JP2668612B2 - Sheet transport roller cleaning mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning mechanism for cleaning the surface of a conveying roller for conveying a sheet, and more particularly to a cleaning mechanism for an image forming apparatus such as a copying machine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a thin plate 4 to which a cleaning member 3 such as felt is attached is transported to a pair of transport rollers 1 and 2 for transporting a sheet S in order to clean the surface of the transport roller. It is in contact with the roller 1.

The thin plate 4 is made of polyethylene terephthalate (PET), and one end 4a thereof is fixed to the support 5a with a tape, a screw or the like, a magnet 6 is attached to the other end, and the magnet 6 is attracted to the support 5b. ing.

As another example, as shown in FIG. 4, a cleaning member 8 is attached to one end of a leaf spring 7 and pressed against the conveying roller 1, while the other end 4b is fixed to a support 5a.

[0005]

In the former case, the cleaning member mounting thin plate 4 has one end fixed, but the other end fixed by a magnet, so that the cleaning member mounting thin plate 4 is not used during use as shown by the dotted line in FIG. It may shift. Then, the cleaning member does not come into contact with the transport roller, which makes cleaning impossible.

Therefore, in order to prevent the magnet from slipping and loosening, unevenness is provided in the vicinity of the center of the magnet. However, there are many problems such as the PET thin plate stretching due to heat, and the partial thin plate peeling due to vibration. It occurred and the effect did not rise.

[0007] In the latter case, the surface of the cleaning member which is brought into contact with the conveying roller is small, and the dirt cannot be completely cleaned or the removed dirt is dropped.

In the case of a transport roller that presses one driven roller against the other driven roller, the driven roller is movable with respect to the driving roller, so that the contact pressure of the cleaning member changes due to the movement of the driven roller. As a result, poor cleaning may occur.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a cleaning mechanism for a transport roller which can eliminate a contact failure of a cleaning member with the transport roller and can clean the periphery without soiling.

[0010]

As shown in FIG. 1, a means for solving the problem according to the present invention has a cleaning member 15 for cleaning by contacting a rotatable sheet conveying roller 11, and an elastic member to which the cleaning member 15 is attached. The mounting plate 16 and a holding plate 17 that is superposed on the mounting plate 16 and holds the mounting plate 16 while pressing the mounting plate 16 toward the conveying roller 11 are provided. One end 17a of the holding plate 17 is fixed to the support 18a and the other end is It is movably attached to the support 18b.

The other end of the holding plate 17 is supported by the support 1.
8b is detachable, and the mounting plate 16 can be replaced when the other end of the holding plate is removed.
Is removably attached to

[0012]

In the above means for solving the problems, both ends of the mounting plate 16 are pressed against the holding plate 17 so that they are in contact with the conveying roller 11 in a bent state. At this time, the mounting plate 16
A repulsive force that tends to stretch is generated in the
Since it is regulated by 7, the transport roller 11 is pressed.

During use, the other end of the holding plate 17 may be displaced and the holding plate 17 may be largely bent. At this time, the positions of both ends of the mounting plate 16 are shifted, but since the mounting plate 16 itself is in a bent state, the cleaning member 15 can be pressed with a constant pressure against the transport roller 11 by the repulsive force. .

Therefore, the pressing force of the cleaning member with respect to the conveying roller can be kept constant regardless of the displacement of the holding plate.

Also, by attaching and detaching the other end of the holding plate, the attachment plate can be easily replaced, and since the cleaning member is only attached to the attachment plate, the attachment position of the cleaning member is shifted. Thus, the entire surface of the cleaning member can be used effectively.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, the sheet conveying roller of this embodiment is a circulating automatic document feeder 1 used in a copying machine.
0 is installed and multiple sets are used to convey the original.

The carrying roller 11 is provided with rollers 12 facing each other, one of which is rotationally driven and the other of which is driven. A transport path 13 is arranged before and after the transport rollers 11 and 12, and the sheet is transported through the space. In the drawing, reference numeral 14 denotes a document passage detection sensor.

The carrying rollers 11 and 12 may have their carrying ability deteriorated due to dirt on the roller surface due to paper dust or the like. Therefore, in order to prevent this, a cleaning mechanism for the conveying roller is provided, and as shown in FIG. 1, the cleaning member 15 that contacts the rotatable sheet conveying roller 11 and cleans it.
And an elastic mounting plate 16 on which the cleaning member 15 is mounted.
Is mounted on the mounting plate 16 and the mounting plate 16 is
And a holding plate 17 that holds the holding plate 17 while pressing the holding plate 17 in one direction. One end of the holding plate 17 is fixed to the support 18a, and the other end is movably attached to the support 18b.

The mounting plate 16 is made of a PET flat plate having a thickness of 0.1 to 0.5 mm, the width of which is larger than the width of the transport roller, and the length is long enough to cover the transport roller. To be taken. A cleaning member 1 such as a felt is provided at the center of the mounting plate 16.
5 is stuck with a double-sided tape or the like.

The holding plate 17 is made of the same material as the mounting plate 16 and has a length longer than the mounting plate 16 so as to completely cover the mounting plate 16. Mounting plate 1 on holding plate 17
6 is placed and positioned so that the cleaning member 15 contacts the transport roller 11.

The supports 18a and 18b are arranged in front of and behind the conveying rollers, also serve as a sheet conveying path, and are formed of sheet metal.

Then, when viewed from the portion where the cleaning member 15 is in contact with the transport roller 11, the support 18a on the rotation direction side is provided.
Further, one end 17a of the holding plate 17 is fixed by a tape, a screw or the like. A magnet 19 is attached to the other end of the holding plate 17, and the magnet 19 is attracted to the support 18b.

In the above-mentioned structure, the mounting plate 16 has its both ends abutted and pressed by the holding plate 17 at P1 and P2 in FIG.
It is in contact with the transport roller 11 in a bent state. At this time, a repulsive force is generated on the mounting plate 16 to expand, but since both ends are restricted by the holding plate 17, the conveying roller 11 is pressed.

When the conveying rollers 11 and 12 rotate and the sheet S is conveyed, the paper dust or the like is conveyed to the conveying rollers 11 and 12.
However, the cleaning member 15 pressed against the transport roller 11 cleans the roller surface.

In this way, the transport roller 11 is always cleaned. However, during long-term use, due to the displacement of the magnet 19 of the holding plate 17 and the elongation of PET due to heat,
As shown by the dotted line in FIG. 1, the magnet 19 is displaced and the holding plate 1
7 may be greatly warped.

At this time, both ends of the mounting plate 16 are attached to the holding plate 1.
7 at P1 'and P2', but since the mounting plate 16 itself remains bent, the cleaning member 15 is pressed against the transport roller 11 with a constant pressure by the repulsive force. You can

Therefore, since the repulsive force of the mounting plate to be extended is used, the pressing force of the cleaning member against the conveying roller can be kept constant regardless of the displacement of the holding plate.

Further, as compared with the conventional one in which the cleaning member is supported by using a leaf spring, the contact area of the cleaning member with respect to the conveying roller is increased, and the cleaning can be performed on a wide surface, so that the dirt can be completely removed, and Since the surroundings are completely covered with a holding plate, dirt is not scattered to the outside.

By attaching and detaching the holding plate, the mounting plate can be easily replaced, and the holding plate can be used any number of times. In addition, since the cleaning member is simply attached to the mounting plate, the attachment position of the cleaning member can be shifted, and the entire surface of the cleaning member can be used effectively.

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

Although the present embodiment is applied to the original feeding device of the copying machine, the present invention is not limited to this and may be applied to a device for conveying a sheet other than the copying machine.

Although PET is used as the material for the mounting plate and the holding plate, rubber having elasticity or a thin metal plate may be used. Further, instead of holding the other end of the holding plate with a magnet, a member that can be attached to and detached from the support plate may be used.

[0033]

As is apparent from the above description, according to the present invention, a cleaning member for contacting and cleaning a rotatable sheet conveying roller, an elastic mounting plate on which the cleaning member is mounted, and a mounting plate The holding plate holds the stacked mounting plates while pressing them in the direction of the transport roller, and the cleaning member is pressed against the transport rollers by using the repulsive force of the mounting plate to expand. Regardless of the above, the pressure contact force of the cleaning member with respect to the transport roller can be maintained constant.

Moreover, since the mounting plate is covered by the holding plate, the contact area of the cleaning member with respect to the conveying roller is increased and the contamination is increased as compared with the conventional plate spring which supports the cleaning member. It can be completely removed, and it is possible to prevent scattering of dirt to the outside.

By attaching and detaching the other end of the holding plate, the mounting plate can be easily replaced, and the holding plate can be used any number of times. In addition, since the cleaning member is simply attached to the mounting plate, the attachment position of the cleaning member can be shifted, and the entire surface of the cleaning member can be used effectively.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a cleaning mechanism for a sheet conveying roller according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a document feeding device of a copying machine including a conveyance roller according to this embodiment.

FIG. 3 is a configuration diagram of a conventional sheet transport roller cleaning mechanism.

FIG. 4 is a configuration diagram of another conventional sheet conveying roller cleaning mechanism.

[Explanation of symbols]

 11 Conveyor Roller 15 Cleaning Member 16 Mounting Plate 17 Holding Plate 18a, 18b Support Plate

Claims (3)

(57) [Claims] 1. A cleaning member for contacting and cleaning a rotatable sheet conveying roller, an elastic mounting plate on which the cleaning member is mounted, an elastic mounting plate overlaid on the mounting plate, and pressing the mounting plate toward the conveying roller. A holding plate for holding the sheet, wherein one end of the holding plate is fixed to the support, and the other end is movably attached to the support. 2. The sheet conveying roller cleaning device according to claim 1, wherein the other end of the holding plate is detachable from the support and the mounting plate is replaceable when the other end of the holding plate is removed. mechanism. 3. A cleaning mechanism for a sheet conveying roller, wherein the cleaning member according to claim 1 is detachably attached to a mounting plate.