JPS61290467A - Image forming device - Google Patents

Abstract

PURPOSE:To copy an image on a screen by exposing and scanning characters, graphics, etc. on the screen at the winding of the screen and forming their image on the surface of a photosensitive drum in a copying machine. CONSTITUTION:When a copy key on an operation panel 90 is depressed. a pulse motor driver 69, a lamp regulator 70, etc. are controlled by a main processor group 71 to drive the copying machine. At that time, a pulse motor 84 winds up the screen synchronously with the rotation of the photosensitive drum. Consequently, characters, graphics, etc. described on the screen are exposed and scanned by a lamp 66 at the winding of the screen. The reflected light from the screen is led into the copying machine through plural mirrors and forms its image on the surface of the drum. The formed image is transferred to paper and the paper is discharged from a tray.

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.

UObject of the invention] This invention was 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 screen portion including a second document support member on which a document image can be written directly on itself like a blackboard, and The image can be copied using a 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. 1 is a copying machine, and a screen portion 61 is detachably attached to the upper part of the copying machine 1. That is, holding parts 591 and 592 are provided on both sides of the upper part of the copy 111, 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 copying machine 1 into the interior of the copying machine 1. 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, which will be described later, is provided at the bottom of the screen window 64.

FIG. 3 schematically shows the configuration of the copying machine 111. On the top surface of this copying machine 1, there is a document table (transparent glass) which is the first document support member that supports the document.
2 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 platen 2 is moved back and forth by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7 along the lower surface of the original platen 2 in the direction of arrow a. It is designed to be exposed and scanned. In this case, mirror 6.
Mirror 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 a photoreceptor drum 10, 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. 19, and is sent to the transfer section by this pair of registration rollers 19. Here, the paper feed cassette 1
3.14 is removably provided at the lower right end of the copying machine 1, and either one can be selected on the operation panel described later. Note that each of the paper feed cassettes 13 and 14 has a cassette size detection switch 60.
z, 602, the cassette size is detected. This cassette size detection switch 601.60
2 is composed of a plurality of microswitches that are turned on and off depending on the taste of different cassettes.

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 the peeling band 1! It is electrostatically separated from the photosensitive drum 1o by the action of the device 21, is conveyed by the conveyor belt 22, and is sent to the fixing roller 23 as a fixing device provided at the terminal end of the conveyor belt 22, and by passing therethrough, the transferred image is is established. Then, the paper P in the fixing device is discharged to a tray 25 outside the copy 1111 by a pair of paper discharge rollers 24. After the photosensitive drum 10 has been transferred, the charge is removed by a defrosting charger 26, and residual toner on the surface is removed by a cleaner 27.
The afterimage is roughly erased by the static eliminating lamp 28, so that the initial state is restored. Note that 29 is a cooling fan for preventing the temperature inside the copying machine 1 from rising.

FIG. 4 shows an operation panel 30 provided on the copying machine 1. As shown in FIG. 30s is a copy key for starting 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; 30s 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, 30B is a display section for displaying the set magnification, and 309 is a density setting section for setting the copy density.

FIG. 5 shows an example of the configuration of a drive source for each drive section of the copying machine 1 configured as described above, and is composed of 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. 3
3 is a scanning motor, which connects the exposure lamp 4 and mirror 5.
, a motor for moving 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. 3A is a fixing motor, which is a motor for driving the paper transport path 22, the pair of fixing rollers 23, and the pair of paper discharge rollers 24. A paper feeding motor 38 is a motor for driving the delivery rollers 15 and '16. 39 is a paper feed motor, which is connected to the registration roller pair 1 mentioned above.
This is a motor for driving 9. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 6 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 411, 412 are guided by guide rails 421, 422 in the direction of arrow a. It can be moved 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 idle 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 in the guide section 46 of the second carriage 412 that supports the mirror 6.7, spaced apart in the axial direction of the rail 422. wire 4 to
8 is hanging. One end of this wire 48 is attached to the fixed part 4
9, the other end is fixed to the fixing part 49 via a coil spring 50, respectively. In addition, the wire 48
One end of the first carriage 411 is fixed in the middle. Therefore, as the pulse motor 33 rotates, the belt 45 rotates and the first carriage 41! 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 412
move in the same direction at 1/2 the speed. Note that the moving directions of the first and second carriages 411 and 412 are controlled by switching the rotation direction of the pulse motor 33.

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

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. In other words, paper selection key 3
If the paper size specified by 04 is (Px, Py) and the copy magnification specified by magnification setting keys 30G and 307 is K, then the copyable range (x, y) is: X-PX/K y-Py /becomes. Of this copyable range (X, 'j), 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 upper lN of the first carriage 411.
It is displayed on a scale 53 provided at 811.

As shown in FIG. 7, 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.

Also, the first carriage 41! is moved to a predetermined position (home position according to the magnification) by driving a 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. 8 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 input from the operation panel 30 and various switches and sensors, such as input devices 75 such as the cassette size detection switches 601 and 602, and drives the various chargers, the static elimination lamp 28, and the cleaner 27. a blade solenoid 27a1, a heater 23a1 for the pair of fixing rollers 23, and an exposure lamp 4;

The copying operation described above is performed by controlling each of the motors 31 to 40, 58, etc.

Among the above motors 31 to 40.58, motor 35.37
．． A toner motor 77 that supplies toner to 40 and 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 a pulse motor driver 79 . The motors 36, 38, 39, 58 are controlled by the second sub-processor group 73 via a 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. 9 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 human input of keys on an operation panel (30) (not shown) and controls various displays via an input/output board 92. Also, the microcomputer 91.

It 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, input/output boat 9
6, a key human power on an operation panel (90) (not shown) is detected, and a motor, an exposure lamp, etc., corresponding to this key human power are controlled.

FIG. 10 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. 11 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 pulse is latched by the latch circuit 113, and its output is supplied to the interrupt line and input/output board input line of the microcomputer 111. In addition, the microcomputer 111 also has an input/output board 1.
14 is connected to this input/output boat 114, and motors 36 and 38 are connected to it via the pulse motor driver 80.
．． 39.58 are connected.

Figure 12 shows the control circuit of the pulse motor.
04.114) has a pulse motor driver 122
(corresponding to the pulse motor driver 79.8o in FIG. 8) is connected to this pulse motor driver 122, and a pulse motor 123 (the above pulse motors 31 to 34,
．． 39) are connected to each other.

Figure 13 shows the speed control method of a pulse motor.
The figure (a> is the speed curve of the pulse motor, and the figure (b) is 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. Furthermore, tl, t2
...tx indicates the time of the phase switching interval.

Next, the screen section 61 will be further explained.

FIGS. 14 and 15 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.

Each of these winding cores 86.87 has a gear 861.87t.
These gears 86t and 87s are provided with a gear 841.85t rotated by a motor 84.85.
are engaged. Then, by driving the motors 84 and 85, the screen 65 is moved by the arrow b shown in the figure.
! , b2 direction.

Furthermore, inside the optical system unit 63, for example,
1. As shown in Figure 16, Figure 17 and Figure 18. τ
Nine pumps 66, lenses 74 and mirrors 97.98.9
9.100 is provided. The exposure lamp 66 and mirror 97 are connected to the screen 65 as shown in FIG.
The screen 65 is provided near the winding core 86 along the width of the screen 65.

Light generated from the exposure lamp 66 is irradiated onto the surface of the screen 65 wound around the winding core 86 . The reflected light from the screen 65 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. guided by.

FIG. 19 shows an operation panel 90 provided at the bottom of the entire surface of the screen unit 62 of the screen section 61. As shown in FIG. 901 is a copy key that commands the start of copying the 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.

Next, the operation in the above configuration will be explained. That is, when the left movement key 903 of the operation panel 90 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, as shown in FIGS. 20 and 21, the rotary solenoid 68 rotates the mirror 9 by 1° out of the optical path of the light incident from the window 67. Also, the lamp regulator 70 rotates the exposure lamp 66 The pulse motor driver 69 drives the pulse motor 84 to wind the screen 65 around the 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, figures, etc.) written on the screen 65 is transferred to the exposure lamp 66.
Therefore, exposure scanning is performed when the film is wound up. Further, as described above, the copy key 90 of the operation panel 90
1 is operated, the main processor group 71 controls the motors 31 to 34 and lamp regulator 8 of the copying machine 1.
1, stop the variable magnification lens block 8, and mirror 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 portion 67 of the holding portion 591;
An image is formed on the surface of the photoreceptor drum 10. The image formed on the photosensitive drum 10 is transferred onto the paper P and discharged onto 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 provided on the document table 2 of the copying machine 1, it has the advantage that no extra space is required.

Furthermore, 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.

Furthermore, since the screen 65 is moved in accordance with the operation of the photosensitive drum 10, the copying speed is slow.

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, and 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.

In addition, it goes without saying that various modifications can be made to (X) without departing from the gist of the present 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 drawings]

1 and 2 each show an embodiment of an image forming apparatus according to the present invention, FIG. 1 is an external perspective view of the image forming apparatus, and FIG. 2 is an exploded view of FIG. 1. FIG. 3 is a side sectional view of the copying machine according to the present invention, FIG. 4 is a plan view showing the configuration of the operation panel, FIG. 5 is a perspective view similarly showing the configuration of the drive section, and FIG. FIG. 7 is a perspective view schematically showing the drive mechanism of the optical system; FIG. 7 is a perspective view schematically showing the drive mechanism of the pointer; FIG. 8 is a configuration diagram showing the overall control circuit; FIG.
The figure is a configuration diagram showing the main processor group.
FIG. 11 is a block diagram showing the sub-processor group, FIG. 11 is a block diagram showing the second sub-processor group, FIG. 12 is a schematic block diagram showing the pulse motor control circuit, and FIG. 13 explains the pulse motor speed control method. Figure 14, Figure 15,
FIG. 16 schematically shows a screen section according to the present invention, FIG. 14 is a perspective view schematically showing the structure of the screen section, FIG. 15 is a perspective view showing the structure of the screen unit, and FIG. 17 and 18 show the structure of the optical system, and FIG. 17 is a top view shown to explain the scanning of the exposure lamp, and FIG. 18 is a diagram shown to explain the operation of the optical system, FIG. 19 is a plan view showing the configuration of the operation panel of the screen section, 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. The figure 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, 68...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 11 Figure 12 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Procedural amendment document Showa-0.1R.22 Patent Office Director Uga Michibe 1, Indication of the case, Patent Application No. 1988-132417 2, Name of the invention Image forming device 3, Person making the amendment Relationship to the case Patent applicant (307) Toshiba Corporation 46 Agent Tokyo 17 Mori Building 6, 1-26-5 Toranomon, Miyakominato-ku,
Description to be amended Document 7, Contents of the amendment The claims are amended as shown in the appendix 2. Claims (1) By the first scanning means that moves relative to the first document support member. The image of the document placed on the first document support member is optically scanned, and the reflected light image from the first document support member is focused on an image carrier to which a charge has been applied in advance. An image forming section comprising a transfer means that forms an image to form a charge pattern, develops this charge pattern, and transfers it to the limb transfer material. a second document support member capable of freely forming and displaying a document image; and a second document support member that moves relative to the second document support member and optically scans the image formed on the second document support member. and an optical means that guides the reflected light image from the second document support member scanned by the second scanning means to the image forming section. Part + i *
An image forming apparatus characterized by @. (2) The image forming apparatus according to claim 1, wherein the screen section includes a drive means for moving the second document support member in synchronization with the rotation of the image carrier 111. (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 of the image to the carrier.

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 drive 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 of the image to the carrier.