JPH0245875Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a copying device such as an electrophotographic copying machine, and particularly to a blackboard copying machine that copies characters, figures, etc. written on a blackboard.

[Prior art and problems]

Conventionally, characters, 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.

For example, an apparatus has been proposed in which characters are written on a flat panel, held between a pair of rollers, and moved up and down in a reciprocating manner to copy the characters written on the panel surface.

However, with the blackboard copying machine having the above configuration, only the image on the panel can be copied, and normal original copying is not possible. Furthermore, since the panel goes in and out of the copying machine, a large panel cannot be used, and the area on which writing can be made as a blackboard is small, making it impractical as a blackboard. Furthermore, it has not been possible to downsize the copying apparatus as a whole.

Furthermore, copy paper is A4 in Japan and Europe.
(210 x 297 mm) is commonly used, but in the United States, letter size (216 x 279 mm) is commonly used. Therefore, for example, the height is 920 mm,
A board sheet with a width of 1300mm (210 x 297
When copied to letter size with a copying device designed to reduce the width to 297mm -
There was a drawback that 279m = 18mm images could not be captured.

[Purpose of invention]

In view of the above-mentioned drawbacks of the conventional technology, the present invention has been developed by changing the vertical magnification determined by the moving speed of the display member and the moving speed of the photoreceptor without changing the horizontal magnification determined by the optical system of the copying device. To provide a blackboard copying machine capable of copying even on paper.

[Key points of the idea]

In order to achieve the above object, the present invention includes a board sheet that can be written on and erased with a writing instrument and has a predetermined aspect ratio, and a light source and a lens for illuminating the board sheet. an optical system for forming an image at a predetermined magnification, and an image forming means for forming an image formed on the image receptor on a sheet of paper having the same aspect ratio as the predetermined aspect ratio; In a copying apparatus that performs slit exposure on the image receptor by relatively moving the image receptor, the relative movement is performed without changing the magnification of the optical system when copying onto paper having an aspect ratio different from the predetermined aspect ratio. a lateral magnification determined by the optical system by varying the speed of;
It is characterized in that the vertical magnification determined by the relative movement speed is made different.

[Example of idea]

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

FIG. 1 is a perspective view showing the overall structure of the blackboard copying machine of the present invention, and FIG. 2 is a perspective view showing the blackboard copying state of the blackboard copying machine of the present invention.

The blackboard copying machine is composed of a copying section 2 and a board section 1.

As shown in FIGS. 4 and 5, the board section 1 consists of a frame 1a, a board sheet 3, a blackboard optical system 43, and a winding device 40.
The fluorescent lamp 8 in the blackboard lighting section 34 and the first one on the board side
It is composed of a mirror 9, a second mirror 10, and a blackboard lens 11.

FIG. 5 is a schematic diagram of the blackboard optical system 43.

The image illuminated by the fluorescent lamp 8 is transmitted to the blackboard light path 3.
9, an image is formed on the photosensitive drum 12 in the copying section 2 through the first mirror 9, the second mirror 10, and the blackboard lens 11. The first mirror 9 is tilted at 45 degrees with respect to the blackboard optical path 39, and refracts the image vertically backward with respect to the three surfaces of the board sheet. The refracted image is bent further downward by 90 degrees by the first mirror 9, passes through the board copy exposure opening 31 of the copying section 2 by the blackboard lens 11, and reaches onto the photosensitive drum 12 inside the machine.

On the other hand, the winding device 40, as shown in FIG.
The film is wound up by a winding roller 5 via winding rollers b, 4c, and 4d.

Further, the rolled up board sheet 3 forms a surface perpendicular to the frame 1a by the feed rollers 4b and 4c, and is illuminated by a fluorescent lamp 8 at the blackboard illumination section 34.

In the display section of the board section 1, a part of the board sheet 3 appears, and the board sheet 3
A backup board 7 is provided on the back side of the sheet, and the sheet is structured so that it will not bend even when written with a felt pen or the like.

The winding roller 5 is rotated at a constant speed by a drive mechanism (not shown), and winds up the board sheet 3 at a constant speed. After the exposure process of the image reduced by the blackboard optical system 43 and placed on the photoreceptor drum 12 of the copying machine is completed, by pressing the rewind button, the board sheet 3 is wound up by the take-up roller 6 and re-rolled. and can be returned to its original position.

The copying unit 2 is mounted on a copying machine stand 44,
It is provided so that it can be put in and taken out by a rail 45.

Further, a blackboard optical system 43 is provided on the upper surface of the copying section 2.
Exposure opening 31 for board copying where the optical path enters
and a shutter 33 are provided. Therefore, when the copying section 2 is pulled out to the A position and normal copying is performed, the board copying exposure opening 3 from the blackboard optical path is
1 is shielded by a shutter 33.

Furthermore, when the copying section 2 is returned to the B position to perform blackboard copying, the shutter 33 is structured to automatically open.

Here, a normal copying process for copying the original on the original glass 28 will be explained. FIG. 3 is a block diagram of the copying section 2. As shown in FIG. The photoreceptor drum 12 is charged by a charger 13, and the non-image area (portion not subjected to image exposure) is neutralized by a blank lamp 14. Next, the reflected light from the original (not shown) passes through the first copying mirror 25, the copying lens 27,
The image passes through the optical path of the second mirror 26 for copying and is imaged onto the photoreceptor drum 12, thereby forming an electrostatic latent image corresponding to the original on the photoreceptor drum 12.

The lens 27 is set to be movable between two positions: a full-size copy position indicated by a broken line and a reduced copy position indicated by a solid line.

Furthermore, during normal copying of originals, the shutter 33 is located at the position shown by the solid line in order to prevent unnecessary light from entering from the outside.

The electrostatic latent image formed on the photoreceptor drum through the above steps is developed by the developing device 16 and becomes a toner image. The toner image is transferred to a transfer paper fed in time with the image on the photoreceptor by corona discharge of a transfer device 20, and then fixed by a fixing device 22. The transfer paper on which the toner image has been fixed is discharged to the outside of the machine by a paper discharge section 23.

On the other hand, toner that has not been transferred to the transfer paper remains on the photoreceptor drum 12 that has passed through the transfer area, and this residual toner is removed by the cleaner 21, and the photoreceptor drum 12 is charged again by the charger, as described above. Continue the process.

Next, the operating sequence of the machine during the image forming process will be explained. As shown in FIG. 3, a standby sensor 37 for detecting the arrival of the transfer paper is provided immediately before the timing roller 19 on the transfer paper conveyance path. Further, as shown in FIG. 6, on the rear side of the main body of the copying section, there is a micro switch A for detecting the position of the document table 2a.
74, a micro switch B75 is provided, and a push piece A76a provided on the document table 2a;
The push piece B75b and the push piece C76c press down the actuators 74a and 75a of each microswitch, thereby detecting the position of the document table 2a. The normal copying operation is started by operating a copy switch (not shown) provided in the copying section 2. At this time, the document table 2a is on the right side as shown in FIG. 7, and the push piece B76b is stopped in a state where the actuator 75b of the micro switch B75 is pressed down. If the push piece B76b does not press down the actuator 75a of the micro switch B75, the document table 2a is first driven to the right until the push piece B76b presses the actuator 75a, and then the copying operation begins.

When the copy switch (not shown) is operated, the paper feed roller 18 starts rotating, and the paper feed cassette 17
The transfer paper stored therein is sent out to a conveyance path.

The transfer paper sent out to the conveyance path is detected by the standby sensor 37.
After reaching , the paper feed roller 18 continues to rotate for a predetermined time, and the transfer paper stops in contact with the timing roller 19. On the other hand, at the same time as the standby sensor 37 turns ON, the halogen lamp 24 lights up, and at the same time, the document table 2a starts moving forward to the left.

While the document platen 2a is moving forward, the push piece A76a presses the actuator 74a and either at the same time or after a predetermined period of time has elapsed (this predetermined period of time varies depending on the copying magnification; regardless of the magnification, the tip of the toner image on the photoreceptor drum The timing roller 19 starts rotating, and the transfer paper is sent toward the transfer device 20 in synchronization with the toner image on the photoreceptor drum 12. 2
0, the toner image is transferred onto the transfer paper.

On the other hand, on the document table 2a, the rear end of the transfer paper is located at the standby sensor 3.
7 until the transfer paper passes through the standby sensor 37.
After passing, the pushing piece 76b retreats until it presses down the actuator 75A. However, if, for example, the maximum size paper is used as the transfer paper and a reduced copy is made, the push piece 76c presses down the actuator 74a before the trailing edge of the transfer paper passes the standby sensor 37.
In this case, the document table 2a stops until the trailing edge of the transfer paper passes the waiting sensor 37, and then retreats.

Next, a board copy for copying an image written on the board sheet 3 onto transfer paper will be described.

The image forming process is almost the same as normal copying, but the exposure part is different, and when the board sheet 3 is wound up by the winding roller 5, the image such as characters written on the board sheet 3 is exposed to the rollers 4b and 4c.
The light reflected from the board sheet 3 is illuminated by a fluorescent lamp 8 (see Fig. 4).
The photoreceptor drum 12 of the copying section is
The image is formed on the top (Fig. 5).

Here, the relationship between the copying magnification and scanning speed of the board section 1 and the process speed of the copying section 2 will be described.

In Figures 1 and 2, the internal dimensions of the frame 1a where the board sheet 3 is shown are 920 mm in length and 920 mm in width.
The maximum copy paper size in the copy section 2 is B4. However, when copying the board, it is set to be reduced to A4 (210 x 297 mm). In other words, the magnification is set to 210/920 = 0.228 times. To explain this using FIG. 5, the distance between the board sheet 3 and the blackboard lens 11 is A,
Letting B be the distance between the blackboard lens 11 and the photosensitive drum 12, B/A is set to 0.228.

In this embodiment, A=1400 mm, B=319.3 mm, and the focal length f of the blackboard lens 11 is set to 260 mm.

On the other hand, the process speed of copying section 2 is 120mm/
sec, and the winding speed of the board sheet 3 during board copying may be set to 120/0.228=526 mm/sec.

By the way, the magnification of 0.228 determined by the optical system is the horizontal magnification, and the vertical magnification is the board sheet 3 as mentioned above.
It is determined by the speed ratio between the process speed and the process speed.

The size of office paper is generally the same in Japan and Europe.
A4 size is widely used.

However, in the United States, letter size (216 x 279 mm) is widely used, and like A4 size paper, 3 board sheets are used on letter size paper.
When copied by driving at 526mm/sec, 1300mm becomes 297
Since it is reduced to mm, the image will not be captured by 297-279=18mm.

Therefore, in the present invention, when reducing the size to a letter size, the board sheet 3 is driven at 561 mm/sec so that the size is 279/1300=0.214 times. This copies the image on the blackboard with a horizontal magnification of 0.228 and a vertical magnification of 0.214 onto letter-sized paper.

Further, the speed of the board sheet 3 can be appropriately controlled using a servo motor or the like.

Next, scanning during board copying will be explained. Copying on the board section is operated by an operation section 60 provided on the board section as shown in FIG.

When performing board copying, it is necessary that the copying section 2 is in the B position for board copying as shown in Figure 2, so it is necessary to check whether the copying section 2 is in the position for board copying in the board section. A detection section is provided to detect whether or not the copying section 2 is in the B position for board copying.
6 is lit continuously to display this.

Also, when the conditions for image formation in the copying section 2 are not set (for example, when there is no transfer paper or the fixing section is not warmed up), a signal indicating that image formation is not possible from the copying section 2 is sent. The alarm lamp 6 flashes. Note that the lighting state has priority when lighting and blinking the alarm lamp.

Reference numerals 63a to 63e are page designation buttons, and among the five pages of board sheets, the page that appears on the backup board when the most is wound up by the winding roller 6 is the first page; When the page indication button 63a is pressed, the first page appears and the first page display lamp 64a lights up. The same applies to the second to fifth pages.

Reference numeral 65 denotes a print switch, and by pressing the print switch, the page currently appearing on the backup board (the page whose page display lamp is lit) is copied.

However, when the fifth page is displayed, all the board sheets have been pulled out from the take-up roller 6, and the take-up roller 5 cannot take up the sheet, so that copying is not possible. Therefore, when the fifth page is displayed, copying will not start even if the print switch is pressed.

Marks are formed on the board sheet 3 near the upper edge and near the lower edge in order to detect the fixed position of each page (Fig. 10), and mark sensors 56 are provided on the board section at the positions where the marks pass. , 57 are provided. (Figure 4). A first page detection mark 51 for detecting the first page is provided on the upper edge of the board sheet, and no other marks are provided. Further, on the lower edge, a page detection mark for detecting each page and timing marks 53 and 55 for controlling the timing of the copying section are provided for each page.

If the mark sensor 56 detects the first page detection mark 51 when the board unit is powered on, there is no problem; however, if it does not detect the first page detection mark 51, then
(If no page is displayed) The take-up roller 6 is driven until the mark sensor 56 detects the first page detection mark 51. The mark sensor 56 is the first
The mark sensor 57 is configured to detect the page detection mark 52 when the page detection mark 51 is being detected. Therefore, in order to move from the first page to the second page, the mark sensor is detected only when the take-up roller 5 rotates and starts winding up the board sheet 3.
Just turn it OFF and then turn it ON the second time to stop the winding. Since each page is provided with a page detection mark, it is possible to move to each page using the same control.

Now, when the first page of the board sheet is displayed, the copying section is completely set in the position for board copying, and the copying section 2 is also ready for image formation, the operation for copying the first page is as follows. Explain.

When the print switch 65 of the operation section 60 is turned on, a board copy start signal is first sent to the copying section 2, and the copying section prepares for board copying. In order to prevent the original glass 28 and the original cover 30 of the copying section 2 from blocking the exposure during board copying, the original platen 2a advances until the push piece 76c presses down the actuator 74a and then stops (note that the original glass does not block the exposure. If the position is the same, the push piece 76c does not necessarily have to move until the actuator 74a is pressed down, so it is possible to detect it with another detection means).

At the same time, a driving means such as a solenoid (not shown) is used to rotate the upward shutter 33 from the solid line position in FIG. 3 to the broken line position. Also, the copying lens 2
When 7 is at the solid line position for reduction, it is moved to the dotted line position for equal size, which does not block exposure during board copying. The preparation for board copying is completed by the above operations, and the actual board copying operation begins. Note that the preparation operation may be performed when the copying section 2 is set at the position for board copying.

Next, the board copy operation will be explained. First, the paper feed roller 18 starts rotating, and the transfer paper stored in the paper feed cassette 17 is sent out to the conveyance path. After the transfer paper sent out to the conveyance path reaches the standby sensor 37, the paper feed roller 18 continues to rotate for a predetermined time and then stops. The transfer paper stops in contact with the timing roller 19.

On the other hand, at the same time as the standby sensor 37 turns on, a winding signal is sent from the copying section 2 to the board section 1, the winding roller 5 starts winding, and at the same time the fluorescent lamp 8 is turned on. The image on the board sheet 3 that advances as it is wound up by the take-up roller 5 is imaged onto the photoreceptor 12 that rotates by the board-side first mirror 9, the board-side second mirror 10, and the blackboard lens 11, and image exposure is performed. I do.

When the timing mark 53 faces the mark sensor 57 and the mark sensor 57 is turned on, a timing signal is sent from the board section to the copying section, and in the copying section that receives this timing signal, the timing roller 19 starts rotating and then stops. The transfer paper, which had been stopped in contact with the timing roller 19, starts to be conveyed toward the transfer section. The leading edge of the transferred transfer paper coincides with the leading edge of the toner image formed on the photosensitive drum 12, and the toner image is transferred onto the transfer paper by the transfer device 20. After passing the timing mark, when the mark sensor 57 is turned on by the timing mark 55, the winding of the winding roller 5 is stopped and the board sheet 3 is stopped. Further, the transfer paper on which the toner image has been transferred passes through the fixing device 22 and is then discharged to the outside of the copying section by a paper discharge section 23.

In the above explanation, switching operations during board copying and normal copying (evacuation of the document glass 2a, stopping of the document glass drive system, non-operation of the exposure lamp, opening and closing of the shutter 33, etc.) are performed by switching the copying section 2. Although an embodiment has been described in which the switching is performed automatically by moving to the A position and the B position, it goes without saying that the switching may be performed manually.

[Effect of idea]

As explained in detail above, according to the blackboard copying machine of the present invention, if the paper has slightly different lengths and widths, such as A4 size and letter size, it can make biased copies without changing the magnification of the basic optical system. It can be carried out. Also, the difference between horizontal magnification and vertical magnification is 0.228 vs.
It is only 0.214, and due to the nature of blackboard copying, there is no problem with the appearance of finished copies.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of the blackboard copying machine of the present invention, Fig. 2 is a perspective view showing the blackboard copying state of the present invention, and Fig. 3
4 is a cross-sectional view of the board section, FIG. 5 is a schematic diagram of the blackboard optical system, FIG. 6 is a diagram of the micro switch and push piece, and FIGS. 9 is a diagram showing the arrangement of the microswitch and the push piece, FIG. 9 is a diagram showing the configuration of the operating section, and FIG. 10 is a diagram showing the configuration of the board seat section. 1... Board part, 1a... Frame, 2... Copying part,
2a... Original table, 3... Board sheet, 4, 4a, 4
b, 4c, 4d...roller, 5...take-up roller,
6... Winding roller, 7... Backup board,
8... Fluorescent lamp, 9... First mirror, 10... Second mirror, 11... Blackboard lens, 12... Photosensitive drum,
13...Charger, 14...Blank lamp, 15...Exposure, 16...Developer, 17...Paper feed cassette, 18...
Paper feed roller, 19... Timing roller, 20... Transfer device, 21... Cleaner, 22... Fixing device, 23... Paper discharge section, 24... Halogen lamp, 25... First mirror for copying, 26... Second mirror for copying, 27... Copying lens, 28... Original glass, 29... Tip indicator plate, 3
0... Original cover, 31... Exposure opening for board copying,
32... Copying exposure aperture, 33... Shutter, 34... Blackboard illumination section, 37... Standby sensor, 39... Blackboard optical path,
40... Winding device, 43... Blackboard optical system, 44...
Copying machine stand, 45...Rail, 51...First page detection mark, 52...Page detection mark, 53...Timing mark, 54...Page detection mark, 55...Timing mark, 56, 57...Mark sensor, 6
0...Operation unit, 61...Power switch, 62...Power display, 63, 63a, 63b, 63c, 63d, 6
3e...Page instruction button, 64, 64a, 64b, 6
4c, 64d, 64e...Page display lamp, 65
...Print switch, 66...Alarm lamp, 7
4... Micro switch A, 74a... Actuator, 75... Micro switch B, 75a... Actuator, 76a... Push piece A, 76b... Push piece B, 76
c...Press piece C.

Claims (1)

[Claims for Utility Model Registration] A board sheet that can be written and erased with a writing instrument and has a predetermined aspect ratio, and includes a light source and a lens that illuminates the board sheet, and displays a predetermined image on the board sheet on an image receptor. an optical system that forms an image according to a magnification; and an image forming means that forms an image formed on the image receptor on a sheet of paper having the same aspect ratio as the predetermined aspect ratio; In a copying apparatus that performs slit exposure on the image receptor by relatively moving a body, the speed of the relative movement may be varied without changing the magnification of the optical system when copying on paper having an aspect ratio different from the predetermined aspect ratio. A blackboard copying machine characterized in that the horizontal magnification determined by the optical system is made different from the vertical magnification determined by the relative movement speed.