JPS6123041A - Paper feed device - Google Patents

Abstract

PURPOSE:To sustain the friction force of a paper feed means composed of a friction-feed belt, etc. over a long time period to surely feed papers, by making an adhesive member into close contact with the paper feed means to remove paper powder adhered to the paper feed means. CONSTITUTION:Copying papers stored in a tray 1 are taken out one by one by means of a friction-feed belt 3 which is rotated from a paper stack 2 in the direction of the arrow 13. At this stage a retard roller 4 loosens the papers so that the papers are surely fed one by one. These papers are fed into the next stage such as, for example, a photosensitive drum device or the like by means of a feed roller 5. When copying papers onto which paper powder produced upon cutting is attached are taken out from the paper stack 2 by means of the belt 3, the powder adheres to the belt 3 which therefore gradually lowers its friction coefficient and finally becomes impossible to take out papers. In view of such a trend, an adhesive tape 10 is made into close contact with the belt 13 to remove and transfer the paper powder on the belt 13 with the use of adhesion of the tape onto the surface of the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device, and particularly to a paper feeding device, such as a copying machine, etc., which is equipped with a cleaning device for removing paper dust adhering to a paper ejecting means such as a paper feeding roll. The present invention relates to a paper feeding device.

[Conventional technology]

For example, in order to make a copy using a copying machine, it is necessary to remove and feed sheets one by one from a stack of copy sheets placed in a paper feed tray.

Conventionally, paper feeding devices that feed this paper include a paper feeding device that sucks and feeds the paper using a vacuum device, and a paper feeding device that uses friction such as a rubber roller.

[Problem that the invention seeks to solve]

However, in the case of a paper feeding device that uses a vacuum device, the entire paper feeding device is large-scale and expensive, and it is difficult to miniaturize it.In addition, the paper becomes thinner and two sheets of paper are sucked up at the same time. There are some problems such as: Also,
Paper feeding devices that use the friction of rubber rollers can be made relatively inexpensively, but if paper is continuously fed,
Paper dust that was on the paper adheres to the surface of the rubber roller,
When this amount of adhesion increases, the friction coefficient of the rubber roller decreases, resulting in a problem that paper can no longer be fed. In particular, when using paper of medium quality paper or lower, which has a large amount of paper dust, more paper dust will adhere to it.
The supply capacity of the rubber roller decreases quickly. Furthermore, if you continue to operate the copying machine with paper dust on the rubber rollers, paper dust may adhere to the photosensitive drum surface and stain the copies, even if it is not impossible to feed paper. In the worst case, there is a problem in that the surface of the photosensitive drum is damaged.

The present invention has been made to solve these problems, and an object of the present invention is to provide a paper feeding device that can reliably feed copy paper and is not adversely affected by paper dust.

[Means for Solving the Problems and Their Effects] In order to achieve this objective, in this invention, a sheet feeding means using friction such as a rubber roll feeds sheets one by one from a stack of sheets placed on a sheet feeding tray. A paper feeding device for a copying machine that takes out paper is characterized in that an adhesive body is provided in close contact with a paper feeding means such as a rubber roll to remove paper powder adhering to the paper feeding means.

As a result, even if the copying machine is operated continuously, for example, the paper feeding capacity of the paper feeding device does not decrease, and paper can be fed reliably.

[Embodiment] Hereinafter, an example in which an embodiment of the present invention is used in a copying machine will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a paper feed tray, which accommodates a stack 2 of copy sheets therein, and rises in the direction of arrow 12 as the sheets are used.

Reference numeral 3 denotes a paper feeding means using friction, which in this embodiment is a friction feed belt.

It is rotationally driven by two rollers driven by a feed motor 11. This friction feed machine 3 uses the friction to take out the topmost sheet of paper from the paper stack 2, and feeds it to the next stage of the copying machine, such as a photosensitive drum, via a feed roller 5. 10 is an adhesive tape wrapped around the supply roller 9;
and a winding roller ruff driven by a stepping motor 8. Note that 4 is a retard roller, which rotates slightly in the opposite direction to sort the sheets.

The operation of the paper feeding device having such a configuration is as follows.

Copy sheets stored in a tray 1 are taken out one by one from a sheet stack 2 by a friction feed belt 3 rotating in the direction of arrow 13. At this time, the paper is separated by the retard roller 4, and one sheet of paper is reliably fed. This paper is sent to the next stage, such as a photosensitive drum device, by a delivery roller 5.

The copy paper stored in the paper sheet stack 2 has paper dust attached thereto that is generated during cutting. This paper dust adheres to the friction feed belt 3 as it removes paper from the stack 2.

When paper dust adheres to the friction feed belt 3, its coefficient of friction gradually decreases until it becomes impossible to pull out the paper. Therefore, this friction
An adhesive tape 10 is brought into close contact with the feed belt 3, and paper dust on the friction feed belt is removed by its viscosity and transferred to the adhesive tape.

At this time, the tape 10 may be rotated together with the friction feed belt 3, but the friction feed belt 3 may be stopped for a certain period of time during operation, and when a certain amount of paper dust adheres to the adhesive tape, , a stepping motor for tape winding may be driven to wind up a predetermined length of adhesive tape.

If the adhesive tape is stopped for a predetermined period of time, the adhesive tape can be used effectively, but if the adhesive tape is rotated at the same time, the amount of paper dust transferred to the adhesive tape is small, resulting in a poor utilization rate of the adhesive tape. In this case, the adhesive tape may have an endless configuration and be used continuously for a predetermined period of time until the performance of the adhesive tape deteriorates.

Moreover, the same effect can be obtained by using a roll made of a member having friction, such as rubber, as the paper feeding means in place of the above-described friction feed belt.

Further, instead of the adhesive tape 10, an adhesive body such as a roll having a viscous surface may be used, and this adhesive body may be brought into close contact with the surface of a paper feeding means such as a friction feed belt.

〔Effect of the invention〕

As mentioned above. According to this invention, friction
The adhesive material is brought into close contact with the paper feeding means such as a feed belt, and the paper powder adhering to the paper feeding means is removed.
The frictional force of the paper feeding means can be maintained over a long period of time, and paper can be reliably fed. In addition, since paper dust does not adhere to the photosensitive drum, for example, copied images are less likely to get dirty.
It will not damage the photosensitive drum.

[Brief explanation of drawings]

The attached drawings are diagrams showing an embodiment of the present invention. 1-Paper feed tray, 2-Paper stack, 3-Friction
Feed belt, 6.7-Roller, 8-Stepping motor, 10-Adhesive tape, Patent applicant Fuji Xerox Co., Ltd. agent Patent attorney Akira Yamatani.

Claims (1)

[Claims] In a paper feed device of a copying machine that takes out sheets one by one from a stack of paper sheets placed on a paper feed tray by a paper feed means,
A paper feeding device characterized in that an adhesive body is provided in close contact with the surface of the paper feeding means to remove dust such as paper powder adhering to the paper feeding means.