JPS6060668A - Dual mode electrophotographic device - Google Patents

Abstract

PURPOSE:To eliminate the need to generate data for erasure and install a dedicated device, and simplify and reduce the constitution of a dual mode electrophotographic device in size by sttain the erasure by using a one-line simultaneous driven LED array which forms a print image on a photosensitive body in dual mode. CONSTITUTION:An original image and a print image are formed on the photosensitive belt by an exposure optical system 7 and the one-line simultaneously driven LED array 8 to perform dual mode electronic copying operation. This array 8 is controlled with an all-reset signal passed through a control circuit and a reset signal corresponding to copy paper width, and the erasure on the photosensitive belt is performed by turning all of the array 8 except at an image part or turning on the array 8 corresponding to the part other than an image part width correspondence part at an erased image part. Consequently the erasure is carried out without generating the data for erasure nor providing any dedicated device, and the constitution of the dual mode electrophotographic device is simplified and reduced in size.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a dual mode electrophotographic device capable of selecting a copying mode and a printing mode.

BACKGROUND ART A conventional device of this type is disclosed in Japanese Unexamined Patent Publication No. 52-67332. Here, an erase function is required in copy mode, and rask scanning 1!3. The structure is used as an end erase entry in copy mode. However, since rask scanning (laser polygon) is used, it is necessary to generate erase section data, which requires memory. Furthermore, in the case of 1137 formation of a laser medium polyurethane, the entire machine becomes large, and the cost of circuit formation also increases.

Purpose of the Invention The present invention has been made in view of the above points, and is a dual mode electrophotographic device that can press the erase function 50 times without requiring special generation of erase data and without requiring a dedicated memory. The aim is to obtain.

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

First, FIG. 1 shows an outline of the entire apparatus, and the parts around the photoreceptor bells 1 to 10, which are supported and rotated by U-ra, are arranged according to the electrophotographic process; A transfer charger 4, a charge eliminating charger 5, and a cleaning device @6 are provided.+'j: Charger 2
・Between the developing device 3, there is a light optical system 7 for copying and an L for printing.
The ED array 8 is connected to the eye.
The reflected light passes through mirrors +1, 12, 13, lens 14, and mirror 15 to form an electrostatic latent image on photoreceptor belt 1 as document 4q.

After this latent image is developed, it is transferred to any of the cassettes 16a to 16a.
16c, transfer paper rollers 17a to 17c, and transfer paper 19a to 19a fed at predetermined timing by registration rollers 18.
19c, this transfer 19 passes through a fixing device 20 and is discharged onto a tray 22'' by a discharge roller 21.

In this manner, copy mode operation is performed.

On the other hand, the LED array 8 is connected to the SELFOC lens array 23.
Together with this, it constitutes an optical writing head, and when in print mode, image data is given from an external device, and each LED is turned ON/○F1? for each line. The control is carried out, a printed image is formed on the photoreceptor bell l-1, and subsequent printing is performed in the same manner as in the reproduction mode.

In this way, a dual mode of copying mode (including reduction and enlargement) and printing mode is selectively performed, but in copying mode, the transfer paper 19a to 19 used
As shown in FIG. 2, the erase dimensions on the photoreceptor bell 1-1 vary depending on the size of c. Here, the image is the center reference, and the image is engraved to the width W1 of the photoreceptor belt 1, and the transfer paper 19 is
It is necessary to erase the transfer paper width W a for passing paper II, the morning paper width wb for the transfer paper 19b, and the both side portions excluding the transfer paper width wc for the transfer paper L9c. This is the width direction of the photoconductor, but the same is true for the traveling direction of the photoconductor bells 1 to 1 (m), from when the copy printer hSW is pressed to the leading edge of the image, and from there onwards j (16 Gara 6
Transfer paper], 34X excluding the length of 9 a-19c,
You only need to erase a small length from where you think the rear end of the size will be.

In this embodiment, such erasing is performed using the LED array 8 provided for printing. In this embodiment, the L F and D arrays 8 are of the 1-line simultaneous drive type (length w2), and the print mode is shown in the block diagram shown in FIG.
4. A tarok signal, an ENABLE signal, and a 5TROBE signal are sufficient between the control circuit 25. However, since it is used for erasing in the copy mode, the control circuit 25 sends the recell 1-a signal and the recell 1-a signal to the pin 1-driver 24.
-b signal, recell lc signal, and auto-reset signal are selectively given. For example, if the mode switch is set to the copy mode and the transfer paper 19a is used, first, all reset signals 1 to 1, up to the leading edge of the image, and the E
All bits of the LED array 8 are turned on by the NABLE signal, and erasing is performed. Then, a reset signal a corresponding to the size of the transfer paper 19a is selected from the leading edge of the image, and a cell corresponding to the width Wa of the transfer paper is turned off, and the bits on both sides of the LED array 8 are turned on. Then, the portion excluding Wa is erased. Thereafter, all bits of the LED array 8 are turned on by an all-reset signal for a certain distance from the rear end of the image fp, and erasing is performed at the same time C at the leading end. And E N A B
When the L E signal is turned OFF, all bits of the LED array 8 are turned off. Similarly, if the transfer paper 19b or 19c is used, cell I-(number a or recell 1 to signal C are selected) depending on the size of each sheet. (LEI) In the array 8, only a portion of the pin 1 corresponding to wb and Wc is turned off, and erase is performed by the portions of the pins 1 to 1 on both sides thereof. Therefore, the reproduction mode
There is no need for a dedicated erase for each F, there is no need to separately generate data for erasing, and there is no need for a dedicated memory. In this regard, I am thinking of using an mXn 71-lix drive type LED array, but -(
If the lace part is fixed at an integer multiple of m pitch 1~, a decoder etc. will be required for each round. death,
According to this embodiment, the rudder is of the line simultaneous drive type;
There is no such disadvantage, and ZJ responds to various problems. In addition, in Fig. 2, the center J and % r(!i were explained, but
Even in the case of one-sided determination as shown in FIG. 4, there is no problem as long as the bit to be reset is changed.

Effects As described above, the present invention provides an LED array driven simultaneously by a mirror for printing, and uses this LED array to perform the erase operation in copy mode 11'I, so a dedicated eraser is not required. Of course, there is no need to specially generate erase data, no dedicated memory is required, and the device can be made at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic side view, FIG. 2 is a plan view showing dimensional relationships, FIG. 3 is a block diagram, and FIG. 4 is a plan view showing a modified example. be. ■...Photoreceptor, 7...Exposure optical system, 8...LED
Array applicant Ricoh Co., Ltd.” Figure 7! 11 Masakichi (voluntary) 1. Case description 4-+i Junsho 58 170480 No. 2, Name of invention Dual mode electrophotographic device Address 1-3-6-4 Nakamagome, Ota-ku, Tokyo, Agent
Person 〒107 N/A 6, Subject of amendment 1 Temple Gansho 58-17048+] No. Ura Masa, I: Regarding this application, the statement in the description is amended as follows. Note 1, page 4, line 10, ``Copy Pudding l-'S W
Add "(not shown)" after J. 2. Set "O1-RESET1-SIGNSHI)" on the 5th line of page 5 to "ALL RESET SIGNAL". 3. In the role of "Motos-r Tsuji" on page 5, line 6, "(
(not shown).

Claims (1)

[Claims] an exposure optical system for copying that forms an original image on a photoreceptor;
This is a patented technology that includes a LED array that drives one line simultaneously for printing to form a printed image on a photoreceptor based on image data, and that erase operation is performed by the LED array during copy mode. Mode electrophotographic equipment.