KR100252107B1 - Method and apparatus for transfer printing data - Google Patents

Abstract

PURPOSE: A method and apparatus for transmitting printing data is provided to skip a data conversion process when a simplex printing is performed and a duplex printing is performed. CONSTITUTION: A frame buffer memory(21) converts input image information into bitmap-typed image data. A parallel/serial converting unit(22) converts the image data stored in the frame buffer memory(21) into serial data, and transmits the data to an engine unit. The parallel/serial converting unit(22) comprises a frame buffer memory(221) and a both directions shift register(222). The buffer memory(221) receives and stores image data stored in the frame buffer memory(21), and outputs the data. In case that a simplex printing is performed, data are received from the data stored in a start address out of image data stored in the frame buffer memory(221) successively. In case that a duplex printing is performed, data are received from the data stored in a last address out of image data stored in the frame buffer memory(221). The both directions shift register(222) transmits image data inputted from the frame buffer memory(221) to the engine unit in serial by one bit. A direction controller(223) generates a direction control signal for making the transmission directions of the simplex printing and the duplex printing reverse.

Description

Print data transmission method and device

The present invention relates to a method and apparatus for transmitting print data, and more particularly, to a method and apparatus for transmitting print data in a printer having a duplex function.

In general, the print data input to the printer is converted into image data in the form of a bitmap, and then converted into serial image data and transmitted to the engine unit, and the engine unit receiving the serial image data receives a predetermined synchronization signal. According to the printing is done.

By the way, the data transmission as described above is performed in a form different from that of performing a simplex printing and a case of performing a duplex printing. This is because the printing paper is rotated 180 degrees when the image data is scanned on the front surface of the printing paper and then the back side of the printing paper is placed at the scanning position via a predetermined path for duplex printing.

Therefore, in the related art, image data in the form of bitmap to be printed when simplex printing is performed and when duplex printing is performed are transmitted in different forms. This will be described with reference to the drawings.

1 is a block diagram showing a schematic configuration of a conventional data transmission apparatus. Referring to FIG. 1, a conventional data transfer apparatus includes a frame buffer memory 11 that stores input image information as bitmap image data, and receives image data from the frame buffer memory 11 in serial data format. It comprises a parallel / serial converter 12 for outputting. The parallel / serial converter 12 shifts the buffer memory 121 for temporarily storing the input image data and the shift register for outputting the image data from the buffer memory 121 in series, i.e., bit by bit, to the engine unit. It consists of 122.

When such a data processing apparatus performs simplex printing, the input image information is sequentially converted into bitmap data and then stored in the frame buffer memory 11. The bitmap data stored in the frame buffer memory 11 is input to the buffer memory 121 of the parallel / serial converter 12. Then, the data is loaded into the shift register 122 in the order stored in the buffer memory 121 in order for the engine unit to transmit in the order of one bit. Then, in synchronization with the data transfer clock, each data of the shift register 122 is sequentially transmitted to the engine unit.

On the other hand, when the data processing apparatus as described above performs duplex printing, after converting the input image information into the image data in the form of a bitmap, and stored in the frame buffer memory 11, the bitmap data stored at this time The shape should be the data shape of the inverse shape of the bitmap data when performing simplex printing.

As described above, in the case of performing simplex printing and duplex printing, since different types of bitmap data should be used, the printing speed is reduced due to time consumption due to data conversion or the like. In particular, when the input image is an image requiring a graphic or a bitmap font, more time is required for the data conversion as described above, which causes a problem that the printing speed is lowered and the system load is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a print data transmission method and apparatus which do not need to convert data to each other when performing simplex printing and performing duplex printing.

1 is a block diagram showing a schematic configuration of a conventional print data transmission apparatus.

2 is a block diagram showing a schematic configuration of a print data transmission apparatus according to the present invention;

In order to achieve the above object, the print data transmission device according to the present invention comprises a frame buffer memory for converting and storing the input image information into image data in the form of a bitmap; And a parallel / serial conversion unit for converting image data stored in the frame buffer memory into serial data and transmitting the serial data to an engine unit.

When performing the simplex printing, the parallel / serial conversion unit sequentially receives and stores the data stored at the start address among the image data stored in the frame buffer memory, outputs them in the order of input, and performs duplex printing. In this case, the buffer memory for receiving the input from the data stored in the last address from the image stored in the frame buffer memory in reverse, and outputs in the order received; And a bidirectional shift register configured to transmit data input from the buffer memory to the engine unit in series, so that the transmission direction is opposite to each other when performing the simplex printing and the duplex printing. .

In the present invention, it is preferable that a direction controller for controlling the data transfer direction of the bidirectional shift register is further provided.

In addition, the print data transmission method according to the present invention for achieving the above object, in the print data transmission method of a printer having a duplex function to be printed on both sides of the printing paper, (A) bit input image information Converting the image data in a map form into a frame buffer memory; (B) in the case of simplex printing which prints on the front side of the printing paper, sequentially loading the shift register from the data stored at the start address among the image data stored in the frame buffer memory; (C) in the case of duplex printing, which performs printing on the back side of printing paper, loading the reverse register from the data stored at the last address among the image data stored in the frame buffer; And (d) transferring the data loaded in the shift register to an engine unit, the reverse direction being reversed when the transmission direction is the simplex printing and the duplex printing.

Hereinafter, a print data transmission method and apparatus according to the present invention will be described with reference to the accompanying drawings.

The print data transmission method and apparatus according to the present invention is characterized in that a data conversion procedure is omitted by changing the data transmission order during simplex printing or duplex printing.

2 is a block diagram showing a schematic configuration of a print data transmission apparatus according to the present invention. Referring to FIG. 2, the print data transmission apparatus according to the present invention includes a frame buffer memory 21 for converting input image information into image data in a bitmap form and storing image data stored in the frame buffer memory 21. And a parallel / serial conversion section 22 for converting the serial data into an engine section.

In particular, the parallel / serial converter 22 includes a buffer memory 221 and a bidirectional shift register 222.

The buffer memory 221 receives and stores image data stored in the frame buffer memory 21 and sequentially outputs the image data. In this case, when the simplex printing is performed, data is sequentially input from the data stored at the start address among the image data stored in the frame buffer memory 221, and when the duplex printing is performed, the data is stored in the frame buffer memory 221. The image data is inputted in reverse from the data stored at the last address.

The bidirectional shift register 222 transfers the image data input from the buffer memory 221 in series, i.e., bit by bit, to the engine unit. At this time, the transfer direction can be reversed in the case of performing the simplex printing and the duplex printing, and for this purpose, a direction controller 223 for generating a predetermined direction control signal is further provided.

The operation of the print data transmission device having the above configuration will now be described.

First, image data obtained by converting input image information into a bitmap form is stored in the frame buffer memory 21. In order to convert the stored image data into serial data, the buffer memory 221 of the parallel / serial conversion section 22 receives image data stored in the frame buffer memory 21 and stores it once. At this time, the data input order is different in the case of performing the simplex printing and the case of the duplex printing. That is, in the case of performing simplex printing, the data stored at the start address are sequentially input from the image data stored in the frame buffer memory 21. Then, it is loaded into the bidirectional shift register 222 in the order of input. On the other hand, in the case of performing duplex printing, the data stored at the last address among the image data stored in the frame buffer memory 21 is inputted in reverse. Then, it is loaded into the bidirectional shift register 222 in the order of input.

As such, the data loaded in the bidirectional shift register 222 is transmitted bit by bit to the engine unit. At this time, data is transmitted in the opposite direction when simplex printing and duplex printing are performed. That is, in the case of performing simplex printing, it is transmitted from the later bit to the engine unit in accordance with a predetermined direction control signal from the direction controller 223. When duplex printing is performed, the first bit is transmitted to the engine unit in accordance with the direction control signal from the direction controller 223.

As described above, according to the method and apparatus for transmitting print data according to the present invention, since the process and form of bitmap data conversion in duplex printing are the same as in simplex printing, there is an advantage in that the printing speed is increased.

Claims (3)

In the print data transmission method of a printer having a duplex function for printing on both sides of the printing paper, (A) converting input image information into image data in the form of a bitmap and storing it in a frame buffer memory; (B) in the case of simplex printing which prints on the front side of the printing paper, sequentially loading the shift register from the data stored at the start address among the image data stored in the frame buffer memory; (C) in the case of duplex printing, which performs printing on the back side of printing paper, loading the reverse register from the data stored at the last address among the image data stored in the frame buffer; And (D) transmitting the data loaded in the shift register to an engine unit, the transmission direction being opposite to the case of the simplex printing and the duplex printing. A frame buffer memory for converting and storing input image information into image data in a bitmap form; And A print data transmission device including a parallel / serial conversion unit for converting image data stored in the frame buffer memory into serial data and transmitting the same to an engine unit. The parallel / serial converter, In the case of performing simplex printing, the image data stored in the frame buffer memory is sequentially inputted from the data stored at the start address, stored, and then output in the order of input. In the case of duplex printing, the frame buffer memory A buffer memory which receives the data stored at the last address among the image data stored in the reversely and stores the data in reverse order; And And a bidirectional shift register which transmits data input from the buffer memory to the engine unit in series and has a transmission direction opposite to that of the simplex printing and the duplex printing. Data transmission device. The method of claim 2, And a direction controller for controlling a data transfer direction of the bidirectional shift register.

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