JPS61249795A - Picture forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus capable of copying an image drawn on a blackboard and copying a manuscript.

[Prior art]

Conventionally, at meetings, lectures, etc., characters, nine figures, etc. written on a blackboard were transcribed into No. 1-. 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.

This type of device consists of a blackboard section and a copying section.
The copying section is a device that can also make normal original copies; when copying an original, the copying section is moved forward, and when copying an image on a blackboard, the copying section is moved to the rear.

[Problems with conventional technology]

Even in this apparatus, if copying is performed with the copying section not fully moved forward or backward, the document table above the copying section will move left and right when copying an original.

Because the copying unit moves incompletely, it comes into contact with surrounding members and damages the document table and the like. Further, when the copying unit moves during copying, if the copying operation is not stopped, the above-mentioned danger will occur, but if the operation of the apparatus is stopped during copying, paper will remain in the apparatus.

This may cause paper jams, etc.

[Purpose of the invention]

In view of the above-mentioned drawbacks of the conventional art, the present invention provides an image forming apparatus which copies an image written on a blackboard and also copies an original, without causing damage to the original table etc. when copying the original. The purpose is to provide

[Key points of the invention]

In order to achieve the above object, the present invention includes a display section having a writable and erasable display surface, a display section that is detachable from the display section, and a display section that selectively displays a document placed on a document table. In an image forming apparatus for copying, a copying section includes a photoconductor for forming an electrostatic latent image corresponding to the display surface or the document, a static eliminating means for removing unnecessary charges on the surface of the photoconductor, and and a detection means for confirming movement of the copying section, and when the detection means detects movement of the copying section during the copying operation of the document, the charge eliminating means is activated to perform the copying operation.

[Embodiments of the invention]

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

2 and 3 are perspective views showing the overall configuration of an image forming apparatus according to an embodiment of the present invention, and FIG. 2 shows a board copying state.
FIG. 3 each shows the original copying state.

In the same figure, two image forming apparatuses are composed of J-+'g+(1) and a copying section 2, and the board section 1 is composed of a frame la, a board sheet 3, and an operation section 4. It has an optical system and a winding device.Copying section 2
A document table 2a including a document cover is provided on the upper part, and the copying section 2 is mounted on a moving rail to be described later and is configured to be movable forward and backward.

When copying or placing an original under the original cover, move the copying section 2 forward as shown in Figure 3, and when copying an image on the board sheet 3, move it forward as shown in Figure 2. The copying section 2 is then retracted and used.

When copying the image on the board sheet 3, although not shown, the image on the board sheet 3 is irradiated with light within the frame la, and the optical path of the reflected light enters from the exposure opening described later at a predetermined position of the copying section 2. It's structured like this.

The document table 2a of the copying section 2 is composed of a document glass, a document cover, etc., and the document table 2a reciprocates in the direction of the arrow when copying a document. 1 (aj, fbl are views showing the right side of the above-mentioned image forming apparatus, and in the same figure (al is a state in which the copying section 2 is fully extended, that is, the state shown in FIG. 3). The same figure (bl
indicates that the copying unit 2 is in a halfway state where it cannot move completely forward or backward. In addition, Figure 1 (a
t, (bl is for ease of explanation of the movement of the copying unit 2, the frame 1a is omitted. FIG. 2(a).

In (b), the fixed rail 6 is fixed to the part 1 of the bow 1 by a mechanism not shown, and the fixed rail 6 is provided with four rotatable rollers 7 on each of the upper and lower sides. The movable rail 8 is configured to be slidable on the fixed rail 6 via the rollers 7, and a magnet 9 is attached to the rear end of the lower surface of the movable rail 8. On the other hand, two reed switches 10a are provided on the top surface of one unit 5.

10b is attached, and the reed switch 10a is attached at a position on the stand 5 directly below the position where the magnet 9 on the lower surface of the moving rail 8 moves and stops when the above-mentioned copying section 2 moves completely backwards. The reed switch 10b is installed at a position on the stand 5 directly below the position where the magnet 9 moves and stops when the copying unit 2 reaches the position shown in the same figure (al).

In other words, the reed switch 1 is provided directly below the magnet 9 when the board is in the normal state of copying, and the reed switch 1 is provided directly below the magnet 9 when the original is in the normal state of copying.
Ob is provided. This reed switch ioa, 1
0b is turned on when the magnet 9 is positioned directly above each of them, and outputs an electrostatic latent image signal for a copying operation, which will be described later.

FIG. 4 is a diagram showing the internal configuration of the copying section 2. As shown in FIG. When copying an original (not shown) placed on a normal original glass 27, the original is irradiated with light from the light source 27a, and the reflected light from the original is passed through the first copying mirror 27b and the copying lens. 27c
, the photosensitive surface 12 of the photosensitive drum 11 is irradiated (exposed) via the second mirror 27d for copying. At this time, the photosensitive surface 12 has been given a uniform electric charge in advance by the charger 13, the non-image portion is neutralized by the static elimination lamp 14, and an electrostatic latent image is formed on the photosensitive surface 12 by the above-mentioned exposure. Ru. The electrostatic latent image formed on the photosensitive surface 12 is visualized by the developing device 16 and separated into a 1-toner image.The electrostatic latent image formed on the photosensitive surface 12 is transferred from the paper feed cassette 18 to the leading edge of the 1-toner image by the transfer device 17. Paper feed roller 19. The image is transferred onto the transfer paper sent via the standby roller 20. The transferred 1-toner image on the transfer paper is thermally fixed by a fixing device 21 and then discharged to the outside of the machine by a paper discharge roller 22. 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, below the original glass 6, the casing 2b of the copying section 2 is provided with an exposure aperture 24 for board copying (hereinafter referred to as exposure aperture) and an exposure aperture 25 for original copying. A shutter 26 is provided to prevent outside light from entering the machine.

In addition, there is a standby switch on the general feed path 30 (of the transfer paper) to confirm the passage of the transfer paper and to discharge the transfer paper. Ifl J
A paper ejection switch 31 is provided to constantly check whether the transfer paper is passing or being ejected.

- The control circuit of the image forming apparatus having the above-mentioned mechanism is
The circuit configuration is shown in FIG. 5, and the circuit of one example of the boat section is as follows.
”--the reed switch 10a.

10b, resistors R1, R2, and a board control section 54, one end of the reed switch 10a, 10b is connected to the power supply (VcC
), and the other end is connected to a resistor RI.

It is grounded via R2. Also, the connection point between the reed switch 10a and the resistor R2, and the reed switch 10b
The connection point between the resistor R1 and the resistor R1 is connected to the board control section 54. Resistors R1 and R2 are pull-down resistors for ensuring that the signal applied to the board control unit 54 is at 0 level, that is, the ground voltage.

When the copying section 2 is in the normal position in the board copying state or original copying state, the respective reed switches 10a and 1 are turned on.
Since 0b is turned on and one end is connected to the power supply VCC, the voltage level of the power supply V (C) is input to the board control unit 54.The hoard control unit 54 detects this voltage level and confirms that the copying unit 2 is operating normally. Furthermore, the output of the board control section 54 outputs control signals to the winding roller driving motor of the board seat 1-3.

On the other hand, the copying unit side circuit 2 includes a print switch 57, a document platen limit switch 58 . Standby Sui Nona 28. Paper ejection switch 31. Resistance R3, R4゜R”!ll, Rh,
It consists of a copy control section 59, a print switch 57. Document platen limit switch 58° standby switch 28. One end of the paper ejection switch 31 is connected to a power source (VCC), and the other end is grounded via resistors R3, Ra, R5, and R6, respectively.

Also, the connection point between the print switch 57 and the resistor R6.

Connection point between document platen limit switch '58 and resistor R5.

The connection point between the standby switch 28 and the resistor R4 and the connection point between the paper ejection switch 31 and the resistor R3 are connected to the copy control section 59, and each switch and sensor is turned on.

The off signal is input to the copy control section 59. Print switch 57 on the copy side. Document table limit switch 58, paper ejection switch 31. The standby switch 28 is turned on and off by
Move forward - 1 - switch 10a.

Similarly to the on/off state of 10b, the voltage level of the power supply vcc and the ground level (0 level) signal are applied to the copy control unit 59. The copy control unit 59 detects the level change of these signals and detects that the transfer paper is passing over the first aperture feed path 30 in FIG. 4, for example, if the standby switch 2B is on. It also detects that the print switch 57 has been pressed, that the document table has moved to the end of its movement, and that the paper has been ejected.

Furthermore, the output of the copy control unit 59 is transmitted to a copy drive motor 60. Clutch 61° Static elimination lamp 14
Outputs control signals to etc.

On the other hand, the board control section 54 and the copy control section 59 are connected to each other via an interface.

Human output of both data is being performed.

In the image forming apparatus of the present invention having the above configuration, when copying an image of an original placed on the original glass 27, the copying section 2 is moved forward as described above, and the copying unit 2 is moved forward as shown in FIG. Processing from -10 is carried out according to the flowchart.

First, it is determined whether the above-mentioned forward movement of the copying section 2 has been performed reliably, that is, whether the copying section 2 has been moved to the normal position based on the signal from the i switch 1 (lb) (step ST + ).This judgment (step S T + ) is made by the reed switch 10b as described above.
This is done by the signal level.

In other words, when the reed switch 10b is off, the copying section 2
has not been moved to the original copy position (No), the above-mentioned operation, that is, the judgment (step 5T1) is repeated until the normal position is detected. Also.

When the reed switch 10a is on, the normal copying state position is detected (YES) according to the first judgment (step ST+), so that the document copying, which will be described later, is performed at this time. If the original is set at the copying position, it is determined whether the print switch 57 has been turned on (step ST2).

When the print switch 57 is not turned on (No)
In this step, it is determined whether the original copy position is reached (step S
Repeat from I) again. If the print switch 57 is also turned on, the drive motor 60 is driven, the high voltage output is turned on, the static elimination lamp 14 is turned on, and the paper feeder r719 is rotated to send the transfer paper onto the conveyance path (step ST3).
). Thereafter, it is determined whether or not the standby switch 28 has been turned on for the transfer paper sent out onto the first general feeding path (step ST a
)do. If it is off (no), this judgment (step S Ta) is repeated. If the standby switch 28 is turned on, the judgment (step ST4) becomes YES,
The static elimination lamp 14 is turned off, the exposure lamp is turned on, and forward scanning of the document table is started (Sr1).

Next, when the document table moves and the leading edge of the document reaches the position of the document copying exposure opening 25, a timing switch (not shown) provided in the operation path of the document table is activated and receives this timing signal. Then, it is determined that there is a timing signal (YES in step ST6), the standby roll 20 is driven (step 5Tv), and the transfer paper is conveyed toward the transfer device 17.

A transfer operation is started by this conveyance, and the original image is transferred onto the transfer paper.

In the board control unit 54, the read sensor 10b is activated during the copying operation.
In the normal state (step STe is YES), the transfer paper passes through the standby switch 28, and the copying section 2 is in the original copying position (step 5Te). To determine whether it has been turned off (Step 5T9), turn off the standby switch 28 (
Step ST9 is YES), the document table is stopped, the exposure lamp 27a is turned off, the static elimination lamp 14 is turned on (step ST+o), and the document table starts to move backward (step ST
'++). Here, if step ST9 is no,
It is determined whether the original platen limit switch 58 is on (step 5TI2), and if the original platen limit switch 58 is on (step 5T12 is YES), the movement of the original platen is stopped.

The exposure lamp 27a is turned off and the determination is made again (step 5Te).

On the other hand, if the copying section 2 moves backward for some reason and deviates from the copying position, the output of the reed switch IOb indicates that the copying section 2 is not at the original copying position (step S T s is NO), a branch of the flowchart. 2, the exposure lamp 27a is immediately turned off, and the static elimination lamp 14 is turned off.
Turn on step 7 ST+a), stop the document table, turn off the high voltage output step 5T15), judge whether the transfer paper has been ejected step 5T15), stop the drive motor 60, and turn off the static elimination lamp 14. (Step ST+t)
.

As a result of this operation, if it is confirmed with the reed switch 10b that the copying section 2 has moved during copying, the dew source lamp 2a is immediately turned on.
or lights out 2. Thereafter, the movement of the document table is also stopped, and the photosensitive drum 11 is no longer irradiated with light.

On the other hand, when the document table starts to retreat (step ST++), it is determined whether the number of copies is one or more (step ST+s
)do. If one copy is to be made (step S'r+e is NO), processing is performed to end the copying operation. First, it is determined whether the document table has definitely returned to the home position (step ST+s), and if it has returned, the document table is stopped, the high voltage output is turned off, and the static elimination lamp 14 is turned off (STEP 5T20). When it is determined that the ejection of the transfer paper is completed (step 5T21), the drive motor 60 is stopped (step 5T22). Furthermore, if the document table has not returned to the home position (step 5T19 is NO), the output of the reed switch 10b is used to determine whether the copying section 2 is located at the document copying position as described above (step 5T23). If so, the process returns to step ST1g and repeats this operation until the document table reaches the home position. If the document table is returning to the home position and is not at the document copying position (step 5T23 is NO), the process proceeds to step 5T15 described above, and step 5T15 is performed in the same manner as described above.
→ Perform the processing from step 5TIIl to step 5T17 to eject one sheet.

Prevent jams from occurring.

When copying multiple sheets of the original (step 5TIe is YES), perform the paper feeding start process again from paper feeding capacity level 18 (step 5T24), check whether the standby switch 28 is turned on (step 5T25), and turn on the standby switch. 28 is turned on (step 5T25 is YES), the standby roll 20 that is being driven to convey the previous transfer paper is stopped (step 5T26), and after determining whether the document table is at the home position (step 5T27). , if the manuscript table has returned to the home position (step ST2? is YES),
Stop the document table (step ST2+1), step ST
Returning to step 5, copying of the next transfer sheet is performed in the same manner as described above.

If the original platen is not at the home position (step 5T2)
7 is no).

That is, before returning to the home position, it is determined by the reed switch 10b whether or not the original copying position is present, that is, whether or not the copying section 2 is moving (step 5T29), and if it is moving (step ST2'!l is NO). , step S'I''+ according to branch 3 of the flowchart as described above.
5→Execute steps 5T16 and 5T17.

When the document table is at the home position (and at the document copying position (step 5T29 is YES), the judgment as to whether the standby switch is on is executed again (step 5T25), and the above-mentioned operation is carried out until the document table is at the home position. (step ST2? is YES).

As described above, in this embodiment, the magnet 9 and the read sensor 10b constantly detect whether or not the copying section 2 has moved completely forward while copying the document.
By copying the original image at a halfway position,
The document table 2a does not come into contact with the board section 1 and damage the document table 2a and the like.

(Effects of the Invention) As described in detail above, according to the present invention, when copying an original image, the copying unit does not move completely forward before copying is performed, and the original platen etc. In addition to preventing damage, even if the copying unit moves for some reason during copying and the copying operation is interrupted, the transfer paper itself is transported and taken out as usual, and the transfer paper remains in the device. This prevents paper jams and the like.

[Brief explanation of drawings]

FIGS. 1A and 1B are configuration diagrams showing the moving state of the copying section, which is the main part of the present invention. FIGS. 2 and 3 are perspective views of the image forming apparatus of the present invention. FIG. 4 is the copying section 5 is a circuit diagram of the image forming apparatus of the present invention. FIG. 6 is a flowchart. 1... Board section. 2... Copying section. 3... Board sheet. 9. ... Magnet. 10a, 10b... Reed switch. 54... Board control section. 59... Copy control section. Patent applicant Casio Computer Co., Ltd. Same as above
Casio Electronics Co., Ltd. cl -+N1
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Claims (1)

[Claims] In an image forming apparatus, a display unit has a display surface that can be written on and erased, and a display unit that is removable from the display unit and that selectively copies a document placed on a document table. The apparatus includes a photoreceptor that forms an electrostatic latent image corresponding to the display surface or the original, a static eliminating means that removes unnecessary charges on the surface of the photoreceptor, and a detection means that confirms movement of the copying section. death,
An image forming apparatus characterized in that when the detection means detects movement of the copying section during the copying operation of the original document, the static elimination means is activated to perform the copying operation.