JPS60164736A - Electronic copying machine - Google Patents

Abstract

PURPOSE:To form clearly an electrostatic latent image except an original image, on a photosensitive body, and to make the titled copying machine function sufficiently as a copying machine, too, by providing a means for forming an electrostatic latent image except an original image on a photosensitive body, and providing a means for preventing the original image from being projected and forming an image, on its part. CONSTITUTION:A holder 44 for holding an LED array 15 is installed onto a short focus lens train 14 so as to stride over it. The holder 44 is in the upper part of a part in which an electrostatic latent image ''Sanyo'' except an original image is formed, on a photosensitive body, therefore, an original image ''CD'' of its part is not projected nor made to form an image an a photosensitive drum 13. Accordingly, ''AB'' being the original image and the image ''Sanyo'' except the original image, formed by the LED array 15 are formed as an electrostatic latent image.

Description

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

(B) Prior art As a photoreceptor equipped with a means for forming an electrostatic latent image other than an original image, there are those described in Japanese Patent Publication No. 5G-24785 and Japanese Patent Application Laid-open No. 74762-1982. .

All of the methods described above form an electrostatic latent image other than the original image on the photoreceptor, but the method described in the former method reduces the exposure amount of the original image so that the electrostatic charge becomes approximately That is, the potential of the latent image portion is controlled to be lowered from 700 V to 350 V, and an electrostatic latent image other than the original image is formed using the remaining amount of charge. Therefore, it is impossible to adjust the image density,
Although it could be used as a printer, it could not be used as a copier.

◆ 2- Furthermore, the latter only describes the basic configuration of the present invention, and does not disclose specific means for forming images other than the original image.

(C) Purpose of the Invention The present invention aims to realize an electronic copying machine that can clearly form an electrostatic latent image other than an original image on a photoreceptor and can function satisfactorily as a copying machine. The image is constructed so that it is always formed at a desired position even if the dimensions of the copy sheet vary.

(D) Structure of the Invention The present invention is provided with a means for forming an electrostatic latent image other than the original image on the photoreceptor, and a portion of the photoreceptor where the electrostatic latent image other than the original image can be formed. , an electronic copying machine characterized by being provided with means for preventing a document image from being projected and formed.

(E) Embodiment FIG. 1 is a perspective view showing the external 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 body A4, and on the top surface of this copying machine body A4, an original S stand (2) that can be moved from side to side is slidably attached. ).

(3) is a paper feed cassette in which copy paper is stored.
4) is a paper output tray. Also, (6) on the operation panel (5) is a numeric keypad for specifying the number of copies, and (7) is a print selection key used when selecting images other than the original image (for example, date or company name). This is a selection key. Display panel (8
9) above is a 7-segment display element that displays the number of copies, and (1o) is the specified figure 3.
7) is a diagram showing printed content corresponding to . . . . In this figure, the numbers attached above the selection keys (7) represent the printed contents. 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, if the selection key <7 of key number 8 is operated, the address will be printed. It is assumed that the print contents corresponding to each of the selections -4 to key (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 showing the correspondence with the contents that can be printed on the copy paper (11) by operating. Figure 4 (A>
, press the selection key (7)... as the key number changes from 3 → 4 →
When the operations are performed in the order of 5 → 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 Figure 4 (B), the selection key (7) When the key numbers are operated in the order of 1 → 3-6 → 9 → 4, on the right side of the copy paper (11) there will be a message with English characters as shown in the figure 2-. is printed.Furthermore, in Fig. 4(C), press the selection key (7) when the key number is 2.
→ If you operate in the order of 10 → 7 → 11, copy paper (1
Vertical text as shown in this figure is printed on the right side of 1).

Figure 5 is a sectional view showing the internal structure of the electronic copying machine, (2)
is a document stand made of a transparent glass plate that is movably attached to the top surface of the copying machine body (1) in the left and right direction, and a cover (12
) is attached so that it can be opened and closed freely. A photoreceptor drum (13) whose circumferential surface is coated with an amorphous silicon photoreceptor is rotatably mounted approximately in the center of the copying machine body (1).On the top of the photoreceptor drum (13) ,
A short focus lens array (14) is provided vertically for forming an image of a document placed on a document table (2) on the circumferential surface of the photosensitive drum 1-(13). This short focus lens array (1
4) A monolithic light emitting diode array (hereinafter referred to as an LED array) (15) is installed in the upper part of the photoconductor drum (13) to form an electrostatic latent image other than the original image.
is provided. Note that the detailed configuration of this LED array (15) will be described later. Furthermore, a charging corotron (16) for uniformly positively charging (approximately 600 V) the photoreceptor drum (13) is fixedly installed upstream of the short focus lens row (14). 16
) is provided with an exposure lamp (halogen lamp) (17) for illuminating the surface of the document. (18) is a filter of this exposure lamp (17). Therefore, the front-6 = charging corotron (16), exposure lamp (17L short focus lens array (14), and photoreceptor drum (13)
) an electrostatic latent image of the document is formed on most of the surface of the L
An electrostatic latent image other than the original image is formed on a portion of the photoreceptor drum (13) by the ED 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) is negatively charged toward the photoreceptor drum (13) by a magnet roller (21). It was transported in pieces. At this time, spikes of the developer (20) are formed on the portion of the magnet roller (21) facing the photoreceptor drum (13), and the tip of the developer (20) comes into contact with the photoreceptor drum (13). The negatively charged toner adheres to the electrostatic latent image formed with a positive charge, and the original image and other images are developed. Note that (22) is a blade that controls the height of the spikes of the developer (20).

7- 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 body (1). An opening (25) is provided through which the free end of the bar (24) can be inserted. A spring (not shown) is attached to the push-up lever (24) to urge it to rotate clockwise, and the support plate (23) is pushed upward by this spring. A paper feed roller (26) is provided above near the downstream end of the paper feed cassette (3) to feed copy paper (11) one by one, and the top copy paper (11) is This paper feed roller (26) is moved by the push-up lever (24).
) is pressure-welded to the bottom of the Note that the paper feed cassette (
3) is provided with means for displaying the size of the copy paper (11) stored in this, and if B5 copy paper (11>) is stored in this paper feed cassette (3), 8, a signal to that effect is output to the copying machine main body (1).
-

A paper feed cassette (26) is located downstream of the paper feed roller (26).
A pair of register rollers (27) (27) are provided for once stopping the copy paper (11) fed from the document platen (2) and then feeding it again in synchronization with the operation of the document table (2). It is being (28) is a reflective photosensor that detects the presence or absence of copy paper (11).

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

A vacuum conveyor (31) for conveying the copy paper (11) on which the toner image has been transferred is provided downstream of the peeling corotron (30). The fixing device (
32>.

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 rollers (34) (35)
) and is heated under pressure and fixed. 36) is an offset prevention claw that prevents the fixed copy paper (11) from being offset to the heat roller (34). A pair of paper rollers (37) (37) for discharging the fixed copy paper (11) is provided downstream of the heat roller (34). (38) is a detection switch that detects copy paper (11).

Above the vacuum conveyor (31), copy paper (1
A cleaning device (39>) is provided for removing toner that has not been completely transferred to the photoreceptor drum (13) and remains on the photoreceptor drum (13). A cleaning blade (40) that scrapes off residual toner;
) to the toner storage box (41).
It consists of a roller (42) that conveys the

Therefore, the selection key (7) 10 on the operation panel <5>
- After pressing the desired one, place the original on the original platen (2) and press the start button (43) (Fig. 1) to perform exposure scanning of the original. In other words, the manuscript table (
2) once moves to the left and then moves to the right, and during this movement to the right, the original is exposed and scanned, and the original image is transferred to the photoreceptor drum <13 by the short focal length lens array (14). ) to form an electrostatic latent image corresponding to the original image. At this time, the LED array (15) selectively emits light, and an electrostatic latent image of content (for example, date, etc.) corresponding to the operated selection key is simultaneously formed on the photoreceptor drum (13).

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

Note that the photosensitive drum (11) was not completely transferred to the copy paper (11)
13) The toner remaining on the surface is removed by the cleaning device (
39), and the cleaned photosensitive drum (13) is uniformly newly charged with a positive charge by the charging corotron (16).

Next, the LED array (15) will be explained in detail. Figure 6 shows an LE that is slidably provided on the short focus lens array 14).
It is a perspective view showing a D 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. This holder (44) has a lead screw (44) extending parallel to the rotational axis of the photoreceptor drum (13).
When the lead screw (45) is inserted and the lead screw (45) is rotated, the holder (44) moves parallel to the axis of the lead screw (45). (46) is a stepping motor for rotating the lead screw (45).

This stepping motor (46) has an encoder (6
7) is attached, and the movement amount and stop position of the holder (44) are detected by this. 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. 48) is the said boulder <44)
(Fig. 6). The alumina substrate (47
), these LEDs are placed on the left and right of the LED array (15).
Driver IC (49>) that drives the array (15)
(49) is fixed, and a flat cable (51) is connected via a connector (50). A transparent glass plate (52) for protecting the LED play (15) and the like is attached to the lower part of the fixing base (48). Figure 8 13
- is a partially sectional perspective view showing the LED array (15) and the short focus lens array 14〉, and FIG.
) is a perspective view showing the. Figure 10 shows the LED array (15
), in which (53)... are light emitting parts, and (54)... are electrodes. These electrodes (54
)... is an alumina substrate (
47> is connected to the pattern wiring (56) above. The size of each light emitting part in this LED array (15) is 0
．． 07X 0.08 (mIll), the total length is 14
．． 84 (ml11), pitch is 0.106 (Ilff
ll>, 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 with long wavelength characteristics and selenium with a high tellurium content. In Fig. 7, TC is the conjugate length and zO is the length of the lens 14- S, no is LE from the end surface of the lens (14)
It represents the distance to the D array (15) or the 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) that illuminates the document surface, and the center wavelength of this halogen lamp is around 5500. Therefore, the green LE
The same short focus lens array can be used for the D array and the halogen lamp, but the length of the lenses used must be different for the red LED array and the halogen lamp, so the same short focus lens array ( 14) cannot be used.

FIG. 11 is a perspective view showing the LED array (15) moved to the outside of the short focus lens array (14). In this state, the original image is formed over the entire area of the short focus lens array (14). This state is the first
When detailed in accordance with Figures 2 (A) and (B), Figure 12 (
In A), the LED array (15) is connected to the short focus lens array (14)
Fig. 12 (B) shows the state where it is located near the right end of
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 photoconductor where the electrostatic latent image "Sanyo" other than the original image is formed, so the original image of that portion is The CDJ is not projected and imaged onto the photoreceptor drum (13), h.Therefore, the original image ``Image 1 Sanyo'' other than the original image formed by ABJ and the LED array (15) is formed as an electrostatic latent image. be done. On the other hand, in the state shown in FIG. 12(B), L
Since the ED array (15) does not exist on the short focus lens row (14), the entire tenor original image 'A B J ' CD J can be projected onto the photoreceptor drum (13), but the original image No other electrostatic latent image is formed.

FIGS. 13(A) and 13(B) show that only the original image can be projected onto the photosensitive drum (13) without moving the LED array (15) in the direction of the rotation axis of the photosensitive drum (13). It is a perspective view showing an example. In this embodiment, the holder (44) is configured to be able to be opened and closed at its upper end;
When forming an image other than the original image 1, the LED array (15) is located above near one end of the short focus lens array (14), as shown in FIG. 13(A). In this case, the portion of the photoreceptor drum (13) that is shielded from light by the holder (44) and faces the LED array (15) includes:
The original image is not projected.

Furthermore, if it is desired to project and form the entire original image onto the photosensitive drum (13), an LED array (15) of the holder (44) is provided as shown in FIG. 13(B). One side wall may be rotated using the lower end as a fulcrum.

Then, the entire upper part of the short focus lens array (14) is opened, and all original images 'ABJ'C17-D' are projected onto the photoreceptor drum (13).

FIGS. 14(A) and 14(B) show still another embodiment similar to the embodiment shown in FIG. 13. In this embodiment, the LED array (15) is mounted on a holder (44).
It is fixed to the lower surface of a lid (57) which is attached to the upper part of the lid body (57) so as to be openable and closable. When forming an image other than the original image, the lid (57) is opened as shown in FIG. 14(A).
When the cover is closed and only the original image is to be projected and imaged, the lid (57) may be opened as shown in FIG. 14(B).

Figure 15 shows an LED sliding on the short focus lens array (14).
Holders (44a) (44) of arrays (15a) (15b)
This shows an example in which there are two b), and in this way L
When a plurality of ED arrays 4 (15a) (15b) are provided, a plurality of electrostatic latent images other than the original image can be formed in parallel (see FIGS. 22(E) and 22(F)). Also, 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, rotate the photoreceptor drum (13).
When the 8-fold holder (44) is moved, images other than the original image can be
It can be formed diagonally across the copy paper (11). Further, by moving only the holder <44) without rotating the photosensitive drum (13), an image other than the original image can be formed on the copy paper (11) in a direction perpendicular to the moving direction.

FIG. 16 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 an original 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 installed on this holder (44).

FIG. 17 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, the copy paper (11) ), the original image is completely copied in black, and images other than the original image, such as the date, are black and printed in a different color (for example, brown).In this example, brown toner is used. Since it is difficult to move the part in which the photosensitive drum (13) is housed parallel to the rotational axis of the photosensitive drum (13), it is difficult to move the position where images other than the brown original image are formed.

FIG. 18 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. If you erase images other than the original image, the central processing unit (
The read-only memory (R
The information corresponding to images other than the original image is transferred from OM>(61) to the read/write memory (RAM>(62)), and further synchronized with the operation of the electronic copying machine, the information is transferred to the read/write memory (RAM)(62).
The information in 2) is transferred to the pattern generator (63).

The LED driver (64) is driven and controlled by this pattern generator (63), and this LED driver (
64), the monolithic LED array (15) selectively repeats blinking to form a desired image. The 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.

Further, (68) is a motor control unit that controls the stepping motor (46), and when the copy paper size is detected by the signal from the paper feed cassette (3), the LED array (15) is set to correspond to the size. The stepping motor (46) is driven so that the amount of movement is the same. The amount of movement and stop position of the LED array (15) are determined by the encoder (67). This is a flowchart showing a process of changing the position of the image, and this process will be explained below based on this flowchart.

First, the paper size of the copy paper (11) is detected, and then it is determined whether an image other than the original image is to be formed on the copy paper (11), that is, whether there is partial printing. "
If it is determined that the LED array (15) is present, it can be detected whether the LED array (15) is at the reference position or not. In addition, ■, ED array (
Whether or not the lead screw (15) is at the reference position is determined by the lead screw (4).
5) can be detected by the reference position detection switch (not shown) provided in the figure. If the LED array (15) is not at the reference position, the stepping motor (46) rotates to move the LED array (15) to the reference position. Then, when it is detected that the stepping motor (46) has stopped at the reference position, the size of the copy paper (11) is determined.
If it is determined that the size is 5, the counter (not shown) is set to CI, and the stepping motor (4) is set to CI.
6)) Count detection value E of Y padder (67) is CI
Continue rotating until =22- becomes the same as -. Then, when the stepping motor (46) stops rotating when E=C1, the LED array (15)
It will stop at a position corresponding to the right (illll end) of 1). Therefore, in this state, if you operate the selection key (7) appropriately and press the start button (43) (Fig. 1) , an image other than the original image, that is, a desired wording, is formed near the right end of the B5 size copy paper (11), as shown in the display section 'B5J' in FIG. 20(J).

Similarly, when it is determined that the copy paper (11) is of A4 size, the value C2 of the counter is changed to the encoder (
67), and the stepping motor (46) rotates until C2=E. Then, the desired wording is formed near the right edge of the A4 size copy paper (11) so that "A4" is finally displayed in FIG. 20 (J).

Similarly, when it is determined that the copy paper <11) is of B4 size, the desired wording is formed so that "B4" □ is displayed in FIG. 20 (J).

FIGS. 20(A) to 20(P) 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.

Figure 20 (A) shows the letters "A1." written in white on a black background, and Figure 20 (B) shows the letters "A1." written in black on a white background.
A1" is formed.

When printing with an LED array in a printer or the like, a black print is usually formed only on 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 fine to emit light from the LED array in accordance with the characters, but when forming ordinary characters, it is necessary to emit light from the LED array. An example is shown in which the postal code is printed horizontally in the center by causing the LED array to emit light.

Fig. 20 (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. 20 (F) shows an example of printing the company name and location name near both sides of the copy paper. An example of what is printed at the position is shown below.

Figures 20 (G) and (H) show examples of patterns other than letters formed near the right edge, and Figure 20 (I) 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. 20(J) is as described above.

Figure 20 (K), (L), and (M>) show examples of printing by changing the copying speed of the electronic copying machine, (K) is the slowest speed, and (M) is the fastest speed. It shows examples of things.

FIG. 20(N) shows an example with a frame, and FIG. 20(0) shows an example with a scale near the right end.

FIG. 20(P) shows an example in which printing is started from a position ρ apart from the leading edge of the copy paper.

25- (F) Effects of the Invention The present invention includes a means for detecting the dimensions of copy paper and a means for moving the formation position of an image other than the original image in accordance with the dimension detected by the detecting means. Therefore, no matter what size copy paper is loaded, an image other than the original image can always be clearly formed at the desired position.

[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.
FIG. 9 is a perspective view showing the alumina substrate, FIG. 10 is a partially enlarged view showing the LED array, and FIG. 11 shows the LED array moved to the outside of the short focus lens array. 12(A) and 12(B) are perspective views showing different states of the LED array holder, and FIG. 13(A) and (B) are perspective views showing the LED array holder in a different state.
Perspective views showing different states of D array, FIG. 14(A)
(B) is a perspective view showing different states of another embodiment;
FIG. 5 is a perspective view showing still another embodiment of the LED array, FIG. 16 is a perspective view showing still another embodiment of the LED array,
FIG. 17 is a perspective view showing another embodiment of the developing device;
FIG. 19 is a block diagram showing a control circuit, FIG. 19 is a flowchart, and FIGS. 20(A) to 20(P) are plan views showing a copy sheet on which an image other than the original image has been formed. (1>...copying machine body, (2)...document stand, (3)
... Paper feed cassette, (13) ... Photoreceptor drum, (
14)...Short focus lens array, (15)...LED array, (19)...Developing device! , (29)...Corotron for transcription, (46)...Stepping motor,
(67)...Encoder. Applicant Sanyo Electric Co., Ltd. Agent Patent Attorney Shizuo Sano 27 = Figure 1. Figure 2 Figure 7 31 Figure 9 9 Figure 10

Claims (1)

[Scope of Claims] 1. A photoconductor that moves in a certain direction, means for forming an electrostatic latent image of the document image by projecting and forming the document image on the surface of the photoconductor, and this electrostatic latent image. In an electronic copying machine, the electronic copying machine is provided with means for developing an image with toner, and means for transferring the toner image onto copy paper, comprising: means for forming an electrostatic latent image of an image other than the original image on the photoreceptor; Resign! means for moving the formation position of the latent image; means for detecting the dimensions of the copy paper; and a means for moving the formation position of the electrostatic latent image of an image other than the original image according to the dimensions detected by the detection means. An electronic copying machine characterized by being equipped with means for moving the copying machine. 2. The means for forming an electrostatic latent image of an image other than the original image is formed by a monolithic light emitting diode array, and the monolithic light emitting diode array is movable in a direction perpendicular to the direction of movement of the photoreceptor. An electronic copying machine according to claim 1, which is configured as follows.