JPS6247681A - Image forming device - Google Patents

Abstract

PURPOSE:To copy even characters, a graphic form, etc., drawn on a blackboard by attaching and detaching an original support member equipped with a screen, etc. CONSTITUTION:When the screen part 62 of the detachable original support member is mounted on a copying machine 1, a taken-up screen 65 in scanned optically by an exposure lamp 66. Image light based upon the screen 65 as an original is passed through a mirror 97 and converged by a lens 74 to form an image on a photosensitive body through a mirror 99, etc. Therefore, when this screen is used as a blackboard, even characters, a graphic form, etc., drawn on the blackboard are copied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

[Technical Background of the Invention and Problems Therewith] Generally, an electronic copying machine has a function of copying an original image onto paper as is, or enlarging or reducing the original image and making a copy.

However, conventional copying machines can only copy original images placed on a document support member of the main body of the copying machine.

By the way, blackboards are often used in meetings and the like, and it would be extremely convenient if characters, figures, etc. written on the blackboard could be copied.

[Object of the invention J This invention has been made based on the above circumstances,
The purpose is to provide an image forming apparatus that can not only make normal copies but also copy characters, figures, etc. written on a blackboard.

[Summary of the Invention] The present invention provides, for example, a copying machine with a removably provided screen portion including a second document support member on which a document image can be directly written on itself like a blackboard, It is possible to copy the drawn image and the original image placed on the original supporting member of the main body of the copying machine.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 and 2 schematically show the configuration of an image forming apparatus according to the present invention. Reference numeral 1 denotes a copying machine, and a screen portion 61 is removably wrapped around the top of the copying machine 1. That is, holding parts 591 and 592 are provided on both sides of the upper part of the copying machine 1, and these holding parts 591 and 59
The screen portion 61 is inserted into the plurality of holding holes 59a provided in the
The leg portions 61a are fitted. Further, a screen portion 61 is provided on the right side holding portion 591 of the copying machine 1.
A window portion 67 is provided for guiding light corresponding to the image on the screen 65 supplied from the copy Ia1 into the interior of the copy Ia1. A glass 67a is provided inside the window 67 so as to be perpendicular to the optical axis of the incident light, for example, and this glass 67a prevents dust and the like from entering the inside of the copying machine 1.

The screen section 61 includes a screen unit 62 and an optical system unit 63.

A screen window 6 is provided in front of this screen unit 62.
4 is formed, and a screen 65, which is a second document support member, is provided inside thereof so as to be movable as shown by arrows b1 and b2 in the figure. Furthermore, an operation panel 90 is provided below the screen window 64.

FIG. 3 shows the configuration of the operation panel 90. 901 is a copy key that commands the start of copying a screen image; 902 is a right movement key that moves the screen 65 to the right and winds it up by a predetermined length; and 903 is a key that moves the screen 65 to the left by a predetermined length. This is the left movement key for winding.

FIG. 4 schematically shows the configuration of the copying machine 1. On the top surface of the copying machine 1, there is a document table (transparent glass) 2 which is the first document support member that supports the document. is fixed. The document table 2 is provided with a fixed scale 21 that serves as a reference for setting the document. The original placed on the original table 2 is exposed to an exposure lamp 4 and a mirror 5.
．． By reciprocating the optical system 6.7 in the direction of the arrow a along the lower surface of the document table 2, exposure scanning is performed during the reciprocation. In this case, mirror 6.7 moves at half the speed of mirror 5 so as to maintain the optical exposure length. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirror 5.6.7 and then passes through the variable magnification lens block 8, which will be further described later. The light is reflected by a rotatably provided mirror 9 and guided to the photoreceptor drum 1o, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by the charging device 11, and then the image is exposed to slit light, thereby forming an electrostatic latent image on the surface. This electrostatic latent image is made visible by applying toner by the developing device 12.

On the other hand, the paper (material to be transferred) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery roller 15 or 16, passes through the paper guide path 17 or 18, and then passes through the registration roller pair. The registration roller pair 19 sends the image to the transfer section. Here, the paper feed cassette 1
3.14 is removably provided at the lower right end of the copy tj11, and either one can be selected on the operation panel described later. The cassette size of each of the paper feed cassettes 13 and 14 is detected by a cassette size detection switch 601 and 602, respectively. This cassette size detection switch 601.6
02 is turned on depending on the insertion of a cassette of a different size.
It consists of multiple microswitches that are turned off.

The paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 20. . This transferred paper P is transferred to the peeling charger 2
1, it is electrostatically separated from the photosensitive drum 10 and conveyed by the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the end of the conveyor belt 22, and by passing therethrough, the transferred image is is established. After fixing, the paper P is transferred to a tray 2 outside the copying machine 1 by a pair of paper ejection rollers 24.
It is designed to be discharged at 5.

Further, the photosensitive drum 10 after the transfer is transferred to a charger 26 for snow removal.
After the static electricity is removed by the cleaner 27, residual toner on the surface is removed, and the afterimage is roughly erased by the static electricity removal lamp 28, thereby returning to the initial state. Note that 29 is a cooling fan for preventing the temperature inside the copying machine 1 from rising.

FIG. 5 shows an operation panel 30 provided on the copying machine 1. As shown in FIG. 30s is a copy key for commanding the start of copying, 3
02 is a numeric keypad for setting the number of copies, etc.; 303 is a display unit that displays the operating status of each part, paper jam, etc.; 30
4 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 30s is a cassette display section for displaying the selected cassette; 306 is a magnification setting key for setting the copy enlargement and reduction magnification in a predetermined relationship; 307 is a zoom key for steplessly setting the enlargement/reduction magnification, 30a is a display section for displaying the set magnification, and 3C)+ is a density setting section for setting the copy density.

FIG. 6 shows an example of the drive source configuration of each drive unit of the copying machine 1 configured as described above, and is configured with the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the lens block 8 for changing the magnification. A mirror motor 32 is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification.

A scanning motor 33 is a motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for scanning the original. A shutter motor 34 is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming.

A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like. A drum motor 36 is a motor for driving the photosensitive drum 10. A fixing motor 37 is a motor for driving the paper transport path 22, the pair of fixing rollers 23, and the pair of paper discharge rollers 24.

Reference numeral 38 denotes a paper feed motor, which is a motor for driving the above-mentioned delivery rollers 15 and 16. 39 is a paper feed motor;
This is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 7 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by a first carriage 411, and the mirror 6.7 is supported by a second carriage 412, and these carriages 41 and 412 are guided by guide rails 421 and 422 in the direction of arrow a. It can be moved freely in parallel. That is, the four-phase pulse motor 33 for scanning drives the pulley 43. An endless belt 45 is stretched between the pulley 43 and the fiddle pulley 44, and one end of a first carriage 411 that supports the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, two pulleys 47.47 are rotatably provided on the guide portion 46 of the second carriage 412 that supports the mirror 6.7, spaced apart by 11 in the axial direction of the rail 422. A wire 48 is stretched between them. One end of this wire 48 is fixed to a fixing part 49, and the other end is fixed to the fixing part 49 via a coil spring 5°. In addition, the wire 4
One end of a first carriage 411 is fixed to the middle part of 8. Therefore, as the pulse motor 33 rotates, the belt 45 rotates, the first carriage 411 moves, and the second carriage 412 also moves accordingly. At this time, since the pulleys 47 and 47 serve as movable pulleys, the second carriage 41
2 move in the same direction at 1/2 the speed. Furthermore, first,
The direction of movement of the second carriages 411 and 412 is controlled by switching the direction of rotation of the pulse motor 33.

Further, a rotating shaft of, for example, a rotary solenoid 68 is attached to the base end of the mirror 9, and the mirror 9 is rotated by the rotary solenoid 68 as required.

Furthermore, on the document table 2, a specified sheet of paper (P
x, Py) and the copy magnification specified by the magnification setting keys 30s and 307 is K, then the copyable range (x, Py) is
y) becomes X-PX/K V-PV/. Of this copyable range (x, y), the X direction is indicated by the pointers 51 and 52 provided on the back of the document table 2, and the X direction is indicated by the scale 53 provided on the upper surface of the first carriage 411. It is now displayed by.

As shown in FIG. 8, the above-mentioned pointers 51 and 52
．． 55 via a spring 56. The pulley 55 is connected to the motor 5
This motor 5
8 is rotated according to the paper size and magnification, so that the distance between the hands 51 and 52 can be changed.

Further, the first carriage 411 is moved to a predetermined position @ (home position according to the magnification) by driving the motor 33 according to the paper size and magnification. Then, when the copy key 301 is pressed, the first carriage 411 first transfers to the second carriage 412.
After that, the lamp 4 is turned on and the second carriage 412 is moved away from the second carriage 412 . When scanning of the original is completed, the lamp 4 is turned off and the first carriage 4
11 is returned to the home position.

FIG. 9 shows the overall control circuit, which is mainly composed of a main processor group 71 and first and second sub-processor groups 72 and 73. The main processor group 71 is
A high-voltage transformer 76 that detects inputs from the operation panel 30 and input devices 75 such as various switches and sensors, such as the cassette size detection switches 60s and 602, and drives the various chargers, the static elimination lamp 28, and the cleaner 27. The blade solenoid 27a, the heater 23a of the pair of fixing rollers 23, the exposure lamp 4, the motors 31 to 40.58, etc. are controlled to perform the above-described copying operation.

Among the above motors 31 to 40.58, motor 35.37
．． 40 and the toner motor 77 that supplies toner to the developing device 12 is controlled by the main processor group 71 via a motor driver 78, and the motors 31 to 34 are controlled by the first sub processor group 72 via seven pulse motor drivers. The motors 36, 38, 39, and 58 are controlled by the second sub-processor group 73 via the pulse motor driver 80. Further, the exposure lamp 4 is controlled by the main processor group 71 via the lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via the heater control section 82. And main processor group 71
commands to drive and stop each motor are sent to the first and second sub-processor groups 72.73, and instructions to drive and stop each motor are sent from the first and second sub-processor groups 72.73 to the main processor group 71. A status signal indicating the status is sent.

The first sub-processor group 72 also includes motors 31 to 3.
Position information from a position sensor 83 that detects each initial position of 4 is input.

Furthermore, an operation panel 90 provided on the screen section 61, a pulse motor driver 69, a lamp regulator 70, and a rotary solenoid 68 for driving the mirror 9 are connected to the main processor group 71. The pulse motor driver 69 includes pulse motors 84 and 85 that move the screen 65, which will be described later.
is connected, and the screen 6 is connected to the lamp regulator 70.
An exposure lamp 66 is connected to 5 to irradiate light.

FIG. 10 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which detects the human power of keys on the operation panel 30 and controls various displays through an input/output board 92. Also, microcomputer 91
is expanded by input/output ports 93-96.

A high voltage transformer 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93, and a size switch for detecting paper size and other human power are connected to the input/output boat 94.
A copying condition setting switch and other human power are connected to the input/output boat 95.

For example, the input/output boat 96 detects the human power of the keys on the operation panel 9o, and controls the motor, exposure lamp, etc. corresponding to the human power of the keys.

FIG. 11 shows an example of the configuration of the first sub-processor group 72. That is, 101 is a microcomputer, which is connected to the main processor group 71. 102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and by setting a setting value from the microcomputer 101, it counts based on the setting value,
When the count is out, a termination pulse is output to the interrupt line of the microcomputer 101. A reference clock pulse is input to the timer 102. Also, microcomputer 101
, to which position information from the position sensor 83 is input, and input/output boats 103 and 104 are connected. The input/output boat 104 is connected to the motors 31 to 34 via the pulse motor driver 79. The input/output board 103 is used, for example, to output status signals of each pulse motor to the main processor group 71.

FIG. 12 shows the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71. Numeral 112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set by the microcomputer 111, it counts based on the set value, and outputs an end pulse when the count is out. This termination signal is latched by a latch circuit 113, and its output is supplied to the interrupt line and input/output board input line of the microcomputer 111. Also, an input/output board 114 is connected to the microcomputer 111, and this input/output port 114 is connected to the microcomputer 111. The motor 36.3 is connected to the output boat 114 via the pulse motor driver 80.
8.39.58 is connected.

Figure 13 shows the control circuit of the pulse motor, and shows the input/output boat 121 (input/output boat 1 in Figures 11 and 12).
04.114) has a pulse motor driver 122
A pulse motor driver 123 (corresponding to the pulse motor driver 79.80 in FIG. 9) is connected to this pulse motor driver 122 (corresponding to the pulse motor driver 79.
．． 39) are connected to each other.

Figure 14 shows the speed control method of a pulse motor.
Figure (a) shows the speed curve of the pulse motor, and Figure (b) shows the speed curve of the pulse motor.
) indicates the phase switching interval. As is clear from this figure, the phase switching interval is initially long, gradually shortens, eventually becomes equal, becomes gradually longer again, and then stops. That is, this indicates the slew-up and slew-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. In addition, ti, t2
...tx indicates the time of the phase switching interval.

Next, the screen portion 61 will be further explained.

15 and 16 schematically explain the configurations of the screen unit 62 and optical system unit 63 of the screen section 61.

In the screen unit 62, the screen 65
Both ends of are wound around winding cores 86 and 87, respectively.

These winding cores 86.87 have gears 861.871, respectively.
These gears 86r and 871 are provided with gears 841 and 851 rotated by motors 84 and 85.
are engaged. Then, by driving the motors 84 and 85, the screen 65 is moved by the arrow b shown in the figure.
It is designed to be moved in the 1 and b2 directions.

Further, inside the optical system unit 63, for example, a first
As shown in FIGS. 7, 18 and 19, the exposure lamp 66, lens 74 and mirror 97.98.99.1
00 is set. The exposure lamp 66 and mirror 97 are provided along the width of the screen 65 in the vicinity of the winding core 86 of the screen 65, as shown in FIGS. 15 and 18. Light generated from the exposure lamp 66 is irradiated onto the surface of the screen 65 wound around the winding core 86. This reflected light from the screen 65 is
The light is reflected by the mirror 97 and guided to the lens 74. The reflected light guided by this lens 74 is reflected by mirrors 98, 99 and 100, and is reduced to a size corresponding to the transfer paper P. is guided into the interior of the copying machine 1 through a glass 67a provided in a window 67.

Next, the operation in the above configuration will be explained. That is, when the left movement key 903 of the operation panel 9o provided on the screen section 61 is operated, the pulse motor driver 69 is controlled by the main processor group 71. Thereby, this pulse motor driver 69 drives the pulse motor 84 to wind up the screen 65 around the winding core 86. In addition, the right movement key 9 on the operation panel 90
02 is operated, the main processor group 71 controls the pulse motor driver 69. Thereby, this pulse motor driver 69 drives the pulse motor 85 to wind up the screen 65 around the winding core 87.

Further, when the copy key 901 of the operation panel 90 is operated, the main processor group 71 controls the pulse motor driver 69, the lamp regulator 70, and the rotary solenoid 68, and the copying machine 1 is operated.

At this time, the rotary lean lens 68 rotates the mirror 9 out of the optical path of the light incident from the window portion 67, as shown in FIGS. 20 and 21. Further, the lamp regulator 70 causes the exposure lamp 66 to emit light, and the pulse motor driver 69 drives the pulse motor 84,
The screen 65 is wound around a winding core 86.

At this time, the pulse motor 84 winds up the screen 65 in synchronization with the rotation of the photosensitive drum 10. As a result, the image (characters, graphics, etc.) written on the screen 65 is exposed and scanned by the exposure lamp 66 when the image is wound up. In addition, as described above, the copy key 90z of the operation panel 90
is operated, the main processor group 71 controls the motors 31 to 34 and the lamp regulator 81 of the copying machine 1.
, and the variable magnification lens block 8 and mirrors 5, 6, .
7, the exposure lamp 4, and other optical systems are stopped.

The reflected light from the screen 65 is reflected by the mirror 97 as described above, passes through the lens 74, and is further reflected by the mirrors 98, 99 and 100.
guided into the interior of the copying machine 1 through the window 67 of the holding section 591;
An image is formed on the surface of the photoreceptor drum 10. The image formed on the photosensitive drum 10 is transferred to the paper P and discharged to the tray 25 as described above. In this way, the image drawn on the screen 65 is formed on the paper P.

According to the above embodiment, the copying machine 1 is provided with the screen section 61, and the image drawn on the screen 65 of the screen section 61 can be copied by the copying machine 1. Therefore, the image on the screen 65 can be copied almost in the same way as in a normal copying operation, which is extremely convenient when used for a conference or the like.

Furthermore, since the screen section 61 is detachably provided on the document table 2 of the copying machine 1, it has the advantage of not requiring extra space. Furthermore, since it can be easily attached and detached, it can be used as a normal copying machine.

In general, since the copying machine 1 is almost the same as a normal copying machine, the manufacturing cost and copying cost are low (and the copied images are also good).

Further, since the screen 65 is moved according to the operation of the photosensitive drum 10, the copying speed is fast.

In the above embodiment, the copying machine and the screen section are described as being detachable, but the present invention is not limited to this.
It is also possible to make the screen section slidable on the document table 2.

Further, in the above embodiment, a rotary solenoid is used to rotate the mirror 9, but the present invention is not limited to this, and a pulse motor or the like may be used, for example.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an image forming apparatus capable of not only normal copying but also copying of characters, figures, etc. written on a blackboard.

[Brief explanation of the drawing]

The drawings show an embodiment of an image forming apparatus according to the present invention, and FIG. 1 is an external perspective view of the image forming apparatus, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is an exploded perspective view of the image forming apparatus. 4 is a side sectional view of the copying machine according to the present invention, FIG. 5 is a plan view showing the structure of the operation panel, and FIG. 6 is a plan view showing the structure of the drive section. A perspective view showing,
FIG. 7 is a perspective view schematically showing the drive mechanism of the optical system;
The figure is a perspective view schematically showing the pointer drive mechanism, FIG. 9 is a block diagram showing the overall control circuit, FIG. 10 is a block diagram showing the main processor group, and FIG. 11 is a block diagram showing the first sub-processor group. FIG. 12 is a configuration diagram showing the second sub-processor group, FIG. 13 is a schematic configuration diagram showing a pulse motor control circuit, and FIG. 14 is a diagram for explaining the pulse motor speed IM m method. , FIG. 15, FIG. 16, and FIG. 17 schematically show the screen section according to the present invention,
FIG. 15 is a perspective view schematically showing the configuration of the screen section;
FIG. 16 is a perspective view showing the configuration of the screen unit, FIG. 17 is a diagram showing the configuration of the optical system unit, FIGS. 18 and 19 are views showing the configuration of the optical system, and FIG. 18 is an exposure diagram. Top view shown for explaining lamp scanning, 1st
9 is a diagram shown to explain the operation of the optical system, FIG. 20 is a diagram shown to explain the operation of the image forming apparatus, and FIG. 21 is a diagram shown to explain the operation of the image forming apparatus.
Figure 1 is a diagram showing important parts for explanation. 1... Copy machine, 2... Original table, 9... Mirror, 1
0... Photosensitive drum, 591.592... Holding part,
61...Screen part, 65...Screen, 66
...Exposure lamp, 6th...Rotary solenoid,
71... Main processor group, 74... Lens, 8
4.85... Pulse motor, 86.87... Winding core,
90...Operation panel, 901-903...Operation keys, 97-100...Mirror, P...Paper. Applicant's Representative Patent Attorney Takehiko Suzue Figure 12 Figure 13 Figure 15 Figure 16 Figure 17 I)b Figure 18 Figure 19

Claims (4)

[Claims] (1) A first scanning means that moves relative to the first document support member optically scans an image of the document placed on the first document support member, and scans the image of the document placed on the first document support member; It consists of a transfer means that forms a charge pattern by forming a reflected light image from a support member on an image carrier to which a charge has been applied in advance by an image forming means, and develops this charge pattern and transfers it to a transfer material. In an apparatus equipped with an image forming section, a second document support member that is capable of directly forming and displaying a document image on itself, unlike the first document support member; a second scanning means for optically scanning an image formed on the second original support member; and a reflected light image from the second original support member scanned by the second scanning means; An image forming apparatus characterized in that a screen section comprising an optical means for guiding the image to the image forming section is detachably attached to the image forming section. (2) The image forming apparatus according to claim 1, wherein the screen section includes a driving means for moving the second document support member in synchronization with rotation of the image carrier. (3) The image forming apparatus according to claim 1, wherein the screen portion is provided substantially perpendicularly to the first document support member. (4) The image forming means includes a first image forming means for forming a reflected light image from the first document supporting member onto the image carrier, and a second document supporting member guided by the optical means of the screen section. 2. The image forming apparatus according to claim 1, further comprising a second imaging means for guiding a reflected light image from the image forming apparatus to the carrier.