JPS6054872A - Method and apparatus for perfect printing - Google Patents

Abstract

PURPOSE:To enable to accurately print and read, by a method wherein an index mark is printed on the leading end of a paper when printing on the face side of the paper, and the paper is supplied in the state of being turned by 90 deg. and printing data are printed in the state of being turned by 90 deg. by a mark sensor signal when printing on the back side of the paper, in an information-processing printer. CONSTITUTION:When printing on the face side of a printing paper 15, when the leading end 15b is detected by a photoelectric sensor 12, a printing head 2 prints an index mark 23 from the position spaced by a distance A from the left side of the paper 15, and the mark 23 is checked by reading it by a mark sensor 13. When printing on the back side of the paper 15 printed with data 24, the paper 15 is supplied to the printer in the state of being turned by 90 deg., and after the paper 15 is fed by the distance A from the moment the leading end 15a is detected by a mark sensor 22, reading of the mark 23 is started, whereby the mark 23 can be read in the same positional condition as in printing. Based on the data thus read, the printing data 25 are printed on the back side of the paper 15 in the state of being also turned by 90 deg.. Accordingly, the index mark can be accurately printed and read.

Description

Detailed Description of the Invention - Technical Field of the Invention The present invention relates to a method for printing mutually corresponding data on the front and back sides of printing paper using a printer of an information processing device, and a method suitable for performing print processing using this method. It is related to printers.

-Technical background Printers for information processing devices generally have a structure that prints only on one side of the printing paper inserted. Therefore, when printing on both sides of a sheet of paper, it is necessary to print on one side, then turn the sheet over and insert it into the printer again. In this case, if the paper is printed one by one while being turned over one by one, the printing process becomes extremely complicated and requires a large amount of processing time. Therefore, printing is performed on the front and back sides of the paper at the same time. method is adopted.

Normally, the data printed on the front and back sides of paper have a certain correspondence relationship, so when printing on the front and back sides of the paper is performed all at once, The problem is how to establish the correspondence between the data printed on each sheet.

・Conventional technology and problems As a method of matching the data printed on the front and back sides of a paper, the method commonly used in the past is to make the data printed on the front and back sides of the paper the same. In this method, the sheets are arranged in the order of , and the back side is printed in the same order as the front side is printed. However, in this case, if even one sheet of paper is replaced or a double feed occurs, there is a risk that all the data printed on the subsequent paper will be inconsistent. One of the complications is that the operator has to frequently check the correspondence of the print data during the IT stamp notification process.

One way to automatically match the data printed on the front and back sides of printing paper is to print an index mark that corresponds to the back print data when printing on the front side, and then read that index mark with a mark sensor when printing on the back side. There is a method to print the data corresponding to this. However, since the printer's print head prints these index marks in the row direction (direction perpendicular to the paper feeding direction), in order to read the index marks when printing on the back side, it is necessary to place them on the bottom of the paper path. It is necessary to run the mark sensor in the row direction, which not only makes the device complicated and expensive, but also because the index mark is generally printed at a position relative to the left side of the paper when printing on the front side. When printing on the back side, it is necessary to read this index mark from the right side of the paper (left side when viewed from the bottom), and the position of the right side of the paper changes depending on the paper dimensions, so it is necessary to set the reference position when reading the mark. This may become difficult, and there is a risk that erroneous reading may occur due to noise signals. In addition, if you try to fix the mark sensor in the paper path and read the index mark while feeding the paper, the index mark will be placed at the position based on the right side of the paper when printing on the front side. This creates a problem in that printing must be done in the same direction, which not only makes the printing procedure extremely complicated, but also makes it difficult to print clear marks at accurate positions.

・Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and includes a mark sensor in a method of automatically matching data printed on the front and back sides of paper using the index marks. It is an object of the present invention to provide a printer suitable for implementing a method and a packing method that can read index marks while keeping the index mark fixed, and that can easily and accurately set the printing and reading position of the index marks. It is something to do.

・Structure of the Invention The double-sided printing method of the present invention is characterized in that one part of the data is printed on the surface of the printing paper.
During the 31st printing, an index mark corresponding to the data is printed along the leading edge of the paper, and when printing on the back side of the paper, the paper is turned 90 degrees and fed to the printer to serve as a reference for the printer's paper supply path. The index mark is read by a mark sensor mounted at a fixed position on the lower surface of the edge, and print data corresponding to the read signal is outputted at 90
It is characterized by printing by rotating.

That is, when printing on the front side, index marks are printed in the line direction (the running direction of the print head) at predetermined positions based on the leading edge of the paper and the reference edge (the left side of the paper in normal printers), and when printing on the back side, the index marks are printed in the row direction (the running direction of the print head). The index mark is inserted by turning the paper over and turning it 90 degrees, and inserting it into the printer with the leading edge of the paper when printing on the front side as the reference edge, and the reference edge of the paper when printing on the front side with the leading edge. When printing on the back side, the print data is also turned 90 degrees to correspond to the fact that the paper is turned 90 degrees and inserted. It is designed so that it can be printed.

Further, in the printer of the present invention, a mark sensor is installed near the print head that performs printing processing while traveling in a direction perpendicular to the feeding direction of printing paper, and a mark sensor is mounted at a fixed position on the lower surface of the reference edge side of the paper supply path. A sensor is attached, and when printing data based on the read signal of the mark sensor provided on the bottom surface, the output data received from the main unit is turned 90 degrees and printed. In addition to having a mark sensor and print data converting means necessary for carrying out the method of the present invention, a mark sensor is provided near the print head, and the mark sensor reads the index mark immediately after printing processing. By making it possible to check the information, more accurate printing processing can be guaranteed.

Embodiments of the Invention Next, the method and apparatus of the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a side view showing a mechanical part of a printer according to the present invention, and FIG. 2 is a perspective view of the main part. In the figure, 1 is a platen mounted on the frame of the printer and extending in the row direction, and 2 is a print head.

The print head 2 is attached to a carriage 4 via a bracket 3. The carriage 4 slides on two guide rods 5 and 6 mounted parallel to the platen 1, and the guide rod 6 has grooves 7 carved therein as shown in FIG. The spiral groove 7 is engaged with a projection (not shown) provided on the carriage 4, and by rotating the guide rod 6, the carriage 4 and the print head 2 are moved back and forth in the row direction.

The printer shown in the figure is capable of processing both continuous paper and single-cut paper, and has an N8 roller system for feeding single-cut paper.
, 9, a tractor 10 for feeding continuous paper, and a branch guide 11 for switching the paper ejection route. The branch guide 11 is in an inclined state as shown by the solid line in the figure when processing cut sheets, and guides the paper sent from the roller unit M9 to a stacker (not shown) provided below, and when processing continuous sheets. The paper is guided to the tractor 10 in a horizontal position as shown by imaginary lines in the figure.

12 is a photoelectric sensor that detects the leading edge of a cut sheet to locate the beginning of the sheet; 13 is a mark sensor provided near the print head 2; As shown in FIG. 2, this mark sensor 13 is attached to a bracket 14 extending from the carriage 4 and is located near the print head 2, and travels together with the print head 2 to touch the surface (printing surface) of the print paper 15. This is to read the attached index mark. 16,1
7 and 18.19 are the rollers ff1 for the paper to be inserted.
18 and guide plates that guide the paper between the platen 1 and the print head 2, respectively, and form a paper supply path 20, 21. 22 is a mark sensor provided on the lower surface of the paper supply path 21.

The printing paper 15 is fed with its left side 15a guided by a side guide (not shown), and the mark sensor 22 is guided from the guide edge of this side guide (corresponding to the position of the left side of the paper 15). The mark sensor 22 is mounted so that the distance from the photoelectric sensor 12 for cueing to the printing position is equal to the distance from the photoelectric sensor 12 for cueing to the printing position.

Next, a printing method using the printer configured as described above will be described.

When printing on the surface of the printing paper 15, as shown in FIG.
At the cue position detected in , the print head 2 is moved along the guide rods 5 and 6 to print the index mark 23 from a position a predetermined distance A from the left side of the paper 15 . Print predetermined data on the surface.

This print data and the index mark 23 printed on the paper must be associated with each other by the main unit of the information processing apparatus. When printing the index mark 23, the mark sensor 13 reads and checks the index mark 23 immediately after printing. For example, if the density of the mark 23 is low and there is a risk of misreading, is restored and the printing operation of the mark 23 is performed again. The surface of the paper on which the index mark 23 and data 24 are printed in this way becomes as shown in FIG.
The position is from a to A.

Next, when printing the back side of this paper 15, turn the paper 16 over as shown in FIG. Side 15a that was the left side when printing the front side by guiding
Insert it into the printer using the leading edge. Then, the index mark 23 printed at the time of front side printing is transferred to the paper supply path 2.
Since the position of the mark sensor 22 provided at the index mark 23 is exactly passed by, the mark sensor 2, g, detects the leading edge of the paper and the paper is fed by the distance A before the index mark 23 is detected. Once the reading operation is started, the index mark 23 can be read under the same positional conditions as when it was printed, and the conversion of the read information into an electrical signal and its verification can be performed very easily. When printing this back ml, the paper 15 is turned 90 degrees and inserted, so the data 25 printed on the back side is also 90 degrees.
Print in a rotated position. Since the printing end 2 of recent printer devices are all of the dot matrix type, turning the print data by 90 degrees can be easily performed using a microprogram.

In addition, in the above description, for convenience of explanation, the photoelectric sensor 12
The position where the leading edge 11)b of the paper was detected was taken as the cueing position; however, in reality, it is often difficult to install the photoelectric sensor 12 at the position shown in the figure due to interference with the carriage 4, etc. In that case, the position where the leading edge 15b of the paper is detected by the photoelectric sensor provided in the paper supply path 21 and the paper is fed a predetermined distance is set as the cue position. In any case, since the index mark 23 is printed at a predetermined cue position, such a structure does not pose any problem in implementing the method of the present invention. Note that since the printer of the present invention is provided with a mark sensor 22 in the paper supply path 21, this mark sensor 22 can detect the leading edge 15b of the paper to perform cueing, and the photoelectric sensor 12
can also be omitted.

- As described in detail, according to the present invention, index marks for matching data printed on the front and back sides of printing paper can be printed and read very simply and accurately. Since the mark sensor for reading the index mark can be fixedly installed, the structure of the device is simple, and the index mark can be checked immediately after printing and reprinting can be performed if necessary. This makes it possible to avoid misreading due to poor printing of marks.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side view showing the mechanical part of the printer, Fig. 2 is a perspective view of the main parts, and Fig. 3 is a side view showing the mechanical part of the printer.
The figure is a plan view showing the state of printing on the front side of the paper, and FIG. 4 is a plan view showing the state of printing on the back side of the paper. In the figure, 1 is a platen, 2 is a print head, 4 is a carriage, 5 and 6 are guide rods, 12 is a photoelectric sensor, 13 is a mark sensor, 15 is a printing paper, 1°5a is its left side (reference edge), 15b is its leading edge, 21 is the paper supply path, 2~
2 is a mark sensor, 23c is a t index mark, 2
4.25 is print data. Agent Patent Attorney Takao Nishi lit Figure 5 Figure 2 1″3a

Claims (2)

[Claims] (1) When printing data on the front side of printing paper, an index mark corresponding to the data is printed along the leading edge of the paper, and when printing on the back side of the paper, the paper is turned 90 degrees and fed to the printer. The index mark is then read by a mark sensor mounted at a predetermined position on the lower surface of the reference edge side of the paper supply path of the printer, and the print data corresponding to the read signal is turned 90 degrees and printed. , a double-sided printing method for a printer of an information processing device. (2) A mark sensor is installed near the print head that performs printing processing while traveling in a direction perpendicular to the feeding direction of printing paper, and a mark sensor is installed at a fixed position on the lower surface of the reference edge side of the paper supply path. A printer for an information processing device, characterized in that when printing data based on a read signal from a mark sensor provided on the bottom surface, the output data received from the main unit is turned 90 degrees and printed.