge or the like is made to bite into the surface of the charging roller in an appropriate amount. When the charging roller is rotated, the surface of the charging roller is rubbed with a charging roller cleaning member to remove extraneous matter (foreign matter) such as toner and paper powder adhered to the surface (for example, JP-A-2-272594).

However, even if a charging roller cleaning member for cleaning the surface of the charging roller is provided, the toner continuously adheres to the same position between the charging roller and the charging roller cleaning member, When a foreign object such as a lump enters,
The surface of the charging roller may locally cause abnormal wear corresponding to the portion. Therefore, in a charging device provided with such a charging roller cleaning member, the charging roller cleaning member is reciprocally movable in the longitudinal direction of the charging roller.

For example, in an image forming apparatus described in Japanese Patent Application Laid-Open No. Hei 7-110618, a charging roller cleaning member is held in a reciprocating manner via a holder in the longitudinal direction of the charging roller cleaning member, and the holder is held by the holder. A cam follower formed at one end of the groove is engaged with a groove cam formed continuously over the entire circumference of the flange portion of the photosensitive member,
Each time the photosensitive member makes one rotation, the charging roller cleaning member makes one reciprocation.

[0006]

However, even if the surface of the charging roller is cleaned by the charging roller cleaning member, toner, paper dust, and the like remain between the photoconductor and the photoconductor cleaning member that cleans the surface. The photoreceptor cleaning member also needs to be reciprocated in the longitudinal direction of the photoreceptor in the same manner as the charging roller cleaning member, in order to prevent such a situation. Was. As described above, in order to prevent problems due to residual toner and paper dust, it was necessary to provide a mechanism for reciprocating both the charging roller cleaning member and the photosensitive member cleaning member. There has been a problem that the structure becomes complicated and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can be manufactured at a low cost by using a relatively simple mechanism for reciprocating the charging roller cleaning member and the photosensitive member cleaning member together. The purpose is to be.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a photosensitive member, a photosensitive member cleaning member for cleaning the surface of the photosensitive member, and charging of the photosensitive member in contact with the photosensitive member. Image forming apparatus comprising: a charging roller for cleaning; and a charging roller cleaning member for cleaning the surface of the charging roller, wherein both the photosensitive member cleaning member and the charging roller cleaning member are provided so as to be reciprocally movable in the axial direction of the charging roller. Is configured as follows.

That is, the first follower of the cam mechanism is attached to the photoreceptor cleaning member, and the second follower of the cam mechanism is attached to the charging roller cleaning member directly or via an intermediate member. The image forming apparatus is provided with one cam member which forms an original section of a cam mechanism which contacts the joint and the second follower and reciprocates the first and second followers in the axial direction. Constitute.

According to this image forming apparatus, one of the cam mechanisms is used.
With only one cam member, the first follower and the second follower that are in contact with the original section formed on the cam member are reciprocated in the axial direction of the charging roller. Since the configuration can be simplified as compared with the case where the roller cleaning member is reciprocated in the axial direction of the charging roller by different mechanisms, the cost can be reduced accordingly.

A base of the cam member is formed in a substantially disk shape, and a ridge portion respectively contacting the first follower and the second follower on a plane formed in the disk shape. It is preferable that the above-described original having a valley is formed, and the first follower and the second follower are respectively in contact with different positions in the circumferential direction of the original. In this case, the cam member can be easily manufactured by molding with a resin, so that the cost is reduced.

Further, a first spring for pressing a first follower of the cam mechanism against the original and a second spring for pressing a second follower against the original are provided. It is preferable to make the urging force of the second spring different from that of the second spring. With this configuration, the biasing forces of the first spring and the second spring are different, so that the follower pressed against the original by the spring having the stronger urging force has a peak and a valley of the original. The follower, which moves along the part, but is pressed against the original by the spring with the weaker biasing force, only the part of the spring whose biasing force is weaker while moving from the peak to the valley of the original There is a part that does not follow the surface of the original section but floats from that surface. Therefore, by changing the urging force of the first spring and the second spring, the speed of the reciprocating movement of the first follower and the second follower can be set without changing the shape of the original follower. Can be changed to

It is preferable that the cam mechanism has a single master and the first master and the second slave are brought into contact with the single master. This simplifies the shape of the cam member of the cam mechanism, making it easier to manufacture and less expensive.

[0014] Further, the original mechanism of the cam mechanism is composed of a first element that contacts the first follower and a second element that contacts the second follower. And the shape of the second original section may be different. With this configuration, the shapes of the first and second clauses are set to an optimal shape that allows both the first and second followers to move at an ideal moving speed. be able to.

[0015] The cam mechanism is composed of a first clause that contacts the first follower and a second clause that contacts the second follower. The circumferential phase of the peak and the valley of the second original section may be different from the circumferential phase of the peak and the valley of the second original section. Then, at the same position in the circumferential direction of the cam member, when the first follower moves from the peak to the valley of the first original, the second follower is simultaneously moved to the second primary. Since there is no movement from the peak to the valley of the original section, the first member is simultaneously placed at substantially the same position in the circumferential direction of the cam member.
The impact from the follower and the second follower is not applied. Therefore, rattling of the portion holding the cam member can be suppressed, and the life can be extended.

Further, the first and second clauses are defined as follows:
Preferably, the first follower and the second follower have different periods. Then, while the second follower for reciprocating the charging roller cleaning member makes one reciprocation, the first follower for reciprocating the photosensitive member cleaning member can be moved more than that. By setting the cycle of each to an ideal one, it is possible to prevent local abnormal wear of the charging roller and to prevent toner and paper dust from being caught between the photosensitive member and the photosensitive member cleaning member. Sticking can also be prevented.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a configuration of a portion for cleaning a photosensitive member and a charging roller of an image forming apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing an image forming unit of the image forming apparatus. It is.

This image forming apparatus, as shown in FIG.
A drum-shaped photoreceptor 1, a cleaning blade 2 as a photoreceptor cleaning member for cleaning the surface of the photoreceptor 1, a charging roller 3 for charging the photoreceptor 1 in contact with the photoreceptor 1, A charging roller cleaning member 4 for cleaning the surface of the roller 3 is provided. The cleaning blade 2 and the charging roller cleaning member 4 are both provided so as to be able to reciprocate in the axial direction of the charging roller 3 (the direction of arrow A). ing.

In this image forming apparatus, a first rolling contact roller 11 serving as a first follower of the cam mechanism 10 is attached to the cleaning blade 2 via a blade holding member 13 serving as an intermediate member and a support shaft 18. A second roller 12 which is a second follower of the cam mechanism 10 is attached to the charging roller cleaning member 4 by a cleaning holding member 14 which is an intermediate member.
The first rolling contact roller 11 and the second rolling contact roller 12 come into contact with the first rolling contact roller 11 and the second rolling contact roller 12, respectively, and reciprocate in the axial direction (the direction of arrow A). 1 having a cam portion 16 serving as an original section of the cam mechanism 10 to be formed.
The two cam members 15 are provided so as to be rotatable about a cam support shaft 17.

The charging roller 3 is provided with a conductive rubber 7 having low hygroscopicity and a stable resistance value attached to the outer periphery of the metallic core 6 except for both ends.
The surface of the photoreceptor 1 is constantly pressed against the surface of the photoreceptor 1 so that the surface of the photoreceptor 1 is uniformly charged when a high voltage is applied to the cored bar 6.

The charging roller 3 is housed in a unit case 20 as shown in FIG. 2, and the cores 6, 6 at both ends are connected to one end of the swing arms 31, 31, as shown in FIG. Each swing arm 31, 31 is supported by a side plate (not shown) on both sides of the unit case 20 by a pin 32 at a substantially central portion thereof. The swing arms 31, 31 on both sides thereof are pressed by compression coil springs 33, 33, respectively, and are urged to rotate in the direction of arrow B. Therefore, the charging roller 3 is in contact with the surface of the photoconductor 1 at a predetermined pressure suitable for charging by the urging force of each compression coil spring 33.

Between the swing arms 31 on both sides thereof, a cleaning holding member 14 formed of a plate-like member is attached so as to be able to reciprocate in the direction of arrow A. The cleaning holding member 14 has flat holes 14a, 14b formed at both ends thereof, and a long hole 34, along the arrow A direction which is the moving direction of the cleaning holding member 14,
34, and a stepped screw 3 is formed in each of the long holes 34, 34.
5 and 35 are inserted, and each stepped screw 35 is screwed into a screw hole formed on the upper surface of the swing arm 31.

Further, the edges of the support portions 14a and 14b are
Engagement claw 31 formed at one end of swing arms 31
a, 31a. Therefore, the cleaning holding member 14 can reciprocate in the direction of arrow A within the range in which the movement of the stepped screw 35 is allowed in the long hole 34. The cleaning holding member 14 is
As shown in FIG. 1, a second transfer contact is rotatably attached to the left end of the cleaning holding member 14 by being constantly pulled and urged to the left by a spring 22 as a second spring. The roller 12 is the cam surface 1 of the cam portion 16
6a is always pressed.

The charging roller cleaning member 4 is attached to the inner surface of the cleaning holding member 14 with an adhesive such as a double-sided tape. The charging roller cleaning member 4 is, for example, a sponge, and is always in pressure contact with the surface of the charging roller 3 as illustrated. Therefore, when the charging roller 3 rotates, the surface thereof is cleaned by the charging roller cleaning member 4.

On the other hand, as shown in FIG. 4, one end of the blade holding member 13 in the longitudinal direction is fixed to a shaft support portion 13a formed by bending an end portion thereof at a substantially right angle. Bearing hole 31b formed in swing arm 31
Are movably fitted in the direction of arrow A. The first rolling contact roller 1 described with reference to FIG.
1 is attached rotatably.

The blade holding member 13 is pulled and urged in the direction of arrow C by a spring 21 as a first spring, so that the blade holding member 13 is attached to the end of the blade holding member 13 via the support shaft 18. First rolling contact roller 11
Are pressed against the cam surface 16 a of the cam portion 16.
Although not visible in FIG. 4, the support shaft 18 (shown on the right side in FIG. 1) is also fixed to the shaft support portion 13 a on the other end side of the blade holding member 13, and the support shaft 18 is attached to the swing arm 31. Are reciprocally fitted in the bearing holes 31b formed similarly.

As shown in FIG. 2, a charging roller 3 and a photosensitive member 1 are arranged around the photosensitive member 1 in an image forming section of the image forming apparatus.
An exposure device (not shown) that forms an electrostatic latent image by irradiating a laser beam L thereon, a developing device 5 that visualizes the electrostatic latent image to form a toner image, and a developing device 5 that is formed by the developing device 5 A transfer belt 8 for transferring the toner image onto the transfer paper P;
A cleaning device 9 for removing residual toner remaining on the photoreceptor 1 after transferring the toner image to the transfer paper P, and a discharge lamp (not shown) for removing residual charges on the photoreceptor 1 are provided.

In this image forming apparatus, an image forming operation is started when the photosensitive member 1 rotates in the direction of arrow E. That is, when the photoconductor 1 rotates in the direction of arrow E, the photoconductor 1
Is neutralized by static elimination light emitted from the static elimination lamp, and the surface potential of the portion is averaged to a reference potential of 0 to -150 V. Next, the photoconductor 1 is charged by applying a voltage to the charging roller 3, and the surface potential of the photoconductor 1 becomes about -1000V.

The charged surface of the photoreceptor 1 is irradiated with a laser beam L from an exposure device, and the laser beam L is irradiated, so that the surface potential of an image portion becomes 0 to -200V. Therefore, the toner on the developing sleeve 19 of the developing device 5 adheres to the portion where the image is formed. In this manner, the toner image formed on the photoconductor 1 is moved toward the transfer position where the photoconductor 1 and the transfer belt 8 are in contact with each other as the photoconductor 1 rotates in the direction of arrow E. .

On the other hand, transfer paper P is fed from a paper feed unit (not shown), and the transfer paper P is
The leading edge of the transfer paper P is conveyed at a timing coincident with the leading edge of the toner image formed on the photoconductor 1, and the toner image on the photoconductor 1 is transferred to the paper surface. Then, the transfer paper P is conveyed to a fixing unit, where the toner image is melted and fixed by applying heat and pressure, and then discharged to a paper discharge tray or the like. Then, the residual toner remaining on the photoconductor 1 is scraped off by the cleaning blade 2 of the cleaning device 9, and thereafter, the surface of the photoconductor 1 is discharged by a discharge lamp. Thereafter, this image forming process is repeated.

As described with reference to FIG. 1 and the like, the image forming apparatus includes a first rolling contact roller 11 rotatably mounted on a blade holding member 13 for holding the cleaning blade 2 via a support shaft 18. A second roller 12 rotatably mounted on a cleaning holding member 14 for holding the charging roller cleaning member 4 is brought into contact with one cam member 15 and the cam member 15 is rotated to charge the cleaning blade 2 with the cleaning blade 2. Roller cleaning member 4
Are reciprocally movable in the direction of arrow A.

As shown in FIGS. 5 to 7, a detailed shape of the cam member 15 is entirely formed by integral molding of resin. The cam member 15 has a base 15a formed in a substantially disk shape, and the first rolling contact roller 11 and the second rolling contact roller 12 (see FIG. 1) are both formed on a plane formed in the disk shape. A cam portion (original section) 16 having a peak portion a and a valley portion b (see FIG. 7) in contact with each other is formed.

As is apparent from FIG. 7, two peaks a and two valleys b formed on the cam portion 16 are formed at intervals of 180 ° in the circumferential direction. Therefore,
The cleaning blade 2 and the charging roller cleaning member 4 which are reciprocated when the first rolling contact roller 11 and the second rolling contact roller 12 come into contact with the cam surface 16 a of the cam portion 16.
Reciprocates twice while the cam member 15 makes one rotation.

As described above, in this image forming apparatus, the cleaning blade 2 is connected to the cleaning blade 2 via the first rolling contact roller 11 and the second rolling contact roller 12 which are in contact with the cam surface 16a with only one cam member 15. Since the charging roller cleaning member 4 is reciprocated in the axial direction of the charging roller 3 (the direction indicated by the arrow A), the configuration is smaller than when the cleaning blade 2 and the charging roller cleaning member 4 are reciprocated by different mechanisms. Since it can be simplified, the cost can be reduced accordingly.

In this embodiment, the cam surface 16a of the cam member 15 of the first rolling contact roller 11 and the second rolling contact roller 12 is provided.
As shown in FIG. 8, the contact (contact) position with respect to is set to a position that is somewhat apart in the circumferential direction. Therefore, the cam surface 1
The urging force of the springs 21 and 22 (FIG. 1) always acts on the cam surface 16a through the first rolling contact roller 11 and the second rolling contact roller 12. The urging force of the two springs 21 and 22 is applied to the cam surface 16a. Work in two places, some distance apart from each other.
The cam member 1 of the cam shaft 17 as compared with the case where the
Since the bending stress applied to the part supporting 5 is dispersed,
Less backlash.

As shown in FIG. 1, the first rolling contact roller 11 is pressed against the cam surface 16a of the cam member 15 by the biasing force of the spring 21, and the second rolling contact roller 12 is pressed by the biasing force of the spring 22. Therefore, when the cam member 15 is rotating, the first rolling contact roller 11 has a peak a of the cam surface 16a as shown in FIG.
Even when heading toward the valley b from the above, normally, it follows the cam surface 16a and moves in contact with the cam surface 16a.

Therefore, the cleaning blade 2 is rapidly moved in the longitudinal direction of the photoreceptor 1 at a high speed corresponding to a steep gradient from the peak a to the valley b of the cam surface 16a serving as the upper surface of the cam 16. Therefore, it is possible to prevent foreign matters such as toner and paper dust from being fixed when the foreign matters such as toner and paper powder are caught between the photosensitive member 1 and the cleaning blade 2. Similarly, the charging roller cleaning member 4 also moves rapidly in the axial direction of the charging roller 3 at a high speed corresponding to a steep gradient from the peak a to the trough b of the cam surface 16a.

By the way, the charging roller cleaning member 4
Is reciprocated in the axial direction of the charging roller 3 because the toner continuously adheres to the same position between the charging roller 3 and the charging roller cleaning member 4 or foreign matter such as a lump of toner enters. This is because the surface of the charging roller 3 is apt to cause local abnormal wear in response thereto.

For this reason, the reciprocating movement of the charging roller cleaning member 4 does not need to give a shock by abrupt movement like the cleaning blade 2, but it is preferable to make the reciprocating movement slowly. However, when the reciprocating movement of the cleaning blade 2 and the charging roller cleaning member 4 is performed on the cam surface 16a of the common cam section 16 as in this embodiment, the cleaning blade The reciprocating speed of the charging roller cleaning member 2 and that of the charging roller cleaning member 4 are exactly the same.

However, if, for example, the urging force of the spring 22 is made weaker than the urging force of the spring 21 shown in FIG.
7A, the speed of movement of the charging roller cleaning member 4 from the peak portion a to the valley portion b shown in FIG.
The cleaning blade 2 can move at a lower speed than when the cleaning blade 2 moves from the peak a to the valley b of the cam surface 16a. "Biasing force of spring 21-frictional force between photosensitive member and cleaning blade">"Biasing force of spring 22-frictional force between charging roller and charging roller cleaning member"

That is, even if the urging forces of the spring 21 and the spring 22 are made different, the first rolling contact roller 11 is pressed against the cam surface 16a by the spring 21 on the side with the stronger urging force. As shown, the first rolling contact roller 11 is
It moves from the peak part a to the valley part b while being pressed against 6a by the urging force of the spring 21. However, the second rolling contact roller 12 pressed against the cam surface 16a by the spring 22 on the side where the urging force is weaker, while the urging force of the spring 22 moves while moving from the peak portion a to the valley portion b as shown in FIG. There is a portion c that moves in a state of being lifted from the cam surface 16a without being along the cam surface 16a by a small amount.

Therefore, as described above, one cam surface 16
Even in the case of a, the moving speed of the cleaning blade 2 and the moving speed of the charging roller cleaning member 4 (the speed of returning to the left in the drawing) shown in FIG. 1 can be arbitrarily changed. As described above, if the cleaning blade 2 and the charging roller cleaning member 4 are reciprocated together using the cam member 15 having only one cam surface 16a, the shape of the cam member 15 is simplified. Only the production of a mold for resin molding becomes easy, so that the cost is reduced.

FIG. 11 is a plan view similar to FIG. 5 showing an embodiment of a cam member having a different shape, and FIG.
FIG. 13 is a cross-sectional view taken along the line -G, showing the height of the cam surface of the cam member corresponding to the circumferential position of the cam portion. The cam member 45 includes a first cam portion 51 in contact with the first rolling contact roller 11 (FIG. 1) and a second cam portion in contact with the second rolling contact roller 12. 52 is different from the cam member 15 described with reference to FIGS. 5 to 7.

As is apparent from FIG. 13, the cam member 45 has a peak a1 and a valley b1 of the cam surface 51a of the first cam 51 and a peak of the cam surface 52a of the second cam 52. a
The positions (phases) of the cam member 45 in the circumferential direction of the valley b2 are different from those of the cam surface 51a and the cam surface 52a (approximately s).
The height of the (in curve) is also made different as shown in the figure. As described above, if the cam member 45 is formed with the two cam portions of the first cam portion 51 and the second cam portion 52, the shape of the cam surfaces of those cam portions is changed by the cleaning blade 2 and the cleaning blade 2. It is possible to optimize the charging roller cleaning member 4 so that both can be moved at an ideal moving speed.

When two cam portions are formed on the cam member in this manner, as shown in FIG. 13, the circumferential phase of the peak portion a1 and the valley portion b1 of the first cam surface 51a is changed. It is preferable that the phase of the ridge a2 and the valley b2 of the second cam surface 52a in the circumferential direction be different.

By doing so, for example, the first cam surface 5
When the peaks and valleys of the first cam surface 52a and the second cam surface 52a have the same phase in the circumferential direction of the cam member 45, the first
When the rolling contact roller 11 moves from the peak a1 to the valley b1 of the first cam surface 51a, at the same time, the second rolling contact roller 12 moves.
Moves from the peak portion a2 to the valley portion b2, and the impact via the first rolling contact roller 11 and the second rolling contact roller 12 is applied to substantially the same position in the circumferential direction of the cam member 45 at the same time. As a result, a large force for causing the cam member 51 to fall down is applied, but this can be prevented. Therefore, rattling of the portion supporting the cam member 45 can be suppressed, and the life can be extended.

Further, as apparent from FIG. 13, the cam member 45 described with reference to FIGS. 11 to 13 has a cam surface 51a of the first cam portion 51 and a cam surface 52a of the second cam portion 52.
Have different periods. By doing this,
Since the cleaning blade 2 can be moved more than one time while the charging roller cleaning member 4 makes one reciprocation, by setting their periods to ideal ones, the local abnormal wear of the charging roller 3 can be achieved. Can be prevented. In addition, the toner and paper dust
It can also be prevented that it gets caught between the cleaning blade 2 and the fixing blade.

[0048]

As described above, according to the present invention, the charging roller cleaning member and the photosensitive member cleaning member can be reciprocated by the cam mechanism having a relatively simple structure using one cam member. Therefore, it can be manufactured at a low cost because of the simple configuration.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a portion for cleaning a photosensitive member and a charging roller of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating an image forming unit of the image forming apparatus.

FIG. 3 is a perspective view showing the vicinity of a photosensitive member and a charging roller of the image forming apparatus.

FIG. 4 is a perspective view showing one end in a longitudinal direction of a cleaning blade provided in the image forming apparatus together with components adjacent thereto.

FIG. 5 is a plan view showing the cam member of FIG. 1;

FIG. 6 is a sectional view taken along line FF of FIG. 5;

FIG. 7 is a diagram showing the height of the cam surface of the cam member of FIG. 5 corresponding to the circumferential position of the cam portion.

FIG. 8 is a plan view showing a state in which a first rolling contact roller and a second rolling contact roller are in contact with a cam surface at a position which is separated to a certain extent in a circumferential direction.

FIG. 9 is an explanatory view showing a state in which the first rolling contact roller moves along the cam surface by the urging force of a spring when moving from the peak to the valley of the cam surface.

FIG. 10 is an explanatory view showing a state where the second rolling contact roller partially moves above the cam surface due to the urging force of a weak spring when moving from the peak to the valley of the cam surface.

FIG. 11 is a plan view similar to FIG. 5, showing an embodiment of a cam member having a different shape.

FIG. 12 is a sectional view taken along the line GG of FIG. 11;

13 is a diagram showing the height of the cam surface of the cam member of FIG. 11 corresponding to the circumferential position of the cam portion.

[Explanation of symbols]

 1: photoconductor 2: cleaning blade (photoconductor cleaning member) 3: charging roller 4: charging roller cleaning member 6: core metal 11: first rolling contact roller 12: second rolling contact roller 13: blade holding member 14: cleaning Holding members 15, 45: cam member 15a: base 16: cam portion (original section) 16a, 51a, 52a: cam surface 17: cam support shaft 21: spring (first spring) 22: spring (second spring) 51: first cam portion 52: second cam portion

Claims (7)

[Claims] 1. A photosensitive member, a photosensitive member cleaning member for cleaning the surface of the photosensitive member, a charging roller for charging the photosensitive member in contact with the photosensitive member, and a charging member for cleaning the surface of the charging roller An image forming apparatus including a roller cleaning member, wherein the photoconductor cleaning member and the charging roller cleaning member are both provided so as to be reciprocally movable in the axial direction of the charging roller. The first follower is connected to the charging roller cleaning member by the second cam mechanism.
Are attached directly or via an intermediate member, and the first and second followers are brought into contact with the first and second followers respectively to reciprocate in the axial direction. An image forming apparatus, wherein one cam member forming the original section of the cam mechanism is provided. 2. A base portion of the cam member is formed in a substantially disc shape, and a ridge portion respectively contacting the first follower and the second follower on a plane formed in the disc shape. The image according to claim 1, wherein the original section having a valley is formed, and the first follower and the second follower are respectively in contact with different positions in a circumferential direction of the original section. Forming equipment. 3. A first spring for pressing a first follower of the cam mechanism against the base, and a second spring for pressing the second follower against the base. 3. The image forming apparatus according to claim 1, wherein the first spring and the second spring have different urging forces. 4. The cam mechanism has one element, and the first element and the second element are brought into contact with one element. The image forming apparatus according to any one of claims 1 to 3. 5. An element of the cam mechanism includes a first element in contact with the first element and a second element in contact with the second element. 3. The image forming apparatus according to claim 1, wherein the shape of the knot is different from the shape of the second original knot. 6. A cam of the cam mechanism includes a first arm contacting the first slave and a second arm contacting the second slave. 3. The image forming apparatus according to claim 2, wherein a circumferential phase of the peaks and valleys of the knot is different from a circumferential phase of the peaks and valleys of the second original knot. . 7. The method according to claim 5, wherein the first clause and the second clause are formed such that the first follower and the second follower have different periods. 7. The image forming apparatus according to 6.