KR19990050764A - Print position sensing device of print head - Google Patents

Abstract

The present invention relates to a printing position sensing device of a print head that can easily recognize the initial position and the printing position by changing the shape of the encoder slit, thereby improving print quality.

Encoder slit in which a plurality of slits are formed at predetermined intervals, and is attached to the printer head and outputs a pulse signal according to the slit while moving the upper part of the encoder slit according to the printing operation of the printer head. It comprises an encoder sensor (encoder sensor) and a microcomputer to detect the print position of the print head receives the pulse signal output from the encoder sensor,

The encoder slit is characterized in that the head stop position display slit, the initial position display slit, a plurality of printing interval display slit is formed sequentially.

Description

Print position sensing device of print head

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing position sensing device of a print head, and more particularly, to a printing position sensing device of a print head that senses an accurate initial position when performing a printing operation of a printer.

1 is a view showing a printing position detecting device of the print head according to the prior art.

Referring to FIG. 1, a home sensor 110 mounted at an initial position of the print head A and determining whether the print head A is at an initial position, and a plurality of slits are predetermined. Encoder slit (120) which is formed at regular intervals, and is attached to the printer head (A) and outputs a pulse signal according to the slit while moving the upper portion of the encoder slit 120 in accordance with the printing operation It includes an encoder sensor (130), a microcomputer (not shown) for receiving a signal output from the home sensor 110 and the encoder sensor 130 to detect the printing position of the printer head (A). At this time, reference numeral 140 in FIG. 1 denotes a printer engine for moving the print head A to the printing position.

The interval of the slits formed in the encoder slit 120 is determined according to the printing resolution of the printer.

In the conventional technology configured as described above, when the print data is transmitted to the print head A while the print head A is in the initial position, the motor inside the printer engine 140 is started to start printing. The print head A at the position starts to move to the printing section. In this case, the encoder sensor 130 moves the upper portion of the encoder slit 120 to generate a pulse signal according to the slit formed in the encoder slit 120.

Thereafter, the microcomputer (not shown) detects the printing position by using the recognized current position by receiving an initial position recognized according to the output signal of the home sensor 110 and a pulse signal output from the encoder sensor 130. do.

When the printing position detected by the microcomputer (not shown) reaches a position to start printing, the printer head A is operated by outputting a control signal for starting printing.

When printing is completed, the print head A is moved toward the initial position by the operation of the printer engine 140, and a signal indicating that the print head A has reached the initial position is output from the home sensor 110. When the print head (A) is stopped.

However, the printing position sensing device of the conventional print head as described above recognizes an initial position by the operation of the home sensor 110, and the pulse signal output from the encoder sensor 130 based on the initial position. Since the printing position is counted to recognize the printing position, it is difficult to detect the printing position when any one of the sensors malfunctions, thereby reducing the reliability of the printing operation.

In addition, when an error of the pulse signal output from the encoder sensor 130 is generated, there is a problem in that the initial position and the printing position error occurs so that the printing start position is not aligned in the printed document.

The present invention has been made to solve the above problems, the object is to remove the home sensor and change the shape of the slit to facilitate the recognition of the initial position and the print position of the print head that can improve the print quality To provide a printing position sensing device.

1 is a view showing a configuration of a printing position detecting device of a print head according to the prior art,

2 is a view showing the configuration of the printing position detecting apparatus of the print head according to the present invention;

Figure 3 is a block diagram showing the configuration of a printing system to which the printing position detection device of the print head according to the present invention is applied.

<Description of Symbols for Main Parts of Drawings>

220: encoder slit 230: encoder sensor

221: Slit for displaying the head stop position 222: Slit for displaying the initial position

223: print section display slit 310: position detection unit

320: controller 330: print head

340: motor drive unit

In order to achieve the above object, the present invention provides an encoder slit in which a plurality of slits are formed at predetermined intervals, and attached to a printer head, and the encoder slit according to a printing operation of the printer head. Printing position detection of the print head including an encoder sensor for outputting a pulse signal according to the slit while moving the upper portion of the printhead, and a microcomputer for detecting the printing position of the print head by receiving the pulse signal output from the encoder sensor. In the device,

The encoder slit provides a print position detecting apparatus of a print head, characterized in that the head stop position display slit, the initial position display slit, and a plurality of print section display slits are sequentially formed.

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

2 is a view showing the configuration of the printing position detecting apparatus of the print head according to the present invention.

Referring to FIG. 2, an encoder slit 220 having a plurality of slits formed at predetermined intervals, attached to a printer head A, and printed according to a printing operation of the printer head A is provided. The encoder sensor 230 for outputting a pulse signal according to the slit while moving the upper portion of the encoder slit 220, and receives the pulse signal output from the encoder sensor 230 of the printer head (A) Microcomputer (not shown) for detecting the printing position.

In this case, the encoder slit 220 is formed by sequentially forming the head stop position display slit 221, the initial position display slit 222, and a plurality of printing section display slits 223. It is formed differently.

In the above, the front portion of the initial position display slit 222 is referred to as a holding section, and the rear portion thereof is called a printing section.

According to the present invention configured as described above, when the motor inside the printer engine 240 is driven while the print head A is at the start position of the holding section, that is, the head stop position display slit 221, the print head ( When A) starts to move and the encoder sensor 230 detects the initial position display slit 222, it determines that the printing section starts. In this case, after passing through the initial position display slit 222, the encoder sensor 230 generates a pulse signal in accordance with the printing section display slit 223 formed in the encoder slit 220 to display a microcomputer (not shown). ) Will detect the print position.

On the other hand, Figure 3 is a block diagram showing the configuration of the printing system to which the printing position sensing device of the print head of the present invention is applied.

Referring to FIG. 3, a position sensing unit 310 for detecting an initial position and a printing position, a controller 320 for controlling the operation of the system according to the output signal of the position sensing unit 310, and the position sensing unit When the output of the 310 is a position to print, the print head receives the print data from the controller 320 to perform printing, and the control signal of the controller 320 when the printing operation is completed. In accordance with the present invention comprises a motor driving unit 340 for moving the print head 330 to the initial position.

The printing system configured as described above, when the position detecting unit 310 detects and outputs an initial position and a printing position, the controller 320 prints the print head when the current printing position matches the printing position. The print data is transmitted to 330 so that printing is performed.

After the printing operation is completed, the controller 320 outputs a control signal to operate the motor driving unit 340 to move the printer head 330 to the holding section, and then the top of the head stop position display slit 221. Stop at

As described above, the printing position sensing device of the print head of the present invention eliminates the configuration of the home sensor in the related art, thereby simplifying the construction, thereby reducing manufacturing cost, and reducing the occurrence of errors, thereby increasing reliability of the printing position detection. There is an effect to improve.

Claims (1)

Encoder slit in which a plurality of slits are formed at predetermined intervals, and is attached to the printer head and outputs a pulse signal according to the slit while moving the upper part of the encoder slit according to the printing operation of the printer head. In the print position sensing device of the print head comprising an encoder sensor and a microcomputer receiving the pulse signal output from the encoder sensor to detect the print position of the print head, The encoder slit is a printing position sensing device of the print head, characterized in that the head stop position display slit, the initial position display slit, a plurality of printing interval display slit is formed sequentially.