JP2000201262A - Digital copying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a copy processing time by reading image data out of memory boards by pages in the printing order expanding compressed image data to be printed next on another memory board during a print process for image data of one page read from the other memory board. SOLUTION: Read image data are sent by pages to memory board 20 and 30 alternately. The first memory board 20 is provided with image data of the reverse sides of an original A, an original C, and the top side of an original B. The second memory board 30 is provided with image data of the reverse side of the original B, the top sides of the original A, and the original C. A compressed image data storing memory 23 of the first memory board 20 stores compressed image data of the reverse sides of the original A, the original C, and the top side of the original B. A compressed image data storing memory 33 of the second memory board 30 stores the compressed image data of the reverse side of the original B, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital copying machine.

[0002]

2. Description of the Related Art A digital copying machine includes a single memory board having a function of compressing read image data and storing the compressed image data in a memory, and expanding and outputting compressed image data stored in the memory. It is installed. The memory board includes an image data expansion memory for expanding image data, a QM coder for performing JPEG compression / expansion,
A compressed image data storage memory for storing the compressed image data is provided.

In a conventional digital copying machine, only one such memory board is mounted, and therefore, there are the following problems.

(1) When reading images for a plurality of pages, after reading and compressing the image data of the first page, the image data of the next page is read and compressed. Since the processing takes a long time, image data cannot be read continuously over a plurality of pages, and the image reading time becomes longer. As a result, the copy processing time becomes longer.

(2) In the case of performing printing processing using compressed image data for a plurality of pages stored in a memory,
After the decompression process and the printing process of the compressed image data of the first page are completed, the decompression process and the printing process of the compressed image data of the next page are performed. There is a problem.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital copying machine capable of shortening a copy processing time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital copying machine capable of shortening a copy processing time when printing read image data in an arbitrary order.

It is an object of the present invention to provide a digital copying machine suitable for storing as much image data as possible.

[0009]

A first digital copying machine according to the present invention compresses input image data and stores the compressed image data in a compressed image data storage memory, and compresses the read image data from the compressed image data storage memory. A plurality of memory boards each having a function of decompressing and outputting image data, a plurality of pages of image data read by a scanner unit are converted into one of two pages of image data in a continuous reading order. In order that the image data for one page and the image data for the other one page are stored on different memory boards,
A means for sequentially supplying image data to a memory board designated for each page unit; and a means for reading image data from each memory board one page at a time in accordance with a printing order when printing is performed. While the printing process is performed on the image data of one page read from the board, the decompression process of the compressed image data to be printed next is performed on another memory board.

A second digital copying machine according to the present invention comprises:
A plurality of memory boards and scanners each having a function of compressing input image data and storing the compressed image data in a compressed image data storage memory, and expanding and outputting compressed image data read from the compressed image data storage memory. The image data for a plurality of pages read by the unit is simultaneously supplied to at least two or more memory boards, and the compressed image data is stored in the compressed image data storage memories in the two or more memory boards. In the case of performing printing, the image data of one page and the image data of the other page of the image data of two pages in a continuous printing order are read from different memory boards. Means for sequentially reading image data from a specified memory board for each page unit. During the printing process on the partial image data is being performed, in other memory boards, decompression processing of compressed image data to be printed next is characterized by being carried out.

A third digital copying machine according to the present invention comprises:
A plurality of memory boards and scanners each having a function of compressing input image data and storing the compressed image data in a compressed image data storage memory, and expanding and outputting compressed image data read from the compressed image data storage memory. The image data for a plurality of pages read by the unit is simultaneously supplied to two memory boards, and the compressed image data is continuously stored in the compressed image data storage memory in the first memory board in the first memory board. In the other second memory board, means for storing the compressed image data in the compressed image data storage memory in the memory board from the beginning for each page unit, and while the compressed image data for a certain page is being stored, When the data amount of the compressed image data storage memory in the first memory board reaches the memory capacity, The image data of the next page of the stored compressed image data is supplied only to the second memory board, and the compressed data is stored in the compressed image data storage memory in the second memory board. It is characterized by comprising means for storing the image data continuously.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

[1] Description of memory board

This digital copying machine has two memory boards (a first memory board 20 and a second memory board 30) as shown in FIG. Memory board 2
A selector 10 is provided at a stage preceding 0 and 30.
The selector 10 and the memory boards 20 and 30 are a CPU
100.

Each of the memory boards 20 and 30 has an image data development memory 21, 31, J for developing image data.
QM coder 22, 3 for performing PEG compression / decompression
2. It has compressed image data storage memories 23 and 33 for storing compressed image data.

Image data read by a scanner unit (not shown) is transmitted to two memory boards 2 via a selector 10.
Sent to one or both of 0, 30. If image data is sent to the first memory board 20,
The image data is temporarily stored in the image data development memory 21. Then, the image data stored in the image data expansion memory 21 is compressed by the QM coder 22 and then stored in the compressed image data storage memory 23. The operation when image data is sent to the second memory board 30 is the same.

When printing is performed using the compressed image data stored in the compressed image data storage memory 23 in the first memory board 20, the compressed image data is read from the compressed image data storage memory 23. , QM coder 2
After being decompressed by the image data 2, the image data is output via the image data expansion memory 21 and the selector 10. The same applies to the operation when printing processing is performed using the compressed image data stored in the memory 33 in the second memory board 30.

[2] Description of First Control Method

Hereinafter, the first control method will be described.

For example, a method of controlling the memory boards 20 and 30 when making double-sided copies of three originals A, B and C will be described.

The reading of the original image is performed in the order of the back side a 'of the original A, the back side b' of the original B, the back side c 'of the original C, the front side a of the original A, the front side b of the original B, and the front side c of the original C. Done. The read image data is stored in the memory board 20,
30 are sent alternately for each page unit. Therefore, the first
Image data for the back surface a 'of the document A, the back surface c' of the document C, and the front surface b of the document B, and the second memory board 30 stores the back surface b 'of the document B, Image data for the front side a of the document A and the front side c of the document C are supplied.

Therefore, as shown in FIG. 2, the compressed image data storage memory 23 of the first memory board 20 has
The compressed image data for the back side a ′ of the original A, the back side c ′ of the original C, and the front side b of the original B are stored in the compressed image data storage memory 33 of the second memory board 30 as shown in FIG.
, Compressed image data for the back surface b 'of the document B, the front surface a of the document A, and the front surface c of the document C are stored.

When the image data for one page is supplied to the first memory board 20, the image data for the next page is stored in the second memory without waiting for the completion of the compression processing on the image data. Since the image data can be supplied to the board 30, the image data for a plurality of pages can be continuously read, and the image reading time is shortened.

When the printing process is started, the back surface a 'of the document A, the back surface b' of the document B, the back surface c 'of the document C, the front surface a of the document A, the front surface b of the document B, and the front surface c of the document C The image data is read from the memory boards 20 and 30 in order.

That is, as shown in FIG. 3, first, the image data of the back surface a 'of the document A is output from the first memory board 20, and the back surface of the document A is printed on the back surface of the first recording paper P1. The image data of a 'is printed.

While the image data of the back surface a 'of the document A is being printed, the document B is stored on the second memory board 30.
The decompression process of the compressed image data on the back surface b 'is performed. Then, the obtained image data of the back surface b ′ of the document B is printed on the back surface of the second recording paper P2.

While the image data on the back surface b 'of the original B is being printed, the original C
The decompression process of the compressed image data on the back surface c ′ is performed. Then, the obtained image data of the back surface c ′ of the document C is printed on the back surface of the third recording paper P3.

While the image data of the back side c ′ of the original C is being printed, the original A is stored on the second memory board 30.
Is decompressed on the compressed image data on the front surface a. Then, the obtained image data of the front surface a of the document A is printed on the front surface of the first recording paper P1.

While the image data of the front side a of the document A is being printed, the first memory board 20 performs the expansion processing of the compressed image data of the front side b of the document B. Then, the obtained image data of the front surface b of the document B is printed on the front surface of the second recording paper P2.

While the image data of the front side b of the original B is being printed, the expansion processing of the compressed image data of the front side c of the original C is performed in the second memory board 30. Then, the obtained image data of the front surface c of the document C is printed on the front surface of the third recording paper P3.

As can be seen from FIG. 3, one of the boards 2
While the printing process is being performed based on the image data of one page read from 0, 30, the other boards 20, 3
Since the decompression process is performed on the compressed image data in units of one page at 0, the print processing time for a plurality of pages can be shortened.

It is to be noted that, for example, even at the time of one-sided copying of a plurality of originals, the image data is stored in the memory board 2.
By alternately sending the data to 0 and 30 in units of one page, the copy processing time can be reduced.

[3] Description of the second control method

Hereinafter, the second control method will be described.

For example, in the case of making double-sided copies of three originals A, B, and C, when the printing order is different from the normal printing order, for example, when it is desired to skip printing of a predetermined page. A method for controlling the memory boards 20 and 30 will be described.

As an example of skipping the back surface b 'of the document B, as shown in FIG. 4, the front surface a of the document A is placed on the front surface of the first recording paper P1, and the back surface of the document A is placed on the back surface of the recording paper P1. a 'is printed, the front side b of the original B is printed only on the front side of the second recording paper P2, the front side c of the original C is printed on the front side of the third recording paper P3, and the back side of the recording paper P3 is printed. The back side c ′ of the original C may be printed.

As shown in FIG. 5, the front side a of the original A is printed on the front side of the first recording sheet P1, and the back side a 'of the original A is printed on the back side of the recording sheet P1. The front side b of the original B is placed on the front side of the recording paper P2, and the original C is placed on the back side of the recording paper P2.
Is printed on the surface c of the third recording paper P3,
There is a case where it is desired to print the back surface c ′ of the image.

Also in the second control method, the reading of the original image is performed by reading the back side a 'of the original A, the back side b' of the original B, the back side c 'of the original C, the front side a of the original A, the front side b of the original B, The processing is performed in the order of the front surface c of the document C.

The read image data is sent to both memory boards 20 and 30 at the same time. Therefore, on each of the memory boards 20 and 30, the back surface a of the document A, the back surface b 'of the document B, the back surface c' of the document C, the front surface a of the document A, the document B
Image data for the front surface b of the original C and the front surface c of the original C are supplied.

Therefore, as shown in FIG. 6, the compressed image data storage memories 23, 3 of the memory boards 20, 30 are provided.
3 stores compressed image data for the back side a of the original A ′, the back side b ′ of the original B, the back side c ′ of the original C, the front side a of the original A, the front side b of the original B, and the front side c of the original C.

When printing is performed, both the memory boards 20 and 30 and the selector 10 are controlled so that image data is output from the two memory boards 20 and 30 alternately in the printing order.

When it is desired to perform printing as shown in FIG. 4, first, as shown in FIG.
Then, the image data of the back surface a 'of the document A is output, and the image data of the back surface a' of the document A is printed on the back surface of the recording paper P1.

While the image data on the back surface a 'of the original A is being printed, the original C is stored on the second memory board 30.
The decompression process of the compressed image data on the back surface c ′ is performed. Then, the obtained image data of the back surface c ′ of the document C is printed on the back surface of the recording paper P3.

While the image data on the back side c ′ of the original C is being printed, the original A
Is decompressed on the compressed image data on the front surface a. Then, the obtained image data of the front surface a of the original A is recorded on the recording paper P1.
Printed on the surface of

While the image data on the front surface a of the document A is being printed, the decompression process of the compressed image data on the front surface b of the document B is performed in the second memory board 30. Then, the obtained image data of the front surface b of the original B is recorded on the recording paper P2.
Printed on the surface of

While the image data of the front side b of the original B is being printed, the first memory board 20 performs the expansion processing of the compressed image data of the front side c of the original C. Then, the obtained image data of the front surface c of the original C is recorded on the recording paper P3.
Printed on the surface of

To perform printing as shown in FIG. 5, first, as shown in FIG.
Then, the image data of the back surface a 'of the document A is output, and the image data of the back surface a' of the document A is printed on the back surface of the recording paper P1.

While the image data on the back side a ′ of the original A is being printed, the original C is stored on the second memory board 30.
Of the compressed image data of the front surface c is performed. Then, the obtained image data of the front surface c of the original C is recorded on the recording paper P2.
Printed on the back of

While the image data of the front surface c of the document C is being printed, the first memory board 20 performs the expansion processing of the compressed image data of the front surface a of the document A. Then, the obtained image data of the front surface a of the original A is recorded on the recording paper P1.
Printed on the surface of

While the image data on the front surface a of the document A is being printed, the compressed image data on the front surface b of the document B is expanded in the second memory board 30. Then, the obtained image data of the front surface b of the original B is recorded on the recording paper P2.
Printed on the surface of

While the image data of the front surface b of the document B is being printed, the first memory board 20 performs the expansion processing of the compressed image data of the back surface c ′ of the document C. Then, the obtained image data of the back surface c ′ of the original C is
3 is printed on the surface.

[4] Description of Third Control Method

Hereinafter, the third control method will be described.

The third control method is a control method suitable for storing as much image data as possible in the compressed image data storage memory.

Assume that one-sided copying is performed on a plurality of originals. Each document is represented by A, B, C,..., And image data read therefrom is represented by a, b, c,.

When image data is read from document A,
The read image data a is stored in both memory boards 20, 3
0, and after being compressed, it is stored in the compressed image data storage memories 23, 33 from its head position.

When the compressed image data a for one page can be stored in the compressed image data storage memory 23 in the first memory board 20, the image data b read from the next original B is stored in both memories. It is sent to boards 20 and 30 and compressed. In the compressed image data storage memory 23 in the first memory board 20, compressed image data b is stored after compressed image data a. In the compressed image data storage memory 33 in the second memory board 30, the compressed image data b is stored again from the beginning of the compressed image data storage memory 33.

Hereinafter, similar processing is performed. For example, when the compressed image data e for the fifth document E is stored in the compressed image data storage memories 23 and 33, the capacity of the compressed image data storage memory 23 becomes full and the compressed image data e becomes It is assumed that storage in the compressed image data storage memory 23 is no longer possible. In this case, the image data f read from the next document F is sent to only the second memory board 30 and compressed. Then, the compressed image data f is stored in the compressed image data storage memory 33 subsequent to the compressed image data e stored immediately before. Hereinafter, similar processing is performed.

FIG. 9 shows a state in which the compressed image data a to g for the originals A to G are stored in the compressed image data storage memories 23 and 33 by such a control method.

[0060]

According to the present invention, it is possible to obtain a digital copying machine capable of shortening the copy processing time.

Further, according to the present invention, a digital copying machine can be obtained which can shorten the copy processing time when printing read image data in an arbitrary order.

Further, according to the present invention, a digital copying machine suitable for storing as much image data as possible can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing two memory boards provided in a digital copying machine.

FIG. 2 is a schematic diagram for explaining a method of supplying image data to a memory board by a first control method.

FIG. 3 is a time chart for explaining a method of reading image data from a memory board by a first control method.

FIG. 4 is a schematic diagram illustrating an example of a printing order different from a normal printing order.

FIG. 5 is a schematic diagram illustrating another example of a printing order different from the normal printing order.

FIG. 6 is a schematic diagram for explaining a method of supplying image data to a memory board by a second control method.

FIG. 7 is a time chart for explaining a method of reading image data from a memory board by a second control method.

FIG. 8 is a time chart for explaining a method of reading image data from a memory board by a second control method.

FIG. 9 is a schematic diagram for explaining a method of supplying image data to a memory board by a third control method.

[Explanation of symbols]

 Reference Signs List 10 selector 20, 30 memory board 21, 31 image data expansion memory 22, 32 QM coder 23, 33 compressed image data storage memory 100 CPU

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshinobu Ishimoto 1-2-28 Tamazo, Chuo-ku, Osaka-shi, Osaka Inside Mita Kogyo Co., Ltd. (72) Inventor Ken Nishio 1-2-2 Tamazo, Chuo-ku, Osaka-shi, Osaka No. 28 Mita Industries Co., Ltd. F-term (reference) 2C087 AB05 BB10 BC02 BC05 BD40 2H027 EE08 EE10 5C062 AA05 AB17 AB22 AB42 AC22 AC25 AF07 BA04 5C073 AA02 BA04 CC03 CE01 9A001 BB03 EE04 HH27 JJ35 KK42

Claims (3)

[Claims] 1. A plurality of images each having a function of compressing input image data and storing the compressed image data in a compressed image data storage memory, and expanding and outputting compressed image data read from the compressed image data storage memory. The image data of a plurality of pages read by the memory board and the scanner unit is converted into the image data of one page and the image data of the other one of the image data of two pages in a continuous reading order. Means for sequentially supplying image data to a specified memory board for each page so that the image data is stored in different memory boards. When printing is performed, one image data is stored from each memory board in accordance with the printing order. Means for reading page by page. While printing processing for one page of image data read from a certain memory board is being performed, other memos can be read. A digital copier in which the decompression processing of compressed image data to be printed next is performed in reboarding. 2. A plurality of images each having a function of compressing input image data and storing the compressed image data in a compressed image data storage memory, and expanding and outputting compressed image data read from the compressed image data storage memory. The image data for a plurality of pages read by the scanner unit is simultaneously supplied to at least two or more memory boards, and the compressed image data is stored in the compressed image data in the two or more memory boards. Means for storing data in a storage memory; when printing, a memory board in which one page of image data and the other one page of image data of two pages of image data in a continuous printing order are different. Means for sequentially reading image data from a designated memory board for each page so that A digital copying machine in which, while printing processing for read one page of image data is being performed, expansion processing of compressed image data to be printed next is performed in another memory board. 3. A plurality of images each having a function of compressing input image data and storing the compressed image data in a compressed image data storage memory, and expanding and outputting compressed image data read from the compressed image data storage memory. The image data for a plurality of pages read by the scanner unit is simultaneously supplied to two memory boards, and the compressed image data is stored in the compressed image data storage memory in the first memory board. Stored continuously,
In the other second memory board, the compressed image data is
Means for storing the compressed image data storage memory in the memory board from the beginning for each page unit, and the amount of data in the compressed image data storage memory in the first memory board during the storage of the compressed image data for a certain page When the memory capacity reaches the memory capacity, the image data of the next page of the currently stored compressed image data is supplied only to the second memory board, and the compressed data is supplied to the compressed image data in the second memory board. Means for continuously storing the compressed image data stored immediately before in the data storage memory.