KR970003650B1 - Detecting apparatus of sheet length - Google Patents

Abstract

Disclosed is a method for setting a length of paper within a printer. The method comprises 4 steps. In the 1st step, a paper length is set by a setting switch. In the 2nd step, the counting value is set as "0" when the paper is sensed by a sensor 29 during the paper is moved by LF motor 31. In the 3rd step, a counting value is stored when the paper is sensed to passed out by the sensor 29. In the 4th step, a paper length is stored to the EEPROM 35 as a result of multiplying the counting value stored with an unit distance set. Thereby, a continuous setting of the paper is performed automatically.

Description

How to set paper length

1 is a block diagram showing the structure of a conventional printer.

Figure 2 is a block diagram showing the structure of the printer of the present invention.

Figure 3 is a detailed view of the platen peripheral paper feeder of the printer of the present invention.

4 is a paper sensor circuit diagram of the platen peripheral paper feeder of the present invention.

5 is a flowchart showing a paper length actual process of the present invention.

* Description of the symbols for the main parts of the drawings *

21: CPU22: program ROM

23: RAM 24: Font ROM

25 display unit 26 host unit

27: interface unit 228: limit switch

29: sensor unit 30: setting switch

31: LF motor 32: CR motor

33: head solenoid 34: gate array portion

35: EEPROM

According to the present invention, when the paper is continuously copied using a printer, the length of the paper is set by the paper length setting data stored in the EEPROM when the paper is stored in the EEPROM after the power is turned off. It relates to a paper length setting method that allows paper to be copied continuously without setting.

The conventional printer includes a CPU 1 for controlling the entire printer as shown in FIG. 1, a program ROM 2 in which a processing program of the CPU 1 is stored, a font ROM 4 in which respective character forms are stored, A RAM (3) for storing and outputting the data signal output from the CPU (1) and the character data signal output from the font ROM (4), a display unit (5) for displaying the current status of the printer, and a page turning instruction. The interface unit 7 which transmits and receives the data signal of the host unit 6 to the printer to the CPU 1, the limit switch 8 which selects the amount of paper to be copied, and the paper to be copied A sensor unit 9 for sensing, a power switch 10 operating on / off to supply power to the printer, a LF (Ling Feed) motor 11 for feeding the paper to be copied, and a paper for copying the print head CR (Carriage Return) motor 12 to transfer to the position of the, and the head solenoid to print characters on the conveyed paper (13), and the gate array unit 14 for controlling each part of the printer by the output signal of the CPU (1).

In the conventional printer configured as described above, as shown in FIG. 1, first, the user applies power to the printer by turning on the power switch 10 to copy the paper. At this time, when the data signal output from the host unit 6 is applied to the gate array unit 14 through the interface unit 7, the output data signal of the host unit 6 applied to the gate array unit 14 is the data It is applied to the CPU 1 via the bus and the address bus.

The CPU 1 determines whether the data signal inputted through the program stored in the program ROM 2 is print data or command data. As a result of the determination, the character data signal output from the font ROM 4 is stored in the RAM 3.

Thereafter, the gate array unit 14 controls the display unit 5, the interface unit 7, the limit switch 8, the sensor unit 9, and the like at intervals set by the timer by the signal output from the CPU 1. After that, if the data signal of the CPU 1 and the character data signal outputted from the font ROM 4 are sufficiently stored in the RAM 3, the gate array unit 14 controls the LF motor 11 and the CR motor 12. Drive to transfer the paper and print head to the desired position.

The paper conveyed in this manner and the print head print text on the paper conveyed by the head solenoid 13. If a page turning command is input to the printer after the printing of the paper is completed, the CPU 1 prints the immediately preceding data and then prints the next data to the next sheet. The host unit 6 then sends the page turning command to the printer.

In other words, when the printer transfers the length of the set paper in the longitudinal direction by the length minus the current printing position of the paper leading edge, the printer determines the position of the transferred paper as the paper leading edge of the next paper and prints the next paper. .

However, in the conventional printer, the paper length is fixedly set so that the page turning command does not work when using paper larger than the length of the paper, and when the paper turning command is used, the paper length larger than the length of the set position is used. When the paper is fixed to the length of the paper fixedly set in the printer, there is a problem in that the leading position of the currently transferred paper and the leading position of the paper to be transported next are not constant.

The present invention is provided with a paper length setting switch and EEPROM to solve the conventional problems, such that the user can set the length of the paper arbitrarily and store in the EEPROM to perform the pager page command function and turn off the power again When printing paper, once the paper is set, the paper length data value stored in the EEPROM is read and reused without the need to set the paper length again. Referring to the configuration and effect of the present invention by the accompanying drawings as follows.

First, as shown in FIG. 2, the printer of the present invention has a CPU 21 for controlling the entire printer, a program ROM 22 in which a processing program of the CPU 21 is stored, and a font ROM in which respective character forms are stored. (24), a RAM (23) for storing and outputting the data signal output from the CPU (21) and the character data signal output from the font ROM (24), a display section (25) for displaying the current status of the printer, A host unit 26 for transmitting a page turning command to the printer, an interface unit 27 for transmitting and receiving data signals from the host unit 26, a limit switch 28 for selecting the amount of paper to be copied, and , The sensor unit 29 for detecting the transfer oil and the absence of paper, the setting switch 30 for setting the length of the paper when transferring the paper to the printer, the LF motor 31 for transferring the paper to be copied, and the print head. CR motor 32 for transferring to the position of the paper to be copied, and head soleno for copying characters to the transported paper And a gate array unit 34 for controlling each unit of the printer by the output signal of the CPU 21, and an EEPROM 35 for storing the paper length set by the setting switch 30. will be.

On the other hand, the paper conveying apparatus of the printer, as shown in Figure 3, the tractor unit 40 for fixing the paper so that the continuous paper is transferred to the printing position, and the guide unit for guiding the fixed paper to the platen 42 (41), a paper sensor unit (29) for detecting the presence or absence of paper conveyed by the guide unit (41), and a plate for transferring the paper so that characters are copied to the paper detected by the sensor unit (29). It consists of a turn unit 42 and a head solenoid 33 for determining the printing form to copy the transferred characters, the sensor unit 29, as shown in Figure 4, the resistance (R1) (R2) and It consists of a photodiode D1 and a phototransistor Q1.

The operational effects of the present invention configured as described above will be described below with reference to FIG.

First, the user fixes the continuous paper to the tractor unit 40 so that the paper is copied through the printer, and then turns on the setting switch 30 to set the length of the paper to be copied. At this time, the gate array unit 34 drives the LF motor 31 to feed the paper until the paper to be copied is detected by the paper sensor unit 29 by the setting signal selected by the setting switch 30. When the paper to be copied is detected by the paper sensor unit 29, "0" is applied to the paper detection instant counter, the LF motor 31 is driven one step, and the sensor unit 29 determines whether the paper is detected or not. . As a result of determination, if the sheet is not detected by the sensor unit 29, "1" is added to the counter again, and the LF motor 31 is driven one step again to determine whether the sheet copying is completed. If the paper copying has not been completed yet, the counter is increased by " 1 " while driving the LF motor 31 by one step, and the above operation is repeated until the paper copying is completed. If the paper to be copied passes through the sensor unit 29, the sensor unit 29 does not detect the paper, so the value counted from the time when the sensor unit 29 detects the paper to the time the paper passes through is determined by the leading edge of the paper. The total number of pulses of the LF motor 31 required to move to the end of the sheet is obtained, and the total length of the sheet to be copied can be detected by multiplying the pulse by the conveying distance of the sheet per pulse. In other words, the length PL of the paper is the paper feed distance L per counter * unit pulse.

The total length of the paper detected in this way is stored in the EEPROM 35 so as to be set as the next paper length reference data, so that when the user wants to reuse the printer after turning off the printer, the total paper length is stored in the EEPROM 35. You can make a continuous copy.

As described above, when copying paper, the length of paper to copy is set by setting switch and saved in EEPROM. When user copies the same paper previously set after turning off the printer, set the paper length saved in EEPROM. The data can be continuously copied without resetting the length of the paper to be copied at the present time, thereby improving the reliability of the product.

Claims (1)

After the paper is fixed to the tractor unit 40 to copy the paper, the first process of setting the paper length by turning on the setting switch 30 so that the length of the paper to be copied is set, and the paper fixed to the tractor unit 40. The second process of recognizing the counter value as "0" when the paper is detected by the paper sensor unit 29 by driving the LF motor 31 so that the paper is conveyed, and when the counter value is increased by "1", the LF motor ( 31) is continuously driven by one step, and the third process of storing the counter value when paper detection is turned off by passing the paper through the paper sensor unit 29, and when the paper passage is detected by the paper sensor unit 29 And a fourth process of storing the total length of the detected paper in the EEPROM (35) by multiplying the total counter value of the paper by the feed distance of the paper per pulse.