JPH0245876Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a blackboard-duty copying device that uses electrophotographic copying technology to copy characters, figures, etc. written on a blackboard in addition to normal copying. .

[Prior Art] Conventionally, characters and figures 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, a device has been proposed in which characters are written on a writable and erasable flat panel with a felt pen, etc., and the writing is held between a pair of rollers and moved up and down, thereby copying the characters written on the panel surface. There is.

[Problems with conventional technology]

However, in a blackboard copying machine configured as described above, by moving the flat upper panel, the image on the panel that has been scanned and exposed is projected onto the photoreceptor of the copying device and copied, but only the image on the panel is Normal copying of manuscripts was impossible. In addition, since the internal panel of the copying device is moved in and out, 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.

[Purpose of invention]

The present invention has been devised in view of the above-mentioned drawbacks of the conventional art, and an object of the present invention is to provide a blackboard/copying device capable of copying both an image on a blackboard and an original image on a document table without impairing the functions of the copying machine. With the goal.

[Key points of the idea]

In order to achieve the above object, the present invention includes a document table on which a document is placed, an exposure means for projecting and exposing an image of the document onto a photoreceptor, a developing means for developing the exposed image with toner, and a device for feeding paper. a feeding means for stopping the paper once and then refeeding the paper; a transfer means for transferring the toner image onto the paper; and a first means for controlling at least the feeding means, the waiting means, and the exposure means.
a copying section comprising a control means; a board sheet capable of writing and erasing with a writing instrument; a driving means for driving the board sheet; a board optical system for projecting and exposing an image on the board sheet onto the photoreceptor; a second controller for controlling the driving means and the board optical system;
In the blackboard copying apparatus, the first control means controls the board part based on a signal from the second control means, and is capable of selectively copying the original and the image on the board sheet. A member that blocks the optical path of the optical system is retracted from the optical path and the feeding means is driven, and the second control means drives the board sheet and the board optical system based on a signal from the first control means. Further, the first control means drives the standby means based on a signal from the second control means to align the leading edge of the image of the board sheet with the leading edge of the paper.

[Example of idea]

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

FIG. 2a is a perspective view showing the overall configuration of the blackboard/copying machine of the present invention, and FIG. 2b is a perspective view showing the blackboard copying state of the blackboard/copying machine of the present invention.

In the figure, the blackboard copying machine is composed of a board section 1 and a copying section 2. The board section 1 is composed of a frame 1a, a board sheet 3, and a board operation section 4, and inside there is a board optical system. It has a winding device. The copying section 2 has a document cover 2 on the top.
A is provided and is attached so as to be movable back and forth on a rail 5a provided on the copying machine stand 5.

Normally, when copying a document by placing it under the document cover 2a, the copying section 2 is moved forward as shown in FIG.
As shown in FIG. b, the copying section 2 is retracted and used.

FIG. 3 is a diagram showing the internal configuration of the copying section 2. As shown in FIG. When copying an original (not shown) placed on the original glass 6, the original is irradiated with light from the light source 7, and the reflected light from the original is sent to the first copying mirror 8, the copying lens 9a, The photosensitive surface 12 of the photosensitive drum 11 is irradiated (exposed) via the second mirror 10 for copying. At this time, the photosensitive surface 12 is uniformly charged in advance by the charger 13, and the non-image area is neutralized by the blank lamp 14, and an electrostatic latent image is formed on the photosensitive surface 12 by the above-mentioned exposure. Ru. Photosensitive surface 12
The electrostatic latent image formed on the top becomes a toner image visualized by a developing device 16, and a paper feed roller is transferred from a paper feed cassette 18 to the leading edge of the toner image in a transfer device 17 at the same timing by a method described later. 19,
The image is transferred to the transfer paper sent via the timing roller 20. The transferred toner image on the transfer paper is thermally fixed by a fixing device 21, and then transferred to a paper ejection roller 22.
is ejected from the aircraft. On the other hand, residual toner on the photosensitive surface 12 that has not been completely transferred by the transfer device 17 is removed by a cleaner 23, and a uniform charge is applied to the photosensitive surface 12 by a charger 13 in preparation for re-exposure.

On the other hand, the housing 2b of the copying section 2 is located below the original glass 6.
There is an exposure aperture for copying the board (hereinafter referred to as exposure aperture) 2.
4 and an exposure aperture 25 for document copying, and a shutter 26 is provided below the exposure aperture 24.

Further, a leading edge indicator plate 27 is provided at the front of the original glass 6.
is provided.

Next, the timing control operation for aligning the leading edge of the transfer paper with the leading edge of the toner image will be explained with reference to FIGS. 4 and 5a and 5b. A standby sensor 28 for detecting the leading edge of the transfer paper is provided immediately before the timing roller 20 on the conveyance path of the transfer paper, and micro switches 29 and 30 are provided in parallel on the casing 2b of the copying section 2. ing. The micro switches 29 and 30 are provided with actuators 29a and 30a, respectively, and push pieces 31 and 32 are provided at the lower part of the original glass 6 at positions corresponding to the micro switch 29, and push pieces 31 and 32 are provided at positions corresponding to the micro switch 30. A piece 33 is provided. Therefore, the push pieces 31 and 32 are provided at the position to push the actuator 29a, and the push piece 33 is provided at the position to push the actuator 30a. At the start of copying, as shown in FIG. 5a, the push piece 33 is stopped in a depressed state on the actuator 30a. When you turn on the copy switch,
The transfer paper is sent out to the conveyance path by the paper feed roller 19,
After a certain period of time after the standby sensor 28 detects the leading edge of the transfer paper, the transfer paper stops with the leading edge of the transfer paper in contact with the timing roller 20.

On the other hand, at the same time as the standby sensor 28 turns on, the light source 7 turns on, and at the same time, the document glass 6 starts forward scanning in the direction of the arrow 34. When the push piece 31 pushes down the actuator 29a while the document glass 6 is moving forward, the timing roller 20 starts rotating at the same time or after a predetermined time period that varies depending on the copying magnification, and the transfer paper is synchronized with the toner image on the photosensitive surface 12. transfer device 17
sent to.

Further transfer is performed, and the document glass 6 advances until the rear end of the transfer paper passes the standby sensor 28.
When the rear end of the transfer paper passes the standby sensor 28, forward scanning is stopped and backward scanning is performed in the direction of arrow 34b. In addition, when reducing copying is performed using the maximum size paper as the transfer paper, if the push piece 32 pushes down the actuator 29a before the trailing edge of the transfer paper passes the standby sensor 28, the trailing edge of the transfer paper will move to the standby sensor. The original glass 6 is stopped until it passes through 28 and then retreated.

Next, the configuration of the board section 1 will be explained using FIG. 6. The winding device is composed of winding rollers 35, 36, feed rollers 37a to 37d, etc., and winding of the board sheet 3 is performed by passing the board sheet 3 wound many times around the unwinding roller 36 via the feeding rollers 37a to 37d. This is done by winding it up on a winding roller 35. The winding speed at this time is constant by a drive mechanism (not shown). Further, rewinding is performed by pressing a rewind button (not shown) to be wound around the rewind roller 36. Further, the wound board sheet 3 forms a surface perpendicular to the frame 1a by the feed rollers 37a and 37b. Further, the board sheet 3 is also kept vertical by a backup board 38.

Further, in the board optical system, a fluorescent lamp 39 is composed of a first mirror 40, a second mirror 41, a blackboard lens 42, etc. Light irradiation from the light lamp 39 is performed.

Further, as shown in FIG. 7, the board sheet 3 is provided with a first page detection mark 43 at one location on the upper end, and page detection marks 44a, 44b, etc. are provided at a certain interval m on the lower end, and page detection marks 44a, 44b, etc. Timing marks 45a, 45b... are provided at
In this embodiment, page detection marks are provided up to 44e (not shown), and timing marks are provided up to 45e.
(not shown). Therefore, the board sheet 3 is divided into five pages. Also, inside the board section 1, there is a first page detection mark 43 and page detection marks 44a, 44b to 4.
4e, timing marks 45a, 45b to 45e
mark sensors 46 and 47 respectively at positions corresponding to
is provided.

On the other hand, the board operation section 4 includes a power switch 48 and page instruction switches 49a to 49a as shown in FIG.
49e, blind switch 50 and power switch 4
8, a power lamp 51 that lights up when the switch 8 is turned on, a page display lamp 52a to 52e that lights up when each page instruction switch 49a to 49e is turned on, and an alarm lamp 53.

The alarm lamp 53 lights up when the copying section 2 is not in a position to copy the image on the board sheet 3, and blinks when there is no transfer paper or when the fixing device 21 has not reached a certain temperature.

When the power switch 48 is turned on, the take-up roller 36 is driven and the board sheet 3 is moved to the position where the mark sensor 46 detects the first page detection mark 43.
move.

In the blackboard copying machine configured as described above, the process of copying images such as characters and figures drawn on the board sheet 3, which is the essential part of the present invention, will be described below.

FIG. 9 shows the optical path of reflected light 54 from the board sheet 3 when the light from the fluorescent lamp 39 is irradiated onto the board sheet 3 on which characters, figures, etc. are drawn.

As shown in the figure, the reflected light 54 is bent vertically at 90 degrees by a first mirror 40 that is arranged at a 45-degree angle with respect to the reflected light 54, and is further bent by a second mirror 41.
The blackboard lens 42 is bent downward by 90 degrees.
The photosensitive drum 11 in the copying section 2 is exposed to light through the photosensitive drum 11 in the copying section 2. Further, the document glass 6, shutter 26, etc. located on the optical path of the reflected light 54 are moved when the power switch 48 is turned on. For example, the shutter 26 shown in FIG. 3 is moved to the position shown by the dotted line. Further, the original glass 6 and the original cover 2a are also exposed through the exposure port 24.
blackboard lens 4.
The reflected light 54 can pass through the exposure opening 24 provided in the housing 2b and irradiate the photosensitive surface 12 with light.

Further, the copying lens 9a is also moved to the dotted line position 9b when blocking the optical path of the reflected light 54.

After the photosensitive surface 12 is exposed to light, the image drawn on the board sheet 3 is copied onto the transfer paper through the same steps as the above-described original copying, such as development, transfer, and cleaning. At this time, the timing between the image and the transfer paper is adjusted by the first page detection mark 43, page detection marks 44a to 44e, and timing mark 4.
5a to 45e and mark sensors 46 and 47. For example, if you want to copy the third page image drawn on the board sheet 3, turn on the page instruction switch 49c to light the page display lamp 52c indicating copying of the third page, and use a control mechanism (not shown) to The take-up roller 35 is driven, the page detection marks are counted, and when the third page, that is, the page detection mark 44c is detected, the take-up roller 35 is stopped. At this time, the paper feed roller 19 starts rotating and sends the transfer paper from the paper feed cassette 18 to the conveyance path.

After the transfer paper sent out to the conveyance path passes the standby sensor 28, the rotation of the paper feed roller 19 is continued for a predetermined period of time, and the leading edge of the transfer paper is brought into contact with the timing roller 20 and stopped. Further, at the same time when the standby sensor 28 detects the leading edge of the transfer paper, a winding signal is sent to the board section 1 by a control circuit (not shown), and the winding roller 3
Drive 5. This causes the board sheet 3 to move and the timing mark 4 on the board sheet 3 to move.
5c is detected by the mark sensor, a timing signal is sent from the board section 1 to the copying section 2, causing the timing roller 20 to start rotating and causing the transfer device 17 to convey the transfer paper. Through this operation, the leading edge of the toner image on the photosensitive surface 12 and the leading edge of the transfer paper are aligned, and the toner image can be transferred to the correct position on the transfer paper. Further, when the mark sensor 47 detects the next page detection mark 44d, the drive of the take-up roller 35 is stopped.

Further, when copying the first page, second page, fourth page, and fifth page of the board sheet 3, the same operation can be performed.

Next, the operation of the blackboard/copying machine of the present invention will be further described with reference to FIG.

The light from the board sheet 3 passes through the board-side first mirror 40, the board-side second mirror 41, and the board-side lens 42 and is exposed to the photoreceptor drum (Fig. 9). The light that has passed through the board side lens 42 enters from the board copying exposure aperture 24 at. However, at this time, there are the document table glass 6, document cover 2a, shutter 26, and copying lens 9a that block the light. When exposing the photosensitive drum 11 to light perpendicular to it, it is necessary to move the document table glass 6, document cover 2a, shutter 26, and copying lens 9a out of the optical path. That is, the original platen glass 6, the original cover 2
a is moved until the push piece 32 presses down the actuator 29a, the shutter 26 is rotated from the solid line position to the broken line position by a drive means such as a solenoid (not shown), and the copying lens 9a is moved from the reduction direction to the same magnification direction 9b. By moving. The light path can be avoided.

In FIG. 1, a dashed-dotted line 60 is a flow chart of a board control section (not shown), and a dotted line 61 is a flow chart of a copy control section (not shown).

Assuming that the board sheet 3 is currently on the first page, the board print switch 5 of the operation section 4 is pressed.
When 0 is turned on (STEP 1), a board copy start signal is sent to the copying section 2 (STEP 2), and the process moves to the next step at the next point where the board copy signal is received. The copy control unit 61 prepares for board copy.

Next, the original table glass 6 and the original cover 2a are moved (STEP 3), the shutter 26 is rotated (STEP 4), and the lens is moved from the solid line position to the broken line position (STEP 5). At this stage, copy preparation is complete. Next, the paper feed roller 19 begins to rotate (STEP 6)
The transfer paper in the cassette is sent out to the conveyance path. After the transfer paper reaches the standby sensor 28 (STEP 7),
A timer is set (STEP 9), and after a predetermined period of time has elapsed (STEP 11), the paper feed roller 19 stops in contact with the timing roller 20 (STEP 12).

When the leading edge of the transfer paper turns on the standby sensor (STEP 7), a winding signal is sent from the copying control unit 61 to the control unit 60, which drives the board sheet and starts winding (STEP 8), and the fluorescent lamp 39 lights up. (STEP 10).
The image on the board sheet 3, which is irradiated by the fluorescent lamp 39 while being wound up on the take-up roller 35, passes through the first board-side mirror 40, the second board-side mirror 41, and the board-side lens 42, and is exposed to light as it rotates. The body drum 11 is exposed to light.

Next, when the mark sensor 47 detects the timing mark 45a (STEP 13), the board control unit 6
0, a timing signal is sent to the copy control unit 61, the timing roller 20 starts rotating, and the transfer paper that had been stopped in contact with the timing roller 20 starts to be conveyed toward the transfer unit 17 (STEP 14).

The leading edge of the conveyed transfer paper coincides with the leading edge of the toner image on the photosensitive drum 11, and is transferred onto the transfer paper by the transfer device 17.

When the mark sensor 47 detects the timing mark 44b, copying of the entire page is completed, the winding roller 35 stops winding, and the board sheet 3 stops.

Then, the transfer paper passes through a separating section and a fixing section 21, and is discharged by a paper discharging section 22.

[Effect of idea]

As explained in detail above, according to the present invention, the order of the copying machines is utilized to the maximum with very few interface exchanges between the normal copying machine and the blackboard unit, so the control circuit of the blackboard unit can be minimized. It's over.

Furthermore, the copying apparatus can be made smaller and costs can be reduced. In addition, it is possible to copy not only images on the panel but also ordinary originals.

[Brief explanation of the drawing]

Fig. 1 is a flowchart of the timing of the present invention, Fig. 2a is a perspective view of the copying apparatus of the present invention,
Figure b is a perspective view of the copying machine showing the blackboard copying state, Figure 3 is a configuration diagram of the copying section, Figure 4 is a configuration diagram of the micro switch and push piece, and Figures 5 a and b are the configuration diagram of the micro switch and push piece. Layout configuration diagram, Figure 6 is a configuration diagram of the board section, Figure 7 is a configuration diagram of the board sheet, and Figure 8 is a configuration diagram of the board section.
The figure is a block diagram of the operating section, and FIG. 9 is a block diagram showing the optical path of reflected light. DESCRIPTION OF SYMBOLS 1... Board part, 2... Copying part, 3... Board sheet, 6... Original table glass, 11... Photosensitive drum, 2
6... Shutter, 28... Standby sensor, 40... First mirror, 41... Second mirror, 42... Blackboard lens,
43...First page detection mark, 44a, 44b...
Page detection mark, 45a, 45b...timing mark, 54...reflected light.

Claims (1)

[Scope of Claim for Utility Model Registration] A document table on which a document is placed, an exposure device that projects and exposes an image of the document onto a photoreceptor, a developing device that develops the exposed image with toner, and a feeder that feeds the paper. a standby means for once stopping the paper and then refeeding the paper; a transfer means for transferring the toner image onto the paper; and a first control means for controlling at least the feeding means, the standby means, and the exposure means. a board sheet that can be written on and erased with a writing instrument; a driving means for driving the board sheet; a board optical system that projects and exposes an image on the board sheet onto the photoreceptor; A blackboard/copying apparatus comprising a board unit including a second control means for controlling a board optical system, and capable of selectively copying the original document and an image on the board sheet, wherein the first control means is configured to control the second control means for controlling the board optical system. Based on a signal from the control means, a member that blocks the optical path of the board optical system is retracted from the optical path and the feeding means is driven; and the second control means drives the board sheet based on the signal from the first control means. and driving the board optical system, and further characterized in that the first control means drives the standby means based on a signal from the second control means to match the leading edge of the image of the board sheet and the leading edge of the paper. A copying machine that also serves as a blackboard.