JPH03200643A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To eliminate an adverse influence exercised on control of drive by mounting an electricity removing member to remove static electricity from a part contact-electrified due to elevating operation to a placing table elevating in a state to place sheets thereon. CONSTITUTION:A sheet loading tray 3 is mounted in a recessed part 2 of the side part of a duplicator body 1. Guide rails 6 and 7 installed along the vertical direction of the inner wall of the recessed part 2 are engaged with guide grooves 4 and 5, respectively, on both sides of the loading tray 3, and the tray 3 is vertically elevated. An electricity removing brush 9 is mounted to the central part of the tip of the placing tray 3 and brought into contact with a frame 1a of the body 1. Thereby, static electricity generated due to friction between the guide rails 6 and 7 during elevating operation of the tray 3 and friction with a feed roller during sheet feeding operation flows to the frame is of the body 1 through the electricity removing brush 9 to remove electricity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Statement of the Invention] (Field of Industrial Application) The present invention relates to a paper feeding device that is attached to, for example, an electronic copying machine and continuously feeds paper sheets.

(Prior art) This type of paper feeding device uses a stacking tray (mounting table) that can move up and down.
A large number of sheets of paper are stacked on this stacking tray.

The paper on the above stacking tray is moved by the rotation of the paper feed roller.
The sheets are taken out one by one, and the taken out sheets are sent to an image transfer section between the photoreceptor drum and the transfer charger in the electronic copying machine, so that the image on the photoreceptor drum is transferred.

By the way, since the above-mentioned paper is an insulating material, it may cause friction with the vapor guide that occurs during the vertical movement of the stacking tray, friction with the paper feed roller that occurs during paper feeding, or friction that occurs when placing the paper on the stacking tray. Easily charged with static electricity. Furthermore, people who handle paper are already exposed to static electricity.
;) If the person touches the paper or the loading tray, it will become charged. In this way, if static electricity accumulates on the paper or parts that are in contact with the paper, it will cause a build-up between the paper and the surrounding parts. A discharge phenomenon occurs.

(Problems to be Solved by the Invention) Conventionally, the above-mentioned static electricity cannot be removed, and a discharge phenomenon occurs, and noise (commonly known as static electricity noise) is added to the flow of electricity passing through the surrounding area, causing damage to the load. There has been a problem in that the control section that controls the operation of the tray malfunctions.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a sheet feeding device that prevents the occurrence of electrical discharge phenomena and that allows accurate control of the operation of a mounting table.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention provides a paper feeding device that places paper on a mounting table that moves up and down and supplies the paper to a paper receiving section. , contact occurred due to the lifting and lowering movement of the mounting table, H+
The device is characterized in that it includes a static eliminating member that removes static electricity from the parts that are powered.

(Function) By removing static electricity from the parts that are charged by contact with the lifting and lowering movement of the mounting table, the occurrence of a discharge phenomenon is prevented, and the control part is prevented from being electrically adversely affected.

(Example) The present invention will be described below with reference to an example shown in the drawings.

FIG. 2 shows a paper feeding device, which is attached to the side of the main body 1 of the copying machine.

A recess 2 is formed in the side surface of the copying machine main body 1, and a loading tray 3 serving as a loading table is provided west of the recess 2 at I'II'1. This stacking tray 3 is covered by a paper feed cover 8 attached to the side surface of the apparatus main body 1 through an opening/closing opening.

There are guides on both sides of the above-mentioned tray 3 of 4.4° and 5.5°.
Are these guides formed? Guide rails 6.6 and 7.7 provided vertically on the interior surface of the recess 2 are fitted into the holes 4.4 and 5. The loading tray 3 is moved up and down along the guide rails 6.7.7.

Further, a static eliminating brush 9 as a static eliminating member is attached to the central portion of the tip of the placement tray 3, and this static eliminating brush 9 is in contact with the frame 1a of the copying machine main body 1.

The above-mentioned placement tray 3 is constructed as shown in FIG. 1 and the fourth diagram.

That is, as shown exploded in FIG. 4, this loading tray 3 includes an upper plate 31 and a lower plate 32, and a reinforcing member 3 is provided between the upper plate 31 and the lower plate 32.
3 is provided.

Connectors 35 are attached to both ends of the upper lower plate 32 with screws 34, and the reinforcing member 33 and the upper plate 31 are attached to the upper surface of the upper plate 32 with screws 36.

Furthermore, the static elimination brush 9 is attached to the reinforcing member 33 with screws 37, and assembled as shown in FIG.

As shown in FIGS. 5 and 6, the static elimination brush 9 is
It is composed of an aluminum plate 37 bent into a U-shape and a conductive resin sheet 38 held by the aluminum plate 37. The conductive sheet 38
It is shaped like a saw blade.

On the other hand, the placement tray 3 is raised and lowered by a drive system as shown in FIG.

That is, one end of three elevator belts is fixed to the connector 35 of the stacking tray 3 via a metal fitting 49, and a guide roller 401. : The hook is passed around, and the other end is wrapped around the drive shaft 41.

A drive gear 4 is located in the middle of the drive gear shaft 41.
2 is attached.

A gear 43 is meshed with the drive gear 42, and a tray lifting pulley 12 is connected to the gear 43 via a worm gear 44 and a worm 45, and a tray that rotates in forward and reverse directions is connected to the lifting pulley 12 via a belt 47. A motor 48 is connected.

When feeding paper, first, as shown in FIG. 2, the paper feed cover 8 is opened, the paper is set on the stacking tray 3, and then the paper feed cover 8 is closed. When the copy button on the operation section (not shown) of the copying machine main body is turned on from this state, the paper feed roller is rotated and the topmost sheet of paper is taken out one by one, and a photoreceptor (not shown) inside the copying machine main body 1 is turned on. The image is sent to an image transfer section between the drum and the transfer charger, and the image on the photoreceptor drum is transferred.

When a predetermined number of sheets have been fed and the uppermost sheet is separated from the paper feed roller, the tray motor 48 is operated and the belt 4
7. The drive shaft 41 is rotated in the direction of the arrow via the tray lifting pulley 46, the worm 45, the worm gear 44, the gear 43, and the drive gear 42. As a result, the belts 39 and 39 are wound up, the stacking tray 3 is raised, and the top sheet of paper is brought into contact with the paper feed roller again, so that the paper feed becomes r+J function.

Note that when all the sheets are used up, the tray motor 48 is driven in the forwarding direction to lower the loading tray 3 and stop at the lowest end.

By the way, since the above-mentioned paper is a wire-free material, friction with the guide rail 6.7 that occurs during the lifting operation of the stacking tray 3, friction with the paper feed roller that occurs during the paper feeding operation, or friction when the paper is placed Static electricity is generated due to the friction that occurs when placing the paper on the tray 3.

However, as described above, since the loading tray 3 is provided with the static electricity removal brush 38 that contacts the frame 1a of the copying machine main body 1, this static electricity flows to the frame 1a of the copying machine main body 1 via the static electricity removal brush 38. , static electricity is removed.

Therefore, the operation of the stacking tray 3 can be accurately controlled without static electricity being accumulated and causing a discharge phenomenon between the stacking tray 3 and surrounding parts as in the conventional case.

Note that the static eliminating member is not limited to the static eliminating brush 38, but may also be a conductive wire or a plate spring.

[Effects of the Invention] As explained above, according to the present invention, since a static electricity eliminating member is provided that eliminates static electricity accumulated on paper and parts that come into contact with the paper, the discharge phenomenon does not occur as in the conventional case. ,
This has the effect that the loading tray can be accurately driven and controlled.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view showing a stacking tray, FIG. 2 is a perspective view showing a paper feeder, and FIG.
3 is a perspective view showing the drive system of the loading tray, FIG. 4 is an exploded perspective view showing the loading tray, FIG. 5 is a top view showing the static elimination brush, and FIG. 6 is a side view thereof. 3... Loading tray (mounting table), 9... Static elimination brush (
static eliminator +4).

Claims (1)

[Claims] A paper feeding device that places paper on a mounting table that moves up and down and supplies the paper to a paper receiving section is equipped with a static eliminator that removes static electricity from parts that are charged by contact when the mounting table moves up and down. Characteristic paper feeding device.