JPS6063555A - Electrophotographyic copying device - Google Patents

Abstract

PURPOSE:To execute efficiently copying by providing a means for scanning and exposing separately originals on the first surface and the second surface of an original placing plate and forming a latent image, and setting selectively a use of both and a use of one of the first surface and the second surface. CONSTITUTION:When a lamp 21 and an optical system move and an image of an original is exposed to a set line E by a copying-size setting piece 22, an SW12 is operated by an operating piece 24, and a relay is reset. Accordingly, the lamp 21 is turned off, also a motor rotates in reverse, the lamp 21 and the optical system are treturned, and the SW12 is reset. When the optical system comes to its original stationary position, an SW11 is opened and the motor stops. The transfer paper on an endless belt 46 is fed in between a photosensitive body 11 and a transfer roller 30, and a toner is transferred to the transfer paper from the photosensitive body 11. As for the transfer paper discarged to a paper discharge plate, an image of an original on the first surface B and the second surface C in an original placing plate 20 is copied to both surfaces. In this way, two originals can be placed simultaneously on the original placing plate and can be copied, therefore, copying can be executed efficiently.

Description

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

(Prior Art) Conventionally, an electrophotographic copying device has been used that copies a single original placed on a one-sided document table onto only one side of copy paper, and the document is placed one page at a time on the document table. copying efficiency is low.

(Objective) In view of the above points, it is an object of the present invention to provide an electrophotographic copying apparatus that can improve copying efficiency.

(Structure) The present invention includes a document table on which originals can be placed side by side on the first and second surfaces, and each document on the first and second surfaces of the document table is individually scanned and exposed onto a photoreceptor. an exposure means for forming a latent image;
A means for developing each of the latent images formed on the photoreceptor by the exposure means and transferring them onto one side of the transfer paper, and selectively setting the use of both the first side and the second side or the use of one side. and a control means for selectively copying each original on the first side and the second side and copying the original on the first side by setting the means.

Next, one embodiment of the present invention will be described.

As shown in FIGS. 1 to 4, the photoreceptor 11 is formed into a drum shape, and around it is a charging device 12, an exposure device 13, a developing device 14, a transfer device 15, a separation device 16, and a transfer device 17.
, a separating device 18, and a cleaning device 19 are sequentially arranged along the rotation direction. As shown in FIG. 2, the exposure device 13 is used to detect an object to be copied placed on one of the first surface B and the second surface C bordering on the central reference line A on the transparent document table 20, that is, as shown in FIG. The image of the original is sequentially exposed on the photoreceptor 11 through a slit, and while the scanning system consisting of the lamp 21 and the movable optical system is moved, the setting line E is set by the copy size setting piece 22 along the reference line at a predetermined width. The image of the original on the original platen 20 within the length range up to the original position is sequentially exposed. Switch SW9.5w1 is on the reference line
1 is placed and switches 5WIO, 5lil12
is arranged on the setting line E integrally with the copy size setting piece 22.

The document table 20 is normally in a normal position as shown in the figure, where the reference lines A and D coincide, and an operating piece 23 for operating the switches SW9 and SW10 is fixed integrally in correspondence with the reference line A.

An actuating piece 24 for actuating the switch 5VI1.5W12 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 25 is pivotally connected to one end of a lever 26, and the lever 26 is pivotally supported at the center, and the other end is connected to the movable shaft of the solenoid 5OL2 via a spring 27 and returned between it and a stationary member. A spring 28 is attached. When the solenoid 5OL2 is not activated, the transfer roller 25 is rotated by the return spring 28 to a position where the lever 26 touches the stopper 29 and is separated from the photoreceptor 11, and when the solenoid 5OL2 is activated, the lever 26 is rotated by the solenoid 5OL2. It rotates against the spring 28 and comes into pressure contact with the photoreceptor 11.

The transfer device 17 is also configured using a transfer roller 3o like the transfer device 15, and the transfer roller 30 is brought into pressure contact with the photoreceptor 11 when the solenoid 5OLI is activated. Further, a charger may be used in place of the transfer roller to perform the transfer. Transfer paper 32 is fed from a paper feeder 31 between the transfer roller 25 and the photoreceptor 113-.
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 a roller 34 is pivotally connected to one end of a lever 35.

The lever 35 is pivotally supported at the center, and the other end is coupled to the movable shaft of the solenoid 5OL4 via a spring 36, and a spring 37 is attached between the lever 35 and the stationary member. and roller 3
When the solenoid 5OL4 is not operating, the lever 35 is rotated by the return spring 37 to a position where it hits the stopper 38 and is separated from the roller 33, and the solenoid 5O
When L4 is activated, the lever 35 is rotated by the solenoid 5OL4 against the spring 37 and is pressed against the roller 33. The transfer paper 32 is sequentially transferred one by one from the paper feed tray to the roller 33.
When the roller 34 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. The separating device 16 uses a separating claw, and the transfer paper separated from the photoreceptor 11 by the separating claw is guided by guide plates 39 and 40 and sent to an endless belt 42 by a guide piece 41.

The endless belt 42 is stretched around rollers 43 and 44, and is rotated forward or reverse by the operation of clutches CL2 and Cl3. A fixing device 45 is provided on the endless belt 42.
is arranged, and the transfer paper conveyed by the endless belt 42 is fixed by this fixing device 45. The transfer paper is fixed to the fixing device 45
There is a switch 5Ii16 on the path where the endless belt 42 is fixed and transported by normal rotation of the endless belt 42, and furthermore, there is a pair of rollers 57 and 58 that are constantly rotating outside the roller 44, and 5III7 is arranged, and the switches 5IN6 and SW7 are activated in the case of single-sided copying, and only the switch 5ld6 is activated in the case of double-sided copying. endless belt 4
2 is reversed, the transfer paper is guided to the endless belt 46 by the guide piece 41. Endless belt 46 has rollers 47.48
When the clutch CL3 is in operation, the transfer paper is rotated in reverse and guided by the guide piece 41, and is conveyed and sent between the photoreceptor 11 and the transfer roller 3o. A switch SV5 is installed on the path along which the transfer paper is conveyed by the endless belt 46.
is arranged, and this switch Sw5 is activated by the transfer paper. The separation device 18 uses separation claws, and the transfer paper separated by the separation claws is guided by guide plates 49 and 50 and conveyed to a paper discharge port by an endless belt 51. The endless belt 51 is passed around rollers 52 and 53, and a fixing device 54 is installed above it.
is placed.

A switch SV8 is arranged between the fixing device 54 and the paper discharge port, and this switch SV8 is activated by the transfer paper. Further, the cam 55 is connected to the photoreceptor 11 via a clutch CLI and a gear mechanism 56, and a switch S is arranged around the cam 55.
SW1 to SW4 are arranged.

Now, if we connect terminals B1 and B2 to the AC power supply and close the main switch MS, the output of the AC power supply will be connected to the fuse F.
is applied between terminals B3.84 through fixing device 45.
The developing device 14 and the cleaning device 19 are brought into operation by the remoter M1, the photoreceptor 11 is rotationally driven, and the timer T1 is supplied with power.

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 self-hold, and the normally open contacts RA2-a2, RA2
- Close B3 and normally open contact RA2-bl ~ RA2-b3
to open. Relay RAI operates by closing normally open contact RA2-a2, closes normally open contact RAI-al and maintains itself, and normally opens contacts RAI-a2 to RAI-a.
Close 5. Closing of this normally open contact RAI-a2 activates relay RA4, which closes its normally open setting RA4-al and maintains itself.
4-Close B3. By closing the normally open contact RA4-a3, the solenoids 5OL2, 5OL3 are actuated, and the transfer roller 25 is pressed against the photoreceptor 11, and the separating claw 16 is also brought into contact with the photoreceptor. Furthermore, when the normally open contact RAI-a4 is closed, the clutch CL2 is actuated to cause the endless belt 42 to rotate forward, and when the normally open contact RAI-a5 is closed, the charging device 12 is supplied with power and operates to charge the photoreceptor 11. Charge. The clutch CLI is activated by closing the normally open contact RAI-a3, and the cam 55 is rotationally driven. Switch SVI is cam 5
When 5 rotates from its normal position, it closes. Thereafter, when switch SV2 is closed by cam 55, relay RA6
operates to close its normally open contact RA6-al and maintain itself, while also closing its normally open contacts RA6-a2 and RAS-B3 and opening its normally open contact RA6-b. This normally open contact RA
6-a2 is closed, the lamp 21 is turned on, and the normally open contact RA6-a3 is closed, which causes the motor M3 to rotate forward, causing the lamp 21 and the optical system to move in the direction of the arrow force 7- shown in the figure, and to move the lamp 21 to the document table 20. The image of the original on one side 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 a developing device 14. When the lamp 21 and the optical system start, the actuating piece 24
start at the same time, and switch 3w11 closes. When the lamp 21 and the optical system move to expose the original image up to the setting line E formed by the copy size setting piece 22, the actuating piece 24
This activates switch SII+12 and restores relay RAS. Therefore, when the lamp 21 goes out, the motor M3 reverses, the lamp 21 and the optical system return, and the switch 5
V12 returns. In the case of one-sided copying, the switch 5V13 is closed when the originals on the first side B and the second side C of the original platen 20 are alternately copied. Therefore switch 5V13
When the switch 5W12 is closed, the relay RA7 is activated and closes its normally open contact RA7-al for self-holding, while also closing the normally open contact RA7-a2 and opening the normally open contact RA7-b. do. This normally open contact RA7-a
2 is closed, the document table 20 is driven by the motor M4 in the direction of the arrow shown in the figure. When the document table 20 moves, the actuating piece 23 moves at the same time, and the switch SW9 closes. When the document table 20 moves and its reference line A reaches the setting line E formed by the copy size setting piece 22, the switch 5vto is actuated by the operating piece 23, the motor 2 is stopped, and the document table 20 is stopped. When the lamp 24 and the optical system come to their normal positions, the actuating piece 24 activates the switch 5lill.
opens, motor N3 stops, and lamp 21 and optical system stop. After that, when the switch SV3 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. . The transfer paper is separated from the photoreceptor 11 by a separating claw 16 and placed on a guide plate 39.
．． 40, is fed into the endless belt 42 by the guide piece 41, is conveyed by the endless belt 42, and during the conveyance, the fixing bag! 45, the toner is fixed. This transfer paper is a fixing device! When switch SV6 is activated after fixing at step 45, relay RAI is restored and charging device 12 is deactivated, and relay RA3 is activated to close its normally open contact RA3-al to maintain its self-holding status and to remain normally open. Contact RA3-a2 is closed to supply power to timer T, and normally open contacts RA3-bl and RA3-B2 are opened. By opening this normally open contact RA3-b2, solenoid 5OL2.5O
L3 returns and the transfer roller 25 and separation claw 16 move to the photoreceptor 1.
Move away from 1. The transfer paper 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 5li17 is activated, relays RA2 and RA4 are deactivated, the timer T stops power supply, and the electrical system is released. be done. Therefore, the transfer paper is copied on one side and then discharged, and the copy size can be changed by moving the copy size setting piece 22. switch 5I
When N13 is closed, if the switch SSw is closed before the set time of about 20 seconds has elapsed after the timer TI is turned off by the switch SW7, and the exposure for the next copying operation is performed, the original platen is opened. The original on the second side C of No. 20 is copied in the same manner. When the timer TI is turned on and its normally open contact Tl-a is restored, the relay RA7 is restored, the motor M4 is reversed, the document table 20 returns to its original position, and the document table 20 returns to its original normal position. At this time, switch SW9 is opened by operating piece 23, motor M4 is stopped, and 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 platen 20 are alternately copied on one side. When the switch 5V13 is not closed, the original platen 20
Only the original on the first side B of is copied.

Also, when the double-sided print switch DSW is closed with the main switch MS closed, the relay RAI is activated.
The normally open contact RAI-al is closed for self-holding, and the normally open contacts RA2-a2 to RA2-a5 are closed. Relay RA4 is actuated by the closing of normally open contact RAI-a2, which closes normally open contact RA4-al for self-holding and also closes normally open contacts RA4-a2 and RA4-a3. By closing this normally open contact RA4-a3, the solenoid 5OL2.5OL3 is actuated, and the transfer roller 25 is brought into pressure contact with the photoreceptor 11, and the separating claw 16 is pressed against the photoreceptor 11.
is brought into contact with. Further, by closing the normally open contacts RA1-a4, the clutch CL2 is actuated to rotate the endless belt 42 in the forward direction. Further, when the normally open contact RAI-a5 is closed, the charging device 12 is supplied with power output and operates to charge the photoreceptor 11, and when the normally open contact RAI-a3 is closed, the clutch CLI is operated and the force 11-m is activated. 55 is rotationally driven. The switch SWI closes when the cam 55 rotates from the normal position. Then switch S
When W2 is closed by the cam 55, the relay RA6 operates to close its normally open contact RA6-al and maintain itself, and also closes the normally open contacts RA6-a2 and RA6-a3 to become a normally open contact. Open RA6-b. This normally open contact RA6-
The lamp 21 lights up when a2 is closed, and the normally open contact R
When A6-a3 is closed, motor M3 rotates forward and lamp 21
Then, the optical system moves, and the image of the original on the first surface B of the original platen 20 is exposed to the photoreceptor 11, thereby 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 actuating piece 24 starts at the same time and the switch 5WII closes 6.
The lamp 21 and the optical system move and the copy size setting piece 22
When the image of the original is exposed to the setting line E, the switch 5W12 is activated by the activation piece 24, and the relay RA6 is reset. Therefore, when the lamp 21 goes out, the motor M3 reverses, the lamp 21 and the optical system return, and the switch 5
W12 returns. When the lamp 21 and the optical system come to their normal positions, the switch 5WII is opened by the operating piece 2412-, the motor 3 stops, and the lamp 21 and the optical system stop. Also switch 5V
12 is actuated by actuating piece 24, relay RA7 is actuated and closes its normally open contact RA7-al for self-holding, and closes its normally open contact RA7-a2 to close normally open contact RA.
Open 7-b. By closing the normally open contact RA7-a2, the document table 20 is driven by the motor M4 in the direction of the arrow shown in the figure.

At the same time as the document table 20 moves, the actuating piece 23 moves and the switch 5li19 closes. When the document table 20 moves and its reference line A reaches the setting line E formed by the copy size setting piece 22, the switch 5VIO is actuated by the operating piece 23, the motor M4 is stopped, and the document table 20 is stopped. After that, when the switch S13 is actuated by the cam 55, the solenoid SO
The transfer paper 32 is transferred to the transfer roller 25 and the photoconductor 1 by the transfer paper 32.
1 and the toner is transferred from the photoreceptor 11 to the transfer paper 32. The transfer paper is separated from the photoreceptor 11 by the separation claw 16, guided by the guide plates 39 and 40, and fed to the endless belt 42 by the guide piece 41.
2, and the toner is fixed by a fixing device 45 during the transportation. When the transfer paper activates the switch SW6, the relay RAI returns, the charging device 12 returns, the clutch CL2 returns, and the endless belt 42 stops. In addition, the relay RA3 is activated by the operation of the switch SW6, and the normally open contact RA3-at is closed to hold the relay RA3, and the normally open contact RA3-a2 is closed to supply power to the timer T, and the normally open contact RA3-bl is closed. , RA3-b2 is released. By opening this normally open contact RA3-b2, solenoid 5OL2
．． 5OL3 returns and the transfer roller 25 and separation claw 16 are separated from the photoreceptor 11. Cam 55 is switch 5li14
It passes through 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-al~T
-a5 is closed and normally open contact T-b is opened. By closing the normally open contact T-a2, the solenoid 5OLI is actuated and the transfer roller 30 is pressed against the photoreceptor 11, and the normally open contact T-a2 is closed.
By closing a3, clutch CL1 continues to operate and cam 5
5 continues to rotate. Further, when the normally open contact T-a4 is closed, the clutch CL3 is actuated, the endless belts 42 and 46 are reversed, and the transfer paper on the endless belt 42 is conveyed, and the charging device 12 is driven by the closing of the normally open contact T-a5. operates, and the photoreceptor 11 is charged. The switch SW6 returns when the transfer 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 SV2 is actuated by the cam 55, the relay RAS is actuated to close its normally open contact RA6-al for self-holding, and also to close the normally open contact RA6-a2, R.
A6-a3 is closed and normally open contact RA6-b is opened. By closing this normally open contact RA6-a2, the lamp 21 lights up, and by closing the normally open contact RA6-a3, the motor M3
rotates forward, the lamp and the optical system move in the direction of the arrow in the figure, and the image of the document on the second surface C of the document table 20 is exposed to 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 actuating piece 24 starts at the same time and the switch 5II111 closes. When the lamp 21 and the optical system move to expose the original image up to the setting line E set by the copy size setting piece 22, the actuating piece 24 turns on the switch 5W.
12 is activated and relay RAS is restored. Therefore, when the lamp 21 goes out, the motor M3 reverses, the lamp 21 and the optical system return, and the switch 5V12 returns to its original state. When the lamp 21 = 15- and the optical system come to the original normal position, the switch 5w11 is opened by the operating piece 24, and the motor old stops, and the lamp 2
1 and the optical system stops. Thereafter, the switch SW3 is closed by the cam 55, but the solenoid 5OL4 is not activated and the transfer paper is not fed. Next, when the switch 5III4 is actuated by the cam 55, the relay RAS is actuated to close its normally open contact RA5-al for self-holding, and close its normally open contact RA5-a2. This normally open contact RA5-a
2 closes, the clutch CL3 operates and the endless belt 4
2.46 restarts the reversal. Therefore, the endless belt 46
The upper transfer paper 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, the transfer paper is copied on both sides, and is separated from the photoreceptor 11 by the separation claw 18 and placed on the guide plate 49.50.
The image is guided by an endless belt 51 and is conveyed by an endless belt 51, and is fixed by a fixing device 54 during the conveyance.

The fixed transfer paper is discharged onto the paper discharge tray, and at this time the switch Sv8 is activated. 1/-RA3, RA4, timer T by the operation of this switch Sv8.

Relays RA5 and RA7 return, solenoid 5OLI returns, and transfer roller 30 is separated from photoreceptor 11 and clutch CL3 is released.
returns and the endless belts 42, 46 stop. Then, the motor M4 reverses and the document table 2.0 returns to its original position. When the document table 20 returns to its original normal position, the switch SV9 is opened by the operating piece 23, the motor M4 stops, and the document table 20 returns to its original position. Stop. The transfer paper ejected to the paper output tray is placed on document tray 2.
The images of the original on the first side B and the second side C at 0 are copied on both sides, and the sizes of the copies on both sides are equal to each other and can be arbitrarily set by the copy size setting piece 22.

(Effects) As described above, according to the electrophotographic copying apparatus according to the present invention, two
Since multiple originals can be placed on the document table at one time and copied, copying can be carried out efficiently.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing an embodiment of a photocopying apparatus according to the present invention, FIG. 2 is a block diagram showing a part of an exposure device in the same embodiment, and FIGS. The figure is a circuit diagram showing the electrical system in the above embodiment. DESCRIPTION OF SYMBOLS 11... Photoreceptor, 12... Charging device, 13... Exposure device, 14... Developing device, 15... Transfer device, 1
6... Separation device, 17... Transfer device, 18... Separation device, 20... Document table, 21... Lamp, 23.
24... Operating piece, 5li19-5V12... Switch, 31... Paper feeding device, 45.54... Fixing device. 19-

Claims (1)

[Claims] A document table on which originals can be placed side by side on the first and second surfaces, and exposure in which each document on the first and second surfaces of the document table is individually scanned and exposed to light on a photoreceptor to form a latent image. a means for developing each latent image formed on the photoreceptor by the exposure means and transferring it to one side of the transfer paper; and a control means for selectively copying each original on the first side and the second side and copying the original on the first side by setting the means. Photocopying equipment.