JPS6063553A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To transfer a developed image formed separately on a photosensitive body by one surface of two sheets of copying paper in response to a one-surface copying command, and to both surfaces of one sheet of copying paper in response to a both-surface copying command, by giving selectively the one-surface copying command and the both-surface copying command. CONSTITUTION:In case of one surface copying, a motor rotates forward, a lamp 21 and a photoelectric system move in the direction as indicated with an arrow, an image of an original on the first surface B in an original placing plate 20 is exposed to a photosensitive body, and its electrostatic latent image is developed by a forming toner. In the same way, an image of an original on the second surface C is developed by the toner. In case of both-surface copying, the motor rotates in reverse, and when the original placing state 20 is returned to its original stationary position, a switch SW9 is opened by an operating piece 23, and the motor stops. The transfer paper is inverted and the same operation is repeated. As a result, as for the transfer paper discharged to a paper discharge plate, the image of the original on the first surface B and the second surface C in the original placing plate is transferred to both its surface. In case of one-surface copying, it is transferred to one surface of two sheets of copying paper.

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, electrophotographic copying devices have been used that copy only on one side of copy paper, and models that automatically copy on both sides of transfer paper have been proposed, but this is due to various technical issues. It has not been put into practical use yet due to problems.

(Objective) In view of the above-mentioned points, it is an object of the present invention to provide an electrophotographic copying apparatus that can arbitrarily perform double-sided copying and single-sided copying.

(Structure) The present invention includes a document table on which originals can be placed side by side on the first and second surfaces, and the documents on the first and second surfaces of the document table are individually exposed onto a photoreceptor to form a latent image. means for forming and developing the latent image into a developed image; means for selectively giving a single-sided copying command and a double-sided copying command; In response to the two-sided copying command, the image forming apparatus is provided with a means for transferring the information onto one side of two sheets of transfer paper, and in response to the double-sided copying command, transferring the image onto both sides of one sheet of transfer paper.

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 bag W15, a separating device 16, and a transfer device 1'.
17, a separation 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 using a slit, and while moving a scanning system consisting of a lamp 21 and a movable optical system, a setting line E is set by a copy size setting piece 22 from a 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 5IN9 is on the reference line.
5v11 is placed and switch 5IillO1S
W12 is disposed on the setting line E integrally with the copy size setting piece 22.

The original platen 20 is normally in the normal position shown in the figure where the reference lines A and D coincide, and the operating piece 23 for operating the switches SW9, 5IilIO is fixed integrally in correspondence with the reference line A. Switch 5INII! An operating piece 24 for operating V12 is integrally fixed to a scanning system such as a lamp 21,
This actuating piece 24 is normally located on the reference line.

Further, the transfer device 15 is configured using a transfer roller 25.

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 operating, the transfer roller 25 is moved to the lever 26 by the return spring 28.
rotates until it hits the stopper 29, and the photoreceptor 11
When the solenoid 5OL2 is activated, the lever 26 is rotated by the solenoid 5OL2 against the spring 28, and is brought into pressure contact with the photoreceptor 11.

The transfer device 17 is also configured using a transfer roller 30 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 between the transfer roller 25 and the photoreceptor 11 from a paper feed device 31, and this paper feed 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 connected 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 arranged on the endless belt 42, and the transfer paper conveyed by the endless belt 424- is fixed by this fixing device 45. Transfer paper is fixed to fixing device 4
There is a switch St/6 on the path fixed by 5 and conveyed by the normal rotation of the endless belt 42, and furthermore, there is a pair of rollers 57 and 58 which are constantly rotating outside the roller 44; A switch SV7 is disposed on the outside, and switches SW6 and SW7 are activated in the case of single-sided copying, and only switch SV6 is activated in the case of 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 piece 41 and send it between the photoreceptor 11 and the transfer roller 30. A switch SL) is arranged on the path along which the transfer paper is conveyed by the endless belt 46, and this switch Sv5 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 a roller 52
．． 53, and a fixing device 54 is disposed above it.

A switch Sv8 is arranged between the fixing device 54 and the paper discharge port, and this switch Sw8 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.
w1 to Sw4 are arranged.

Now, if we connect terminals B1 and B2 to the AC power source and close the main switch MS, the AC power source will come out from 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 RAG-a2, closes its normally open contact RAI-al, and maintains itself, and normally opens contacts RAI-a2 to RAI-a.
Close 5. The closing of this normally open contact RAI-a2 activates relay RA4, which closes its normally open setting RA4-at and maintains itself, and the normally open contacts RA4-a2, RA
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 Sv1 is cam 5
When 5 rotates from its normal position, it closes. Thereafter, when switch SV2 is closed by cam 55, relay RAS
operates to close its normally open contact RA6-al and maintain its self-holding, while also closing its normally open contacts RA6-a2 and RA6-B3 and opening its normally open contact RA6-b. This normally open contact RA
The lamp 21 lights up when the contact 6-a2 is closed, and the motor M3 rotates forward when the normally open contact RA6-a3 is closed, causing the lamp 21 and the optical system to move in the direction of the arrow shown in the figure, so that the first surface B of the document table 20 is turned on. The image of the upper document is exposed to light on the photoreceptor 11 to form 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 are started, the actuating piece 24 is started at the same time and the switch 5llll is closed. The lamp 21 and the optical system move to set the copy size setting piece 2.
When the image of the original is exposed up to the setting line E according to 2, the switch 5W12 is activated by the actuating piece 24, and the relay RA6 is activated.
will return. 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. In the case of single-sided copying, the first
Switch 51113 is closed when the originals on side B and second side C are to be copied alternately. Therefore the switch 5V
When 13 is closed, switch 5V12 is activated, and relay RA7 is activated to close its normally open contact RA7-al for self-holding, as well as to close normally open contact RA7-a2 and normally open contact RA7-b. Open. This normally open contact RA7
-a2 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 simultaneously moves and the switch SV9 closes. Original table 20
moves and when the reference line A reaches the setting line E formed by the copy size setting piece 22, the actuating piece 23 turns on the switch S%1.
10 is activated, motor M4 is stopped, and document table 20 is stopped. When the lamp 24 and the optical system come to the original normal position, the switch 5w is activated by the actuating piece 24.
11 opens, motor M3 stops, and lamp 21 and optical system stop. Thereafter, when the switch 5Ii13 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 the separating claw 16, guided by the guide plates 39 and 40, and sent to the endless belt 42 by the guide piece 41, and is conveyed by the endless belt 42. During the conveyance, the toner is fixed by the fixing device 45. be done.

After this transfer paper is fixed by the fixing device 45, switch S
When v6 is activated, relay RAI returns and the charged bag! 1
When relay 2 stops operating, relay RA3 operates and closes its normally open contact RA3-al to hold itself, and also closes its normally open contact RA3-a2 to supply power to timer T and normally open contact RA3-bl. , 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 separate from the photoreceptor 11. The transfer paper that has been fixed in the fixing bag [45] is further transported and discharged to the paper output tray, but in the middle of the process, the switch 5117 is activated, relays RA2 and RA4 are deactivated, the timer T stops power supply, and the electrical system is turned off. It will be canceled. 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. When the switch 5W13 is closed, if the switch SSv is closed and exposure for the next copying operation is performed before the set time of about 20 seconds has elapsed after the timer Tl was turned off by the switch SW7, the document is Second surface C of stand 20
The original above is copied in the same way. When timer 11 turns on and its normally open contact TI-a returns, relay RA7
returns, the motor M4 reverses, and the document table 20 returns to its original position. When the document table 20 returns to its original normal position, the actuating piece 23 opens the switch 5ll19, stops the motor M4, and the document table 20 returns to its original position. Stop. Therefore switch 5W
13 is closed, the first surface B on the document table 20
and the original on the second side C are alternately copied on one side. When the switch 51113 is not closed, only the original on the first side B of the original platen 20 is copied.

Also, when the double-sided print switch DSv 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 contact RAI-a4, the clutch CL2 is actuated to rotate the endless belt 42 in the forward direction. Furthermore, 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 CL1 is operated and the cam 55 is rotated. Driven. switch 5ti11
is closed when the cam 55 rotates from its normal position. Thereafter, when the switch 2 is closed by the cam 55, the relay RA611- is activated and closes its normally open contact RA6-al for self-holding, and also closes the normally open contacts RA6-a2 and RA6-a3. The normally open contact RA6-b is opened. This normally open contact RA
The lamp 21 lights up when the contact 6-a2 is closed, and the motor M3 rotates forward when the normally open contact RA6-a3 is closed, the lamp 21 and the optical system move, and the document on the first surface B of the document table 20 is turned on. The image is exposed to light on photoreceptor 11 to form an electrostatic latent image thereof. This electrostatic latent image is developed with toner by a developing device 14. When the lamp 21 and optical system start,
The actuating pieces 24 start at the same time and the switch 5lill closes. When the lamp 21 and the optical system move to expose the image of the original up to the setting line E defined by the copy size setting piece 22, the switch S12 is actuated by the operating 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 5W12 returns to its original state. When the lamp 21 and the optical system come to their normal positions, the switch 5v is activated by the first operating piece 24.
xi opens, motor M3 stops, and lamp 21 and optical system stop. Furthermore, when switch 5w12 is actuated by actuating piece 24, relay RA7 is actuated, closing its normally open contact RA7-al and self-holding, and closing its normally open contact RA7-a2 to maintain its normally open contact. R
Open A7-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 SV9 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 5w1o is actuated by the actuation piece 23, and the motor M is activated.
4 stops, and the document table 20 stops. Then switch S
When w3 is activated by cam 55, solenoid 5OL4
is activated, 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 1 by the separating claw 16.
Guide piece 41 separated from 1 and guided by guide plates 39 and 40
The toner is sent to the endless belt 42 and conveyed by the endless belt 42, and the toner is fixed by the fixing device 45 during the conveyance. When the transfer paper activates the switch Sv6, 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 its normally open contact RA3-al is closed to maintain the self-holding state, and the normally open contact RA3-a2 is closed to supply power to the timer T, and the normally open contact ftA3- is activated. b1. Open RA3-b2. 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 passes switch SV4 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 to T-a5 are activated.
is closed and the normally open contact T-b is opened. This normally open contact T-
Closing of contact a2 activates solenoid 5OLI to press transfer roller 30 against photoreceptor 11, and closing of normally open contact Ta3 causes clutch CLI to continue to operate and cam 55 to continue rotating. In addition, 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 normally open contact T-a4 is closed.
By closing a5, the charging device 12 is activated and the photoreceptor 11 is charged. The switch 5I116 returns when the transfer paper passes, and when the switch SV5 is actuated by the transfer paper, the clutch CL3 returns and the endless belts 42, 46 stop. Also, when switch 5III2 is actuated by cam 55, relay RA6 is actuated and its normally open contact RA6-al
Closes and self-retains, and normally open contact RA6-a2,
RA6-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 M
3 rotates in the normal direction, the lamp and the optical system move in the direction of the arrow shown 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 5v11 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 switch S%1 is activated by the 1 operation piece 24.
12 is activated and 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 5V12 returns to its original state. When the lamp 21 and the optical system come to the original steady position, the actuating piece 24
As a result, the switch 5WII is opened, the motor M3 is stopped, and the lamp 21 and the optical system are stopped. Then switch Sυ3
is closed by the cam 55, but the solenoid 5OL4 is not activated and the transfer paper is not fed. Next, when the switch S4 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-a2
, the clutch CL3 is activated and the endless belt 42 is closed.
．． 46 resumes the reversal. Therefore, the transfer paper 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, the transfer paper is copied on both sides, is separated from the photoreceptor 11 by the separation claw 18, guided by the guide plates 49, 50, and conveyed by the endless belt 51. During the conveyance, the transfer paper is fixed by the fixing device 54. be done.

The fixed transfer paper is discharged onto the paper discharge tray, and at this time the switch Sw8 is activated. This switch svg (
7) Relay RA3. RA4, Thai V-T.

Relays RA5 and RA7 return, solenoid 5OLI returns, and transfer roller 30 separates from photoreceptor 11 and clutch C
L3 returns and the endless belts 42, 46 stop. When the motor M4 is rotated in the reverse direction and the document table 20 is returned to its original position, the actuating piece 23 is activated.
As a result, switch SV9 is opened, motor M4 is stopped, and document table 20 is stopped. The image of the original on the first side B and the second side C on the document table 20 is copied on both sides of the transfer paper discharged to the paper output table, and the sizes of the copies on both sides are equal to each other, and the copy size setting piece 22 It can be set arbitrarily.

(Effects) As described above, according to the electrophotographic copying apparatus according to the present invention, two
It is possible to copy two originals on both sides of the transfer paper, and it is also possible to copy only one side of the transfer paper, and it is possible to exchange not only the two sides of three-dimensional objects but also the left and right pages of books, etc. Copies can be made while the document is placed on the original surface.

[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, 22...
...Copy size setting piece, 23.24...Operating piece, SW
9-5W12...Switch, 31...Paper feeder, 4
5, 54... Fixing device. 19-

Claims (1)

[Claims] There is a document table on which originals can be placed side by side on the first and second surfaces, and the documents on the first and second surfaces of the document table are individually exposed to light on a photoreceptor to form a latent image. means for developing a visualized image; means for selectively giving a single-sided copy command and a double-sided copy command; and a means for selectively applying a single-sided copy command and a double-sided copy command; An electrophotographic copying apparatus comprising means for transferring images onto one side of a sheet of transfer paper and, in response to the double-sided copy command, transferring the images onto both sides of a sheet of transfer paper.