JPS61249794A - Picture forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus capable of copying an image drawn on a blackboard and copying a manuscript.

[Traditional technique]

Conventionally, characters, nine figures, etc. written on a blackboard at meetings, lectures, etc. were transcribed into notebooks. However, in order to prevent trouble and errors during transcription, a copying device that can directly copy characters written on a blackboard has been proposed.

This type of device consists of a blackboard section and a copying section.
The copying section is a device that can also make normal original copies; when copying the original, the copying section is moved forward, and when copying the image on the blackboard, the copying section is moved to the rear.

[Problems with conventional technology]

If copying is performed with this device without the copying section moving completely forward or backward, the light containing the image information will not completely enter the exposure port on the copying section, which will be described later, when copying an image on the blackboard. Therefore, the image cannot be accurately copied. In addition, not only will normal copies not be obtained, but the copies will be completely black, which wastes toner.
This will place an extra load on the cleaner device, etc. Also.

If the copying operation is stopped at that point, the paper being copied will remain in the machine, causing a jam and causing trouble.

[Purpose of the invention]

In view of the above conventional drawbacks, the present invention provides an image forming apparatus for copying an image drawn on a blackboard, which prevents solid black copying and obtains a normal copied image when copying an image on a blackboard. At the same time, the objective is to provide an image forming apparatus that consumes less toner.

[Key points of the invention]

In order to achieve the above object, the present invention includes a display section having a writable and erasable display surface, and a display section that is detachable from the display section and placed on the display surface and a document table to selectively copy an original document. In the image forming apparatus, the copying section produces an electrostatic latent image corresponding to the display surface or original.

The photoreceptor to be formed, a static eliminating means for removing unnecessary charges on the display surface of the photoreceptor, and a detection means for confirming the movement of the copying section, and during the copying operation of the display surface, the detection means The present invention is characterized in that when a mismatch between the display section and the copying section is detected, the static eliminator is activated to perform a copying operation.

[Embodiments of the invention]

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

FIGS. 2 and 3 are perspective views showing the overall configuration of an image forming apparatus according to an embodiment of the present invention. J shows the appearance of the copy on the board, and FIG. 3 shows the copy state of the original.

In the figure, one image forming apparatus is composed of a board section l and a copying section 2, where the board section 1 includes a frame la, a board sheet 3. It consists of an operating section 4, and has a board optical system and a winding device inside. The copying section 2 is provided with a document table 2a including a document cover on the upper part thereof, and is attached to a moving rail "2" to be described later and is configured to be movable back and forth.

When copying an original placed under the original cover, move the copying section 2 forward as shown in Fig. 3, and when copying an image on the board sheet 3, move the copying section 2 forward as shown in Fig. 2. 2 is retracted and used later.

When copying the image on the board sheet 3, the board sheet 3 is moved by being wound around a take-up roller within the frame la, the image on the moving board sheet 3 is irradiated with light, and the reflected light is The light path is configured to enter through an exposure aperture at a predetermined position within the copying section 2.

The original table 2a on the upper part of the copying section 2 is composed of an original glass, a document cover, etc., and the original table 2a moves back and forth in the direction of the arrow when copying an original.

FIG. 1 (81, fb) is a right side view of the above-mentioned image forming apparatus. Figure 1 (b
1 is the state in which the copying section 2 is fully extended forward, that is, the state shown in FIG.

In addition, in FIG. 1 (al, (bl), the frame 1a is omitted to make it easier to explain the movement of the copying unit 2.
al, (in bl, the fixed rail 6 is fixed to the board part 1 by a mechanism not shown, and the fixed rail 6 is provided with four rotatable rollers 7 on the upper and lower sides.The movable rail 8 is It is configured to be slidable on a fixed rail 6 via rollers 7, and a magnet 9 is attached to the rear end of the lower surface of the movable rail 8.On the other hand, two reed switches are mounted on the upper surface of each unit 5. ioa, 10b are installed,
The installation position of the reed switch 10a is as shown in Figure 1 f above.
When the copying unit 2 reaches the position shown in a), the position of the stand 5 is directly below the position where the magnet 9 on the lower surface of the moving rail 8 moves and stops, and the reed switch 10b is installed at the position shown in FIG.

When the copying unit 2 reaches the position shown in the above-mentioned figure [b].

This is the position of the stand 5 directly below the position where the magnet 9 has moved and stopped.

In other words, the reed switch 10a is provided directly below the magnet 9 when the board is in a normal state of copying, and the reed switch 10b is provided directly below the magnet 9 when the original is in a normal state of copying. There is. This reed switch 10
The magnets a and 10b are turned on when the magnet 9 is positioned directly above each magnet, and output a control signal for a copying operation, which will be described later.

FIG. 4 is a diagram showing the internal configuration of the copying section 2. As shown in FIG. When copying an original placed on a normal original glass 27 (not shown), the original is irradiated with light from the light source 27a, and the light reflected from the original is transferred to the first copying mirror 27b. The photosensitive surface 12 of the photosensitive drum 11 is irradiated (exposed) via the copying lens 27c and the second copying mirror 27d. At this time, the photosensitive surface 12 has been given a uniform electric charge in advance by the charger 13, the non-image portion is neutralized by the static elimination lamp 14, and an electrostatic latent image is formed on the photosensitive surface 12 by the above-mentioned exposure. Ru. The electrostatic latent image formed on the photosensitive surface 12 is visualized by the developing device 16 and becomes a toner image, which is transferred to the transfer device ]'N
At this point, the paper feed roller 19. The image is transferred onto the transfer paper sent via the standby roller 20. Transfer paper”
After the second toner image is thermally fixed by a fixing device 21, it is discharged to the outside of the machine by a paper discharge roller 22. On the other hand, residual l/toner on the photosensitive surface 12 that was not completely transferred by the transfer device 17 is removed by a cleaner 23, and the photosensitive surface 12 is removed in preparation for the next exposure.
A uniform electric charge is applied to the charger 13 by the charger 13.

On the other hand, below the original glass 6, the housing 2b of the copying section 2 is provided with an exposure aperture 24 for board copying (hereinafter referred to as exposure aperture) and an exposure aperture 25 for original copying. A shutter 26 is provided to prevent light from entering the machine. Further, a standby switch 28 is provided on the Ill feeding path 30 for the transfer paper to confirm the passage of the transfer paper, and constantly confirms the passage of the transfer paper.

Next, the configuration of the board section 1 will be explained using FIG. 5. The winding device includes winding rollers 35, 36 . Feed roller 37a~
37d, etc., and to pick up the board sheet 3, the board sheet 3 that has been wound many times around the single winding roller 36 is wound onto the winding roller 35 via the feed rollers 37a to 37d, and the winding speed at this time is is carried out at a constant speed by a drive mechanism (not shown), and the second rewinding is carried out by winding up the first winding roller 36. Further, the board sheet 3 that has been taken up once forms a horizontal surface with respect to the frame 1a by the feed rollers 37c to 37d. Further, the board sheet 3 is also kept horizontal by a bank up board 38.

In addition, the blackboard optical system is fluorescent lamp 39. The first mirror 40, the second
Mirror 41. Light from a fluorescent lamp 39 is irradiated onto the board sheet 3, which is composed of a blackboard lens 42 and the like, and which is formed in a planar shape between the above-mentioned feed rollers 37a and 37b.

FIG. 6 shows the optical path of the reflected light 32 from the board sheet 3 when the light from the fluorescent lamp 39 is irradiated onto the board sheet 3 on which characters, two figures, etc. are drawn.

As shown in the figure, the number of reflected lights 32 is 4 for 2 reflected lights 32.
It is bent by 90 degrees by the first mirror 40 arranged at an angle of 5 degrees, and further bent by 90 degrees downward by the second mirror 41, and then passed through the blackboard lens 42 onto the photosensitive drum 11 in the copying section 2. exposed to light. or.

A shutter 26 located on the optical path of the reflected light 32. Original 4 draft glass 27. Copying lens 27C etc. is powered by power switch 48
For example, the shutter 26 has moved to the position shown by the dotted line, the document glass 27 has also moved to a position where it does not block the exposure aperture 24, and the blackboard lens 42 has moved to the position shown by the dotted line.
The reflected light 32 that has passed through can pass through an exposure opening 24 provided in the housing 2b and irradiate the photosensitive surface 12 with light.

Furthermore, the copying lens 9a is also moved to the same magnification position 27e indicated by the dotted line, where it does not block the optical path of the reflected light 32, and other optical systems such as mirrors do not block the optical path of the reflected light 32 when it is in a cold position. 1 reflected light 32 hits the photosensitive surface 12.
After being exposed to light, the image drawn on the 1'' sheet 3 is copied onto the transfer paper through the same steps as the above-described copying of the original, such as development, transfer, and cleaning.

Further, as shown in FIG. 7 on the board sheet 3.

A first page detection mark 43 is provided at one location on the top edge,
At the bottom end, there are page detection marks 44a at regular intervals m,
44b..., and timing marks 45a, 45b...
... are provided, and in this embodiment, the page detection mark is 44.
e (not shown), thus board sheet 3
This means that five pages are divided at the top. Mark sensors 46 and 41 are provided in the board section 1 at positions corresponding to the first page detection mark 43, page detection marks 44a, 44b to 44e, and timing marks 45a and 45b to 45e, respectively.

On the other hand, as shown in FIG. 8, the board operation section 4 is operated by a power switch 48. Each page instruction switch 4'92-49e, print switch 50. and a power lamp 51 that lights up when the power switch 48 is turned on. Each page instruction switch 492
~Page display lamp 52a that lights up when 49e is turned on
~52e and an alarm lamp 53.

The alarm lamp 53 lights up when the copying section 2 is detected by a detection means (not shown) that it is not in a position to copy the image on the storage sheet 3, and when there is no transfer paper or when the fixing device 21 has reached a predetermined temperature. Blinks when the copying conditions are not met, such as when there is no copy available.

Also, when the second power switch 48 is turned on, the mark sensor 46
does not detect the first page detection mark 43, the control mechanism drives the second take-up roller 36, and the mark sensor 4
G moves the board sheet 3 to a position where the first page detection mark 43 is detected.

The control circuit of the image forming apparatus having the above-mentioned mechanism is shown in FIG. The circuit of one example of the boat section includes a printed switch 50° on the board side, the above-mentioned reed switches 10a and 10b, and a resistor R+.

R2, R3, and a board control section 54, including a printed switch 50 on the board side. Reed switch 10a, 10b
One end is connected to the power supply (vcc), and the other end is each resistor R
1,' It is grounded via R2 and R3 and becomes G. Further, the connection point between the printed switch 50 and the resistor R3 on the board side, the connection point between the reed switch 10a and the resistor R2, and the connection point between the reed switch 10b and the resistor R1 are connected to the board control section 54.

On/off signals of each switch and sensor are input to the board control section 54. When the print switch 50 is pressed down, the signal applied to the board control unit 54 has the same voltage as the power supply VCC, and the board control unit 54 detects that the print switch has been pressed based on this voltage level.

Note that when the print switch 50 is not pressed down, the resistor R
3 to the ground voltage level or 0 leher.

Resistor R3 and resistors R1 and R2, which will be described later, are pull-down resistors for ensuring that the signal applied to board control section 54 is at O level. When the copying section 2 is in the normal position in the board copying state or original copying state, the respective reed switches 10a and 10b are turned on, and the same voltage as the power supply voltage cc is applied to the board control section 54. Board control section 5
4 detects this voltage level and detects that the copying section 2 is in the normal position. Furthermore, the output of the board control section 54 outputs control signals to the drive motors 55, 56, etc. of the winding rollers 35, 36 of the board sea L3.

On the other hand, the copying unit side circuit 2 includes a print switch 5 on the copying side.
7. Document platen limit switch 58. Standby switch 28.
It consists of resistors Ra, Ra, RE, a copy control section 59, a print switch 57 on the copy side, a document platen limit switch 58. One end of the standby switch 28 is connected to a power supply (Vce), and the other end is grounded via resistors Ra, R5, and R6, respectively. Also, the connection point between the print switch 57 and the resistor R5 on the copying side, the connection point between the document platen limit switch 58 and the resistor R5
The connection point between the standby switch 28 and the resistor R4 is connected to a copy control section 59, and on/off signals of each switch and sensor are input to the copy control section 59.

Print switch 57 on the copy side. Document platen limit switch 58. Each on/off state of the standby switch 28 is similar to the on/off state of the reed switches 10a, 10b described above, depending on the voltage level of the power supply ■cc and the ground level (0 level).
The signal is applied to the copy control section 59 as a signal. The copy control unit 59 detects the level change of these signals, and if the standby switch 28 is turned on, the transfer paper is transferred to the transport path 3 in FIG.
Detects that it is passing above 0. It also detects that the print switch 57 has been pressed and that the document table has moved to the end of its movement.

Furthermore, the output of the copy control unit 59 is transmitted to a copy drive motor 60. Clutch 61° Static elimination lamp 14
Outputs control signals to etc.

On the other hand, the board control section 54 and the copy control section 59 are connected to each other via an interface.

The same data is being input and output.

In the image forming apparatus of the present invention having the above configuration, when copying an image on the boat sheet 3, one copying section 2 is moved backward as described above, as shown in FIG. 10(a).

Processing is performed according to the flowchart shown in (b). However, although the figure (al) shows the processing flow of one example of the board section, and the same figure (b) shows the processing flow of two examples of the copying section, when copying an image on board sheet 3, Since the image processing flows are executed in relation to each other, step ST is used for the flow in the same figure (al), and step ST is used for the flow in the same figure (al).
will be explained using step S at the same time.

First, on the board section 1 side, it is determined whether the above-mentioned copying section 2 has been reliably moved to the rear, that is, whether it has been moved to the board copy position, based on a signal from the reed switch 10a (step ST+). This judgment (step ST+) is made by using the reed switch 10a as described above.
This is done by the signal level from. That is, when the reed switch 10a is off, the copying section 2 has not been moved to the board copy position (NO), so the above-mentioned operation continues until the normal position is detected.

The judgment (step S T + ) is repeated. Further, when the reed switch 10a is on, judgment 9 (step 5T)
1), it is detected that the board is in a normal board copying state (YES), so the board copying described later is performed only in this case.

The copying section is set to the copying position of board sheet 3 (Yes)
If so, it is determined whether the print switch 5o has been turned on (step ST2). print switch 5
If 0 is not on (NO), the process is repeated from IFr (step S T I) to determine whether the board copy position is present. If the print switch 50 is turned on,
The board control section 54 sends a board copy start signal (A) to the copy control section 59 (step 5T3), and waits for a board sheet drive signal, which will be described later.

On the other hand, the copying unit 2 determines whether or not there is a board copy start signal (A) (S, +), and determines whether there is a copy start signal.
This determination (S+) is repeated until the result is YES (if there is no copy start signal, the result is N and this determination S1 is performed again). The port copy start signal (A) is a signal indicating that the board control unit 54 detects further pressing of the print switch 50 at the normal copy position, and in response to this signal, the copying unit 2 executes processing to start a copy operation. When the board copy start signal is input, the judgment (SI) becomes that there is a board copy signal (YES), the drive motor 60 is driven, the high voltage output is turned on, the static elimination lamp 14 is lit,
Rotate the paper feed roller 19 and send the transfer paper onto the conveyance path (
Step S2). Thereafter, it is determined whether or not the standby switch 28 has been turned on for the transfer paper sent onto the IN feeding path (step S3). This judgment is repeated when it is not on (N). When the standby switch 28 is turned on (step S3 is YES), the static elimination lamp is turned off, and the power supply 26 is turned on.
is opened, and the board sheet drive signal (B) is output from the copying machine control section 59 to the board control section 54 (step Sa).
. The board control unit 54 determines that the board sheet drive signal is present based on the input of this board sheet drive signal (step ST4 is YES).

Drive the motor 55 to start moving the board sheet 3,
The exposure lamp 39 is turned on. Then mark sensor 47 marks timing marks 45a to j5e on board sheet 3.
When detected, a timing signal (C) is sent to the copy control section 59 (step ST5). When the copying section 2 receives the timing signal ('C), it determines that there is a timing signal (YES in step S5), drives the standby roll 2o (step S5), and moves the transfer paper toward the transfer device 17.
Two transfer papers sent by M! Transfer starts with conveyance.

On the board section 1 side, reed switch 1? during copying operation. Monitor the signal from a and check whether the copying unit 2 is at the board copy position or not.
Unfortunately, in step 5Ta), in the normal state at the board copy position (step ST6 is YES), the mark sensor 47 detects the page I extraction marks 44a to 44e, but in step 5TY), the page detection mark 44 is detected.
If one of a to 44e is detected, the board sheet 3 is stopped, the exposure lamp 39 is turned off (step 5Te), and an exposure=18- end signal is sent to the copying section 2 (step 5T9).
. Judgment whether it is the board copy position (step ST
6) is repeated until the page mark is detected, so 1
In judgment (step ST?), there is a page mark / J (
When the result is Y), the copying unit 1 does not move excessively during copying and the copying has been completed normally. Here, if the copying section 2 moves forward for some reason and deviates from the board copying position, the output of the reed switch 10a detects that the copying section 2 is not at the board copying position.Step S
If T6 is NO), the exposure lamp 39 is immediately turned off and an exposure end signal D' is sent to the copy control section 59 (step ST+o). After that, on the board section 1 side, when the mark sensor +47 detects one of the page detection marks 44a to 44e (YES in step ST'++), as described above,
Stop the movement of board sheet 3 (step 5TI2)
.

Therefore, as soon as it is confirmed by this reed switch 10a that the copying section 2 has moved, the exposure lamp 39 is turned off, and the board sheet 3 is subsequently moved, but since the boat sheet 3 is not irradiated with light, the copying Part 2
The photosensitive drum 11 is not irradiated with light from the exposure opening 24 .

On the other hand, while the transfer paper sent to the transfer device 17 side does not pass through the standby switch 28 (step S7 is NO), the copying unit 2 side does not judge whether a stuck jam is set or not (step S8). If it is not set, go to step Sho; if it is set.

It is determined whether the jam timer of the transfer paper has timed up (step S9), and if the jam timer is not time-amplified (step S9 is NO), the board control unit 5 described above
The exposure end signals (D) (D') from 4 are sent to the copy control section 59.
In order to check whether the exposure end signal has been input, it is determined whether the exposure end signal has been input (step S+o). Here, when the exposure end signals (D) (D') are not input (step 2, S+o is NO), the process returns to step S7 repeatedly and it is determined whether the standby switch 28 is turned off. Exposure end signal (D) (D
') is input (step S+o is YES), the shutter 26 is closed, the static elimination lamp 14 is turned on, and the jam timer is set (step S++), and it is determined whether the standby switch 28 is turned off again (step S?). On the other hand, within a predetermined time (timer setting time), the transfer paper reaches the standby sensor 28.
is not turned off (step S9 is YES).

Process the jam as if the transfer paper is jammed (Step 5)
15). Here, the above-mentioned timer setting time is set to a sufficiently long time, taking into consideration that the copying unit 2 moves during copying of the board sheet and the exposure end signal (D') is generated earlier than in the normal copying operation. ing. Furthermore, when exposure termination M, (D I ) occurs, the jam timer setting time may be set longer than during normal copying. Next, when it is determined that the standby switch 28 is off (
Step S7 is YES), the transfer is completed, so the high voltage output is turned off, the static elimination lamp 14 is turned off, the jam timer is cleared (step 312), and it is determined whether the transfer paper has been ejected (step 513). If it is determined that the paper has been ejected (step 313 is YES), the copying operation is completed by stopping the copying machine 0 (step 5et).

The image on the board sheet 3 is copied by the flow described above, but as described above (if the reed switch 10a is not turned on at the same time during copying, the board control
Since the copying section 2 performs the copying operation with the static elimination lamp 14 turned on without outputting a signal to drive the exposure lamp 39 via the copying section 2, no image is copied onto the ejected transfer paper.

As described above, in this embodiment, it is possible to perform the copying operation of the image on the board sheet 3 by detecting whether or not the copying section 2 has moved completely backward using the magnet 9 and the reed switch 10a. By copying the image on the board sheet 3 by the copying section 2 at a halfway position, the light containing the information of the image on the board sheet 3 is not completely incident on the board sheet 3 from a predetermined position inside the copying section 2. The problem of not being able to accurately copy images can be solved.

[Effects of the Invention] As described above in detail, according to the present invention, when copying an image on a board sheet, the copying unit does not move completely backward, and the copying is always performed normally. Images can be obtained. In addition, even if the copying section is moved while copying images from the cleaning sheet, the R light lamp is turned off, which prevents black copying, resulting in wasted toner and shortened cleaner life. Problems can be prevented from occurring.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the moving state of the copying section, which is the inventive section of the fan and fbH bookstores. FIGS. 2 and 3 are perspective views of the image forming apparatus of the present invention. FIG. 4 is a configuration diagram of the copying section. FIG. 5 is a configuration diagram of the board section. FIG. 6 is a configuration diagram illustrating the optical path within the board section. Figure 7 is a configuration diagram of the board sheet. FIG. 8 is a configuration diagram of the operating section. FIG. 9 is a circuit diagram of the image forming apparatus of the present invention. FIG. 10 is a flow chart diagram. 1... Board part. 2...Copying department. 3. ・Board sheet. 9...Magnet. 10a, 10b... Reed switch. 54... Board control unit. 5... ° Copy control section.

Claims (1)

[Claims] In an image forming apparatus that includes a display section having a writable and erasable display surface, and a display section that is removable from the display section and that selectively copies a document placed on the display surface and a document table, the copying section includes a , a photoconductor that forms an electrostatic latent image corresponding to the display surface or the original, a static eliminating device that removes unnecessary charges on the display surface of the photoconductor, and a detection device that confirms movement of the copying section. An image forming apparatus comprising: an image forming apparatus, wherein when the detecting means detects disengagement between the display section and the copying section during the copying operation of the display surface, the static eliminator is activated to perform the copying operation.