JP4638611B2 - silencer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a silencer for attenuating vibration generated in a photosensitive drum such as a copying machine, a facsimile machine, an electrophotographic printer such as a laser printer or LED, and a word processor. Specifically, when inserted into the photoconductive drum, the photoconductive drum is not easily deformed, and once inserted, the photoconductive drum does not easily come off from the photoconductive drum, and exhibits sufficient damping and soundproofing effects. Relating to silencers that can.
[0002]
[Prior art]
In a copying machine or an electrophotographic printer using an electrophotographic image forming system, a photosensitive drum is used as a printing medium. This photoconductor drum is obtained by applying a photoconductor to the outer peripheral surface of a cylindrical drum formed of a conductor, and the photoconductor changes physical properties by light including image information sent from an optical writing system. Then, an electrostatic latent image is formed on the surface of the photosensitive drum. The electrostatic latent image formed on the surface of the photosensitive drum is visualized with toner and transferred to a recording medium such as recording paper to form an image.
[0003]
In the image forming apparatus having such a structure, the photosensitive drum used is resonated by receiving vibrations from a motor and a gear that rotationally drives the photosensitive drum. The photosensitive drum was also vibrated due to friction during contact with the cleaning blade.
[0004]
The vibration of the photosensitive drum also causes fluctuations in the rotational speed of the drum. As a result, the writing by the laser beam is disturbed and the image quality is deteriorated. Further, the vibration of the photosensitive drum propagates not only to the drum but also to surrounding members and casings, and an unpleasant high-frequency abnormal noise is generated.
[0005]
For the purpose of overcoming the drawbacks caused by such vibration of the photosensitive drum, conventionally, a silencer has been applied to attenuate the vibration generated in the photosensitive drum by being inserted into the photosensitive drum.
[0006]
As shown in FIG. 4 , the silencer 1 is a cylindrical body having a substantially C-shaped cross section, and the silencer 1 is fitted into the photosensitive drum 2 and comes into contact with the inner peripheral surface of the photosensitive drum 2. The vibration of the photosensitive drum 2 is attenuated and removed, and resonance with surrounding parts in contact with the photosensitive drum 2 is prevented.
[0007]
[Problems to be solved by the invention]
However, the repulsive force of a conventional silencer is extremely strong. When the silencer is inserted into the photosensitive drum, the photosensitive drum is deformed by the repulsive force, resulting in image distortion. The image quality was degraded, such as rubbing.
[0008]
Therefore, in order to prevent such deterioration in image quality, attempts have been made to reduce the curvature of the silencer and weaken the repulsive force, but in this case, the silencer once inserted may fall out of the photosensitive drum, The contact force with respect to the inner peripheral surface of the photosensitive drum becomes too small, and it is impossible to obtain a sufficient vibration damping effect and soundproofing effect.
[0009]
The present invention has been made in view of such circumstances, and when inserted into the photosensitive drum, the photosensitive drum is not easily deformed, and once inserted, the photosensitive drum is not easily detached from the photosensitive drum. In addition, an object of the present invention is to provide a silencer that can exhibit a sufficient damping effect and soundproofing effect.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is a silencer that is inserted into a photosensitive drum and abuts against the inner peripheral surface of the photosensitive drum,
A large number of contact pieces extend from one end side to the other end side having a substantially O-shaped cross section, and the multiple contact pieces are tapered from one end side to the other end side. and has been expanded in such a way that,
Furthermore , the gist of the silencer is characterized in that an insertion rod projecting from the one end side to the other end side is provided on one end side having a substantially O-shaped cross section .
[0011]
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[0017]
DETAILED DESCRIPTION OF THE INVENTION
The silencer of the present invention is applied to image forming apparatuses such as copying machines, facsimile machines, electrophotographic printers such as laser printers and LEDs, and word processors. As shown in FIG. 1, the image forming apparatus 11 uses a photosensitive drum 12 as a print medium. The photoconductor drum 12 is obtained by applying a photoconductor 14 to the outer peripheral surface of a cylindrical drum 13 formed of a conductor. The photoconductor 14 is a light containing image information sent from an optical writing system. As a result, the physical properties are changed, and an electrostatic latent image is formed on the surface of the photosensitive drum 12. The electrostatic latent image formed on the surface of the photosensitive drum 12 is visualized with toner and transferred to a recording paper (recording medium) transported from the paper transport unit 15 to form an image. After the image is transferred, the toner remaining on the surface of the photosensitive drum 12 is scraped off and removed by the cleaning blade 16 of the cleaning device. In FIG. 1, 17 is a developing unit, 18 is a charging unit, 19 is a transfer unit, and 20 is a peeling unit. The silencer 21 is applied to the inner peripheral surface of the photosensitive drum 12 in the image forming apparatus 11 configured as described above.
[0018]
The molding material, molding method, and the like constituting the silencer of the present invention are completely arbitrary, and may be appropriately determined in consideration of the type of image forming apparatus, performance required for the silencer, and the like. In the form shown in FIG.2 and FIG.3, the damping material which mix | blended the inorganic filler with the base polymer shown below was used as a molding material.
[0019]
Base polymer: Polyamide, polyvinyl chloride, polyethylene, chlorinated polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polymethyl methacrylate, polyvinylidene fluoride, polyisoprene, polystyrene, styrene-butadiene-acrylonitrile copolymer (ABS resin) ), Styrene-acrylonitrile copolymer (AS resin), polycarbonate, acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), butadiene rubber (BR), natural rubber (NR), isoprene rubber (IR) One selected from or a mixture thereof.
[0020]
Among them, base polymers having a glass transition point of 40 ° C. or higher, such as styrene-acrylonitrile copolymer (AS resin), styrene-butadiene-acrylonitrile copolymer (ABS resin), polystyrene, and polycarbonate, are required to have heat resistance and strength. It is particularly preferred as a silencer material.
[0021]
When selecting a base polymer, in addition to the type, usage, size, and shape of the silencer, the handleability, formation, availability, temperature performance (heat resistance and cold resistance), weather resistance, price, etc. It is desirable to consider.
[0022]
Inorganic fillers: mica scale pieces, glass pieces, glass fibers, carbon fibers, calcium carbonate, barite, precipitated barium sulfate and the like. The inorganic filler is filled for the purpose of further improving the vibration damping performance. The filling amount of the inorganic filler is preferably 10 to 400 parts by weight with respect to 100 parts by weight of the base polymer. For example, when the filling amount of the inorganic filler is less than 10, even if the inorganic filler is filled, sufficient improvement of the vibration damping performance is not seen. Conversely, even if the filling amount of the inorganic filler exceeds 400, This is because it causes a bad effect that it cannot actually be filled or the mechanical strength of the silencer is lowered.
[0023]
In addition to the above-mentioned components, the damping material used as the silencer molding material includes a benzothiazyl group having a function of improving damping properties by increasing the amount of dipole moment in the base polymer as necessary. , Compounds with benzotriazole groups, compounds with diphenyl acrylate groups, compounds with benzophenone groups, antioxidants, reinforcing agents / reinforcing agents, antistatic agents, flame retardants, lubricants Further, a foaming agent, a colorant, and the like can be blended.
[0024]
Next, the silencer of the present invention according to a preferred embodiment shown in FIGS. The silencer 31 shown in FIG. 2 has a large number of contact pieces 32 extending from one end 31a side having a substantially O-shaped cross section toward the other end 31b side, and the multiple contact pieces 32 have one end. It is expanded so as to be tapered from the portion 31a side toward the other end portion 31b side.
[0025]
The silencer 31 is provided with an insertion rod 33 projecting from the one end 31a side to the other end 31b side on the one end 31a side having a substantially O-shaped cross section. As shown in FIG. 3, the silencer 31 is inserted into the photosensitive drum 34 from the one end 31 a side by grasping the insertion rod 33.
[0026]
At this time, the other end 31 b side of the silencer 31, that is, the other end 31 b side of the contact piece 32 is slid against the inner peripheral surface of the photosensitive drum 34 and resists the force acting in the expanding direction. Therefore, each contact piece 32 gently comes into contact with the inner peripheral surface of the photosensitive drum 34 by the repulsive force, and the vibration generated in the photosensitive drum 34 is attenuated and removed.
[0027]
The taper angle of the contact piece 32 is preferably in the range of 0.5 to 30 °. If the taper angle of the contact piece 32 is smaller than 0.5 °, the silencer 31 once inserted is dropped from the photosensitive drum 34, or the contact force on the inner peripheral surface of the photosensitive drum 34 becomes too small. It becomes impossible to obtain a good vibration control effect and soundproof effect. On the other hand, if the taper angle of the contact piece 32 exceeds 30 °, the contact force of the contact piece 32 on the inner peripheral surface of the photosensitive drum 34 becomes too large, and the photosensitive drum 34 may be deformed.
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[0036]
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[0037]
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[0038]
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[0039]
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[0040]
The silencer shown in FIGS. 2 and 3 is tapered at both ends so that it can be smoothly inserted into the photosensitive drum.
[0041]
【The invention's effect】
The silencer according to claim 1, wherein when being inserted into the photosensitive drum, a large number of contact pieces extending from one end side to the other end side having a substantially O-shaped cross section are formed on the photosensitive member. While sliding on the inner peripheral surface of the drum, it is closed inward against the force acting in the expanding direction, so that each contact piece gently contacts the inner peripheral surface of the photosensitive drum by the repulsive force, and photosensitive The vibration generated in the body drum can be surely attenuated and removed, so that high image quality and low noise can be achieved, and the photoreceptor drum is not easily deformed when it is inserted into the photoreceptor drum, and after being inserted once Does not easily fall off the photosensitive drum .
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[0044]
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[0050]
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[0051]
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[0052]
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of applying the silencer of the present invention on the inner peripheral surface of the photosensitive drum in the image forming apparatus.
FIG. 2 is a perspective view showing an embodiment of the silencer of the present invention.
3 is an enlarged cross-sectional view showing a state where the silencer shown in FIG. 2 is to be inserted into the photosensitive drum .
FIG. 4 is a schematic diagram showing a conventional silencer and an image forming apparatus to which the conventional silencer is applied.
[Explanation of symbols]
32 ... Contact piece 34 ... Photosensitive drum

Claims (1)

A silencer that is inserted into the photosensitive drum and abuts against the inner peripheral surface of the photosensitive drum,
A large number of contact pieces extend from one end side to the other end side having a substantially O-shaped cross section, and the multiple contact pieces are tapered from one end side to the other end side. It has been expanded so that
Furthermore , the silencer characterized by providing the rod for insertion which protrudes from the said one end part side to the other end part side in the one end part side which makes cross-sectional substantially O shape .

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