JPS60147724A - Electronic copying machine - Google Patents

Abstract

PURPOSE:To form an original image over the whole area of a photosensitive body by fitting a means for forming an electrostatic latent image other than an original image on the photosensitive body so as to be moved in the approximately perpendicular direction to the moving direction of the photosensitive body. CONSTITUTION:A copying machine can form an electrostatic latent image other than the original image on a required position by moving a holder 44 of an LED array up to a proper position. When the holder 44 is moved while rotating a photosensitive drum 13, the image other than the original image can be formed so as to cross the copying machine obliquely. When only the holder 44 is moved without rotating the photosensitive drum 13, the image other than the original image can be formed in the direction perpendicular to the moving direction of the copying paper. Said constitution makes it possible to form the original image over the whole range of the photosensitive body.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electronic copying machine equipped with one stage for forming an electrostatic latent image other than an original image.

(b) Prior art As a photoconductor equipped with a means for forming an electrostatic latent image other than an original image, there is a method described in Japanese Patent Publication No. 58-24785 and Φ Japanese Patent Application Laid-Open No. 57774762. .

All of the methods described above form an electrostatic latent image other than the original image on the photoreceptor, but the former method reduces the exposure amount of the original image so that the electrostatic charges become approximately %. In other words, the potential of the latent image portion is controlled to drop from 700V to 350V, and an electrostatic latent image other than the original image is formed using the remaining amount of charge. Therefore, it was impossible to adjust the density of the image, and it could not be used as a copier, let alone a printer.

Furthermore, in the latter case, when only the original image is formed and no electrostatic latent image other than the original image is formed, this electrostatic latent image forming means is not operated and only the means for forming the original image is formed. This was done by running .

However, the electrostatic latent image forming means gets in the way, making it impossible to form an original image over the entire area of the photoreceptor.
I couldn't do a so-called full space copy.

(c) Purpose of the invention The present invention has been made in view of the drawbacks of the above-mentioned prior art.
When performing full space copying, the means for forming an electrostatic latent image other than the original image must be retracted to the outside of the photoreceptor area to create an electronic copying machine that can form the original image over the entire area of the photoreceptor. It is something to do.

(D) Structure of the Invention The present invention provides a means for forming an electrostatic latent image other than an original image on a photoreceptor, which is mounted so as to be movable in a substantially angular direction of degrees Celsius with respect to the moving direction of the photoreceptor. This electronic copying machine is characterized in that when projecting and forming an image on a photoreceptor, the electrostatic latent image forming means is retracted to the outside of the photoreceptor area.

(E) Embodiment FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention, and FIG. 2 is a plan view showing the display section thereof. In these figures, (1) is the copying machine main body;
) A document table (2) that can be moved left and right ( ) is slidably mounted on the upper surface of the document plate (a11).

(3) is the paper feeding power center where copy paper is loaded and stored; (4)
) is the paper output tray. Also, () on the operation panel (5)
6) is a numeric keypad for specifying the number of copies, and (7) is a selection key for printing selection used when selecting an image other than the original image (for example, date or company name). Display panel (8)
Above (9) is a 7-segment display element for displaying the number of copies, and (10) is a 7-segment display element for displaying designated print content by number.

FIG. 3 is a diagram showing the printed contents corresponding to the selection keys (7). In this figure - [, selection key (7)
The numbers above the ``...'' represent the printed content. Therefore, if the operator operates the selection key (7) of key number 5, for example, the date will be printed on the copy paper in addition to the original image. Similarly, by operating the selection key (7) with key number 8, the address will be printed. It is assumed that the print contents corresponding to each of the selection keys (7) are stored in advance in a read-only memory (ROM).

Figure 4 shows the selection key (7)... and this selection key (
7) is a diagram illustrating the correspondence with the contents printed on copy paper (IT) by operating . Figure 4 (A
), press the selection key (7) to change the key number from 3 to 4 to 5.
When the operations are performed in the order of →6 →8, the text as shown in the figure is printed on the right side (with respect to the direction of travel) of the copy paper (11). In addition, in FIG. 4(B), the selection key (
7) When the key numbers are operated in the order of 1 → 3 → 6 → 9 → 4, the text in English characters as shown in this figure will be printed on the right side of the copy paper (11). Ru. Furthermore, in Fig. 4(C), the selection key (7)... is selected with the key number 2.
- If you operate in the order of 10-7-11, copy paper (1
1) Vertical text as shown in this figure is printed on the right side.

Figure 5 is a sectional view showing the internal structure of the electronic copying machine, (2)
Copy #! A manuscript table made of a transparent glass plate is attached to the upper surface of the Jukyu body (1) so that it can be moved in the left and right directions, and a force /1-(12) is applied to the upper surface of this document table (2) so that it can be opened and closed. It has been recommended that it be installed. Almost in the center of the copying machine body 1),
A photoreceptor drum (13) whose circumferential surface is coated with a seven-layer silicone photoreceptor is rotatably mounted. On the top of the photoreceptor drum (13), there is a short focus lens array (14) for forming an image of the original placed on the document table (2) on the circumferential surface of the photoreceptor drum (13). ) are installed vertically. A monolithic light emitting guide array (14) is provided above the short focus lens row (14) for forming an electrostatic latent image other than the original image on the photoreceptor drum (13).
A LED array (hereinafter referred to as an LED array) (15) is provided. The detailed structure of this LED array (15> will be described later. Also, on the upstream side of the short focus lens row (14>), a photoreceptor drum (13) is 4-shirasu-charged (
A charging corotron (16) is fixedly installed for charging approximately aoov>, and above the charging corotron (16) is an exposure lamp (/10 gen lamp) for illuminating the document surface.
(17) is provided. '(Ig) is a filter of this exposure lamp (17). As a result, an electrostatic latent image of the original is formed on most of the surface of the photosensitive drum (13) by the mI charging corotron (16), the exposure lab (17), the short focus lens array (14), and the original. An electrostatic latent image other than the original image is formed on a part of the photosensitive drum (13) by the LED array (15).

A developing device (19) for developing the electrostatic latent image with toner is provided downstream of the short focus lens array (14). This developing device (19) stores a mixture (developer) of toner and carrier (20), and this developer (20) charges the magnet roller (21) with a negative charge toward the C1 photoreceptor drum (13). At this time, a spike (20) is formed on the part of the magnet roller (21) that faces the photoconductor drum (13), and the tip of this spike is connected to the photoconductor drum. (13)
The negatively charged toner is brought into contact with the electrostatic latent image formed with a positive charge, and the original image and other images are developed. Furthermore, (22)
is a blade that controls the height of the spikes of the developer (20).

A paper feed cassette (3) in which copy paper (11) is loaded and stored is removably attached to the right end of the copying machine main body. At the bottom of this paper feed cassette (3), copy paper <11
) is mounted on the support plate (23), and the base end of the support plate (23) is swingably attached to the inner bottom of the copying machine main body (1). An opening (25) is provided through which the free end of the pushed-up lever (24) can be inserted. The push-up lever (24) is equipped with a spring (not shown) that urges it to rotate clockwise.
The support plate (23) is urged upward by this spring. Above the downstream end of the paper feed cassette (3), there is a paper feed roller (
26) is provided, and the uppermost copy paper (11) is pushed up by the push-up lever (24) to this paper feed roller (26).
is pressed to the bottom of the

A paper feed cassette (
A pair of register rollers (27) (27) are installed to temporarily stop the copy paper (11) that has been completely fed from 3) and then feed it again in synchronization with the operation of the document table (2). It is being taken. 28 is a reflective photosensor that detects the presence or absence of copy paper (11).

A transfer corotron (29) for transferring the toner image developed by the developing device (19) onto copy paper (11) is provided at the lower end of the photosensitive drum (13). Further, downstream of the transfer corotron (29), a peeling corotron (30) for peeling the copy paper (11) from the photosensitive drum (13) is disposed adjacent to it.

On the downstream side of the peeling corotron (30), there is provided a 7-killam conveyor (31) for conveying the copy paper (11) on which the toner image has been transferred. The fixing device [
1 (32).

1. The fixing device (32) is composed of a heat roller (34) with a built-in heater (33) and a pressure roller (35) that is in pressure contact with the heat roller (34). 11) are these two rollers (34) (3
5) By being inserted between them, they are heated under pressure and fixed. (36) is an offset prevention claw that helps the fixed copy paper (11) to be offset from the heat roller (34). A pair of paper discharge rollers (37 bar 37) for discharging the fixed copy paper (11) is provided on the downstream side of the heat roller (34>). It is a detection switch that detects.

Above the vacuum conveyor (31), copy paper (1
1) is provided with a cleaning device (39) for removing toner that has not been completely transferred and remains on the photosensitive drum (13). This cleaning device (39) includes a cleaning blade (40) for scraping off residual toner on the photoreceptor drum (13), and a cleaning blade (40) for scraping off residual toner on the photoreceptor drum (13).
) to the toner storage box (41).
It is composed of a roller (42) that conveys the paper to the machine.

Then, the selection key (7) on the operation panel (5)...
After pressing the desired one of ・, placing the original on the original table (2) and pressing the start button (43) (Fig. 1), the original is exposed and scanned. 2
) moves to the left and then to the right, and during this movement to the right, the original is exposed and scanned, and the original image is transferred to the short focus lens row (14) on one photoreceptor drum (13). An electrostatic latent image corresponding to the original image is formed. ], the LErl array 15)... selectively emits light, and displays the content corresponding to the operated selection key (for example, day 1, etc.)
electrostatic latent images are simultaneously formed on the photoreceptor drum (13).

The document thus formed and the electrostatic latent image such as the wording selected by the selection key are developed with toner in a developing device (19). Then, this toner (I) is transferred by the transfer controller (29) onto the copy paper (11) that has been conveyed by the pair of register rollers (27) (27). The copy paper (11) is
After being peeled off from the photoreceptor drum (13) by a peeling corotron (30), it is transported to a fixing device (32) by a vacuum conveyor (31), and then heated by a heating roller (34) and a pressure roller (35). It will be established in The copy paper (11) fixed in this manner is transported to a pair of paper ejection rollers (37) (37).
) and is discharged onto the paper discharge tray (4) (Fig. 1).

Note that V is completely transferred to the copy paper (11), and the photoreceptor drum (
13) The toner remaining on the surface is removed by the cleaning device (
The photoreceptor drum (13) is cleaned in step 39), and a new positive charge is uniformly applied to the cleaned photoreceptor drum (13) in the charging flotron <16).

Next, the LED array (15) will be explained in detail. Figure 6 shows the LI that is slidably provided on the short focus lens array (14).
It is a perspective view showing an ICD array (15) and the like. In this figure, (44) is a holder that holds the LED array (15), and is mounted on the short focus lens row (14) so as to straddle this. A lead screw (45) extending parallel to the rotational axis of the photoreceptor drum (13) is inserted into the holder (44), and when the lead screw (45) rotates, the holder (44) partially screws up. move parallel to the axis of (45). (46) is a stepping morph for rotating the lead neck 45).

Note that the exposure lamp (17) is located on the side of the short focus lens array.

Figure 7 shows the LED array (15) and short focus lens array (14).
) is shown in a cross-sectional view taken in a direction perpendicular to the axis of the photoreceptor drum (13). In this figure, illustration of the holder (44) is omitted.

(47) is an alumina substrate to which the LED array (15) is fixed, and this alumina substrate (47) is fixed to an aluminum fixing base (48) which also serves as a radiation fin. Moreover, this fixing base (48) is attached to the holder (44).
(Fig. 6). π1 alumina substrate (4
7) Above, on the left and right of the LED array (15),
Driver IC (49) that drives the D array (15)
) (49> is fixed, and the °C flat cable (51) is connected via the connector (50). At the bottom of the fixing base (48) are the LEDs 7t and 15).
A transparent glass plate (52) is installed to protect the parts.

Figure 8 shows the LED array (15) and short focus lens array (14).
), and FIG. 9 is a perspective view showing the alumina substrate (47). FIG. 1θ is a partially enlarged view showing the LED array (15), in which (53), . . . are light emitting parts, and (54), . . . are electrodes. These electrodes (
54)... are connected to the pattern wiring (56) on the alumina substrate (47) via gold wires (55)... The size of each light emitting part in this LED array (15) is 0.07X O,08 (Ilfll), the overall length is 14.84 (11111>), and the pitch is O2O3 (m
1), and the number of dots is 128.

The LED array (15) is a red LED formed by mounting GaAs on a GaAsP base.
It is composed of the ED group, and the emission wavelength is approximately 6,600. Therefore, photoreceptors suitable for this purpose are limited to amorphous silicon having long wavelength characteristics, selenium having a high tellurium content, and the like. In this regard, if a green LED array (wavelength: 5650) is used, the range of types of photoreceptors that can be used with it will be expanded.

In Figure 7, TC is the conjugate length and Zo is the lens (14)
The length Ro represents the distance from the end surface of the lens (14) to the LED array (15) or photosensitive drum (13). The relationship between these dimensions and the wavelength of the LED is shown in the following table.

Note that a halogen lamp is used as the exposure lamp (17) for illuminating the surface of the document, and the center wavelength of this halogen lamp is approximately 5,500. Therefore green LE
The same short-focus lens array can be used for the D array and the halogen lamp, but the length of the lens used must be different for the red LED array and the halogen lamp, so the same short-focus lens array can be used for the red LED array and the halogen lamp. cannot be used.

FIG. 11 shows a state in which the LED array (15) has been moved to the outside of the short focus lens row (14), that is, the LED play (15) has been retracted to the outside of the area of the photoreceptor (13). It is a perspective view showing a state. In this state, an original image is formed over the entire area of the short focal length lens array (10), and so-called full space copying is possible.This state will be explained in detail along FIGS. In (A), the LED array (15) is connected to the short focus lens array (14).
) is located near the right end of Figure 12 (B
) shows a state in which the LED array (15) is located outside the right side of the short focus lens row (14).

In the state shown in FIG. 12(A), the holder 44 is located above the portion of the photoreceptor where the electrostatic latent image 1 Sanyo other than the original image is formed, so the original image in that portion is The CDJ is not projected and imaged onto the photoreceptor drum (13), therefore,
Other than the original image formed by the original image 'ABJ' and the LED array (15), an image "Sanyo" is formed as an electrostatic latent image. On the other hand, in the state shown in FIG. 12(B), the LE
Since the D array (15) does not exist on the short focus lens row (14), the entire tenor original image 'ABJrCDJ is projected and imaged on the photoreceptor drum A (13), but the electrostatic charge other than the original image No latent image is formed. Therefore, a full space copy can be made.

Figure 13 shows an LED sliding on the short focus lens array (14).
Holder (44a) (44) of array (158) (15b)
This shows an example in which there are two b), and in this way L
When a plurality of ED arrays (15g) (15b) are provided, a plurality of electrostatic latent images other than the original image can be formed in parallel (see FIGS. 17(E) and 17(F)). It is assumed that the lead screw (45) in this embodiment has a reverse thread formed from the center. Furthermore, by moving the holder (44) to an appropriate position, an electrostatic latent image other than the original image can be formed at a desired position.

In this case, when the holder (44) is moved while rotating the photosensitive drum (13), images other than the original image are transferred to the copy paper (
11) can be formed diagonally across. In addition, the holder (
44), an image other than the original image can be formed on the copy paper (11) in a direction perpendicular to the moving direction. In addition, when performing full space copying according to this embodiment, the holders (44a) and (44b) may be positioned at the left and right ends of the lead screw (45).

FIG. 14 is a perspective view showing an embodiment in which an LED array (15) is provided on the side of a short focus lens array (14) for projecting and forming a document image. In this figure, the holder (44) blocks light from a portion of the photoreceptor drum (13) that corresponds to a portion on which an electrostatic latent image is formed other than the document image.

Furthermore, an LED array (15) and a dedicated short focus lens array (58) for projecting and forming an image formed by the LED array (15) are fixedly mounted on the holder (44). By providing the dedicated short focus lens array (58) in this way, the LED array (15) can be brought closer to the photosensitive drum (13), and the height of the holder (44) can be lowered. I can do it.

FIG. 15 is a perspective view showing another embodiment of the developing device (19) shown in FIG. Toner other than black (for example, brown toner) is stored in the portion corresponding to . In this figure, (21a) is a magnet roller for forming an original image, and (21b> is a magnet roller for forming an image other than the original image. When such a developing device (19) is used, copy paper (11 ), the original image is copied in black, and images other than the original image, such as the date, are printed in a color other than black (for example, brown).
In this example, when making a full space copy, the area containing brown toner is placed on the photoreceptor drum (
13) It is necessary to move it to the outside parallel to the axis of rotation.

FIG. 16 is a block diagram showing the control circuit. In this figure, the circuit configuration of the entire electronic copying machine is omitted, and only the circuit configuration for forming images other than the original image is shown. In order to form an image other than the original image, it is first necessary to operate the selection key (7) corresponding to the desired image other than the original image. Then, the central processing unit (CPU
) (6G) allows read-only memory (ROM
> (61), the information corresponding to the image other than the original image is transferred to the read/write memory (RAM) (62),
Furthermore, in synchronization with the operation of the electronic copying machine, (RAM>(
The information in 62) is transferred to the pattern generator (63). The LED driver (64) is driven and controlled by the pattern generator (63), and the monolithic LED array (15) is selectively and repeatedly blinked by the LED driver (64) to form a desired image. Note that the first display (65) indicates the operating status of the electronic copying machine and the order in which images other than the original image are formed.
The mechanism control section (66) controls the entire operation of the electronic copying machine.

FIGS. 17A to 17P are plan views showing different embodiments of copy sheets on which images other than original images are formed according to embodiments of the present invention.

FIG. 17(A) shows the letters ``At'' formed in white on a black background, and FIG. 17(B) shows the letters ``Al'' formed in black letters on a white background.

Normally, when printing is performed using an LED array in a printer or the like, black printing is formed only in the portion corresponding to the light emitting part of the LED by performing reversal development. However, in the case of an electronic copying machine, when reverse development is performed, the black and white of the original image is also reversed, which causes a problem. Therefore, in the case of the present invention, when forming white characters etc., it is sufficient to make the LED array emit light corresponding to the characters, but when forming ordinary characters, it is sufficient to make the LED array emit light corresponding to the back ground. It is necessary to make the LED array emit light.

FIG. 17(C) shows an example in which the company name is printed on the left end, and FIG. 17(D) shows an example in which the LED array is moved and the postal code is printed horizontally in the center.

Fig. 17 (E) shows an example of printing the company name and location name near both sides of the copy paper using two LED arrays, and Fig. 17 (F) shows an example in which the company name and location name are printed near both edges of the copy paper, and Fig. 17 (F) shows them differently from the above. An example of what is printed at the position is shown below.

Figures 17 (G) and (H) show examples of patterns other than letters formed near the right edge, and Figure 17 (1) shows a combination of vertically written characters and horizontally written characters near the right edge. An example of what is printed is shown below.

FIG. 17(J) shows an example of printing near the right edge of copy paper of various sizes.

Figure 17 (K), (L), and (M>) show examples of printing with the electronic copying machine operating at different copying speeds; (K) is the one printed at the slowest speed, and (M) is the one printed at the highest speed. An example is shown.

FIG. 17(N) shows an example with a frame, and FIG. 17(0) shows an example with a scale attached near the right end.

FIG. 17(P) shows an example in which printing is started from a position p apart from the leading edge of the copy paper.

(f) Effects of the Invention In the present invention, a means for forming an electrostatic latent image other than an original image on a photoreceptor is mounted so as to be movable in a direction substantially perpendicular to the moving direction of the photoreceptor, and only the original image is exposed to light. When projecting an image onto a body, the electrostatic latent image forming means is retracted to the outside of the photoreceptor area. Space copy is possible.

Further, a means for projecting and forming an original image on the surface of the photoreceptor is formed by a short focus lens array, and an electrostatic latent image forming means other than the original image is provided movably along the short focus lens array. If there is, the electrostatic latent image forming means can be easily retracted with a simple structure.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention, and FIG. 1 is an external perspective view, FIG. 2 is a plan view showing the display section, FIG. 3 is a view showing the inside of the print corresponding to the selection key, and FIG. 5 is a sectional view showing the internal structure of the electronic copying machine, FIG. 6 is a perspective view showing the short focus lens array and the LED array, and FIG. The figure is a cross-sectional view showing a short focus lens row and an LED array, and FIG.
Figure 9 is a perspective view showing the alumina substrate, Figure 10 is a partially enlarged view showing the LED array, and Figure 11 shows the LED array outside the short focus lens array. FIG. 12 is a perspective view showing the state in which it has been moved up to
＞(B) is a perspective view showing different states of the holder of the LED array, FIG. 13 is a perspective view showing still another embodiment of the LED array, and FIG. 14 is a perspective view showing still another embodiment of the LED array. 15 is a perspective view showing another embodiment of the developing device, and FIG. 16 is a block diagram showing the control circuit.
FIGS. 7A to 7P are plan views showing copy sheets on which images other than original images are formed. (1)...Copy machine body, (2)...Document stand, (13
)...Photoreceptor drum, (10...Short focus lens array, (
15)-LED array, (19)...Developing device, (4
4)...LEr) array holder, (45)...lead wire, (48)...stepping motor. Applicant Sanyo Electric Co., Ltd. Agent Patent Attorney Shizuo Sano Figure 7. Figure 9 Figure 10 ε+'z17171 1Al! B) tel cD
) IE) IFI Figure 1 “1 LG) tH+ +Ir cJ+ IKJ 4m!148kB3

Claims (1)

[Scope of Claims] 1. An original image is projected and formed on the surface of a uniformly charged photoreceptor to form an electrostatic latent image, and this electrostatic latent image is developed with toner. In the copying machine, a means for forming an electrostatic latent image other than the original image on the photoreceptor is mounted so as to be movable in a direction approximately at an angle of -CC with respect to the moving direction of the photoreceptor, and forms only the original image. When projecting and forming an image on the photoreceptor, R
An electronic copying machine characterized by 2-, in which the electrostatic latent image forming means described in ++ is retracted to the outside of the photoreceptor area. 2. Means for projecting and forming an original image on the surface of a photoreceptor is formed by a short focus lens array, and an electrostatic latent image forming means other than the original image is provided movably along the short focus lens array. An electronic copying machine according to claim 1.