JPS6238699B2 - - Google Patents

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 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 device 15, a separation device 16, a transfer device 17, and a separation device. 18 and cleaning device 19 are sequentially arranged along the rotation direction. As shown in FIG.
The image of the object to be copied, that is, the document placed on one of the surface B and the second surface C, is sequentially exposed onto the photoreceptor 11 through a slit, and the lamp 21
While moving a scanning system consisting of a movable optical system, the document table 20 is located within a length range from the reference line D to the setting line E formed by the copy size setting piece 22 with a predetermined width.
The images of the upper original are sequentially exposed.
Switches SW9 and SW11 are arranged on the reference line D, and switches SW10 and SW12 are 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 the switches SW9 and SW10 are
An actuating piece 23 for actuating is fixed integrally in correspondence with the reference line A. Switch SW11, SW
The operating piece 24 for operating the lamp 21
The actuating piece 24 is normally located on the reference line D. Also, transfer device 1
5 is constructed using a transfer roller 25, and this 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 attached to one end of a lever 26, the lever 26 is pivotally supported at the center, and the other end is connected to the solenoid SOL2 via a spring 27.
A return spring 28 is connected to the movable shaft of the movable member and is mounted between the fixed member and the fixed member. When the solenoid SOL2 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 SOL2 is activated, the lever 26 is rotated by the solenoid SOL2. 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 30 like the transfer device 15, and the transfer roller 30 is brought into pressure contact with the photoreceptor 11 when the solenoid SOL1 is activated. Further, a charger may be used in place of the transfer roller to perform the transfer. Transfer roller 25
A transfer paper 32 is fed between the photoconductor 11 and the photoreceptor 11 from a paper feeding device 31, 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 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 SOL4 via a spring 36, and a spring 37 is attached between the lever 35 and the stationary member. When the solenoid SOL4 is not operating, the roller 34 is rotated by the return spring 37 until the lever 35 hits the stopper 38, and the roller 34 is rotated until the lever 35 hits the stopper 38.
When the lever 35 moves away from the spring 37 and the solenoid SOL4 is activated, the lever 35 is moved by the spring 37.
The roller 33 rotates against the pressure and comes into pressure contact with the roller 33. Transfer paper 32 is transferred one by one from the paper feed table to rollers 33 and 3.
4, and when the roller 34 comes into pressure contact with the roller 33, the rollers 33 and 34 press the photoreceptor 1.
1 and the transfer roller 25. The separation device 16 uses a separation claw, and the transfer paper separated from the photoreceptor 11 by the separation claw is transferred to guide plates 39, 40.
and is fed into the endless belt 42 by the guide piece 41. The endless belt 42 has rollers 43, 4
4, and is designed to be 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 42 is fixed by this fixing device 45. There is a switch SW6 on the path where the transfer paper is fixed on the fixing device 45 and conveyed by the forward rotation of the endless belt 42,
A pair of rollers 5 that are constantly rotating are located outside of 4.
7 and 58, and a switch SW7 is disposed outside of these switches SW6 and SW7 are activated in the case of single-sided copying, and only switch SW6 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 SW5 is disposed on the path along which the transfer paper is conveyed by the endless belt 46.
5 is operated by transfer paper. The separating device 18 uses a separating claw, and the transfer paper separated by the separating claw 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 the fixing device 5 is placed above it.
4 is placed. A switch SW8 is arranged between the fixing device 54 and the paper ejection port.
SW8 is activated by transfer paper. Also, the cam 55 connects the photoreceptor 1 via the clutch CL1 and the gear mechanism 56.
1, and a switch SW1 is connected to the cam 55.
~SW4 is placed.

Now, if terminals B1 and B2 are connected to an AC power source and main switch MS is closed, the output of the AC power source is applied between terminals B3 and B4 via fuse F, and the fixing devices 45 and 54 and motor M1 is supplied with power and becomes operational, the developing device 14 and the cleaning device 19 are brought into operation by the motor M1, and the photoreceptor 11 is rotationally driven, and the timer T1 is activated.
is powered.

When single-sided print switch SSW is closed in this state, relay RA2 is activated and its normally open contact RA2
- Close a1 to maintain self-holding and set to normally open.
Close RA2-a2, RA2-a3 and normally open contact RA
2-b1 to RA2-b3 are opened. Relay RA1
is actuated by the closing of the normally open contact RA2-a2, which closes the normally open contact RA1-a1 for self-holding, and also closes the normally open contacts RA1-a2 to RA1-a5. Closing of this normally open contact RA1-a2 activates relay RA4, which closes its normally open setting RA4-a1 and maintains itself, and the normally open contact RA4-a
2. Close RA4-a3. This normally open contact RA4
-Solenoids SOL2 and SOL3 are activated by closing a3.
is operated, the transfer roller 25 is brought into pressure contact with the photoreceptor 11, and the separation claw 16 is brought into contact with the photoreceptor. Also, by closing the normally open contacts RA1-a4, the clutch CL2
operates to rotate the endless belt 42 in the forward direction, and the charging device 1
When normally open contacts RA1-a5 are closed, power is supplied to actuate the photoreceptor 11, and the photoreceptor 11 is charged. Clutch CL1 is actuated by the closing of normally open contacts RA1-a3, and cam 55 is rotationally driven. Switch SW
1 is closed when the cam 55 rotates from the normal position. After that, when switch SW2 is closed by cam 55, relay RA6 operates to close its normally open contact RA6-a1 and maintain itself, and also closes normally open contacts RA6-a2 and RA6-a3. Open normally open contact RA6-b. This normally open contact RA6-a
2 is closed, the lamp 21 lights up, and the normally open contact RA6-a3 is closed, causing the motor M3 to rotate forward, causing the lamp 21 and the optical system to move in the direction of the arrow in the figure, so that the lamp 21 lights up on the first surface B of the document table 20. The image of the original 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 start, the actuating piece 24 starts at the same time and the switch SW11 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 the switch SW12.
is activated and relay RA6 returns to normal. Therefore, the lamp 21 goes out, the motor M3 reverses, the lamp 21 and the optical system return, and the switch SW12 returns to its original state. In the case of one-sided copying, the switch SW13 is closed when the originals on the first side B and the second side C of the original platen 20 are alternately copied. Therefore, the switch
When SW13 is closed, switch SW12 is activated, relay RA7 is activated and its normally open contact is activated.
RA7-a1 is closed for self-holding, the normally open contact RA7-a2 is closed, and the normally open contact RA7-b is opened. 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. When the document table 20 moves, the actuating piece 2 simultaneously moves.
3 moves and switch SW9 closes. Original table 20
moves, and its reference line A becomes the copy size setting piece 22.
When the setting line E is reached, the switch SW10 is actuated by the operating piece 23, the motor M4 is stopped, and the document table 20 is stopped. When the lamp 24 and the optical system return to their original normal positions, the actuating piece 24 opens the switch SW11, stopping the motor M3 and turning the lamp 2 off.
1 and the optical system stops. Then switch SW3
is closed by the cam 55, the solenoid
SOL4 operates and the transfer paper 32 is transferred to 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 guide plates 39 and 40, fed to the endless belt 42 by the guide piece 41, and conveyed by the endless belt 42. During the conveyance, the toner is fixed by the fixing device 45. be done. When the switch SW6 is activated after this transfer paper is fixed by the fixing device 45, the relay RA1 is reset and the charging device 12 is deactivated, and the relay RA3 is activated and its normally open contact RA is activated.
3-A1 is closed and self-retained, and a normally open contact
Close RA3-a2, supply power to timer T, and open normally open contacts RA3-b1 and RA3-b2. By opening this normally open contact RA3-b2, the solenoid
SOL2 and SOL3 return to their original positions, and the transfer roller 25 and separation claw 16 separate from the photoreceptor 11. Fixing device 45
The fixed transfer paper is further conveyed and discharged to the paper discharge tray, but during this process, switch SW7 is activated, relays RA2 and RA4 are deactivated, power supply to timer T is stopped, and the electrical system is deactivated. 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. If the switch SW13 is closed, the timer T1 is turned off by the switch SW7.
Switch SSW until the set time of about seconds has elapsed.
When the opening is closed and exposure is performed in the next copying operation, the original on the second surface C of the original platen 20 is similarly copied. When the timer T1 turns on and its normally open contact T1-a returns, the relay RA7 returns, the motor M4 reverses, and the document table 20 returns to its original position. At this time, 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 SW13 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. Switch SW
13 is not closed, only the original on the first surface B of the original table 20 is copied.

Also, if the duplex print switch DSW is closed with the main switch MS closed, the relay RA
1 operates, and its normally open contact RA1-a1 is closed and self-holding, and the normally open contacts RA2-a2 to RA
2-Close a5. This normally open contact RA1-a2
When the relay RA4 is closed, the relay RA4 is activated, which closes its normally open contact RA4-a1 to hold itself, and also closes its normally open contacts RA4-a2 and RA4-a3. By closing this normally open contact RA4-a3, the solenoids SOL2 and SOL3 are actuated to transfer the transfer roller 2.
5 is brought into pressure contact with the photoreceptor 11, and at the same time, the separating claw 16 is brought into contact with the photoreceptor 11. In addition, normally open contact RA1
- Closing of a4 activates clutch CL2, causing the endless belt 42 to rotate forward. Also, normally open contact RA1-a
5 closes, the charging device 12 is supplied with power output and operates to charge the photoreceptor 11, and the normally open contact
Closing of RA1-a3 activates clutch CL1 and rotationally drives cam 55. The switch SW1 closes when the cam 55 rotates from the normal position. Thereafter, when switch SW2 is closed by cam 55, relay RA6 is activated and its normally open contact RA6-
Close a1 to maintain self-holding and normally open contact RA
Close 6-a2, RA6-a3 and normally open contact RA6-
Open b. By closing this normally open contact RA6-a2, the lamp 21 lights up, and the normally open contact RA6-a2 lights up.
- When a3 is closed, motor M3 rotates forward and lamp 2
1 and the optical system move, and the image of the document on the first surface B of the document table 20 is exposed to the photoreceptor 11, thereby forming an electrostatic latent image thereof. This electrostatic latent image is
4, the image is developed with toner. When the lamp 21 and the optical system start, the actuating piece 24 starts at the same time and the switch SW11 closes. When the lamp 21 and the optical system move to expose the line on the original up to the set line E set by the copy size setting piece 22, the switch SW12 is activated by the actuating piece 24, and the relay is activated.
RA6 returns. Therefore, the lamp 21 goes out, the motor M3 reverses, the lamp 21 and the optical system return, and the switch SW12 returns to its original state. When the lamp 21 and the optical system come to the original normal position, the switch SW11 is opened by the actuating piece 24, and the motor M
3 stops, the lamp 21 and the optical system stop.
Also, when switch SW12 is activated by actuating piece 24, relay RA7 is activated, and its normally open contact RA
7-A1 is closed and self-retained, and a normally open contact
Close RA7-a2 and open normally open contact RA7-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 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 SW10 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 SOL4 is activated and the transfer paper 32 is moved between the transfer roller 25 and the photoreceptor 11.
The transfer paper 32 is sent from the photoreceptor 11 to the
The toner is transferred to. The transfer paper is separated by the separation claw 16.
The guide plates 39, 40 are separated from the photoreceptor 11 by
The toner is guided by the guide piece 41 and fed 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 switch SW6, relay RA1 returns, charging device 12 returns, and the clutch is activated.
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-a1 is closed to hold itself, and the normally open contact RA3-a2 is closed to supply power to the timer T, and the normally open contact RA3-b1 is activated. ,RA3
-Open b2. By opening this normally open contact RA3-b2, the solenoids SOL2 and SOL3 return to their original positions, and the transfer roller 25 and separation claw 16 are separated 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~
Close T-a5 and open normally open contact T-b. By closing this normally open contact T-a2, the solenoid
SOL1 operates and the transfer roller 30 transfers to the photoreceptor 11.
By closing the normally open contact Ta3, the clutch CL1 continues to operate and the cam 55 continues to rotate. Furthermore, 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 when the normally open contact T-a5 is closed, the charging device 12 is operates, and the photoreceptor 11 is charged. Switch SW
6 returns when the transfer paper passes, and switch SW5
When actuated by the transfer paper, the clutch CL3 returns and the endless belts 42, 46 stop. Also, when switch SW2 is activated by cam 55, relay
RA6 operates and closes its normally open contact RA6-a1 to maintain its self-holding state, and the normally open contacts RA6-a2,
Close RA6-a3 and open normally open contact RA6-b. The closing of the normally open contact RA6-a2 turns on the lamp 21, and the closing of the normally open contact RA6-a3 causes the motor M3 to rotate forward, causing the lamp and the optical system to move in the direction of the arrow in the figure. The image of the document on the second side C 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 starts at the same time and the switch SW11 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 SW12 and restores relay RA6. Therefore, the lamp 21 goes out, the motor M3 reverses, the lamp 21 and the optical system return, and the switch SW12 returns to its original state. When the lamp 21 and the optical system come to the original normal position, the switch SW11 is opened by the operating piece 24, the motor M3 is stopped, and the lamp 21 and the optical system are stopped. Thereafter, the switch SW3 is closed by the cam 55, but the solenoid SOL4 is not activated and the transfer paper is not fed. Next, when switch SW4 is activated by cam 55, relay RA5 is activated and its normally open contact RA5-
Close a1 to maintain self-holding and normally open contact RA
5-Close a2. This normally open contact RA5-a2
When the clutch CL3 is closed, the clutch CL3 is activated and the endless belts 42 and 46 resume reverse rotation. 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 separating claw 18, guided by guide plates 49 and 50, and conveyed by the endless belt 51. During the conveyance, the transfer paper is transferred by the fixing device 54. It will be established. This fused transfer paper is ejected to the paper output tray, but at that time the switch
Activate SW8. By the operation of this switch SW8, relays RA3, RA4, timer T, relay
RA5 and RA7 are restored, solenoid SOL1 is restored, and the transfer roller 30 is separated from the photoreceptor 11 and the clutch is closed.
CL3 returns and the endless belts 42, 46 stop. Then, the motor M4 reverses and the document table 20 returns to its original position, and when the document table 20 returns to its original normal position, the switch SW9 is opened by the operating piece 23, the motor M4 stops, and the document table 20 stops. .
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, it is possible not only to copy two originals on two original document placement surfaces onto both sides of the transfer paper, but also to copy only on one side of the transfer paper. It is possible to copy not only the two sides of a three-dimensional object, but also the left and right pages of a book, etc., with the original placed on the document placement surface without having to change them.

[Brief explanation of the drawing]

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. FIG. 2 is a circuit diagram showing the system. DESCRIPTION OF SYMBOLS 11... Photoreceptor, 12... Charging device, 13... Exposure device, 14... Developing device, 15... Transfer device, 16... Separation device, 17... Transfer device, 18... Separation device, 20
... Original table, 21... Lamp, 22... Copy size setting piece, 23, 24... Operating piece, SW9 to SW12... Switch, 31... Paper feeding device, 45, 54... Fixing device.

Claims (1)

[Claims] 1 A document table on which originals can be placed side by side on the first and second sides, and the documents on the first and second sides of the document table are individually exposed to light on a photoreceptor to form a latent image. means for selectively giving a single-sided copy command and a double-sided copy command; and a means for selectively giving 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 transferring the images onto both sides of a sheet of transfer paper in response to the double-sided copy command.