JPS6232438A - Variable power copying device - Google Patents

Abstract

PURPOSE:To prevent the generation of a black frame on a copy form when an original whose size is smaller than a fixed size is copied, by operating a specific key which changes the copy magnification to increase the copy magnification of a form size to the original size by several % while holding setting of the form size. CONSTITUTION:When the original which is a size smaller than the fixed size, the original is placed on an original platen and a form selecting key 12 is operated to set a desired form size to be copied, and thereafter, the form size is detected to add several % to the copy magnification if a frame erasing key 13 is operated. A lens motor 7 is controlled in accordance with the copy magnification set in this manner to control the position of a lens. Thus, a copy image without the black frame is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field> The present invention relates to a variable magnification copying apparatus that can change the copying magnification depending on the size of a document.

<Prior Art and Its Disadvantages> Generally, most bound books are of standard size in columns A and B, but there are also books such as simple binding whose size is slightly smaller than the standard size. When binding a book, the paper (contents) is collated, stiffened, and the top, bottom, and edges are trimmed, so if the paper before binding is a standard size, this trimming will change the size to the standard size. The size is one size smaller. When copying such a well-bound book, if one end of the book is aligned with either the upper or lower reference position of the document table of the copying machine, the result will be as shown in Figures 11 (A) and (B). black line a
, c appear at the top or bottom edge of the copy paper, and the throat becomes a shadow, creating a black line. Particularly in the case of a thick book, the document cover cannot be closed completely, and the copy lamp light is not reflected in areas a and c, resulting in pitch black areas. Moreover, the amount of toner used increases accordingly. The above example is a case of copying an HN that is one size smaller than the standard size, but even with a standard size book, similar black lines will occur if it is not placed accurately at a predetermined position on the document table.

Some conventional copying devices allow you to set the copying magnification arbitrarily, but if you use such a copying device to copy a book that is one size smaller than the standard size and set the magnification to the standard size, it will print as shown above. A frame with black lines does not occur.

However, the operation for changing the copy magnification is complicated, and copying devices that can set any magnification automatically select the paper so that the copy image falls within the range of the paper, so it is difficult to change the copy magnification. Along with the settings, the paper size had to be set manually as well.

<Object of the Invention> The purpose of the invention is to make it possible to copy an original of a size smaller than the standard size on the entire surface of the standard size paper, and to make it possible to make copies even when copying with the original cover open. To provide a copying device which prevents black frames from forming on copy paper.

<Configuration and Effects of the Invention> To summarize, the present invention is capable of copying by setting each of the paper size, document size, and copy magnification, and uses a specific key to change the copy magnification as a copy magnification setting means. The present invention is characterized in that it includes means for increasing the copying magnification of the paper size by several percent with respect to the original size while maintaining the paper size setting by operating the specific key.

According to the present invention, when copying a document one size smaller than the standard size, by operating the specific key,
By increasing the copying magnification by, for example, 3% and performing copying, approximately the center portion of the enlarged original image is copied onto the entire surface of a standard size sheet.

Therefore, the black frame mentioned above protrudes outside the paper and is not copied. A mode for copying on the entire surface of a standard size sheet can be easily set by a simple key operation.

<Embodiment> FIG. 1 is a block diagram of a control section in a variable magnification copying apparatus which is an embodiment of the present invention. The control section is controlled by a microcomputer 4.

Microcomputer 4 has CPU, ROM and RAM
The control program to be processed by the CPU is stored in advance in the ROM. The RAM is a memory used as a working area when executing the processing program. Reference numeral 3 denotes an input/output interface circuit between the key input unit 1 and the sensor 2, and is connected to the bus of the microcomputer 4. Key human power section is paper selection key 12
It consists of a frame erase key 132, a magnification increase key 16, a magnification decrease key 15, etc. The sensor 2 is a sensor that detects whether the document is placed on the document table and the status of other parts.

5 is a drive circuit 6 for the lens motor 7 and a mirror motor 9
It is an input/output interface circuit with the driver mJ circuit 8, and is connected to the bus of the microcomputer 4. C
The PU reads the states of the key human power unit 1 and the sensor 2 as necessary and controls the lens motor 7 and mirror motor 9 using a control program stored in advance in the ROM.

FIG. 9 is a diagram showing a memory map of a part of the RAM.

O8 is the original size, PS is the paper size.

This area is used as a counter.

Figures 2, 3, and 4 (A), (B), and (C).

FIG. 5, FIG. 6, and FIG. 7 are all flowcharts showing the processing procedure of the CPU.

First, when the power is turned on, as shown in Figure 2, each part is initialized and the fixing part is warmed up, and then the sensors and key input parts of each part are read (n 1
0-=n 12-n 14). Next, processing is performed according to the read content.

When it is detected that a document is placed on the document table, the size of the document is determined as shown in FIG. 3, and data representing the document size is input into the memory O8. Thereafter, as shown in FIG. 2, the process returns to step n14 to read the sensor and key manual parts.

When the paper selection key 12 is operated, the content of the original size O8 is first determined as shown in FIG. 4(A). For example, if the original size is 85, it is determined whether the counter C is 0 as shown in FIG. Then, the copy magnification is 1 in the memory CM representing the copy magnification.
．． 00, that is, data representing the same size is input (n20→n22). It is determined at n24 whether the value of the counter C exceeds 2, and if NO, the counter is incremented at n26 and the process returns to the sensor and key reading routine (n24-"n266-■-n14).Next, paper If you press the selection key (since C=1 at this point), the paper size will be A4 and the copy magnification will be 1.1 at n30.
If you press the paper selection key again in the same way, the paper size is set to 84 and the copy magnification is set to 1.14 at n32 (n2B-n30).
32).

In this way, each time you press the paper selection key, the original size O8
Accordingly, standard paper sizes are selected one after another, and at the same time, the copying magnification for each paper size is automatically set. In addition, when the counter C becomes a value of 2 or more, n
At step 34, the counter C is reset to 0 and the paper size selection is repeated. If the document placed on the document table is A4 size, each standard size data is input to the paper size PS according to the value of the counter C by operating the paper selection key, as shown in FIG. 4(C). At the same time, the corresponding copy magnification is set to CM. The paper sizes that can be copied and their copying magnifications for such document sizes are stored in advance as a table as shown in FIG. In other words, if the original size is B5, the paper size that can be copied is B.
5. A4゜B4, and the magnification of each is! , 00. 1.
15.1.41. Note that the paper size A3 is restricted so that it cannot be set. As described above, by operating the paper selection key, paper sizes that can be copied are sequentially selected according to the size of the original placed on the original table, and the corresponding copying magnification is automatically set.

This automatic setting of the copy magnification allows the operator to copy standard-sized originals onto standard-sized paper with simple key operations; however, as mentioned above, when copying originals that are one size smaller than the standard size, In this case, it is possible to prevent the black frame from occurring. After placing a manuscript (a bound book) on the manuscript table and setting the desired paper size for copying by operating the paper selection key, by operating the frame erase key, the paper size is first set as shown in Figure 5. It is detected that the PS is not A3 size, and 0.03 is added to the copy magnification CM. (n40-n42). Furthermore, the lens motor is controlled according to the value of the copying magnification CM set in this way, and the position of the lens is controlled (n44). In general, when binding books, the paper size is 3.
Since the cut is often made within a range of 1.5% or less, it is possible to obtain a copy image without a black border by copying an ordinary bound book with the copying magnification set by operating this border cancellation key. Note that if the original size is considerably smaller than the standard size, the desired copying magnification can be set by increasing the copying magnification in 3% increments by operating the frame erase key multiple times. FIG. 10 is a diagram showing an example of copying according to this embodiment. The black frame is clearly removed compared to the conventional FIG. 11.

Since the copying device has the paper selection key and the frame erase key, it is possible to copy most manuscripts and books, but when copying a manuscript of a special size, etc., it is necessary to arbitrarily set the copying magnification. In such a case, the copy magnification can be arbitrarily set by operating the magnification increase key 16 or the magnification decrease key 15. When the magnification increase key is operated, the copy magnification CM will be 1.41 as shown in Figure 6.
It is determined that it is not, and 0.01 is added to the copy magnification CM.

In other words, increase the copy magnification by 1% (n50-”n52
). Thereafter, the paper size PS to be copied is set based on the size of the original and the value of the copy magnification CM. Specifically, as shown in FIG. 8, the paper size that can be copied is set based on the relationship between the original size O8, the paper size PS, and the copy magnification CM. For example, the original is 85 size and the copy magnification is 1.
If it is 01, the paper size is set as A4. Thereafter, the lens motor is controlled according to the copying magnification set at n56. Similarly, if you scan the magnification down key, the copy magnification CM at that time will be the minimum magnification of 0.70, as shown in Figure 7.
It is determined that this is not the case, and the copy magnification CM is decreased by 1%.

Note that if CM=1.41 at n50 in FIG. 6 or 0.70 at n60 shown in FIG. 7, these key operations are invalid. In this way, when the copy magnification is set by operating the copy magnification increase key 16 and the copy magnification decrease key 15, unlike the case of operating the frame erase key described above, the paper size that can be copied is automatically set.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control section in a variable magnification copying apparatus which is an embodiment of the present invention, and FIGS. 2, 3, and 4 (A
) (B) (C) , Figures 5, 6, and 7 are flowcharts showing the processing procedure of the CPU, and Figure 8 shows the contents of the memory showing the relationship between the original size, paper size, and copying magnification. 9 is a memory map of a part of the RAM, FIG. 10 is a diagram showing an example of copying a bound book according to an embodiment of the present invention, and FIG. 11 (A) and (B) are diagrams showing a conventional copying apparatus. Each figure shows an example of a copy image of a book bound using the above-described method. Outsourcer Sharp Corporation

Claims (1)

[Claims] (1) Copying with a paper size setting means for selecting or automatically detecting the paper size, an original size setting means for specifying or automatically detecting the original size, and a copying magnification so that the size of the original image to be copied matches the paper size. and a copying magnification setting means, the copying magnification setting means includes a specific key for changing the copying magnification, and by operating this specific key, the paper size setting by the paper size setting means is maintained and the original size is changed. A variable magnification copying apparatus comprising means for increasing the copy magnification of the paper size set by the paper size setting means by several percent relative to the original size set by the setting means.