JPH01186369A - Double side recording printer - Google Patents

Abstract

PURPOSE:To print simultaneously on both sides of printing paper by a method wherein the title double side recording printer is so controlled that normal printing patterns are printed when the front side of the printer paper is printed by a front side ink ribbon and that inversed printing patterns are printed when the rear side of the printing paper is printed by a rear side ink ribbon. CONSTITUTION:Ink ribbons 2, 3 mounted on a printer body 1 are composed of band parts 2a, 3a whereinto ink is infiltrated and band parts 2b, 3b whereinto ink is not infiltrated. The structure is that each of ink infiltrated part 2a, 3a is positioned to be opposed to the other ink non-infiltrated parts 3b, 2b by pinching this paper between them on the surface side and the rear side of the printing paper 4. Besides, cartridges 2c, 3c are simultaneously vertically shifted by an ink ribbon shift controller 5. The printing head 6 is opposed to the ink infiltrated part 2a and the ink non-infiltrated part 3b when ink ribbons 2, 3 are shifted up, and is opposed to the ink non-infiltrated part 2b and the ink infiltrated part 3a when shifted down. Therefore, printing can be simultaneously performed on both sides of the printing paper by one feeding of paper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot printer that prints on printing paper using printing patterns such as characters, symbols, images, etc.

[Prior Art] Conventional dot printers print on each side of printing paper, so if you want to print on both sides of the paper to save printing paper or for other reasons,
First, it was necessary to print, for example, one odd-numbered page on the front side, then turn the printing paper over and set it in the printer again, and then print the other even-numbered page on the back side.

[Problems to be Solved by the Invention] In such a printer, when printing one character on both sides of printing paper, each side must be printed separately, which requires a lot of printing time. Not only does this increase the number of times printing paper is set in the printer, but when setting it, care must be taken to ensure that there are no mistakes in the top and bottom, front and back sides of the printing paper, and even in the set position, resulting in poor operation and performance.
``The present invention solves the above problems, and -
To provide a printer which can simultaneously print on both sides of a printing paper by feeding paper at the same time and has good operability.

[Means for Solving the Problem] In order to achieve the above object, the present invention provides characters, symbols,
A dot with a printing section that prints on printing paper using a printing pattern such as an image] - In a printer, there are two types of printers: a part of the band soaked with ink and a part of the band not soaked with ink.
An ink ribbon shaped like X, and each of these two ink ribbons are placed on the front and back sides of the printing paper, with the paper being sandwiched so that the part of the band soaked with ink and the part of the band not soaked with ink face each other. a mechanism for switching the printing surface of the printing paper by relatively moving the position of the printing section and the ink ribbon facing the printing section;
When the printing section prints with the ink ribbon on the front side of the printing paper, it prints on the printing paper according to the Moeki printing pattern, and when printing with the ink ribbon on the back side of the printing paper, the printing pattern is reversed and the printing paper is printed. and means for controlling the printing so that it prints on the image.

[Function] With the above configuration, the positions of the printing section and the ink ribbon facing it are moved relatively, and when the printing section moves from left to right, the ink on the ink ribbon located on the front side of the printing paper is changed. Print on the front side according to the print pattern through the soaked part of the band, and when the print part moves from right to left, turn the print pattern over and print on the back side by using the soaked part of the ink ribbon located on the back side of the printing paper. to be printed.

[Embodiment] FIGS. 1 and 2 show the configuration of an embodiment of the present invention, in which two ink ribbons 2 and 3 are attached to the printer main body 1, and the ink ribbons are inserted between the ink ribbons 2 and 3. Print paper 4
is set.

One of the ink ribbons 2 is used for printing on the front side of the printing paper 4, and the other ink ribbon 3 is used for printing on the back side of the printing paper 4. These ink ribbons 2 and 3 consist of band portions 2a and 3a that are soaked with ink (ink permeable portions) and band portions that are not soaked with ink (ink impermeable portions) 2b and 3b.
The paper is sandwiched between the front surface and the back surface of the sheet, and each ink permeable portion 2a, 3a is positioned opposite to the other ink impermeable portion 3b, 2b.

Further, these ink ribbons 2 and 3 are provided in cartridges 2c and 3c, respectively, and are provided in cartridges 2c and 3''c.
The ink ribbon shift control device 5 shifts the ink ribbon up and down together. That is, the ink ribbon 2.3 is shifted to one side or downwards,
Ink ribbons 2 and 3 facing the print head 6 (printing section)
With this mechanism, the position of the print head 6 and the ink ribbons 2 and 3 facing it can be relatively moved, so that the print surface of the print paper 4 is turned to the front side. and the back side.

More specifically, when the ink printers 2 and 3 shift up, the print head 6 is inserted into the ink permeable part 2a and the ink impermeable part 3b, and when they shift down, the print head 6 is installed in the ink impermeable part 2b and the ink permeable part 3a, respectively. It is configured to face each other.

The print head 6 is connected to the platen 7 via the ink ribbon 2.3.
In addition, a paper size detection sensor 8 made of a photo sensor or the like is provided integrally with the print head 6, and the print head 6, ink ribbon cartridge 2C, and paper size detection sensor 8 are integrally controlled to move left and right during printing. is configured to be

Figure 3 shows the block configuration of this printer, including a CPU 11 (means for controlling printing) that performs arithmetic processing and control, a ROM 12 that stores data such as programs and constants used in the programs, and buffers, variables, etc. RAM 13 that stores data, and CGR that stores character patterns.
OM 14, a device 15 that controls the print head 6, a motor control device 18 that controls the line feeder (LF) motor 16 that feeds between lines and the carriage motor 17, and an ink ribbon that shifts the ink ribbon cartridges 2c and 3c up and down. A shift control device 5, a print data receiving device 18 for receiving and receiving print data from the outside, and a paper empty (PF) sensor 1 for monitoring the presence or absence of printing paper 4.
and a sensor control device 20 that controls a sensor 8 for measuring the size of printing paper.

Figure 4 shows how to read out the receive buffer, and print character data from the outside is stored in the receive buffer/71 of RAM
Two pages (front and back) are stored in 3a, and then
The read pointer FS for the front page and the read pointer R8 for the back page are read from the buffer into the CPU II, and predetermined processing as described later is executed. In addition, FE.

RE indicates the end of the read pointer for the front and back pages, respectively, and the zigzag arrow indicates the movement locus of the pointer.

Next, the operating procedure will be explained using FIGS. 5 to 8. First, the overall processing flow will be explained with reference to FIG. 5. In step S1, the buffer? In step S2, a data reception interrupt processing routine is started, and the data received by this interrupt processing routine is written into the reception buffer. Next, in step S3, an interrupt routine for bit pattern printing is activated, and thereafter, printing processing by interruption is executed. In step S4, an operation to check the origin position of the print head is performed as an initial operation process, in step S5, the printing paper already in the printer is ejected, and in steps Ss and S7, the character code data of the front page and back page of the reception buffer is In step S8, wait until data for two pages has accumulated in the reception buffer. When data for two pages has accumulated, proceed to step S9, where new printing paper is fed. Then, in step S10, a process (described later) for measuring the size of the printing paper (:?-gin) is called.

After this printing paper engine measurement process, step S11
In step S12, a one-line printing process (described later) for the front page is called, and after this process, the back page 1 is printed in step S12.
Line printing processing (described later) is called, and after this processing, a line feed (L F > operation is performed in step 313), and in step S14, it is checked whether printing for one page has been completed for both the front page and the back page. , if one page's worth of printing has not yet been completed on both the front and back pages, repeat steps S11 to S13.Also, if one page's worth of printing has already been completed on both the front and back pages. For example, return to step $5 above and print the next front page and back page.

In the process of measuring the size of the printing paper in step S1o, as shown in FIG. 6, step S21.
By moving the print head 6 (FIGS. 1 and 2) from left to right in S22, the size of the print paper 4 is measured by the paper size detection sensor 8 attached to the print head 6, and the size of the print paper 4 is measured in step S823. The right end position is stored in the memory, and the process returns to step S11.

In the one-line printing process for the front page in step S11, as shown in FIG. 7, it is checked in step S31 whether printing of the front page has already been completed. The one line printing process is completed and the process returns to step S12, but if there are still unprinted lines remaining, the process moves to step 832, the print head 6 is moved to the left margin position, and in step S33, The ink ribbons 2 and 3 are shifted upward by the ink ribbon shift control device 5, and in step S34, the front page read pointer reads the print data in character code from the reception buffer, and in step S35, the character code read above is read from the CGROM 14. Read the bit pattern of the character corresponding to .

Next, in step S36, the data read in step S35 is transferred to the print head 6 in the forward direction, that is, from left to right.
One character is printed while moving, the front page read pointer is updated in step S37, and the front page read pointer is updated in step S37.
In step 38, it is determined whether one line of printing has been completed, and if one line of printing has not been completed yet, step 33
Steps 4 to S37 are repeated until printing for one line is completed, and if printing for one line has already been completed, the process for printing one line on the front page is completed and the process returns to step S12.

In the one-line printing process for the back page in step S12, as shown in FIG. The printing process for one line of the page is completed and the process returns to step S13, but if there are still unprinted lines, the process moves to step S42.

In step S42, the print head 6 is moved to the left by the left margin from the right edge of the printing paper stored in step S23, and in step S43, the ink ribbons 2 and 3 are shifted downward, and step S44
At step S45, the back page read pointer reads the print data in character form from the reception buffer, and at step S45, the pit pattern of the character corresponding to the character code read at step 344 is read from the CGROM14.

Next, in step S 546, the pit pattern read in step S45 is turned over left and right, and the pit pattern is turned over in step S45.
47, the left and right turned pit pattern is printed 1 while moving the print head 6 in the opposite direction, that is, from right to left.
Characters are printed and the back page read pointer is updated in step 348.

Further, in step S49, it is determined whether printing for one line has been completed, and if printing for one line has not been completed, steps S44 to S are repeated until printing for one line has been completed, and If printing for one line has been completed, the process for printing one line on the back page is completed and the process returns to step S13.

Looking at the printing operation for each line through steps 1 to 10, first, the ink ribbon 2.3 is shifted up and the print head 6 is in a state facing the ink permeable part 2a and the ink impermeable part 3b. As the print head 6 moves from left to right, one line is printed one character at a time on the front side of the printing paper 4, and then the ink ribbons 2 and 3 are shifted down and the print head 6 moves to the ink impermeable part 2b. , the print head 6 is in a state facing the ink permeation part '3a, and while moving from right to left in the closed state, the print head 6 is placed at the same height position as the above-mentioned one line on the back side of the print paper 4 with the print pattern reversed. Each character will be printed on one line.

In the above example, the ink ribbons 2 and 3 are shifted up or down to change the part of the ink-soaked band facing the print head 6 to change the print surface. The print head 6 may be configured to shift relative to the ink ribbon 2.3, thereby switching the printing surface.

Further, as the print head 6, a print pattern is used.
In addition to the impact method using a dot matrix, various methods such as a thermal transfer method using a laser beam can be used. Note that in the case of using this laser beam, a light-transmissive printing paper may be used as the printing paper.

[Effects of the Invention] As described above, according to the present invention, two ink ribbons each consisting of a band portion soaked with ink and a band portion not soaked with ink are applied to the front and back sides of printing paper. The part of the band soaked with ink and the part of the band not soaked with ink are positioned so as to face each other, and the printing part and the position of the ink ribbon facing it are relatively moved to switch the printing surface on the printing paper, When printing on the front side of the printing paper in the printing section, it prints according to the printing pattern, and when printing on the back side, the printing pattern is reversed, so -
It is possible to print on both sides of the printing paper at the same time by feeding the paper at the same time, which reduces printing time and eliminates the trouble of resetting the printing paper in the printer. There is no need to be careful, and operability can be improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a printer according to an embodiment of the present invention, Fig. 2 is a perspective view of the main parts, Fig. 3 is a block diagram of the printer, and Fig. 4 explains the data reading operation of the printer. 1 and 5 to 8 are flowcharts showing the printing operation procedure of the same printer. 1... Printer body, 2, 3... Ink ribbon, 2
a, 3a... part of the band soaked with ink, 2b. 3b... Band portion where ink does not soak, 4... Printing paper, 5... Ink ribbon shift control device, 6...
・Print head (printing section), 11... CPU (control means), 12... ROM, 3...
RAM, 14-=CGROM. Patent applicant Agent: Brother Industries, Ltd.
Patent Attorney Etsushi Kotani Patent Attorney Cho1) Seido Patent Attorney Yasuo Itaya

Claims (1)

[Scope of Claims] 1. In a dot printer having a printing section that prints on printing paper using a printing pattern such as characters, symbols, images, etc., a band portion soaked with ink and a band portion not soaked with ink. and this ink ribbon 2.
a mechanism for positioning each book on the front and back sides of the printing paper so that the paper is sandwiched between the ink-soaked band portion and the ink-unsoaked band portion to face each other; and the printing unit; a mechanism for switching the printing surface of the printing paper by relatively moving the position of the ink ribbon facing the printing paper; 2. A double-sided recording printer characterized by comprising means for controlling the print pattern to be printed on the printing paper by turning over the printing pattern when printing with an ink ribbon on the back side of the printing paper.