JPS62125381A - Picture forming device - Google Patents

Abstract

PURPOSE:To copy a large character, a graphic, etc., described on a blackboard by providing a screen part having a writable second original supporting member at a copying machine. CONSTITUTION:At a copying machine 1, a screen part 61 is provided, the picture drawn on a screen 65 of the screen part 61 can be copied by the copying machine 1 and by supporting an original to the screen part 61 with a leaf spring 150, the original can be copied. Consequently, not only the usual copying can be executed by the copying machine 1, but also the picture formed on the screen 65 can be copied, and the large original, which cannot be copied by the original platen, can be also copied approximately in the same way as the usual copying action.

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 copying machine original supporting member.

In other words, general electronic copying machines cannot copy large originals larger than A3 size at one time.

[Object of the invention] This invention was made based on the above circumstances,
The purpose is to provide an image forming bag that can not only perform normal copying but also copy characters and figures written on a blackboard, as well as copy large originals.

[Summary of the Invention] The present invention provides a copying machine with a screen portion including a second document support member on which an original N image can be directly written on itself, such as a blackboard, and the image drawn on the screen portion is In particular, the screen is provided with document support means, and the support means supports large documents.

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

In FIGS. 3 and 4, a screen portion 61 is provided above the copy form 1. As shown in FIG. This screen part 61
consists of a screen unit 62 and an optical system unit 63, and is attached to the copy 1fi1 via a slide rail 130. This screen portion 61 is driven by a drive means provided near the slide rail 130,
For example, a pinion and a motor that drives the pinion,
A rack (none of which is shown) provided on the screen portion 61 and meshed with the binion allows it to slide on the copying machine 1 as shown by arrows A1 and A2 in the figure. Further, a screen window 64 is formed on the front surface of the screen portion 61, and a screen 65 serving as a second document support member is provided inside the screen window 64 as shown by the arrow b1.
, b2 direction.

Further, a document table (transparent glass) 2 serving as a first document support member is fixed to the upper surface of the copy t11, and a document cover 3 that can be opened and closed is provided on the document table 2.

Furthermore, a fixed scale 21 is provided at one end of the document table 2 to serve as a reference for setting the document. Furthermore, near the other end of the document table 2, light corresponding to the image on the screen 65 outputted from the screen section 61 is transmitted to the copying machine 1.
A window portion 67 is provided that leads into the inside of the container. This window part 67
For example, a dustproof glass 67a is provided so as to be perpendicular to the optical axis of the incident light.

Further, when copying an original on the original platen 2 in the copying machine 111, the window portion 67 is covered with a cover (not shown) to prevent light from entering the copying machine 1 from outside.

FIG. 5 shows the copying machine 1. As shown in FIG. The original placed on the original platen 2 is exposed to an exposure lamp 4, mirrors 5, 6, .
By reciprocating the optical system 7 in the direction of 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 path 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, passes through the variable magnification lens block 8, and is 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 the arrow C shown in the drawing, and the surface is first charged by the charging device 11, and then the image is exposed to a third light, thereby forming a static N latent gap on the surface. This electrostatic latent image is made into a visible image by applying toner to it by the phenomenon 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 copy question 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.
+, 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 according to the insertion of cassettes of different sizes.

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
It is electrostatically peeled off from the photoreceptor drum 10 by the action of step 1,
The image is conveyed by a 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 the transferred image is fixed by passing therethrough. After fixing, the paper P is discharged to a tray 25 outside the copying machine 1 by a pair of paper discharge rollers 24.

Further, the photoreceptor drum 10 after the transfer is transferred to a charger 26 for removing static electricity.
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. 6 shows the operation panel 30 provided on the copy 811.
This shows that. 301 is a copy key for commanding the start of copying; 302 is a numeric keypad for setting the number of copies, etc.; 30
3 is a display section that displays the operating status of each part and paper jams, etc.; 304 is a cassette selection key that selects the upper and lower paper feed cassettes 13 and 14; 305 is a cassette display section that displays the selected cassette; 306 is a cassette display section that displays the selected cassette; A magnification setting key for setting the magnification and reduction magnification of copies in a predetermined relationship; 307 is an enlargement;
A zoom key 308 is used to set the reduction magnification steplessly, a display section 308 displays the set magnification, and a density setting section 30s is used to set the copy density.

Further, at the left end of the operation panel 30, a switching key 901 for operating the screen section 61 is provided.

This switching key 901 is used to select normal copying using the document table 2 or copying using the screen unit 61, and to switch the settings of the copying operation according to the selection. A display 902 is provided near the switching key 901 (η) to display the operating state of the switching key 90t.
03 is a right movement key for moving the screen 65 to the right;
904 is a left movement key for moving the screen 65 to the left.

FIG. 7 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 performing magnification change in the direction indicated by the arrow in the figure. 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.

34 is a shutter motor, which connects the photosensitive drum 10 when changing magnification.
This is a motor for moving a shutter (not shown) for adjusting the charging width by the charger 11. 35
A developing motor is a motor for driving a developing roller and the like of the developing device 12. 36 is the drum motor,
This 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. 38 is a paper feed motor, which is connected to the above-mentioned feed roller 15.
．． This is a motor for driving 16.

A paper feeding motor 39 is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 8 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by the first carriage 41, and the mirror 6.7 is supported by the second carriage 412, and these carriages 411 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 idle pulley 44.
One end of a first carriage 411 that supports the mirror 5 is fixed in the middle of the mirror. On the other hand, a rail 422 is attached to the guide portion 46 of the second carriage 412 that supports the mirror 6.7.
Two pulleys 47.47 are rotatably provided apart from each other in the axial direction, and a wire 48 is stretched between these pulleys 47.47. One end of this wire 48 is fixed to a fixed part 49, and the other end is fixed to the fixed part 49 via a coil spring 50. 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 a speed of 1772. Furthermore, the 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 wheel of, for example, a rotary solenoid 68 is attached to the base end of the mirror 9, and the mirror 9 is rotated as required by this 〇-tally solenoid 68. .・Furthermore, the above document table 2
displays the copyable range corresponding to the specified paper. That is, if the paper size specified by the cassette selection key 304 is (PX, py) and the copy magnification specified by the magnification setting keys 30s and 307 is K, the copyable range (x, y) is x-Px. /K y-Py/. Of this copyable range (x, y), the X direction is indicated by the pointers 51 and 52 provided on the back surface of the document table 2, and the y 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. 9, the above-mentioned pointers 51 and 52
．． 55 via a spring 56. The pulley 55 is rotated by a motor 58, and by driving the motor 58 in accordance with the paper size and magnification, the distance between the pointers 51 and 52 can be changed. ing.

Further, the first carriage 411 is moved to a predetermined position M (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. 10 shows the overall control circuit, including a main processor group 71 and first and second sub-processor groups 72 and 73.
It is mainly composed of. Upper 8 main processor group 71
, a high-voltage transformer 76 that detects inputs from the operation panel 30 and various switches and sensors, such as the input device 75 force 1 such as the cassette size detection switch 5Q1.602, and drives the various chargers; the static elimination lamp 28; The blade solenoid 27a of the cleaner 27, the heater 23a of the fixing port 23, the exposure lamp 4, and each of the motors 31 to 40.58 are controlled to perform the copying operation described above.

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.

Roughly speaking, the main processor group 71 includes six pulse motor drivers that control the pulse motors 84 and 85 that move the screen 65, and a lamp regulator 70 that controls the exposure lamp 66 that irradiates the screen 65 with light.
, and the rotary solenoid 68h (connected) that drives the mirror 9.Then, the pulse motor drino\69, the lamp regulator 70, and the rotor 1
The no-solenoid 68 is controlled by the main processor 71 in response to signal detection from the switching key 901 and movement keys 903 and 904.

FIG. 11 shows an example of the configuration of the main processor 8\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 9
1 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. A size switch for detecting paper size and other inputs are connected to the input/output boat 94. A copy condition setting switch and other inputs are connected to 95.

Then, for example, through the input/output boat 96, the key force on the front two operation panels 30 is detected, and the motors, exposure lamps, etc. are controlled in accordance with the key force.

FIG. 12 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
Input/output boats 103 and 104 are connected to the input/output ports 103 and 104, to which position information from the position n sensor 83 is input. 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. 13 shows the configuration of the second sub-processor group 73. In other words, 111 is a microcomputer connected to the main processor group 71. 112 is a pulse motor phase switching interval time control. This is a programmable interval timer for use in the microcontroller 111, which counts based on the setting value set by the microcomputer 111, and outputs a termination 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. Also, an input/output board 114 is connected to the microcomputer 111, and the motor 36 is connected to the input/output board 114 via the pulse motor driver 80. ．．
38, 39, and 58 are connected.

Fig. 14 shows the control circuit of the pulse motor, and shows the input/output boat 121 (input/output boat 1 in Figs.
04.114) has a pulse motor driver 122
(Equivalent to pulse motor driver 79.80 in Figure 10)
is connected to this pulse motor driver 122, and a pulse motor 123 (the above-mentioned pulse motors 31 to 34, 36, 3
8.39), each volume mA, B, A, B is in series.

Figure 15 shows the speed control method of the 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, then gradually improves 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 gist of the invention will be explained with reference to FIGS. 1 and 2. FIGS. 1(1)) and 1(C) schematically explain the configurations of the screen unit 62J5 and the optical system unit 63 of the screen section 61. In the screen unit 62, the screen 65 is endlessly passed over rollers 86,87. These rollers 86.87 each have a gear 861.8.
71 are provided, and these gears 861.87+l
Gear 841 rotated by motor 84.85
．． 851 are engaged. And the screen 6
5 is moved in the directions of arrows bl and b2 shown in the figure by driving motors 84 and 85 in response to operations of the right movement key 90 and the left movement key 904 on the operation panel 30.

Further, a plate spring 150, for example, is fixed to a part of the screen 65 as a document support means. This leaf spring 150 is connected to the screen 6 as shown in FIG. 1(a).
As shown in FIG. 5(d), the document tray is inserted and supported in such a manner that it is brought into close contact with the screen 65.

Further, inside the optical system unit 63, for example, a first
As shown in Figure (e), an exposure lamp 66, a lens 74, and mirrors 97, 98, 99, and 100 are provided. The fog light lamp 66 and mirror 97 are shown in FIG.
) and as shown in FIG. 1(f), it is provided near the roller 86 of the screen 65 along the width direction of the screen 65. The light generated by the exposure lamp 66 is irradiated onto the surface of the screen 65 which is stretched around a roller 86.

Next, zero production in the above configuration will be explained.

For example, when the copying machine 1 is powered on, the main processor group 71 controls the screen section 61 to be moved by 1.DELTA. above the document table 2, and normal copying operations are enabled.

In this state, when the switching key 901 of the operation panel 3o is operated, the main processor group 71 causes the display 90 to
2 is turned on, and the screen section 61 is driven onto the copy 811 under the control of the second sub-processor group 73.
The copy 8!11 is enabled to copy the image on the screen section 61. At this time, the mirror 9 is rotated by the rotary solenoid 68 out of the optical path of the light incident from the glass 67a, and the various keys 301 to 309 of the panel 30 are operated to set the copying conditions, etc. It is operated for copying. Therefore, for example, when the numeric keypad 302 is operated, the number of copies of the image on the screen section 61 is set.

In this state, the copy key 30 of the operation panel 30
1 is operated, the main processor group 71 stops the motors 31 to 34 and lamp regulator 81 of the copying machine 1, and also stops the variable magnification lens block 8, mirror 5, 6, 7, exposure lamp 4, etc. The operation of the optical system is stopped.

At the same time, the photosensitive drum 10, the developing device 12, etc. are operated. At the same time, the lamp regulator 70 causes the exposure lamp 66 of the screen section 61 to emit light, and the pulse motor driver 69 drives the pulse motor 84 that moves the screen 65. At this time, the pulse motor 84 moves the screen 65 in synchronization with the rotation of the photosensitive drum 10. Thereby, the image written on the screen 65 is exposed and scanned by the exposure lamp 66 when the image is moved.

The reflected light from this screen 65 is shown in FIG. 1(q) to (
As shown in i), after being reflected by mirror 97, it passes through lens 74 and is further reflected by mirrors 98, 99 and 100.
The reflected light is guided into the copying machine 1 through the window 67 and formed into an image on the surface of the photoreceptor drum 10. As mentioned above, the image formed on the photosensitive drum 10 is
are transferred to and discharged onto Rays 1 to 25. In this way, the image written on the screen 65 is formed on the paper P.

Moreover, as shown in FIG. 2(a), Hara! 1D is leaf spring 1
After being supported on the screen 65 by 50, the copy key 3
When 01 is operated, as shown in Fig. 2(b) and (C),
The screen 65 and the original [0 are moved in the direction of the arrow b1, and the original held on the screen 65 is copied by the same operation as described above.

On the other hand, if the switching key 901 is operated again in the above state, the display 902 is turned off and the screen portion 61 is slid from above the copying machine 1 to the upper rear. Further, various keys on the operation panel 30 and copying condition setting switches 301 to 309 are switched to copying the original image, and the mirror 9 is rotated to a predetermined position by the rotary solenoid 68, so that the copying machine 1 operates normally. It is possible to copy the original image.

According to the above embodiment, the copying machine 1 is provided with the screen section 61, the image drawn on the screen 65 of the screen section 61 can be copied by the copying machine 1, and the plate spring 150 is attached to the screen section 61 to prevent the document from being pressed. By supporting the paper, originals can also be copied. Therefore, the copying machine 1 can not only perform normal copying but also copy images formed on the screen 65, and can also copy large originals that cannot be copied on the document table 2 in almost the same way as normal copying operations. It is extremely convenient. Moreover, copying of a document using the screen portion 61 can be easily and quickly performed by the leaf spring 150, and therefore no special mechanism 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.

Further, the screen 65 is connected to WjJ of the photoreceptor drum 10.
Since it is moved according to ff, the copying speed is fast.

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.

Further, although a temporary spring is used as the support means, the present invention is not limited to this, and a mounting device such as a clip may be used, for example, to prevent the document from shifting or coming off during exposure scanning.

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

[Effects of the Invention] As detailed above, according to the present invention, an image forming apparatus is provided which is capable of not only normal copying but also copying of characters and figures written on a blackboard, as well as capable of copying large originals. can.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG.
a) is an external perspective view of the image forming apparatus of the present invention, and FIG.
) is a configuration diagram of the screen section according to the present invention seen from above, FIG. Figure (e) is an exploded perspective view showing the optical system unit of the screen section taken out; Figure (f) is a top view of the main parts shown to explain exposure scanning of the screen section; Figure <g) is a diagram shown to explain the relationship between the screen unit and the copying machine, Figure <h) is a diagram shown to explain the copying operation of the screen unit, and Figure (1) is a diagram shown to explain the main points of the copying machine. 2 is a perspective view shown to explain the operation of the screen, FIG. 3 is an external perspective view of the image forming apparatus, and FIG. 4 is a view of the image forming apparatus with the screen section removed. 5 is a side sectional view of the copying device according to the present invention, FIG. 6 is a plan view showing the configuration of the operation panel, FIG. 7 is a perspective view showing the configuration of the drive section, and FIG. 8 is the optical system. FIG. 9 is a perspective view schematically showing the pointer drive mechanism, FIG. 10 is a configuration diagram showing the overall control circuit, and FIG. 11 is a main processor group. FIG. 12 is a configuration diagram showing the first sub-processor group;
FIG. 14 is a block diagram showing the second sub-processor group, FIG. 14 is a schematic block diagram showing a pulse motor control circuit, and FIG. 15 is a diagram for explaining the pulse motor speed 1lII I11 method. 1... Copy machine, 2... Original table, 9... Mirror, 1
0... Photosensitive drum, 30... Operation panel, 61.
...Screen part, 65...Screen, 66...
Exposure lamp, 68... Rotary solenoid, 71.
・・Main processor group, 74 ・・Lens, 84.8
5...Pulse motor, 86.87...Roller, 97
~100...Mirror, 130...Slide rail,
150... Leaf spring (supporting means), D... Manuscript, P.
...Paper. Applicant's representative Patent attorney Takehiko Suzue Figure 1 (b)

Claims (3)

[Claims] (1) a first scanning means that moves relative to the first document support member and optically scans an image of the document placed on the first document support member; a first optical means for guiding a reflected light image of the original document scanned by the means to an image carrier to which a charge has been applied in advance; a developing means for developing the charge pattern formed on the image carrier; In an image forming apparatus, the image forming apparatus includes a second document support member on which a document image can be directly formed, and a transfer device that transfers a document image onto a transfer material. a second scanning means for optically scanning the image formed on the second original supporting member; and a second scanning means for optically scanning the image formed on the second original supporting member; An image forming apparatus comprising: a screen portion comprising a second optical means for guiding the image to the image carrier; and a support means provided on the second document support member to support the document. (2) The image bearing member rotates in synchronization with exposure scanning by the first scanning means, and the screen portion is a driving means for moving the second document support member in synchronization with the rotation of the image bearing member. An image forming apparatus according to claim 1, characterized in that the image forming apparatus comprises: (3) The image forming apparatus according to claim 1, wherein the screen portion is provided with a second document support member substantially perpendicular to the first document support member.