JPS5839468Y2 - Denshi Fukushi Yakinohakurisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a peeling device for an electronic copying machine that peels off transferred copy paper that has been electrostatically attracted to the photosensitive surface of a photosensitive member.

Conventional devices of this type include, for example, a peeling lever single type and an air blowing type.

However, in the above-mentioned method, it is difficult to determine the timing of peeling, and the mechanism is complicated, and the copy paper is often damaged.The method described below requires a considerably large blowing force, generates high noise, and may disturb the image surface.

In addition, there are various other peeling devices, but each of them has disadvantages such as high noise, easy image distortion during peeling, mechanical complexity, and troublesome maintenance and inspection.

The present invention was developed based on the above circumstances, and its purpose is to eliminate all of the above-mentioned disadvantages by using magnets, and to provide a peeling device for an electronic copying machine that can reliably peel. .

An embodiment of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes the main body of an electronic copying machine, and on the top surface of this main body 1 is a document mounting table 3 that supports a document 2 and can reciprocate in the horizontal direction.
is provided.

Furthermore, an optical system 4 for scanning the original surface of the original 2 is provided in the main body 1, and a photoreceptor that rotates in a predetermined direction at the same peripheral speed as the moving speed of the original placing table 3 is located at this projection image formation position. However, a photosensitive drum 5 is provided.

Further, various devices are arranged radially along the photosensitive surface 5a of the photosensitive drum 5, that is, a charging device 6 for charging the photosensitive surface 5a of the photosensitive drum 5 is provided between the optical system 4 and the photosensitive drum 5. ing.

An image forming position by the optical system 4 is located on the side of the charging device 6 in the rotational direction of the photosensitive drum 5, and the charged photosensitive surface 5a is exposed to light to form an electrostatic latent image on the surface of the document.

On the rotational side of this image forming position, a magnetic brush is formed with developer powder made by mixing carrier and toner in an appropriate ratio, and a magnetic roller is used to coat the photosensitive surface and visualize the electrostatic image. a developing device 7 having: a transfer charging device 9 that charges the copy paper 8 and transfers the developed image onto the copy paper 8;
A peeling section 11a of a peeling device 10, which will be described later, a static eliminating lamp 12 for canceling the charge remaining on the photosensitive surface 5a after transfer, and a cleaning device 13 for removing residual toner are provided in this order.

Further, a paper feeding device 14 is provided at the inner bottom of the main body 1 to store a large number of copy papers 8 and feed them one by one.・・・・・・
and a conveyance bell) 15b along a conveyance path 15.

The conveyance path 15 guides the copy paper 8 between the photosensitive drum 5 and the transfer charging device 9, and also leads the copy paper 8 to the main body 1 via the peeling section 11a.
It is designed to lead to a tray 16 provided outside.

On the other hand, the peeling device 10 is constructed as shown in FIG. 2, and consists of an alignment part 11b and a peeling part 11a (however, only one end is shown).

The alignment section 11b is provided on the photosensitive drum 5,
That is, small magnet bodies 17, 17 are embedded with their surfaces exposed at both ends of the position where the image of the document surface is formed.

The magnetic bodies 17, 17 have peelable pieces 18, 18 made of a magnetized material such as stainless steel material, for example.
The free ends 18a, 18a of the two are magnetically attracted to each other.

Peeling piece 18.18 is an extremely thin plate with a thickness of Q, about 1 m/m,
It is a small piece with a width of about 3 to 5 m/m and a length of about 15 to 20 m/m, and the other end portions 18 b and 1'8 b are fixed to the photosensitive drum 5 with an adhesive or the like.

On the other hand, the peeling section 11 a is composed of a peeling roller 19 and guide plates 20 and 20 serving as guide members, and the peeling roller 19 is rotatably provided with a narrow gap from the circumferential surface of the photosensitive drum 5 . ing.

Peeling magnets 19a, 19a having the same polarity as the small magnet body 18 and having a stronger magnetic force than the small magnet body 18 are fitted to both ends of the roller 19.

The positions of these peeling magnets 19a, 19a change as the photosensitive drum 5 rotates.
This is also the position where the peeling pieces 18 and 18 face each other.

In addition, the guide plate 20.20 is provided between the upper and lower sides of the conveyance path 15, and conveys the copy paper 8 to be peeled off.
It is now possible to guide you to 5b.

On the other hand, the conveyance path 12 between the peeling section 11 a and the tray ] 6
A charge removing charging device 21 for removing charges of toner 1 to toner on the developing surface of the copy paper 8 and a fixing device 22 for heating and fixing the toner are disposed.

Next, the operation of the above embodiment will be explained.

When the document 2 is placed face down on the document tray 3 and a copy button (not shown) is pressed, the document tray 3, the optical system 4, the photosensitive drum 5, the charging device 6, and the developing device 7 operate in conjunction with each other. Inverted images are sequentially formed on the photosensitive surface 5a starting from the alignment portion 11b.

On the other hand, the copy paper 8 is supplied from the paper feeder 14 through the conveyance path 15, and its leading edge is aligned with the alignment section 11b at the appropriate timing as shown in FIG. 3A, and as shown in FIG. 3B. They are electrostatically attracted to the photosensitive surface 5a one after another.

Note that since the peeling pieces 18, 18 are extremely thin, they have no effect on the electrostatic attraction of the copy paper 8.

The inverted image is then transferred onto the copy paper 8 by the action of the transfer charging device 9.

When the leading edge of this copy paper 8 faces the peeling roller 19,
Free end 18 of release strip 18.18 as shown in FIG.
a receives a stronger magnetic force from the peeling magnets 19 a , 19 a than the small magnet bodies 17 , 17 , and separates from the small magnet bodies 17 .

Therefore, the leading edge of the copy paper 8 is peeled off from the photosensitive surface 5a and transferred to the guide plate via the magnetic roller 19) 20.20
You will be guided in between.

Further, as shown in the third diagram, as the photosensitive drum 5 rotates, the copy paper 8 is sequentially peeled off, and is transferred to a charging device 21 for charge removal by a conveyance path 12. The sheets are sequentially guided to the fixing device 22 to obtain a copy image and are discharged onto the tray 16.

On the other hand, the peeling pieces 18 and 18 are peeling magnets H9a and 19a.
The end portion 18a is magnetically attracted to the small magnet piece 17.17 again, and the static elimination lamp 1
2. The photosensitive surface 5a is opposed to the cleaning device 13 to remove the electric charge and wipe away the residual toner, thereby completing all the copying steps.

In this way, in the above embodiment, the peeling magnet) 19a
, 19a are rotatably fitted to the peeling roller 19,
The peeling roller 19 can transport and guide the peeled copy paper 8.

Further, although the surface of the small magnet bodies 17, 17 is exposed, it is of course possible to completely embed them within the photosensitive drum 5 as long as the free ends 18a, 18a of the peelable pieces 18.18 can be magnetically attracted. .

Furthermore, although the peeling magnets 19a and 19a are fitted to the peeling roller 19, a single peeling magnet screw l-19a' may be used as shown in FIG.

However, at this time, it is more convenient for the lower guide plate 20' to surround the magnet 19a' for guiding the conveyance of the copy paper 8.

As explained above, according to the present invention, in an electronic copying machine equipped with a developing device having a magnetic roller, a small magnetic body is embedded in a part of the peripheral wall of a photoreceptor, and one end of a peelable piece made of a magnetized material is fixed. However, the free end of this peeling piece was magnetically attracted to the magnetic body, a peeling magnet with a stronger magnetic force than the magnetic body was provided near the photoreceptor, and a guide was provided along this peeling magnet.
The peeling magnet can peel off the copy paper that is electrostatically attracted to the photosensitive surface from the magnet body together with the free end of the peeling piece.

Therefore, the image on the copy paper is not disturbed at all when it is peeled off, and the copy paper can be reliably peeled off from the photoreceptor.

In particular, since the peeling piece is configured with the front and rear ends in the direction of movement of the photoreceptor as free ends, the copy paper can be peeled off reliably.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional front view of an electronic copying machine showing an embodiment of the present invention, FIG. 2 is an exploded perspective view with a part cut away of a peeling device, and FIGS. FIG. 4 is a schematic front view of a peeling device showing another embodiment of the present invention. 5...Photoreceptor (photosensitive drum), 5a...
・Photosensitive surface, 8... Copy paper, 17... Magnetic body, 18a... End portion, 18...
... Peeling piece, 19 a ... Peeling magnet, 20 ... Guide body.

Claims (1)

[Scope of utility model registration request] In an electronic copying machine in which copy paper is electrostatically attracted to the photosensitive surface of a movable photosensitive member and a visible image previously formed on the photosensitive surface is transferred, a copying paper is embedded in a part of the peripheral wall of the photosensitive member. a peeling piece made of a magnetized material interposed between the photosensitive surface and the copy paper, the free end of which is magnetically attracted to the magnetic small body and the other end fixed to the photoreceptor; A peeling magnet is provided near the photoreceptor and attracts the free end of the peelable piece by overcoming the magnetic force of the small magnet body to peel the copy paper on which a visible image has been obtained from the photosensitive surface. A peeling device for an electronic copying machine, characterized in that the peeling device comprises a guide member provided to guide peeled copy paper, and the free end of the peeling piece is positioned on the front side in the moving direction of the photoreceptor. .