JPH085486Y2 - Image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an image forming apparatus.

<Prior Art> In a conventional image forming apparatus, as shown in FIG. 5, a cleaning blade 2 rubbed against the surface of a photoconductor 1 rotatably and forwardly and reversely fitted and fixed to the end of the photoconductor 1 by external fitting. The photoconductor driving first gear 3 and the photoconductor driving second gear 4 arranged on the image forming apparatus main body side so as to mesh with the first gear 3 are provided, and the photoconductor driving gears 3, 4 are provided. Used spur gears.

<Problems to be Solved by the Invention> In the above prior art, when the cleaning blade 2 and the photosensitive member 1 are not in conformity with each other at the time of initial setting of the photosensitive member 1, the photosensitive member 1 is cleaned by the cleaning blade 2. If the cleaning blade 2 is rotated in the normal direction, the cleaning blade 2 may be reversed, and the cleaning blade 2 may rub the surface of the photoconductor 1 to remove the residual toner on the photoconductor 1.

Therefore, conventionally, when the photoconductor 1 is inserted, the photoconductor 1 is manually rotated in the reverse direction to prevent the cleaning blade 2 from being inverted.

However, it is complicated to manually operate the photoconductor 1 by the opposite hand, and there is a possibility of forgetting.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an image forming apparatus in which a photosensitive member is automatically rotated in a reverse direction when the photosensitive member is inserted, and the cleaning blade is not inverted even when the photosensitive member is normally rotated in initial setting of the photosensitive member. With the goal.

<Means for Solving the Problems> The means for solving the problems according to the present invention is, as shown in FIGS. 1 to 3, a cleaning blade 21 for rubbing against the surface of the photoconductor 12 rotatably mounted in the forward and reverse directions. A first gear 22 for driving a photoconductor that is externally fitted and fixed to an end of the photoconductor 12, and a second gear for driving a photoconductor that is arranged on the image forming apparatus main body side so as to mesh with the first gear 22. A gear 23, helical gears are used for the first gear 22 and the second gear 23, and the first gear 22
Of the first gear 22 and the second gear 23 are
Is engaged while rotating the photoconductor 12 in the direction opposite to the normal rotation during operation in order to prevent the cleaning blade 21 from reversing when the photoconductor 12 is axially inserted into the main body of the image forming apparatus. Is.

<Operation> In the above problem solving means, when the photoconductor 12 is inserted in the axial direction and the first gear 22 and the second gear 23 are meshed with each other, the photoconductor 12 is rotated in the direction opposite to the forward rotation during operation. Rotate. That is, the photoconductor 12 rotates in the opposite direction to the direction in which the cleaning blade 21 cleans the surface of the photoconductor 12. As a result, toner or the like wraps around the cleaning blade 21, and the photoreceptor 12 and the cleaning blade 21 can be appropriately lubricated.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view of an essential part of an image forming apparatus showing an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are views showing a rotation direction of a photosensitive member during operation, and FIG. 3 (a) ( b) FIG. 4 is a diagram showing the rotation direction when the photoconductor is inserted, and FIG. 4 is an overall configuration diagram of the image forming apparatus.

As shown in FIG. 4, the image forming apparatus according to the present embodiment has an optical system including a light source 10 and a lens 11 for exposing an original on an original table, and an electrostatic latent image is formed on the surface by reflected light from the optical system. Photoconductor 12 and a developing device for visualizing an electrostatic latent image on the photoconductor 12
13, a charging device 14 for charging the surface of the photoconductor 12 with toner supplied from the developing device 13, and a toner image on the photoconductor 12 visualized on a transfer paper from a paper feeding device 15 is transferred. A transfer device 16, a cleaning device 17 for removing the toner remaining on the photoconductor 12, a fixing device 18 for fixing the transferred toner image on the transfer paper, and a conveying device 19 for conveying the transfer paper to the fixing device 18. And a paper discharge device 20 for discharging the transfer paper fixed by the fixing device 18.

Then, as shown in FIGS. 1 to 3, a cleaning blade 21 which rubs against the surface of the photoconductor 12 rotatably mounted in the forward and reverse directions, and a photoconductor drive which is externally fitted and fixed to the end of the photoconductor 12. First gear 22 and a second gear 23 arranged on the image forming apparatus main body side so as to mesh with the first gear 22, and the first gear 22 and the second drive gear 23 are helical gears. Is used, and its twist angle direction is set so as to engage while rotating in a direction opposite to the forward rotation when the photosensitive body 12 is operating when the photosensitive body 12 is inserted.

The cleaning blade 21 is made of urethane rubber and is held by a holder 24 as shown in FIG.

The first gear 22 is a large helical gear,
The second gear 23 is a small helical gear. The twist angle direction of the first gear 22 is left because the forward rotation direction of the photoconductor 12 during operation is right as shown in FIG.

In the above configuration, when the photoconductor 12 is inserted, helical gears are used for the gears 22 and 23 for driving the photoconductor, and the twist angle direction thereof is the forward rotation when the photoconductor 12 is operating when the photoconductor 12 is inserted. Since it is set to mesh while rotating in the opposite direction,
While the photoconductor 12 is inserted to its set position, the first gear 22 and the second gear 23 mesh with each other, and the photoconductor 12 is a cleaning blade.
21 rotates in the opposite direction to the cleaning of the surface of the photoconductor 12.

As described above, when the photoconductor 12 is rotated in the reverse direction when the photoconductor 12 is inserted, the toner or the powder (product name: Kainer) wraps around the tip corner portion (ridge green part) of the cleaning blade 21 to clean the photoconductor 12 and the cleaning. The blade 21 and the cleaning blade 12 can be prevented from being reversed by giving an appropriate lubrication effect to the blade 21.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, in the above embodiment, the gear 2 for driving the photoconductor is used.
A bevel gear may be used for 2,23.

<Effect of the Invention> As is apparent from the above description, according to the present invention, when the photoconductor is inserted, the first gear and the second gear mesh with each other, so that the photoconductor rotates in the direction opposite to the normal rotation during operation. Toner or the like wraps around the cleaning blade to give a proper lubrication effect to the photoconductor and the cleaning blade, and prevents the cleaning blade from reversing when the photoconductor and the cleaning blade are not familiar with each other, especially at the time of initial setting of the photoconductor. be able to. Moreover, there is an excellent effect that the above-described operation can be achieved by a simple structure in which the gear for driving the photoconductor is replaced with a helical gear from the conventional spur gear.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an image forming apparatus showing an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are views showing a rotation direction of a photosensitive member during operation, and FIG. 3 (a) ( FIG. 4B is a diagram showing a rotation direction when the photoconductor is inserted, FIG. 4 is an overall configuration diagram of the image forming apparatus, and FIG.
FIG. 1 is a perspective view of a main part of a conventional image forming apparatus. 12: Photoconductor, 21: Cleaning blade, 22: First gear, 2
3: Second gear.

Claims (1)

[Scope of utility model registration request] 1. A cleaning blade rotatably and rotatably provided on a surface of a photoconductor, a first gear for driving the photoconductor externally fitted and fixed to an end of the photoconductor, and the first gear. A second gear for driving the photoconductor, which is arranged on the image forming apparatus main body side so as to mesh with the gear, and the first gear and the second gear are helical gears, and the twist angle of the first gear is used. The direction is set in the direction opposite to the direction of normal rotation when the photoconductor is operated, and the first gear and the second gear are the reverse of the cleaning blade when the photoconductor is axially inserted into the image forming apparatus main body. In order to prevent the above-mentioned problem, the image forming apparatus is characterized in that the photoconductor is engaged while being rotated in the direction opposite to the normal rotation during operation.