KR19990015546A - Print Speed Control Circuit and Method of Laser Beam Printer - Google Patents

Abstract

The present invention is a technology for controlling the printing to be processed quickly by controlling the motor at high speed during emergency printing.

Since printing at a constant speed when printing in a laser beam printer can not be printed at a high speed when urgent printing is required, in the present invention, when the turbo key for selecting a high-speed printing mode is pressed, the motor for printing at high speed is printed. Drive to print

Description

Print Speed Control Circuit and Method of Laser Beam Printer

The present invention relates to a printing speed control circuit and a method of a laser beam printer, and more particularly, to a printing speed control circuit and a method for controlling the motor to be processed quickly at high speed during emergency printing.

Typically, a laser beam printer prepares for printing when there is a print command from a computer and waits for data to be actually printed. At this time, when data to be printed is received, a predetermined frequency is generated to print by controlling the motor driver. At this time, by controlling the motor drive to print at a constant speed until the end of the printing always could not be printed quickly if urgent printing is necessary.

An object of the present invention is to provide a printing speed control method for printing by increasing the printing speed when urgent printing is required in a laser beam printer.

The present invention for achieving the above object, in the printing speed control method of a laser beam printer,

After the turbo key for selecting the high speed printing mode is pressed, the motor for printing is operated at a high speed when there is a print command.

1 is a block diagram of a laser beam printer according to an embodiment of the present invention.

2 is a printing speed control flow chart according to an embodiment of the present invention

1 is a block diagram of a laser beam printer according to an embodiment of the present invention.

The laser beam printer is largely comprised of a video controller 10 and a print engine unit 22. The video controller 10 includes a computer interface 12, a video controller 14, a nonvolatile RAM 16, and an engine interface 18. The computer interface 12 is connected between the host computer and the video control unit 14 to interface the input and output signals. The video control unit 14 includes a ROM having a control program, a RAM for temporarily storing various data input from an OPE (Operating Pannel Equipment) 20 and a host computer, and the printer engine processes the data code received from the computer interface 12. The image data is converted into immigration data and transmitted to the print engine 22. Nonvolatile RAM 16 stores data about the printer, and also stores data to select printing of odd and even pages. The engine interface 18 interfaces an input / output signal with the print engine 22 under the control of the video controller 14. The OPE 20 is controlled by the video controller 14 and includes a plurality of keys for inputting various commands and an apparatus for displaying information according to the operation of the laser beam printer.

The print engine unit 22 is composed of a video interface 24, an engine control unit 26, an I / O interface 28, a sensor circuit 30, an instrument driving unit 32, and an electrophotographic developing unit 34 and connected to the video controller 10. The video interface 24 provides an interface for transmitting and receiving signals between the video controller 10 and the engine controller 26. The engine controller 26 controls the mechanical drive unit 32 and the electrophotographic developing unit 34 under the control of the video controller 10, and prints an image according to the image data received from the video controller 10 on a sheet of paper. In addition, the engine controller 26 detects an operation state of each part of the print engine 22 through the sensor circuit 30. Examples of the operation state include paper feeding and conveying states. The I / O interface 28 is connected between the engine control unit 26 and the sensor circuit 30, the mechanical drive unit 32, and the electrophotographic developing unit 34 to interface the input / output signals of the engine control unit 26. The first and second OSCs 28 and 30 generate different frequencies for driving the motor under the control of the engine controller 26. The switch 32 selects the frequency generated from the first to second OSCs 28 and 30 under the control of the engine controller 26 and outputs the generated frequency to the motor driver 34. The motor driver 34 receives the frequency for driving the motor to drive and print the motor.

2 is a printing speed control flow chart according to an embodiment of the present invention.

1 to 2, the operation of the preferred embodiment of the present invention will be described in detail.

In step 101, it is checked whether the turbo key is pressed from the key input unit of the video controller OPE 20. If the turbo key is not pressed, the normal print command is transmitted to the engine controller 26. Then, in step 102, the engine controller 26 controls the switch 32 to be connected to the normal cross terminal NC. When the switch 32 is connected to the normal cross terminal NC, a frequency for driving the motor generated from the first OSC is selected and applied to the motor driver 34. Then, in step 103, the motor driver 34 drives the motor at the frequency generated from the first OSC 28 to perform normal printing. However, when the turbo key is pressed in step 101, the video controller 14 transmits a high speed print command to the engine controller 26. In this case, when the high speed print command is received, the engine controller 26 selects the switch 32 to be connected to the normal open terminal NO. Then, in step 105, the motor driver 34 drives the motor at a frequency generated from the second OSC 30 to perform high speed printing. Here, the speed of the printer uses about 80% to 85% of the load that the motor limits, so there is a margin of 15% to 20%. It is difficult for the motor to withstand continuous use, but it is possible to temporarily output 1 to 2 sheets temporarily.

As described above, the present invention has the advantage that the printer can be used efficiently because it prints at high speed when the turbo key is pressed when urgent printing is required.

Claims (2)

In the printing speed control circuit of a laser beam printer, A key input section for generating a turbo key signal for selecting a high speed print mode; A controller for generating a switching control signal for high speed printing by receiving a high speed printing command when a turbo key signal is generated from the key input unit; A first frequency generator for generating a frequency for driving the motor during normal printing; A second frequency generator for generating a frequency for driving the motor at high speed printing; A switch for inputting different frequencies output from the first-second frequency generator to select a frequency generated from the second frequency generator by a switching control signal for high speed printing of the controller; And a motor driver for driving the motor to receive the frequency generated from the second frequency from the switch and to print at a high speed. In the printing speed control method of a laser beam printer, Printing speed control method of a laser beam printer characterized in that by printing the motor for printing at high speed when there is a print command after the turbo key for selecting the high-speed printing mode is pressed