JPS6138967A - Copying method of bookbound-original - Google Patents

Abstract

PURPOSE:To prevent the outer edge part of a copy from the formation of a black frame at the copying of bookbound-original by erasing an electrostatic latent image formed on a photosensitive drum by lighting blank lamps which is much than the proper number of lamps. CONSTITUTION:A microcomputer 5 controls a driver 5 in accordance with a copying paper size signal or an original size signal and an original kind signal to light up blank lamps which are much by one than the proper number of lamps corresponding to the size of the original out of plural blank lamps b1-b22 during a prescribed period in the exposure of the original. Consequently, an unnecessary latent image including a white part on the outer edge part of the original which is formed on the photosensitive drum is erased, so that the outer edge part of a copy is prevented from the formation of a black frame at the copying of the bookbound-original.

Description

[Detailed description of the invention] (Technical field> The present invention relates to a method for copying a book manuscript.

<Prior art> Conventional copying machines have a configuration in which the blank lamp is not turned on at all when selecting the same size copy, or A3 size, A4 size, 8
A configuration is adopted in which a blank lamp is turned on according to a predetermined copy paper size such as 4 size or 85 size.

When copying a normal, thin original, it is exposed while being sandwiched between the original placing table and the original holding plate, and the lower surface of the original holding plate is entirely white. Therefore, there will be no black border on the outer periphery of the obtained copy, resulting in a neat copy.

On the other hand, when copying a thick book document, it is common practice to open the desired page, place it on a document table, and press it with your hand to perform the copying operation. - In the case of book manuscripts, it is necessary to place the joint between the pages as close to the top of the document table as possible, and the operation of opening and closing the document presser plate is different from that for normal manuscripts. This is because it is more troublesome, or if you try to forcefully close it, there is a risk of damaging the document holding plate. In this case, a black border is formed on the outer periphery of the resulting copy, making it unsightly.

Furthermore, even when the original holding plate is closed, book originals are usually quite thick, and most of the light irradiated on the original holding plate outside the book original does not reach the photoreceptor drum. A black border is formed on the outer periphery of the copied copy, making it unsightly.

Furthermore, as shown in FIG. 6, even if the blank lamp (B') is turned on in accordance with the predetermined copy paper size (P'), the book manuscript (D') is set to the standard size. Because it is difficult to accurately position the
If it deviates from the set position, a black border will be formed in the same manner as above, resulting in an unsightly appearance. Furthermore, since the edges of book manuscripts are usually sloped (see d" in the figure), there is a black border on the edge of the copy that corresponds to this slope (see p" in the figure). There is a problem in that it is formed and is also unsightly.

In addition, with the formation of the black border,
There are also problems in that toner is wasted and the burden on the cleaner increases.

Purpose> This invention was made in view of the above problems,
An object of the present invention is to provide a method for copying a book manuscript, which can produce a neat copy without forming a black border on the outer periphery of the copy even when copying a book manuscript. .

In order to achieve the above object, the method for copying a book original of the present invention sequentially exposes the original to light to form an electrostatic latent image on a photoreceptor, visualizes the electrostatic m-image, and copies it. In a copying method that transfers onto paper, when copying a book original, all blank lamps are turned on for a predetermined time before the end of exposure of the original and for a predetermined time before the end of exposure to erase the electrostatic latent image at the corresponding position. The method is characterized in that during the time period between the two, a greater number of blank lamps than the appropriate number are turned on to eliminate the electrostatic latent image at the corresponding position.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 5 is a schematic diagram of the main parts showing the internal mechanism of a copying machine that implements the book manuscript copying method of the present invention.

(1) is a document mounting table located on the top surface of the copying machine main body (not shown), and an exposure lamp (21
), a reflecting mirror (22), (23), (24), a lens (25), and a reflecting It (26), an exposure lamp (21), and a reflecting mirror (22). By moving (23) and (24) in the six directions of the arrows, the original (D) can be sequentially exposed.

Below the optical section (2), there is a photoreceptor drum (31) that rotates in the direction of arrow C for each copying operation, a static elimination lamp (32), a charger (33), and a developing device (3).
4), transfer charger (35), and cleaner (36)
) and a photosensitive drum (3) uniformly charged by a charger (33).
An electrostatic latent image is formed by irradiating the surface of the document ([)) with reflected light from the document ([)], and this electrostatic latent image is transferred to the developing device (
34) to visualize it into a toner image, and transfer it to a transfer charger (
35) allows the toner image to be transferred onto copy paper (P). Further, (41) is a registration roller that constitutes a part of the copy paper feeding section, and can feed the copy paper (P) at a speed approximately equal to the circumferential speed of the photosensitive drum (31).

In addition, (B) is a blank lamp, and after forming an electrostatic latent image,
Excess charge can be eliminated before reaching the developing position by the developing device (34). Further, a document type selection key for indicating whether the document is a book document or a normal document is attached to an operation panel (not shown).

FIG. 1 is a schematic diagram showing the relationship between a document (D), a photosensitive drum (31), and a blank lamp (B).

In the figure, the solid line indicates the optical path when copying, for example, 84-size copy paper (P), and the original (D>) indicates an 85-size book. In this case,
It has been shown that even if an 85-size book is opened and set on the document placement table (1), the total width in contact with the top surface of the document placement table (1) will be slightly smaller than that of an 84-size book. Therefore, by lighting one more blank lamps than the number of blank lamps (B) corresponding to the 84-size copy paper (P) and corresponding to the ends in the length direction, for a predetermined period of time. By lighting all blank lamps (B),
It is possible to eliminate the charge on the peripheral portion (see the area indicated by 01 and p2 in the figure) that becomes the black border. Even with this configuration, since the peripheral edge of the book document (D) is usually a blank area, there is no problem even if the charges are eliminated by a blank lamp.

Further, in the figure, (11) is a document holding plate that can be rotated upward, and (12) is a limit switch that is activated by downward rotation of the document holding plate (11).

However, the mounting position of this limit switch (12) is set so that it will not operate even if the document holding plate (11) is rotated downward with the book document (D) set.

FIG. 2 is an electrical circuit diagram, in which a copy paper size signal obtained from a paper feed unit is applied to a one-chip microcomputer (5), and the output of the microcomputer (5) is
A signal is applied to the driver (51) via the gates (G1) (G2) (G11), and the output signal of the driver (51) is applied to a pair of blank lamps (bl') located symmetrically with respect to the center. (b22>, (b2>
(b21), (b3) (b20) 1. ,,,
(bll) and (bl2) are applied to the series circuits, respectively. In addition, the microcomputer (5) transmits a document type instruction signal instructing that a book manuscript should be copied.
is applied to. Therefore, based on the original type instruction signal and the copy paper size signal, the necessary blank lamps are lit from both ends of the blank lamp (B) to reduce the electric charge on the edges of both layers of the photoreceptor drum (31). It can be made to disappear over a predetermined width.

However, the copy paper size signal is sent to the microcomputer (5).
Instead of applying an original size signal to the microcomputer (5), the document size signal is manually set or automatically detected.
can also be applied. In the above case, since it will be affected by the copy magnification, the set copy magnification signal is applied to the microcomputer (5),
It is also possible to control the lighting of the blank lamp (B) depending on the set copying magnification.

FIG. 3 is a flowchart showing the copying operation, and FIG. 4 is an explanatory diagram showing the lighting states of the blank lamps corresponding to each position on the document table.

After setting the original <D) on the original placing table (1), close the original holding plate <11> as necessary and operate the print key (not shown) to perform the copying operation as follows. can.

When the original size signal or copy paper size signal is applied to the microcomputer (5) in step (2), the number of blank lamps to be lit is calculated based on the size signal in step (2) and input into the blank buffer, and in step (2) , set an appropriate scan time (the time required to expose and scan the original using the B light lamp and anti-mirror) and timer T1 based on the above signals, and in step (2) set the exposure lamp (21) and anti-mirror (1) l&ff. (22
)(23) The operation of (24) is started, and in step ■, the timer T1 starts the time measurement operation. By determining whether or not 12) is ON, it is determined whether or not it is a copy of a book manuscript.

If it is determined that the copy is a book manuscript, the light from the exposure lamp (21) reaches the photoreceptor drum (31),
The blank lamp (
B) After the predetermined time To (see Figure 6) has elapsed, the blank lamp (bl) is turned on in step ■.
) (b2) ... (b22) are all turned on, and at the same time, in step ■, timer 2 is started, and in step ■, the preset time (exposure lamp,
This is the time it takes for the anti-mirror to move downstream in the exposure movement direction by p2 (see FIG. 4) from the leading edge of the document, and is set to be at least longer than the time required to move by p2. ) has elapsed. Therefore, for a predetermined period of time after the start of scanning, all charges on the surface of the photoreceptor drum (31) disappear, as shown by the solid line ■ in FIG. Thereafter, in step O, blank lamps whose number is 1 more than the number of blank lamps input to the blank buffer are set, and in step 2, the time measured by timer T1 is determined by the size signal, that is, the exposure lamp, the opposite side The mirror is p2 from the back edge of the document.
Wait until the time required to move upstream in the exposure movement direction by (see FIG. 4) is reached. Therefore, during this period, as shown by the solid line ■ in FIG. 4, the photoreceptor drum (31)
The charges on the front surface of the document (D) corresponding to the peripheral edges p1 and p2 are eliminated. Next step @
Blank lamp (bl) again at (b2>...
・Turn on all (b22), start timer T3 in step ■, and set the timer T3 in step [phase] for a preset period of time (from a position upstream in the exposure movement direction by 02 from the rear edge of the original to at least the rear edge of the original). After waiting until the time required to move up to
- Turn off (b22). Therefore, during this period, as shown by the solid line ■ in FIG.
1) All charges on the surface will disappear.

After that, turn off the exposure lamp (21) and turn off the exposure lamp (21).
1) The anti-tA mirrors (22), (23), and (24) are returned to their original positions in preparation for the next copying operation.

Furthermore, if it is determined in step (■) that the original is a copy of a normal original, the number of blank lamps input to the blank buffer is lit in step (2), and in step (2)
After the time measured by the timer T1 reaches the appropriate scan time, the process from step 2 is performed.

Therefore, when copying a normal manuscript, a copy image is formed within the area indicated by the solid line in Figure 4, whereas when copying a book manuscript, the copy image is formed within the area indicated by the solid line in Figure 4. A copy image is formed only within the area indicated by the dashed line in the center, and a white background portion is formed at the peripheral portions indicated by pl and p2. That is, in the case of copying a book original, the resulting copy image will be smaller than the original, but this is not inconvenient because the periphery of a book original is usually a blank area.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may include setting documents by edge alignment instead of center alignment, blank lamp (bl)
It is possible to change the size of (b2)...(b22) according to the distance from the document setting reference position, and various design changes may be made without changing the gist of the present invention. is possible.

Effectiveness As described above, this invention copies book manuscripts by dissipating the charge on the photoreceptor up to a position slightly inward from the outer edge of the manuscript, so there is no black border around the outer edge. It has the unique effect of being able to obtain clean copies without any blemishes.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the relationship between the original (D), the photosensitive drum (31), and the blank lamp (B), Fig. 2 is an electric circuit diagram, Fig. 3 is a flowchart, and Fig. 4 is a blank lamp (B). It is an explanatory diagram explaining lighting control of B), and the same figure (B) - (F) are the same figure (A>
Fig. 5 is a schematic diagram showing a copy image; Fig. 6 is a schematic diagram of the main parts showing the internal mechanism of the copying machine; Fig. 7 is a schematic diagram showing a conventional example. (31)...Photoconductor drum as a photoconductor, (B)
・Blank lamp, (D) ・Manuscript, TI, T2
, T3... timer. Patent applicant Sanda Kogyo Co., Ltd. Figure 1

Claims (1)

[Claims] 1. Expose the original sequentially to create an electrostatic latent on the photoreceptor. Forms an image, visualizes the electrostatic latent image, and copies it. In the copying method that transfers onto paper, When copying a foreign original, A predetermined time after the start of exposure and before the end of exposure Turn on all blank lamps for a certain period of time to eliminate the electrostatic latent image at the corresponding position, In the time period in between, it is more than the appropriate number. Light up a large number of blank lamps. to eliminate the electrostatic latent image at the corresponding position. A book manuscript copying method characterized by: 2. One from the appropriate number in the middle time period The above patent illuminates many blank lamps. A copy of the book manuscript as set forth in claim 1. Photography method. 3. The appropriate number is determined based on the document size. Clause 1 or 2 of the above claims How to copy the book manuscript described. 4. The appropriate number is determined based on the copy paper size. Claim 1 or 2 Method for copying book manuscripts as described in section.