JPS59164A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To perform double copying of an excellent operability with a copying device having original placing faces of two sides, by making both single copying mode and double copying mode selectively usable and performing the single copying or double copying in accordance with a single copying command. CONSTITUTION:The copying device of this invention has two sides of original placing faces, the 1st and 2nd surfaces, and is provided with the single copying mode, under which the exposure is performed while a lamp and scanning system are moved and a toner image on a photoreceptor 11 after development by a developing device 14 is copied on transfer paper 32 by a transferring device 25 and fixation device 45, and then, the transferred paper 32 is discharged to the outside, and the double copying mode, under which transfer paper, on which an image is transferred and fixing treatment is performed by the fixing device 45, is not discharged outside, but inverted and fed between the photoreceptor 11 and a transfer roll 30 and another image on the photosensitive body 11 is transferred on the rear side of the paper, and then, the paper is discharged outside after fixing by another fixing device 54. The single copying mode and double copying mode is selectively used in accordance with a single copying command, and two originals on the two sides of the original placing faces can be copied separately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic copying apparatus having two document placement surfaces.

Traditionally, electrophotographic copying devices only print on one side of copy paper? J.I.
A copying device is used, and a device that automatically copies on both sides of transfer paper has also been proposed, but this has not yet been put into practical use due to various technical problems. In an electrophotographic copying device that can automatically copy on both sides of transfer paper, it is desirable that copies be made at the same size on both sides of the transfer paper, and this is particularly effective when opening a book and copying both sides. It is also desirable to be able to copy only on one side of the transfer paper.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide an electrophotographic copying apparatus that has two document placement surfaces and is extremely effective and convenient for double-sided copying.

The present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 to 4, a photoreceptor 11 is formed in a cylindrical shape.
, fJ, lI'#1% position 14, copying device 15, separation device 116, transfer device fw17, separation device 18, and cleaning device 19 are sequentially arranged along the rotation direction. As shown in FIG. 2, the exposure device 131d is placed on one of the first surface B and the second surface C bordering on the central reference line A of the transparent document table 20. The image of the object to be copied, that is, the original, is sequentially exposed on a photoreceptor 11 using a slit, and is copied from a reference line at a predetermined width while moving a scanning system consisting of a lamp 21 and an oJ destination optical system. Size setting piece 2
The image of the original on the original platen 20 within the length range up to the setting line E according to 2 is subjected to primary exposure.

A switch SW9.5W11 is disposed on the reference line, and a switch 5w10.5W12 is disposed on the setting line E integrally with the copy size setting piece 22. The document table 2o is normally in a normal position as shown in the figure where the reference lines A and D coincide, and the actuating piece 23 for actuating the switches SW9 and sw io is
are fixed integrally corresponding to the reference line A. switch 5w
An actuating piece 24 for actuating the 11.5w12 is integrally fixed to the scanning system such as the lamp 21, and this actuating piece 24 is normally located on the reference line. Further, the transfer device 15 is configured using a transfer roller 25, and the transfer roller 25 is driven to rotate at the same circumferential speed as the photoreceptor 11 in the opposite direction.

The transfer roller 25i is pivotally attached to one end of the lever 26.
The lever 26 is pivoted at the center, and the other end is connected to the nJ moving shaft of the solenoid 5QL2 via a spring 27, and a return spring 28 is additionally installed between the lever 26 and the stationary frame. 25, when the solenoid 5OL2 is not operating, the lever 26 is rotated by the return spring 28 until it touches the stopper 29K and does not move away from the photoreceptor 11, and when the solenoid 5OL2 is operating, the lever 26 is rotated by the solenoid 5QL2. It rotates against the spring 28 and comes into pressure contact with the photoconductor 11.The transfer device [Cl7] is also configured using a transfer roller 30 in the same way as the transfer device 15, and when the solenoid 5OLI is activated, the transfer roller 30 is exposed to light. The transfer roller 25 is brought into pressure contact with the photoreceptor 11.Also, a charged μ may be used instead of the transfer roller to perform two transfers. A paper 32 is fed, and this paper feeding device 31 is constructed using a pair of rollers 33 and 34. This roller 33 is driven to rotate at a predetermined speed, and the roller 34 is pivotally connected to one end of a lever 35. One collar 35 is pivoted at the center, and the other end is connected to the movable shaft of the solenoid 5OL4 via a spring 36, and a spring 37 is installed between it and the stationary part.

When the solenoid 5OL4 is not operating, the roller 34 is rotated by the driving spring 37 to a position where the lever 35 touches the stopper 38 and is separated from the roller 33, and when the solenoid 5OL4 is operating, the solenoid 5OL
L4 causes the lever 35 to rotate against the spring 37 and come into pressure contact with the roller 33. The 14 sheets of paper 32 are fed one by one between the rollers 33 and 34 from the paper feed tray.
When it comes into pressure contact with the roller 33, it is sent between the photoreceptor 11 and the transfer roller 25 by the rollers 33 and 34. Separation claws are used for the separation claws at 16, and the paper is separated from the photoreceptor 11 by the separation claws.
and is fed into the endless belt 42 by the guide piece 41. Endless belt 42 is passed around rollers 43 and 44, and clutches CL2. It is designed to be rotated forward or reverse by the action of Cl3. A fixing device 45 is disposed on the endless belt 42-I, and the transfer paper conveyed by the endless belt 42 is fixed by a fixing device i45. There is a switch SW6 on the path where the transfer paper is fixed by the fixing device W45 and is conveyed by the forward rotation of the endless belt 42, and furthermore, a pair of rollers 57 and 58 that are constantly rotating are located outside the roller 44. A switch SW7 is arranged further outside of the switch SW6.

SW7 is activated for single-sided copying, and only switch SW6 is activated for double-sided copying. When the endless belt 42 is reversed, the transfer paper is guided to the endless belt 46 by the guide piece 41. The endless belt 46 is passed around rollers 47 and 48, and rotates in reverse when the clutch CL3 is in operation to convey the transfer paper guided by the guide 41 and send it between the photoreceptor 11 and the transfer roller 30.

A switch SW5 is arranged on the path along which the transfer paper is conveyed by the endless belt 46, and this switch SW5 is activated by the transfer paper. The separating device @1B uses a separating claw, and the 14 sheets separated by the separating claw are separated by guide plates 49.degree. −μjj
;r1'M Belt 51 is passed over rollers 52 and 53, and a fixing device 54 is disposed on either side. A switch SW8 is arranged between the fixing device 54 and the paper discharge port, and this switch SW8 is activated by the transfer paper. Also, the cam 55 is connected to the photoreceptor 11 via the clutch CLI and the #Ri mechanism 56, and the switch SW is connected around the cam 55.
I to SW4 are arranged.

Now, if we connect the terminals Bl and B2 to the AC m source and close the main switch MS, the output of the AC power source will be
is applied to the terminals B3 and B41tfJ via the fuser 45.
The I-bar driven iLl timer TI is powered.

When the single-sided printed switch ssw is closed in this state, the relay RA2 is activated and closes its normally open contact RA2-al' to maintain its non-self-holding state, and the normally open contact RA2-a2゜R
Close A2- a3 and close it, RA2- M ~ R
Open A2-A3. Relay RAI is a normally open contact RA
2-a2 is activated by closing its normally open contact RAI-a
l is closed and self-maintained, and the normally open contact RAI -a
Close 2~RAI-, +5. This normally open contact RAI-
Closing of a2 activates relay RA4 and its normally open contact R
, A4-. +1 for self-holding by closing the normally open contacts RA4-a2. ) lA4-a3'<close. By closing this normally open contact RA4-a3, solenoid 5O
L2 and 5OL3 are operated, and the transfer roller 25 is brought into pressure contact with the photoreceptor 11, and the separating claw 16 is brought into contact with the photoreceptor 11. In addition, when the normally open contacts RAI-a4 are closed (e), the clutch CL2 is activated and the endless belt 42 is rotated in the forward direction, and the charging device 12 is operated by being supplied with power output by the closing of the normally open contacts RA1-a5. 11 is charged. Clutch CLI is actuated by the closing of normally open contact RA], -a3, and cam 55 is rotationally driven. Switch sw1 is
It closes when rotated from its normal position. Thereafter, when the switch SW2 is closed by the cam 55, the relay RA6 is activated to close its normally open contact RA6-al and maintain itself, and the normally open contacts RA6-a2 and RA6-a
3 and open the normally closed contact RA6-b. By closing the normally open contact RA6-a2, the lamp 21 lights up, and by closing the normally open contact RA6-a3, the motor M3 rotates in the normal direction, causing the lamp 21 and the optical system to move in the direction of the arrow in the figure, so that the document table 2o is turned on. The image of the document on the first sheet B is exposed to light on the photoreceptor 11, and an electrostatic latent image thereof is formed. This electrostatic latent image is developed with toner by imager 14. When the lamp 21 and the optical system are started, the actuating piece 24 is started simultaneously and the switch S W 11 is closed. The lamp 21 and the optical system move to the original f to the setting line E by the copying enzyme setting piece 22.
f: 10) When the image is exposed, the switch S included 712 is activated by the activation piece 24, and the relay RA6 is reset. At the same time, the lamp 21 goes out and the motor M3 reverses, the lamp 21 and the optical system return, and the switch 5W12 returns to its original state. In the case of one-sided copying, the first part B and the second part C on the document table 20
Switch 5W when changing the soil I@槁 to 77, compound η'
13 is closed. Therefore, when switch 5W13 is closed, when switch 5w12 is activated, relay RA7 is activated and closes its normally open contact RA7-al for self-holding, and also closes normally open contact RA7-a2 and normally closed contact RA7-b. to open. This normally open contact RA7-
By closing a2, the document table 2o is driven by the motor M4 in the direction of the arrow 1. When the original fμ stand 2 [) moves, the actuating piece 23 moves at the same time and the switch SW9 closes. When the original platen 20 moves and its l, U directrix A reaches the setting line E by the multi-gauge size setting 22, the switch 5WIO is activated by the actuating piece 23, and the motor M4 is stopped]-
Then, the document table 20 stops. When the rung 24 and the optical system come to their normal positions, the switch SW is activated by the actuation piece 24.
11 opens and the motor M3 stops [Then, the lamp 21 and the optical system stop. Thereafter, when the switch sw3 is closed by the cam 55, the solenoid 5OL4 is activated and the transfer paper 32 is sent between the transfer roller 25 and the photoreceptor 11, and the toner is transferred from the photoreceptor 11 to the transfer paper 32 η: be done. The transfer paper is separated from the photoreceptor 11 by the separation claw 16, guided by the guide plates 39 and 4 (l), fed to the endless belt 42 by the guide piece 41, conveyed by the endless belt 42, and transferred to the fixing device 45 during the conveyance. When the toner is fixed on the transfer paper by the fixing device 45, when the switch SW6 is activated, the relay RAI is reset and the charging device @12 is deactivated, and the relay RA3 is activated and its normally open contact is activated. ■1A3-; 11 f closes and holds itself, and normally open contact RA3-a2 is closed to supply timer T 71?, normally open contact ■ζA3-hl,
Open RA3-b2.

By opening this normally closed contact RA3-b2, solenoid 5
OLZ, 5OL3 returns and the transfer roller 25 and separation claw 16 are separated from the body 11. The rolled paper that has been fixed by the fixing device 45 is further conveyed and discharged to the paper output tray, but in the middle of the process, the switch SW7 is actuated to activate the relay RA2. RA4 stops working and timer T
The power supply stops and the electrical system is released. Therefore, the transfer paper will be ejected with 9M 'li' on the front side, and its compound '4: What is the size? Now: Size setting piece 22
TiJ can be changed by moving . When the switch 5W13 is closed, the switch SSW is closed before the set time of about 20 seconds has elapsed after the timer Tl is turned off by the switch SW7, and the exposure for the next close-up operation is performed. and manuscript table 20
The original on the second side C of is copied in the same way. Timer T1
turns on and its normally open contact TI-a returns,
When the relay RA7 returns and the motor M4 reverses and returns to the document table, the switch SW9 is opened by the operating piece 23, the motor M4 is stopped, and the document table 20 is stopped.

Therefore, when the switch 5W13 is closed, the originals on the first side B and the second side C on the original 1μ stand 20 are alternately copied on the side. When the switch 5W13 is closed, only the original on the first side B of the original platen 20 is copied.

In addition, when double-sided printed switch DSW is closed with main switch MS closed, relay RAI is activated, and its normally open contact RAI-al is closed and self-holding, and the normally open contacts RA2-a2 to RA2- 35 is closed. By closing this normally open contact RAI-a2, relay RA
4 operates, and its normally open contact RA4-al closes and self-holds, and the normally open contacts RA4-a2, RA4-
Close a3. By closing the normally open contact RA4-a3, the solenoids 5OL2 and 5OL3 are activated, and the transfer roller 25 is brought into pressure contact with the photoreceptor 11, and the separating claw 16 is brought into contact with the photoreceptor 11. Furthermore, when the J contact RAI-a4 is closed, the clutch CL2 is operated to rotate the endless belt 42 in the forward direction. Also, normally open contact RAI-a
5 closes, the charging device 12 is supplied with a power output and operates to charge the photoreceptor 11, and the charging device 12 is charged to the open contact R at 1-a3.
Clutch CLI is actuated by closing and connecting, and cam 55 is rotationally driven. The switch SWl closes when the cam 55 rotates from the normal position. After that, switch SW2 is set to cam 55.
When the relay RA6 is closed, the relay RA6 operates and closes its normally open contact RA6-al for self-holding, and also closes the normally open contacts RA6-a2 and RA6-a3 to maintain the normally open contact RA6-. Release h. This normally open contact RA6
- The lamp 21 is lit by the closing of the contact a2, and the motor M3 rotates forward by the closing of the normally open contact RA6-a3.
Then, the image of the document B0 is exposed to light (11) and an electrostatic latent image thereof is formed. This electrostatic latent image is transferred to the developing device fFl'1
4, the toner is evenly applied 1→". When the lamp 21 and the optical system start, the actuating piece 24 starts at the same time and the switch 5WII closes. The lamp 21 and the optical system move and the setting line E is set by the copy size setting piece 22. When the image of the original is turned off, the actuating piece 24 turns the switch 5W1.
2 is activated and relay RAfi returns. Therefore, as soon as the lamp 21 goes out, the senter M3 reverses and the lamp 21
And the optical system is restored.

Chi5w12it returns. When the lamp 21 and the optical system come to their normal positions, the actuating piece 24 moves the switch 48W1.
When the switch 5W12 opens, the motor M3 stops and the lamp 21 and the optical system stop.
When activated, relay RA7 operates, closing its normally open contact RA7-21 for self-holding, closing its normally open contact RA7-a2, and opening its normally closed contact RA7-h. By closing this normally open contact RA7-a'lv), the document table 20 is driven by the motor M4 in the direction of the arrow t in the figure.

At the same time as the document table 20 moves, the actuating piece 23 moves and the switch SW9 closes. When the document table 20 moves and its base line A reaches the setting line E formed by the copy size setting piece 22, the switch 5W10 is actuated by the operating piece 23, the motor M4 is stopped, and the document table 20 is stopped.

Thereafter, when the switch SW3 is activated by the cam 55, the solenoid 5OL4 is activated and the transfer paper 32 is transferred to the transfer roller 2.
The toner is fed between the photoreceptor 5 and the photoreceptor 11, and the toner is transferred from the photoreceptor Jl onto the transfer paper 32. The paper is separated from my 5Y body 11 by separating claw 1.6.
L guide plate 39.4 (L guide J'8I41
It is fed into the endless belt 42 by the endless belt 42.
During the conveyance, the toner is fixed by the fixing device 45. So) %-C7j: M Kaswitch SW
When 6 is activated, the 1 NO RAI is restored and the charging and installation are completed.
12 returns, the clutch CL2 returns, and the endless belt 42
stops. Also, by operating switch SW6, l/
-RA3 is activated, and its normally open contact RA3- ;
, l also opens A3-b2. This normally closed contact RA3-
Opening h2 causes solenoid SOI, 2.

8OL3 is returned and transferred q, and the roller 25 and separation claw 16 are removed from the photoreceptor 11. The cam 55 passes through the switch SW4 and continues to rotate. When the set time elapses after the timer T is supplied with power, it operates and its normally open contacts T-a1 to T-
Close A5 and open normally open contact T-b.

By closing this normally open contact T-a2, solenoid 5OLI
is activated, the roller 3o is pressed against the photoreceptor 11,
By closing the normally open contact T-a3, the clutch C1,1 continues to operate and the cam 55 continues to rotate. Also, normally open contact T-
When a4 is closed, clutch CL3 is activated and an endless bell is generated)
42 and 46 are reversed, the transfer paper on the endless belt 42 is conveyed, and the charging device t1 is closed by closing the normally open contact T-A5.
2 operates, and the photoreceptor 11 is charged. switch S
W6 rotates and returns when the paper passes, and when the switch SW5 is actuated by the transfer paper, the clutch CL3 returns and the endless belts 42, 46 stop. When the switch SW2 is actuated by the cam 55, the relay RA6 is actuated to close its normally open contacts RA6-, '11 and hold the normally open contacts RA6-A2. Close RA6- and +3 and open normally closed contact RA6-b. This normally open contact RA6-
When A2 is closed, rung 21 lights up, and the normally open contact R
When A6-A3 is closed, the motor M3 rotates in the normal direction, and the lamp and optical system move in the direction of the arrow shown in the figure, and the second surface C of the document table 20 is moved.
The image of the upper document is exposed to light on the photoreceptor 11, forming an electrostatic latent image thereof.

This electrostatic latent image is developed with toner by a developing device 14. When the lamp 21 and the optical system start, the operation ha 24
start at the same time and switch SWI1 closes.

The lamp 21 and the optical system move and the copy size setting piece 22
When the original image is exposed up to the setting line t], the actuating piece 24 activates the switch 5W12 and the relay IIM
) returns. Therefore, when the lamp 21 goes out, the motor M3 reverses, the lamp 21 and the optical system return, and the switch 5W12 returns to its original state. When the lamp 21 and the optical system come to their normal positions, the actuating piece 24 activates the switch 5WII.
is opened and the motor M3 is stopped r1; the shutter rung 21 and the optical system are stopped. Thereafter, the switch SW3 is closed by the click 55, but the solenoid 5OL4 is not activated and the transfer paper is not fed. Next, when switch SW4 is actuated by cam 55, relay RAS is actuated and its normally open contact RA5-
AL is closed and self-retained, and the normally open contact RA 5-
Build A2 into N1. By closing this normally open contact RA5-A2, the clutch CL3 is activated and the endless belt 42.4 is closed.
6 resumes the reversal. Therefore, the transfer material on the endless belt 46 is fed between the photoreceptor 11 and the transfer roller 30, and the toner is transferred from the photoreceptor 11 to the transfer paper.As a result, copies are made on both sides of the transfer paper. Separation claw 1
The image is separated from the photoreceptor 11 at 8K, guided by guide plates 49 and 50, and conveyed by an endless belt 51, and is fixed by a fixing device 54 during the conveyance. The fixed transfer paper is discharged onto a paper discharge tray, and at this time the switch SW8 is activated. By the operation of this switch SW8, l/-RA3
, RA4, timer T, sI/-RA5,
IIA7 returns, solenoid 5OLI returns, transfer roller 30 separates from photoreceptor 11, clutch CL3 returns, and endless belts 42, 46 stop. Then, the motor M4 is reversed and the document table 20 is returned to its original position.
When it returns to its normal position, the actuating piece 23 opens the switch 79, stops the motor M4, and the L document table 20 stops. The images of the original on the first side B and second side C on the original table 2 () of the transfer sheet discharged to the paper output tray are copied onto the screen, and the sizes of the copies on both sides are equal to each other. The copy size can be arbitrarily set using the copy size setting piece 22.

As described above, with the electrophotographic vJ and copying system of the present invention, it is possible to copy two originals on two original document mounting surfaces separately, so it is possible to copy on both sides of the transfer paper. 'q-You can also check only Ham1 of the paper. In addition, it is necessary to replace not only the two sides of three-dimensional objects but also the left and right pages of books etc.
"can.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the copying milk copying apparatus according to the present invention, FIG. 2 is a block diagram showing a part of the colors of the fog light device in the same embodiment, and FIGS. 3 and 4 are the above-mentioned FIG. 1 is a circuit diagram showing a 5-gas system in Example 1). DESCRIPTION OF SYMBOLS 11... Photoreceptor, 12... Charging device, 13... Exposure device, 14... Developing device, 15... Transfer device, 1
6...Separating device, 17...Transfer device, 18...Separating device, 20...Document stand, 21...Lamp, 22...
First time size setting piece, 23. 24... Actuation piece, 8W9
~5W12...Switch, 31...Paper feeder, 45
．． 54...Fixing device. 7F-k6￥;irt,y,i,,IE"Ml
<Jj=L>Tokumar'1 Director General Wakasugi Wainu 1ull Indication 1982 Patent Application No. 43677 2 Title of Invention Electrophotographic Copying Device 3 Relationship with Person Performing Supplementary IL 1 Name of Patent Applicant Name (674) Ricoh Co., Ltd. 4 Agent Address Q7-1, 4-5-4 Kyodo, Noritaya-ku, Tokyo

Claims (1)

[Claims] This is a device that can be used selectively for the 1-plane image 2 mode and the double-sided initial force mode, based on a single copy command f, respectively. Take a real bamboo 7
The electricity you get is 1.
1,