KR100289607B1 - Vertical factor parade method for both direction printer using DC motor - Google Patents

Abstract

The present invention includes two sensing means for recognizing the position of the print head on both sides of the printing section, using a DC motor as a transfer means of the print head, based on the print head detection signal generated by the sensing means The present invention relates to a vertical printing method of printing in a bidirectional printer for performing a printing operation. In particular, the first sensing means detects the position of the printing head when transferring the printing head in a forward direction, thereby controlling the printing position according to the printing operation. The conventional unidirectional printing method for generating the DC motor drive signal is transferred from the second sensing means in the rearward direction of the printer head during the revolving operation of the printhead for the printing operation in the rear direction after the printing operation in the forward direction. DC to sense the position and apply it to print control in the rear word direction By providing a vertical printing method of aligning a bidirectional printer using a motor, it is possible to perform vertical factor alignment with an increase in printing speed according to a bidirectional printing method while using a DC motor.

Description

Vertical factor parade method for both direction printer using DC motor}

The present invention relates to a vertical print alignment method in a printer having a bidirectional printing function. In particular, in the design of a printer capable of graphics, it is possible to match the alignment of the vertical factors using a DC motor without using an expensive step motor. It relates to a vertical print alignment method of a bidirectional printer using a DC motor.

In general, a printer is classified into a line printing method and a page printing method according to the printing method, and a typical printer is called a laser printer as a page printing method, and a dot printer or inkjet is used as a line printing method. -jet) A printer is a typical example.

Laser printers, which are easy to process graphics, have been in the spotlight as multimedia functions have been expanded on the basis of the above-mentioned printers, but non-professional users have recently used inkjet printers with low cost and easy color support when purchasing a print. .

However, since the line printing method has technical limitations that the vertical factor is not accurately aligned as compared with the page printing method, many studies have been conducted for accurate alignment of the vertical factor in the design of a printer having a graphic processing function. It is becoming.

In particular, the line printing method may be classified into a unidirectional printing method and a bidirectional printing method. The unidirectional printing method prints data to be printed while the print head progresses from left to right. On the line it prints from left to right, and on the next line it prints from right to left.

The unidirectional printing method and the bidirectional printing method described above will be described with reference to the accompanying drawings.

1 is a view illustrating waveforms of a printing control signal in a unidirectional printing method, and the control of the printing operation in a state in which a light sensor for aligning the print head and a limit switch for return operation of the print head are provided. This is an exemplary waveform diagram.

Looking at the operation in the unidirectional printing method with reference to the waveform shown in Figure 1, in the conventional unidirectional printer, as shown in the accompanying Figure 1, the transfer of the printer head only at one end of the section in which the print head is transferred A sensor that detects a light sensor, that is, an optical sensor, generates a signal such as a reference number HPS (Home Position Sensor) signal as the print head passes through the optical sensor when the print head is transferred.

At this time, since two encoder sensors are usually provided, a head pin signal indicated by the reference numeral HP through the combination of two encoder signals E1_S and E2_S together with the HPS signal generated through the optical sensor. ) Is generated and the printing position is determined accordingly. Therefore, when the vertical factor is defective corresponding to the generation position of the HPS signal, that is, the assembly position of the optical sensor, the vertical factor is corrected by artificially manipulating the encoder signals E1_S and E2_S.

In addition, unlike the above-described unidirectional printing method, the bidirectional printing method shown in FIG. 2 includes two optical sensors LSL and LSR at both sides of the transfer area of the print head, and transfers the print head according to the printing operation. As the print head passes through the optical sensor, a sensor signal referred to by reference numeral SS is generated. At this time, the encoding signal ES for printing is generated while the SS signal, which is the print head detection signal, is kept low.

Therefore, a head pin signal indicated by the reference number HP is also generated at the time of operation of the encoding signal ES. In FIG. 2, the encoding signal ES and the head pin signal HP control a waveform in the case where the print head passes through the optical sensor LSL located on the left side of the printing area, that is, forward printing. It is a waveform. In general, since the bidirectional printer applies the print control in the forward direction to the print control in the rearward direction, it is not shown in FIG. 2.

However, at present, the assembly accuracy of the optical sensor has an error range of 0.1 mm, and therefore, there is an error of 1/2 dot when viewed from the printing side having a dot size of 0.2 mm. Therefore, in the case of the bidirectional printer, the conventional method has an error range of 1 dot due to the difference in the accuracy of assembling of the optical sensor indicated by reference numeral Ea in FIG. 2. In addition, when the signal generated by the encoder sensor is not synchronized with the signal generated by the optical sensor, an error such as E_ES and E_HP of FIG. 2 is generated and accordingly, an error of about 1 dot is also generated.

Therefore, the bidirectional printing method has advantages over the unidirectional printing method in terms of printing speed of the print, but has disadvantages in terms of vertical printing alignment.

Therefore, in the conventional bidirectional printing method, alignment compensation using a bidirectional printing compensation program is performed to align the vertical printing. For this purpose, a drive motor for transferring the print head is used as an expensive stepper motor.

However, when the DC motor is used without the step motor for the purpose of reducing the production cost, graphic processing was not easy because the vertical factor alignment was not performed correctly in the bidirectional printing operation described above, and the vertical factor alignment was matched. Due to the two-way printing operation is actually close to the one-way printing has caused a problem that the printing speed is significantly reduced.

An object of the present invention to solve the above problems is to design a printer capable of graphics in the forward printing operation in the bidirectional line printing operation to match the alignment of the vertical factor using a DC motor without using an expensive step motor After printing is completed and the printout is reversed, and the print factor is a vertical factor of the bidirectional printer which synchronizes the reset time of the DC motor used for the carrier of the print head by giving a spare time for the print head to return to the home position. To provide a sorting method.

1 is an exemplary waveform diagram of a printing control signal in a unidirectional line printing method;

2 is an exemplary waveform diagram of a printing control signal in a bidirectional line printing method;

3 is an internal structure diagram of a printer to which the present invention is applied;

4 is an exemplary waveform diagram of a printing control signal in the bidirectional line printing method according to the present invention;

<Description of the symbols for the main parts of the drawings>

11 control unit 12 memory

15 head driving unit 16 print head

17: motor drive unit 18: DC motor

19: sensor

A feature of the present invention for achieving the above object, is provided with two sensing means for recognizing the position of the print head on both sides of the printing section, using a DC motor as a transfer means of the print head, in the sensing means A vertical printing alignment method in a bidirectional printer in which a printing operation is performed based on a generated print head detection signal, comprising: a first sensing means for detecting a position of a print head by a first sensing means when the print head is transferred in a forward direction; And a second process of generating the DC motor driving signal for controlling the printing position according to the printing operation when the position of the print head is sensed in the first process, and a printing operation in the rear direction after the printing operation in the forward direction. A third process of returning the print head for the second and a second sense during the regression operation of the print head through the third process A fourth step of detecting a position transferred from the support means in the rear word direction of the print head, and a fourth step of generating the DC motor driving signal for controlling the printing position according to the printing operation when the position of the print head is detected in the fourth step. And a sixth process of matching the vertical factor alignment by adjusting the DC motor driving signals generated through the second process and the fifth process.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

First, briefly look at the internal configuration of the printer according to the present invention of the printer according to the bidirectional line printing method, as shown in the accompanying Figure 3, by receiving the print data from a computer (not shown) to output a print control signal The control unit 11, a head driver 15 receiving a print control signal output from the control unit 11 and outputting a head control signal according to the print control signal, and a head control signal output from the head driver 15. Is applied to the print head 16 for printing by spraying ink according to the applied head control signal, a bias program, a control program (vertical alignment) of the print operation, and the printing applied by the control unit 11. In accordance with the data, the memory 12 for storing the font data required for the print job and the like, and for executing the print program output from the control unit 11. According to the printing signal according to the motor drive unit 17 for outputting the motor control signal and the carrier motor control signal from the motor control signal output from the motor drive unit 17 is applied to the left and right reciprocating motion of the print head 16 DC motor 18 for generating a rotational force for executing the and a sensor unit 19 for sensing the position of the carrier (not shown) by receiving a print control signal output from the control unit 11.

The operation of the bidirectional printer to which the present invention having the above configuration is applied will be described with reference to FIG. 4.

First, the technical idea to be applied in the present invention is the same as the forward direction as well as the rearward direction control technology of the conventional unidirectional printing method based on the optical sensor existing on the right side of the printing area during the printing operation in the rearward direction. To apply.

Therefore, first of all, the reference number HPS (Home Position Sensor) signal according to a process in which the print head passes through the optical sensor when the print head is transferred to the first optical sensor LSL provided on the left side of the printing area in the forward direction. Will generate a signal such as

At this time, the encoder sensor provided around the first optical sensor (LSL) is a head pin signal in the forward direction through the combination of two encoder signals (E1_FS, E2_FS) together with the HPS signal generated through the optical sensor. (Head pin signal) is generated and determines the printing position accordingly. Therefore, when the failure of the vertical factor corresponding to the generation position of the HPS signal, that is, the assembly position of the optical sensor, the failure of the vertical factor is performed by artificially manipulating the encoder signals E1_FS and E2_FS.

In addition, after the printing operation in the forward direction is performed through the above-described process, the print head prepares the printing operation in the rear word direction through a regression section indicated by a dotted line in FIG. 4.

At this time, when a home position sensing signal, also referred to as HPS in FIG. 4 attached from the second optical sensor LSR is generated when passing through the second optical sensor LSR existing on the right side of the printing section, The encoder sensor provided around the second optical sensor LSR is a head pin signal in a rear word direction through a combination of two encoder signals E1_RS and E2_RS together with the HPS signal generated through the optical sensor. (Head pin signal) is generated and determines the printing position accordingly. Therefore, when the failure of the vertical factor corresponding to the generation position of the HPS signal, that is, the assembly position of the optical sensor, the failure of the vertical factor is performed by artificially manipulating the encoder signals E1_RS and E2_RS.

That is, the control unit 11 receives the print data generated and output from the computer (not shown). When the bidirectional printing is executed, the control unit 11 receiving the print data accesses the bidirectional printing program (operational program according to the method shown in FIG. 4) stored in the memory 12.

The bidirectional print control signals HPS, E1_FS, E1_RS, E2_FS, and E2_RS according to the accessed program are applied to the head driver 15 or the motor driver 17. The head driver 15 receiving the bidirectional print control signal outputs a bidirectional head control signal according to the applied bidirectional control signal. The output bidirectional head control signal is applied by the print head 16.

The print head 16 receiving the bidirectional head control signal ejects ink through a nozzle (not shown) according to the applied both head control signals. The ejected ink forms an ink bubble with a medium to print.

At this time, the motor driver 17 receiving the two-sided printing control signal in order to align during bidirectional printing outputs the two-way motor control signal according to the applied two-way print control signal. The carrier motor 18 receiving the output bidirectional motor control signal generates a rotational force for moving the carrier (not shown) on which the print head 16 is mounted left and right.

While the invention has been shown and described in connection with specific embodiments thereof, it will be appreciated that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

By providing a method of vertical printing alignment of a bidirectional printer using a DC motor according to the present invention operating as described above, it is possible to perform vertical factor alignment with an increase effect of printing speed according to a bidirectional printing method while using a DC motor.

In other words, when the DC motor is used without the step motor for the purpose of reducing the production cost, there is a problem that the graphic processing is not easy because the vertical factor alignment is not made correctly in the conventional bidirectional printing operation, and the bidirectional printing operation using the DC motor. In the case of matching the vertical alignment, the printing speed is remarkably lowered since the operation is substantially closer to unidirectional printing.

Claims (1)

It is provided with two sensing means for recognizing the position of the print head on both sides of the printing section, using a DC motor as the transfer means of the print head, and print operation based on the print head detection signal generated by the sensing means In the printing method of vertical printing in a bidirectional printer which performs: A first step of sensing the position of the print head in the first sensing means when the print head is transferred in the forward direction; A second step of generating the DC motor driving signal for printing position control according to a printing operation when the position of the print head is sensed in the first step; A third step of returning the printer head for the printing operation in the rear direction after the printing operation in the forward direction; A fourth step of detecting a position transferred from the second sensing means in the rear word direction of the print head during the revolving operation of the print head through the third step; A fifth process of generating the DC motor driving signal for controlling the printing position according to the printing operation when the position of the print head is sensed in the fourth process; And And a sixth process of matching the vertical factor alignment by adjusting the DC motor driving signals generated through the second process and the fifth process.