JPH07319328A - Vibration proofing device for photoreceptor drum - Google Patents

Abstract

PURPOSE:To obtain a vibration proofing device for a photoreceptor drum reducing the vibration of a photoreceptor drum by providing a specified cantilever and constituting the cantilever to absorb vibrational energy applied to the drum. CONSTITUTION:A pair of cantilevers 2 having equivalent characteristic frequency to the photoreceptor drum 1 is fixed on a fixed piece 10 provided perpendicular to a center shaft in the center of the inside of the drum 1. The cantilevers 2 are fixed to be symmetric with reference to the center shaft of the drum 1 on the surface side of the fixed piece 10. Even though the vibrational energy is applied to the drum 1 when the drum 1 is rotated centering around a rotary shaft 3, by such constitution, the cantilever 2 absorbs the vibrational energy (the cantilever 2 is vibrated instead of the drum 1), so that the vibration of the drum 1 is reduced. By reducing the vibration, image quality is improved without making the drum 1 heavier and noise made by the vibration of the drum is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vibration reduction of a photosensitive drum of various electrophotographic recording devices such as printers, copying machines and facsimiles.

[0002]

2. Description of the Related Art Conventionally, as a vibration isolation device for a photosensitive drum, resonance is prevented by changing the natural frequency of the drum itself by inserting a heavy substance such as iron into the drum. There is.

[0003]

In the above-mentioned conventional technique, the weight of the drum is significantly heavy in order to effectively suppress the vibration, and the weight that can be changed is limited.

Further, Japanese Patent Laid-Open No. 4-120582 discloses a vibration isolation device having a disk-shaped dynamic vibration absorber at one end of a rotary shaft of a photosensitive drum. However, since this anti-vibration device is fixed to the outside of the photoconductor drum, a space is required.

The object of the present invention is not to prevent the resonance by changing the weight of the drum, and it is not fixed to the outside of the photosensitive drum, but the vibration applied to the drum is provided inside the drum. An object of the present invention is to provide a photoconductor drum vibration isolator that absorbs a cantilever to reduce drum vibration.

[0006]

In the present invention, the weight is not necessary because the inside of the drum is a cantilever for absorbing vibration, not for increasing the mass of the drum.

It is necessary for the cantilever beam to have a natural frequency equivalent to that of the drum, so that all the vibration applied to the drum is absorbed by the cantilever beam.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 is a sectional view of a photosensitive drum showing an embodiment of the present invention. In the figure, a pair of cantilevers 2 having a natural frequency equivalent to that of the photosensitive drum is fixed to a fixing piece 10 provided in the center of the photosensitive drum 1 perpendicularly to the central axis. The cantilever 2 is provided on the front and back sides of the fixed piece 10 on the photosensitive drum 1.
It is fixed so as to be symmetrical with respect to the central axis of.

Even if vibration energy is applied to the photoconductor drum 1 when the photoconductor drum 1 rotates about the rotation shaft 3, the cantilever 2 absorbs the vibration energy as shown in FIG. 1B. The vibration of the drum is reduced by vibrating the cantilever instead of the body drum.

FIG. 2 is a sectional view showing another embodiment of the present invention. In this embodiment, the cantilever 2 is fixed to a member that closes the openings at both ends of the photosensitive drum 1. Cantilever 2
The position where is fixed may be anywhere inside the photosensitive drum 1. The cantilever 2 is fixed at a position symmetrical with respect to the center or center of the drum in terms of absorption balance of vibration energy, but it is not always necessary to be symmetrical. Moreover, the number of the cantilever 2 may be one.

[0012]

As described above, according to the present invention, a cantilever having a natural frequency equivalent to that of the photosensitive drum is provided inside the drum to reduce the vibration, so that the photosensitive drum is not particularly heavy. It is possible to improve the image quality and reduce the sound generated by the drum vibration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a photosensitive drum according to an exemplary embodiment of the present invention.

FIG. 2 is a sectional view showing a photosensitive drum of another embodiment of the present invention.

[Explanation of symbols]

 1 photoconductor drum 2 cantilever for absorbing vibration 3 rotation axis

Claims (3)

[Claims] 1. An anti-vibration device for a photosensitive drum of an electrophotographic apparatus, wherein a cantilever beam having a natural frequency equivalent to that of the drum is provided inside the photosensitive drum, and the vibration energy applied to the photosensitive drum is cantilevered. An anti-vibration device for a photosensitive drum, characterized in that the beam absorbs it. 2. The photosensitive drum protection member according to claim 1, wherein the cantilever is a pair of cantilever beams fixed to a fixing piece provided at the center of the photosensitive drum. Shaking device. 3. The image stabilizing device for a photosensitive drum, wherein the cantilever is fixed to a member that closes both ends of the photosensitive drum.