JPH01967A - copying 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 [Field of Industrial Application] The present invention relates to a copying machine having a line ring/frame detection function.

[Conventional technology]

Copying equipment including general C1' core Y/photography equipment,
The original placed on the original table is optically scanned and a copied image is formed based on the reflected light. In particular, with conventional devices, in the @ area where no original is placed, the surface of the pressure plate may become cobby if the original is smooth and does not have any gaps when pressed with the pressure plate. If the original is made of wood, for example, the pressure plate will not close properly and a gap will appear, so when copying, the outer part of the original will not close properly.
Copied with black borders.

On the other hand, in recent years, the so-called document detection function, which scans the entire area of the rotary table once and detects the size and position of the document at this time, has been introduced. Copying devices have been developed and commercialized.

As shown in Figure 4, this device detects the difference in light reflected from the surface of the original paper and the pressure plate that presses the document. 1-E plate is used.

[Problem that the invention seeks to solve]

For this reason, with this device, when the document detection function is activated, it is possible to copy the outer part of the document as a white background, and when the document detection function is disabled, even if the document is thin, the document can be copied. When the outer portion enters the copying area, the pressure plate portion is copied, resulting in a black border in white, ql, and copying.

By the way, there are cases in which document detection can be canceled, such as when you want to omit scanning for detection in order to increase the copying speed, or when you want to omit scanning for detection in order to increase the copying speed, or when you want to cancel the document detection depending on the usage.
1. The function and necessity of document detection cancellation is true.

However, when the applicant and others requested a review, it was found that at the copying speed described below, canceling the detection would cause inconvenience to the copying device itself. This is when the copying machine cannot recognize the size of the recording paper.For example, in the case of recording paper of A3, A4, B4 size, etc., which is often used for manual work,
A special cassette is often used to feed paper, and generally the cassette side is provided with pins or indentations to indicate the size, and a device that doubles the paper size is manually operated. In the case of recording paper, it is usually not fed from a cassette, but one sheet at a time from a separate tab feeder 11. In the case of this type of paper feed,
Although it is not impossible for the copying apparatus to automatically detect the size of the fed recording paper, Configuration F is extremely difficult.

Therefore, when manually feeding paper, most devices do not detect the paper size.

In this way, when the paper feed size is not detected and the document detection is canceled, I9. ji4. Since I don't know the size of the recording paper, I have no choice but to copy the entire area in brown to prevent image loss.For example, if the maximum size is A3,
If you copy a postcard-sized original while feeding a postcard, the area B in Figure 5 will not be transferred to the image carrier such as a photoreceptor as it is developed during the process. , the developer in this area is collected as is by the cleaner.

Fig. 6 shows an example of a conventional electrophotographic device.
After repeating the steps f=r and developing with the developing device 17,
The solid black part of the developer on the surface of the photoreceptor 15 that protrudes outside the recording paper 22 is directly removed by the cleaner 2.
The toner particles scraped off by the toner are scattered inside the machine, contaminating the inside, and eventually the cleaner 20 cannot keep up with the capacity, causing overflow and toner clogging. Furthermore, if a waste toner bottle with a small capacity is used, the bottle will quickly become full, and the developing device itself will consume more developer than usual, resulting in poor performance.

The present invention was proposed in order to prevent the inconveniences in the method of use as described below, and provides an extremely necessary and effective protection function for a copying apparatus having a document detection means. Yes (to solve the problem)
Means and Effect) In the present invention, in the case α when the recording paper size cannot be detected, the document size detection is forcibly executed regardless of whether the document size detection is canceled. Prevent the inconvenience of

〔Example〕

Hereinafter, the present invention will be explained with reference to Examples.

FIG. 21 is an external view of the embodiment device. In Figure 1,
Reference numeral 1 denotes a reader unit for reading a document, and has a configuration as shown in FIG. 4. In addition, 2 is a printer unit that forms an image according to the read signal, and 1: is a printer unit that forms an image according to the read signal.
'-A well-known laser printer consisting of a photographic section is used. In addition, the number 3 in the 1st page indicates paper feeding by a sheet feeder [1], and by tilting the stiffness in the direction of the arrow, the paper feeding means can be switched from the paper cassette 4 or 5 to the sheet feeder by a sheet feeder. It has become.

Here, when feeding paper from cassette 4 or 5,
A bin provided on the cassette side at the interface between the cassette and the printer 2 (not shown) allows you to
It is configured so that you can know the horizontal direction.

In addition, prior to duplication, a CCD sensor 13, which has a document detection function, optically scans the original 5-shima stand and detects the document position, f, and 11g, and detects the document. It has a means to release it.

Note that if the vertical or horizontal orientation of the paper or the vertical or horizontal orientation of the document is determined in advance, it is of course not necessary to detect this.

Therefore, in the case of a paper feed mode that can be detected based on the size of the paper or the shape of the skein, gutter, deck, etc., when document detection is canceled, the Convert the image on the transfer/j section to a white background signal on the reader or printer side. 1. If the image is 1/" C or wide, it is OK. When the document is detected and the transfer section does not protrude from the recording paper, it is the same as 6. The outside of the paper is white (1j
It would be better to convert it to a number.

On the other hand, in the manual feed mode, even if the document detection function is canceled, the function of the release means can be forcibly disabled. When it is knocked down, micro switch 2 will be activated as shown in Figure 2.
3 is turned off, and its 1-logic circuit is configured as shown in FIG.

In this way, in the part of the reader shown in FIG.
The size of the document 7 is read once. Next, the document image is scanned, but at this time, the surface of the pressure plate 6 on the document side is made of a mirror surface, and the size of the pressure plate 6 is approximately A3. Assuming that the paper sizes of the F insert and the F insert are both the size of a postcard, and the relationship is as shown in FIG.
Part (B) of the figure, that is, I! The part without X draft is black (
The pressure plate 6 is manually inputted as ``i''.In addition to the mirror type, a blue type is also often used, but in this case as well, the signal is almost black or stiff.If this is output to the printer 21 as it is, it will not be recorded. The non-transfer area where there is no paper will be contaminated with toner.However, since the size of the original 7 is read once by pre-scanning, the part (B) in Figure 5 is the area where there is no original. Recognizing this, a part of the reader converts the black signal to a white background No. 1.1 and outputs it, and as a result, it is possible to prevent the non-transfer area of the printer 2 from being contaminated with toner.

Note that there may be cases where you want to select cassette paper feed 11 on the reader part 1 and use it while the manual paper feed 113 is tilted in the direction of the arrow. The logic should be such that when the selection key is pressed, if the paper feed [13] falls in the direction of the arrow, strong-1 document detection is canceled.

(See Figure 3) Furthermore, if the following processes are used in combination, the degree of safety can be further increased. That is, when the F-sheet feeder 1]3 is tilted in the direction of the arrow JJ and the reader 1 enters the F-sheet mode, a message is issued to the reader to manually input the F-sheet size. In this way, even if you use a document that is larger than the F insert paper, the image part of the document that protrudes from the recording paper can be cut using the manually generated paper information. , which is more secure.

It goes without saying that C may be used in combination with various other modes related to document detection, such as a center movement mode in which the detected document is output to the center of the recording paper. In addition, in this embodiment, the case where L is used for interleaved copying has been explained, but in addition to this, the cassette is also used to feed paper of special sizes, and the cassette is used because various sizes of paper can be placed in one cassette. Similarly, when using a so-called universal cassette, in which it is not possible to transfer paper size information to a part of the reader, such as a bottle, etc.
+ Possible 4. Furthermore, it is of course possible to use Overhet Brossoekter paper, tracing paper, etc. as the recording paper.

Also, on the Kinomi school side, did you explain about the Denkle image processing type copying machine, which consists of a reader part and a printer part?
It is highly probable that the present invention will be applicable to the company even in the case of conventional analog copying machines equipped with a document detection function.

〔Effect of the invention〕

As described above, in the case where the recording paper size is not included in the automatic detection 7, the present invention can prevent wasteful consumption of consumable materials for IIf visual image formation. Historically, when applied to electrophotographic equipment, it has been used to prevent in-machine staining and cleaner clogging of copying machines due to unrolled toner scattering, etc.
It is extremely effective against the like.

[Brief explanation of drawings]

FIG. 1 is an external view of an embodiment of the present invention, and FIG. 2 is an external view of an embodiment of the present invention. FIG. 3 is an explanatory diagram of the operation of the same embodiment, FIG. 4 is a schematic diagram of a part of the reader of the device that is the basis of the present invention, FIG. 5 is an explanatory diagram of the operation of the conventional example and the actual h'er example, and FIG. The figure is a schematic diagram of a conventional example. In the figure!・・・・・・Reader 2・・・・・・Printer section 3・・・・Counterfeed paper [1 4, 5・・・・Cassette 6・・・・Colored Pressure plate or mirror pressure plate 13...
...Original detection means

Claims (4)

[Claims] (1) Original size detection means for detecting the original size prior to copying, release means for releasing the detection of the original size by the original size detection means, paper feeding means for supplying recording paper, and the feeding means for supplying recording paper. In a copying apparatus equipped with a recording paper size detection means for detecting the size of recording paper stored in the paper means, when executing a paper feeding mode in which the recording paper size cannot be detected by the recording paper size detection means, the original A copying apparatus characterized by comprising means for forcibly executing size detection. (2) When executing a paper feeding mode in which the recording paper size cannot be detected by the recording paper size detection means, the function of the release means for canceling the detection of the document size by the document size detection means is forcibly disabled. 2. A copying apparatus according to claim 1, further comprising means for: (3) The first aspect of the present invention is characterized by comprising means for detecting the recording paper size when executing a paper feeding mode in which the recording paper size cannot be detected by the recording paper size detection means.
Copying device as described in section. (4) The copying apparatus according to claim 1, wherein the paper feeding mode in which the recording paper size cannot be detected is a paper feeding mode using a manual feed, a universal cassette, or the like.