JPH04151174A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To improve the operability by feeding a fixed form reversely and guiding it in a 1st guide member through a guide member for reverse-side recording, transferring a toner image to the reverse surface, and discharging the form to a discharge opening through a 3rd guide member when both-side recording is performed. CONSTITUTION:For the both-side recording, the fixed form 4 has its head end part guided in a defective form tray 14 temporarily through a 4th guide member 13. Then the form is sent reversely and guided in the 1st guide member 7 through the guide member 10 for reverse-side recording, the toner image on a photosensitive drum 1 is transferred to the reverse surface at a transfer part 5 and fixed at a fixation part 6, and the form is discharged to the discharge opening 9 through the 3rd guide member 12. The form is therefore not exposed through the discharge opening 9 halfway in the recording. Consequently, the operability of the form at the time of the both-side recording is improved.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to the structure of an electrophotographic device capable of double-sided recording such as xerography and racer printers, and aims to improve the operability of paper in the case of double-sided recording. a latent image forming section that forms a latent image on the photosensitive drum; a developing section that uses toner to develop the latent image formed by the latent image forming section; a transfer section that transfers the toner image on the photosensitive drum to the paper; a fixing section that fixes the toner image transferred onto the paper; a third guide member that guides the fixed paper to an ejection port; A fourth guide member that guides paper to a defective paper tray, a switching mechanism provided at a branch point between the third guide member and the fourth guide member that guides paper to a desired guide member, and a fixing unit and a switching mechanism. The second between the mechanism
a backside recording guide member whose one end joins the first guide member and whose other end joins the first guide member; It consists of an impeller that rotates in the direction of introducing the toner into the photosensitive drum and a cleaning section that removes residual toner on the photosensitive drum after transfer. In the case of single-sided recording, the fused paper is ejected through the third guide member. In the case of double-sided recording, the leading edge of the fused paper is temporarily introduced into the defective paper tray through the fourth guide member, and then the paper is reversely fed and the back side recording guide member is fed out and the paper is transferred to the first paper tray. The toner image is introduced into the guide member, the toner image on the photosensitive drum is transferred to the back side by the transfer section, and after being fixed by the fixing section, it is discharged to the discharge port via the third guide member.

Sensors are arranged on the first, second, and back side recording guide members to detect paper jams and store them in the defective paper tray.

[Industrial application field]

The present invention relates to the structure of an electrophotographic apparatus capable of double-sided recording, such as a heptographic printer.

In recent years, electrophotographic devices that can record on plain paper have become popular.

Some of these electrophotographic apparatuses are capable of recording on both sides of a sheet of paper, and countermeasures are required since it is possible to mishandle the sheet when recording on both sides.

[Conventional technology]

As shown in the structural diagram of FIG. 2, an electrophotographic apparatus capable of double-sided recording includes a photosensitive drum 1 made of an organic photoreceptor or an amorphous silicon photoreceptor and provided to rotate in the direction of the arrow; A charger that uniformly charges the entire surface of the drum 1 in a dark place by corona discharge, a rotating mirror for deflecting laser light from a semiconductor laser, and
A latent image forming section 100 consists of a mirror, etc. that reflects the laser light and makes it incident on the photosensitive drum I to form an electrostatic latent image, and a latent image forming section 100 that forms a latent image on the photosensitive drum I, and a two-component system consisting of toner and carrier. The main components include a storage tank for storing developer, a developing roller composed of a magnetic roller and a sleeve made of a non-magnetic material, and a stirring roller for stirring toner and carrier. The developing section 200 is equipped with a corona discharger and a developing section 200 that develops a latent image using toner, and charges the sheet 4 conveyed from the hopper 3 through the first guide member 7 to an opposite polarity to form a toner image on the photosensitive drum. It consists of a transfer section 5 that transfers the image, a heat roller and a pressure roller, and a fixing section 6 that fixes the toner image on the paper 4 by pinching the paper 4 between them. a second guide member 8 between the fixing unit 6 and the discharge port 9;
A guide member IO for back side recording which joins one end to the first guide member 7 and the other end to the first guide member 7, and a plurality of guide members 8 provided at the junction of the guide member IO for back side recording and the second guide member 8. An impeller 11 with blades arranged radially and constantly rotating in the direction of introducing the paper 4 into the back side recording guide member 10, a static eliminator that optically removes the charges on the photosensitive drum 1, and a photosensitive drum 1.
The cleaning section 400 includes a rotating brush for removing residual toner on the cleaning section 400.

In the case of single-sided recording, the fixed paper 4 is discharged to the discharge port 9 through the second guide member 8 .

In the case of double-sided recording, the fixed paper 4 is first fed through the second guide member 8 until the leading end protrudes from the discharge port 9, and then reversed and recorded on the back side by the impeller 114). The liquid is introduced into the first guide member 7 via the guide member 10 for use.

That is, by passing through such a route, the paper 4 is reversed,
By passing through the transfer section 5 and fixing section 6 again, the toner image on the photosensitive drum 1 can be transferred to the back surface.

Then, the paper 4 recorded on both sides is moved to the second guide member 8.
It is discharged to the discharge port 9 through the outlet.

[Problem to be solved by the invention]

As described above, recording is performed on one or both sides of paper (two sheets) using an electrophotographic apparatus.

During double-sided recording, the leading edge of the paper first protrudes from the outlet.

Then, the operator misunderstood that recording had ended and attempted to take out the bow by hand, causing a jam or skew.

The present invention aims to improve the operability of paper in the case of double-sided recording.

[Means to solve the problem]

In the present invention, the configuration diagram shown in FIG. a developing section 200 that develops a latent image using toner, a transfer section 5 that transfers the toner image on the photosensitive tram 1 onto the paper 4 fed out from the hopper 3 and conveyed through the first guide member 7; a fixing unit 6 that fixes the toner image transferred to the image, and a third guide member 1 that guides the fixed paper 4 to the discharge port 9.
2, a fourth guide member 13 that guides the fixed paper 4 to the defective paper tray I4, and a fourth guide member 13 that guides the paper 4 to the desired paper tray. A switching mechanism 15 that guides the guide member, and a back side recording device whose one end joins the second guide member 8 between the fixing section 6 and the switching mechanism 15 and whose other end joins the first guide member 7. a guide member 10, an impeller 11 that is provided at the junction of the back side recording guide member IO and the second guide member 8 and rotates in a direction to introduce the paper 4 into the back side recording guide member IO;
A cleaning section 400 removes residual toner on the photosensitive drum 1 after transfer, and in the case of single-sided recording, the fixed paper 4 is discharged to the discharge port 9 via the third guide member 12, and double-sided recording is performed. In this case, the fixed paper 4 is transferred to the fourth
After the leading edge is temporarily introduced into the defective paper tray 14 through the guide member 13 of
The toner image on the photosensitive tram L is transferred to the back side by the transfer unit 5, and after being fixed by the fixing unit 6, it is discharged to the discharge port 9 through the third guide member 12. It was designed to do so.

And the first, second and back side recording guide members 7.8.1
A sensor 16 is disposed in the tray 14 to detect jamming of paper 4 and store defective paper in the defective paper tray 14.

[Effect]

In the case of double-sided recording, the leading end of the fixed paper 4 is once introduced into the defective paper tray 14 through the fourth guide member.

After that, the first
The toner image on the photosensitive drum is transferred to the back surface by a transfer section, fixed by a fixing section, and then discharged to a discharge port through a third guide member.

Therefore, the paper is not exposed from the ejection port during recording.

Also, the paper is connected to the first, second and back side recording guide members 7.8.
10, a jam is detected by a sensor 16, and the defective paper is stored in a defective paper tray.

〔Example〕

FIG. 1 shows an embodiment of the present invention.

Identical parts are designated by the same reference numerals throughout the figures.

In the present invention, as shown in the configuration diagram of FIG. a developing section 200 that develops the latent image using toner, and a transfer section 5 that transfers the toner image on the photosensitive drum 1 onto the paper 4 fed out from the hopper 3 and conveyed through the first guide member 7.
and a fixing unit 6 that fixes the toner image transferred onto the paper 4.
Further, a third guide member 12 guides the fixed paper 4 to the discharge port 9, and a third guide member 12 guides the fixed paper 4 to the defective paper tray 14 provided directly below the discharge port 9. 4 guide member 13, and a switching valve-shaped switching mechanism 15 provided at the branch point between the third guide member 12 and the fourth guide member 13 and guiding the paper 4 to the third or fourth desired guide member. The second guide member 8 that connects the fixing section 6 and the switching mechanism 15 has one end joined to the first guide member 7, and the other end joined to the first guide member 7, as in the prior art. A guide member 10 for back side recording is provided, and an impeller 11 is provided at the confluence point of the guide member 10 for back side recording and the second guide member 8, which rotates in a direction to introduce the paper 4 into the guide member 10 for back side recording. , and a cleaning section 400 for removing residual toner on the photosensitive drum 1 after transfer.

In the case of single-sided recording, the switching mechanism 15
Select the guide member (2) and eject the fixed paper 4 to the ejection port 9.

On the other hand, in the case of double-sided recording, the switching mechanism 15
The leading edge of the fused paper 4 is once introduced into the defective paper tray 14, and then reversed, passed through the back side recording guide member 10, reversed, and transferred to the first guide member 7. The transfer unit 5 transfers the toner image on the photosensitive tram 1 to the back side, and after fixing it in the fixing unit 6, the switching mechanism 1
The liquid is discharged to the discharge port 9 through the third guide member 12 selected according to No. 5.

Therefore, the paper 4 will not be exposed from the discharge port 9 during recording, and jams due to operator error can be prevented.

and the first, second and back side recording guide members 7.8 and l.
A sensor 16 is arranged at O, and when the paper 4 passes through each guide member 7, the conveyance time of the paper 4 is detected by the sensor 16, and in the case of an abnormality, it is judged as a jam, and the defective paper is transferred to the defective paper tray. It is designed to be stored in I4.

This makes it possible to streamline the processing of defective sheets.

〔Effect of the invention〕

According to the present invention, in the case of double-sided recording, erroneous operations by operators are eliminated, paper operability is improved, and processing of defective paper due to jams etc. can be streamlined, which has great economic and industrial effects. .

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electrophotographic apparatus according to the present invention, and FIG. 2 is a block diagram of a conventional electrophotographic apparatus. In the figure, l is the photosensitive tram, 3 is the hopper, 4 is the paper,
5 is a transfer section, 6 is a fixing section, 7 is a first guide member, 8 is a second guide member, 9 is an ejection port, IO is a guide member for back side recording, 11 is an impeller, 12 is a third guide Part, 1
3 is a fourth guide member, 14 is a defective paper tray, I5 is a switching mechanism, 16 is a sensor, 100 is a latent image forming section, 200 is a developing section, and 400 is a cleaning section. carrot

Claims (2)

[Claims] (1) A photosensitive drum (1), and a latent image forming section (which forms a latent image on the photosensitive drum (1)).
100), a developing section (200) that uses toner to develop the latent image formed by the latent image forming section (100), and a developing section (200) that is fed out from the hopper (3) and conveyed through the first guide member (7). a transfer section (5) that transfers the toner image on the photosensitive drum (1) onto the paper (4); a fixing section (6) that fixes the toner image transferred onto the paper (4); A third guide member (12) that guides the paper (4) to the discharge port (9), and a fourth guide member (13) that guides the fixed paper (4) to the defective paper tray (14). a switching mechanism (15) that is provided at a branch point between the third guide member (12) and the fourth guide member (13) and guides the paper (4) to a desired guide member; a back side recording guide having one end joining the second guide member (8) between the section (6) and the switching mechanism (15) and the other end joining the first guide member (7); a member (10); and a direction provided at the confluence of the back side recording guide member (10) and the second guide member (8) and for introducing the paper (4) into the back side recording guide member (10). It consists of an impeller (11) that rotates to The paper is discharged to the discharge port (9) through the third guide member (12), and in the case of double-sided recording, the fixed paper (4) is discharged to the defective paper tray through the fourth guide member (13). After temporarily introducing the leading end into the back side (14), it is reversed and introduced into the first guide member (7) via the back side recording guide member (10), and the transfer section (5) is placed on the back side. The toner image is transferred onto the photosensitive drum (1), fixed in the fixing section (6), and then discharged to the discharge port (9) through the third guide member (12). electrophotographic equipment. (2) A sensor (16) is arranged on the first, second and back side recording guide members (7, 8, 10) according to claim 1,
) is detected and the defective paper is transferred to the defective paper tray (14).
) An electrophotographic device characterized by being housed in a.