JP2001080150A - Perfecting printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perfecting printer determining that which of first and second printing means is used in the printing of first or second printing data on the basis of the size of the printing area within a predetermined dimension from the front or rear end part of recording paper at a time of the printing of the first and second printing data on the recording paper to shorten the time required in double-side printing. SOLUTION: First printing data M has the first region A1 having a predetermined dimension (x) from the front end part 2a of recording paper 2 and the second region A2 having a dimension same to the predetermined dimension (x) from the rear end part 2b of the recording paper 2 and second printing data N has the third region B1 having a dimension same to the predetermined dimension (x) from the front end part 2a of the recording paper 2 and the fourth region B2 having a dimension same to the predetermined dimension (x) from the rear end part 2b of the recording paper 2 and the sizes of the printing areas of the first and third regions A1, B1 are compared by a printing area detection means and, when the printing area of the first region A1 is smaller than that of the third region B1, the first printing data M is printed precedingly by a first printing means 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer for duplex printing, and more particularly to a printer for duplex printing which can reduce the time required for duplex printing of recording paper.

In a conventional double-sided printing printer, a plurality of recording sheets 2 are stored in a sheet feeding tray 40 as shown in FIG. The paper 2 is elastically urged from the bottom of the paper feed tray 40 to the upper paper feed roller 42, and the uppermost recording paper 2 is pressed against the paper feed roller 42. By rotating the paper feed roller 42 in the clockwise direction, which is the direction of the arrow, the recording paper 2 in the paper feed tray 41 can be transported to the first printing unit 43 on the downstream side in the paper transport direction G. I have. The first printing means 43 is capable of printing on, for example, one surface of the recording paper 2, and a second printing means capable of printing on the other surface of the recording paper 2 is provided downstream of the first printing means 43. A printing means 46 is provided.

[0003] The first printing means 43 includes a paper feed roller 42.
A platen 44 in the form of a flat plate is disposed on the other surface side of the recording paper 2 sent by the above and shown in the lower part of the drawing. Thermal head 4 that can be moved toward and away from 44
5 is provided so as to be movable in the arrow H direction. This thermal head 45 has a plurality of dot-shaped heating elements,
The heating element is selectively heated based on printing information sent from a printing control unit (not shown). Further, a rotatable first paper feed roller 49 and a first pressure contact roller 50 are disposed in a pressure contact state on the downstream side of the first printing means 43 in the sheet transport direction.

The second printing means 46 disposed downstream of the first paper feed roller 49 in the paper transport direction G is provided on one side of the recording paper 2 sent by the first paper feed roller 49. A platen 47 is disposed on the upper side in the figure, and the thermal head of the first printing unit 43 that can be brought into contact with and separated from the platen 47 on the other surface side of the recording paper 2 on the lower side facing the platen 47 in the figure. A thermal head 48 having the same configuration as that of the thermal head 45 is provided so as to be movable in the arrow H direction. Further, a rotatable second paper feed roller 51 and a second pressure roller 52 are disposed in a pressure-contact state on the downstream side of the second printing means 46 in the paper transport direction. The second paper feed roller 5
1 is made of the same material and has the same shape as the first paper feed roller 49 of the first printing means 43.

A description will be given of a double-sided printing operation on paper 41 by such a conventional double-sided printing printer. Crimp. From this state, the paper feed roller 42 is rotated clockwise in the direction of the arrow to convey the recording paper 2 in the paper conveyance direction G. And recording paper 2
Is passed between the platen 44 of the first printing means 43 and the thermal head 45 in the separated state, and the front end of the recording paper 2 is pressed and held by the first paper feed roller 49 and the first pressing roller 50. . If the recording paper 2 is plain paper,
Thermal heads 45 of the first and second printing means 43 and 46,
An ink ribbon (not shown) is arranged between the recording paper 2 and the recording paper 2. Then, in the first printing unit 43, the thermal head 45 is moved to the platen 44 side and pressed against the platen 44, and based on the first print information sent from the print control unit (not shown), the thermal head 45 is moved. Of the recording paper 2 is selectively heated by the heat generating elements of FIG.
The desired image is printed by thermally transferring the ink.

At the same time as the printing operation on one side of the recording paper 2 by the first printing means 43, the paper feed roller 49 is rotated clockwise to convey the recording paper 2 printed on one side. To the second printing means 46 on the downstream side in the direction. Then, the leading end of the recording paper 2 having the image printed on one surface is pressed and held between the paper feed roller 51 and the pressing roller 52. In this state, in the second printing unit 46, the thermal head 48 is moved to the platen 47 side and pressed against the platen 47, and based on the second print information sent from the print control unit (not shown), Forty-eight heating elements are selectively heated, and the ink on the ink ribbon (not shown) is thermally transferred to the other surface of the recording paper 2 to print a desired image.

[0007] Such a conventional printer for double-sided printing,
First, for printing on both sides of one side and the other side of the recording paper 2,
It has second print information, and based on the first and second print information, first and second printing means 43, 4
6 for printing. Then, as shown in FIG. 9, for example, the first print information for printing on the side A which is one side of the recording paper 2 is, for example, the front end 2 of the recording paper 2
a has a first margin Y1 of a predetermined area from a, and the second print information for printing on the other surface B is a front end 2
a a second margin Y2 having a larger area than the first margin Y1 from a
Is configured.

[0008] Such a conventional printer for double-sided printing,
For example, the first printing information is printed by the first printing unit 43, and the second printing information is printed by the second printing unit 43.
By printing the print information by the second printing means 46, it was possible to simultaneously print images on both sides of the recording paper 2 and the printing efficiency was good.

[0009]

However, in the conventional printer as described above, the first print information having the first margin Y1 having a small area as shown in FIG. The printing order of the first and second printing information is fixed so that the second printing information having the second margin Y2 having a large area shown in FIG. 9B is printed by the second printing unit. For this purpose, the printing start line on the side B of the recording paper 2 on which the first printing information is being printed by the first printing means 43 is changed to the second printing means 4.
6 takes a long time to be sent to the thermal head 48, and there is a problem that the total time required for duplex printing on the A side and the B side becomes long.

That is, even if the area of the second margin Y2 is larger than the first margin Y1, the second print information is transmitted to the second printing means 46.
Takes the same time as printing the first print information by the first printing means 43, and the total time required for double-sided printing of the recording paper 2 becomes longer regardless of the size of the margin area. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and prints first and second print information within a predetermined dimension from a front end or a rear end of a recording sheet when printing the recording information on the recording sheet. Printer that can reduce the total time required for duplex printing by determining whether the first or second printing information is to be printed by the first or second printing means depending on the size of the printing area to be printed. The purpose is to provide.

[0011]

According to a first aspect of the present invention, there is provided a duplex printing printer comprising: a first printing unit capable of printing on one side of a recording sheet;
A second printing unit that is capable of printing on the other surface of the recording paper and is disposed downstream of the first printing unit in the transport direction of the recording paper, and prints on the one and the other surfaces of the recording paper, respectively. First and second print information for performing the first and second print information, wherein the first print information includes a first area having a predetermined size from a front end of the recording paper, and a second area having a predetermined size from a rear end of the recording paper.
And the second print information has a third area having a predetermined dimension from a front end of the recording paper, and a fourth area having a predetermined dimension from a rear end of the recording paper. In each of the second, third, third and fourth regions, the size of the printing area printed by the first and second printing information or the size of the margin area excluding the printing area is calculated. Calculating means for comparing the respective print areas or margin areas to calculate the first or second print information by either the first or second print means. It was configured to determine whether to print.

As a second solution for solving the above-mentioned problem, the calculation means compares the print area of the first and third regions or the size of the margin area and calculates the print area. The smaller one or the larger margin area is printed by the first printing unit.

As a third means for solving the above-mentioned problem, the calculation means compares the print area of the second and fourth areas or the size of the margin area, and calculates the print area. The larger one or the smaller margin area is printed by the first printing means.

According to a fourth aspect of the present invention, the printing area of the first area and the fourth area are added to form a first printing addition area, and the second area and the fourth area are added. Adding the three print areas to the second print addition area, and if the first print addition area is smaller than the second print addition area, printing the first print information by the first printing means; When the first print addition area is larger than the second print addition area, the second print information is printed by the first printing means.

As a fourth solution for solving the above-mentioned problem, a margin area of the first area and the fourth area is added to form a first margin addition area, and the second area and the fourth area are added to each other. The first print information is printed by the first printing means when the first blank addition area is larger than the second blank addition area by adding the three blank areas to the second blank addition area. When the first margin addition area is smaller than the second margin addition area, the second printing information is printed by the first printing means.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A printer for double-sided printing according to the present invention will be described below with reference to FIG. 1. First, a paper feed section 1 is provided on the lower side in the figure. The paper feeding unit 1 has a box-shaped paper feeding tray 3 capable of storing a plurality of large-sized recording papers 2 such as A4 size, for example. A movable plate 4 is provided so that the front side on the right side in the figure can turn up and down with the 4a as a fulcrum.

A portion of the recording paper 2 near the front end is placed on the movable plate 4. Further, an elastic member (not shown) is disposed on the right side of the movable plate 4 near the front in the figure, and an urging force for pushing up the movable plate 4 above the arrow D is applied to the movable plate 4 by the action of the elastic member. ing. Further, above the movable plate 4 near the front end, a paper feed roller 5 rotatable in a direction of an arrow F in a counterclockwise direction is provided. When the movable plate 4 is pivoted upward with the support 4a as a fulcrum, the paper feed roller 5 is brought into elastic contact with the front end of the recording sheet 2 on the movable plate 4.

In order to convey the recording paper 2 stored in such a paper supply section 1 in the paper conveyance direction E, when the paper supply roller 5 is rotated in the direction of arrow F, the uppermost recording paper 2 is rotated. The recording paper 2 is separated from the lower recording paper 2, discharged from the paper feed tray 3, and transported downstream in the paper transport direction E. On the downstream side of the recording paper 2 conveyed from the paper supply unit 1 in the paper conveyance direction E, a plate for guiding the recording paper 2 sent thereto to first and second printing means 7 and 17 described later. Guide plate 6
Are arranged. The guide plate 6 is formed to be curved as shown in FIG. 1 and turns the recording paper 2 sent from the paper feeding unit 1 upward in the drawing in a substantially right-angle direction, and is disposed downstream of the guide plate 6. The first printing unit 7 provided is guided. The first printing means 7 includes the recording paper 2
A desired image can be printed on one side, for example, the front side.

The first printing means 7 is provided with a flat first platen 8 made of rubber or the like on the right side of the recording sheet 2 turned upward by a guide plate 6 shown in FIG. ing. This first platen 8 is, as shown in FIG.
The printing surface 8a is disposed so as to be substantially vertical. Below the first platen 8, a first paper feed roller 9 capable of conveying the recording paper 2 conveyed from the paper supply unit 1 between the first platen 8 and a first thermal head 14 described later.
Are arranged.

The first paper feed roller 9 has a long rotating shaft 9a that can rotate, and is formed on the rotating shaft 9a with a plurality of rubbers or the like to have a columnar predetermined diameter. One paper feed roller 9 is integrally mounted. Further, the first paper feed roller 9 is provided with a first pressure roller 10 which is pressed against a predetermined pressure and is rotatable following the rotation of the first paper feed roller 9. The first pressure roller 10 is rotatably held by a roller holding member (not shown), and is independently elastically urged by the first paper feed roller 9 to be pressed. Then, the first paper feed roller 9 is rotated so that the recording paper 2 conveyed from the paper feed unit 1 has a predetermined holding force between the first paper feed roller 9 and the first pressing roller 10. The recording paper 2 can be conveyed to the first platen 8 downstream of the first paper feed roller 9 in the paper conveyance direction E.

A first carriage 11 is provided on a side facing the first platen 8.
Are supported by a rod-shaped guide shaft 12. The first carriage 11 is attached to an appropriate drive belt 13 stretched over a pair of pulleys (not shown), and drives the drive belt 13 by a drive means (not shown) such as a stepping motor to form a guide shaft. 12 is reciprocally movable. Also, the first carriage 11 has
A first thermal head 14 that can be moved toward and away from the first platen 8 is mounted at a position facing the first platen 8. The first thermal head 14 has a plurality of dot-shaped heating elements (not shown), and based on the first or second print information sent from a print control unit (not shown). A desired image is printed by selectively causing the heat generating element to generate heat, and thermally transferring ink on an ink ribbon 16 described later to one surface of the recording paper 2.

A pair of rotatable bobbins 11b, 11b, which are spaced apart from each other by a predetermined distance, are formed on the upper surface of the first carriage 11 near the center of the cassette mounting surface 11a. The ribbon cassette 15 is detachable from the cassette mounting surface 11a of the first carriage 11. The ribbon cassette 15 has a pair of hole-shaped reels 15 with which the pair of bobbins 11b can be engaged.
a, 15a, around which a pair of reels 15a, 15a are wound with an ink ribbon 16 coated with a predetermined color of heat-meltable ink. Such a first printing unit 7
The first platen 8 and the first platen 8
The ends of the paper feed roller 9, the guide shaft 12, and the like are attached and integrated.

Further, on the downstream side of the first printing means 7 in the paper transport direction E shown in FIG.
For example, a second printing unit 1 capable of printing a desired image on the back side
7 are provided. The second printing means 17 has the same components as the first printing means 7 shown in FIG. The second printing unit 17 includes, as shown in FIG.
A second platen 18 is disposed on the left side of the recording sheet 2 conveyed from the printer, and a second thermal head 19 that can be moved toward and away from the second platen 18 is provided on a side facing the second platen 18. It is attached to a second carriage (not shown) that can reciprocate along the second platen 18.

Further, below the second platen 18 in the drawing,
A rotatable second paper feed roller 20 made of rubber or the like capable of conveying the recording paper 2 conveyed from the first printing means 7 to the second platen 18 is provided. A second pressing roller 21 that is pressed at a predetermined pressure and is rotatable following the rotation of the second paper feed roller 20.
Are arranged.

Then, by rotating the second paper feed roller 20, the recording paper 2 conveyed from the first printing means 7 is pressed and held between the second paper feed roller 20 and the second pressure roller 21. Thus, the recording paper 2 can be discharged to the outside of the second printing means 26 on the downstream side in the paper transport direction E.

The second printing means 17 is provided with a second carriage (not shown).
The ribbon cassette 15 described in the printing means 7 is detachable. Similarly to the first thermal head 14, the second thermal head 19 has a plurality of dot-shaped heating elements formed thereon, and the first or second print information sent from a print control unit (not shown). By selectively causing the heating elements to generate heat based on the above, the ink of the ink ribbon 16 can be thermally transferred to the other surface of the recording paper 2 to print a desired image.

The operation of the double-sided printing printer according to the present invention will be described with reference to FIG.
By rotating the paper feed roller 5 in the direction of arrow F from the state where the recording paper 2 is pressed against the paper feed roller 5 by the action of the internal movable plate 4, the uppermost recording paper stored in the paper feed unit 1 is rotated. 2
Is transported downstream in the paper transport direction E. Next, the recording paper 2 sent from the paper supply unit 1 is guided by the guide plate 6 and is conveyed to the first printing unit 7 on the downstream side of the guide plate 6. Then, the leading end of the recording paper 2 is pressed and held between the rotating first paper feed roller 9 and the pressing roller 10, and the first paper feed roller 9 and the pressing roller 10 are pressed.
The paper is conveyed downstream of the paper feed roller 9 between the first platen 8 and the first thermal head 14 in a head-up state.

By controlling the amount of rotation of the first paper feed roller 9 by a drive control unit (not shown), the printing start position on one side of the recording paper 2 can be determined by the first thermal head 1.
The rotation of the first paper feed roller 9 is stopped at the heating element No. 4. Next, the first thermal head 14 is moved down, and the recording paper 2 and the ink ribbon 16 are interposed.
The first or second thermal head 14 is pressed against the first platen 8 to print on one surface of the recording paper 2.
Based on the print information, the heating elements of the first thermal head 14 are selectively heated, and the first carriage 11 is moved along the first platen 8 to move one line or one line on one surface of the recording paper 2. The operation of thermally transferring the ink of the ink ribbon 16 simultaneously with a plurality of lines and the line feed operation by the first thermal head 14 with the first thermal head 14 raised and repeated by the first paper feed roller 9 are repeated so that the first or The image based on the second print information is printed.

The recording paper 2 being printed by the first printing means 7 is moved to the second printing means 17 on the downstream side of the first printing means 7 in the paper transport direction E by the line feed operation of the first paper feeding roller 9. Conveyed. Then, the leading end of the recording paper 2 being printed on one side by the first printing means 7 is
The recording paper 2 is pressed and held between the paper feed roller 20 and the second pressure roller 21, and the rotation of the second paper feed roller 20 causes the recording paper 2 to come into contact with the second platen 18 on the downstream side in the paper transport direction E and the second thermal platen in the head-up state It is transported between the head 19.

Next, the second thermal head 19 is lowered, and the second thermal head 19 is pressed against the second platen 18 via the recording paper 2 and the ink ribbon 16 to print on the other surface of the recording paper 2. First or second to
The heating element of the second thermal head 19 is selectively heated based on the print information. Then, while moving a second carriage (not shown) along the second platen 18, one line or a plurality of lines of the ink of the ink ribbon 16 are thermally transferred to the other surface of the recording paper 2 simultaneously, and 2 The thermal head 19 is raised and the second paper feed roller 2
The line feed operation is performed by rotating 0, and the image of the first or second print information is printed on the other surface of the recording paper 2 so that the desired image is printed on one and the other surfaces of the recording paper 2. Can be printed.

In such a printer for duplex printing according to the present invention, the first and second print information are stored in the first and second printing means 7,
17 will be described with reference to FIG. 4. The first print information M includes, for example, image data for printing on one side (A side) of the recording paper 2 in which the image data is recorded. The recording sheet 2 has a first area A1 having a predetermined dimension x from the front end 2a thereof, and a rear area 2b having a second area A2 having the same dimension as the predetermined dimension x.

The second print information N includes, for example, image data for printing on the other surface (surface B) of the recording paper 2, from the front end 2 a of the recording paper 2 to a predetermined size x of the first area A 1. And a fourth area A4 having the same size as the predetermined size x from the rear end 2b of the recording paper 2. Further, the duplex printer according to the present invention includes first, second, third, and fourth areas A1, A2, A3, A4.
Calculation means (not shown) for calculating the size of the print area printed by the first and second print information M and N, or the size of the margin area excluding the print area. ing.

The calculation means compares the size of the printing area or the margin area of the first, second, third, and fourth areas A1, A2, A3, A4, and determines the first or second area. 2
The print information M, N is stored in the first or second printing unit 7, 17
Is determined, and the first and second print information M and N can be appropriately laid out and printed on the A and B sides of the recording paper 2.

Then, according to the present invention, as shown in the flow chart of FIG. 3, first and third areas A1 and B1 are calculated by a calculating means (not shown).
Compare the size of the print area of No. 1 and, for example, as shown in FIG. 4, when the print area of the first area A1 is smaller than the third area B1, there is a first area A1 of a smaller print area. The first printing information M is printed first by the first printing means 7. Alternatively, the first area A1 has a margin area of the third area B1.
If larger, the first area A1 with the larger margin area
Is printed first by the first printing means 7. Thus, when the printing area is smaller in the first area A1 than in the third area B1, or when the margin area is smaller than the first area A1.
Is larger than the third area B1, the first print information M
Is first printed on the recording paper 2 by the first printing unit 7,
The time required for printing the first area A1 having a small printing area can be shortened, and the front end 2a of the recording paper 2 can be quickly and quickly conveyed to the second printing means 17 on the downstream side. Therefore, the total printing time required for double-sided printing of the recording paper 2 can be reduced.

Although not shown, the printing area is the first area.
If the area A1 is larger than the third area B1, or if the margin area is smaller than the third area B1 in the first area A1, the second print information N is first sent to the recording paper 2 by the first printing means 7. May be printed. That is, the calculation means compares the print area of the first and third areas A1 and B1 having the same area, and the size of the margin area excluding the print area, and determines the smaller print area,
Alternatively, the one with the larger margin area is printed by the first printing unit 7.

The print area of the second area A2 and the print area of the fourth area B2 shown in FIG. 5, or the size of the margin area excluding the print area is compared by the calculation means. If the fourth area B2 is larger, the second print information N having the fourth area B2 with a larger print area may be printed first by the first printing unit 7. Alternatively, if the margin area is smaller in the second area A2 than in the fourth area B2, the first print information M shown in FIG. Print first. Alternatively, although not shown, if the fourth area B2 has a smaller print area than the second area A2, or if the fourth area B2 has a larger margin area than the second area A2, the second area is used. The first printing information M in which the printing area of the area A2 is large or the margin area of the second area A2 is small may be printed by the first printing means 7 first.

That is, the calculation means calculates the second and fourth areas A
2. The print area of B2 and the size of the margin area excluding the crotch print area are compared, and the larger print area or the smaller margin area is printed by the first printing means 7. The size of the printing area or the margin area of the second and fourth regions A2 and B2 is compared, and the larger printing area or the smaller margin area is printed first by the first printing unit 7. Since printing by the second printing means 17 has a smaller printing area from the rear end of the recording paper, printing time by the second printing means 17 can be reduced, and the total printing required for double-sided printing can be reduced. You can save time.

In the method described above, for example, the first and second print information M and N are such that the print area of the first and third areas A1 and B1 as shown in FIG. And the printing area of the second and fourth areas A2 and B2 is
If the area A2 is smaller, it cannot be determined which of the first and second print information M and N should be printed first by the first printing means. In order to solve such a problem, in the present invention, as shown in FIG. 6, for example, the print areas of the first area A1 and the fourth area B2 are added to form a first print addition area, and the second area A2 The print area of the third area B1 is added to obtain a second print additional area. If the first print additional area is smaller than the second print additional area, the first print information M shown in FIG. Print first, as shown in FIG.
If the print addition area is larger than the second print addition area, the first print means 7 may print the second print information N shown in FIG.

The margin areas of the first area A1 and the fourth area B2 are added to form a first margin addition area, and the margin areas of the second area A2 and the third area B1 are added to form a second margin addition area. When the first margin addition area is larger than the second margin addition area, the first print information M shown in FIG. 6 is printed by the first printing means 7, and as shown in FIG. If the area is smaller than the second margin addition area, the first print unit 7 may print the second print information N shown in FIG.

The first print information M when the first print addition area is smaller than the second print addition area is first printed by the first printing means 7 so as to correspond to the print area of the first area A1. The time required for printing the first area A1 can be shortened, the recording paper 2 can be quickly conveyed to the second printing means 17 on the downstream side in a short time, or the printing area corresponding to the size of the printing area of the fourth area B2 can be accommodated. Thus, the time for printing the second print information N by the second printing unit 17 can be reduced. Therefore, it is possible to reduce the time required for duplex printing on the A and B sides of the recording paper 2.

[0041]

As described above, the double-sided printing printer according to the present invention uses the first and second print information in the first, second, third, third and fourth areas, respectively. A print area to be printed, or calculating means for calculating a margin area size excluding the print area, the calculation means compares the respective print area, or the size of the margin area, the first, Alternatively, since it is determined whether to print the second print information by the first or second printing unit, it is possible to provide a printer for double-sided printing capable of reducing the printing time required for double-sided printing.

Further, the first and third data are calculated by the calculation means.
The print area of the region or the size of the margin area is compared, and the smaller print area or the larger margin area is printed by the first printing means. The smaller printing area can be printed in a short time, and the recording paper can be quickly conveyed to the downstream second printing means in a short time. Therefore, the total printing time required for double-sided printing can be reduced.

Further, the print area detecting means compares the print area of the second and fourth regions, the crotch h and the size of the margin area, and determines whether the print area is larger or smaller. Since the printing is performed by the first printing unit, the smaller printing area is printed by the second printing unit, and the printing time of the second printing unit that prints after the first printing unit is reduced. And the total printing time required for double-sided printing can be reduced.

When the first print addition area is smaller than the second print addition area, the first print information is printed by the first printing means, and when the first print addition area is larger than the second print addition area. Since the second printing information is printed by the first printing means, it is possible to provide a double-sided printing printer capable of reducing the total printing time required for double-sided printing.

When the first margin addition area is larger than the second print addition area, the first print information is printed by the first printing means, and when the first margin addition area is smaller than the second margin addition area. Since the second printing information is printed by the first printing means, it is possible to provide a double-sided printing printer capable of reducing the total printing time required for double-sided printing.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic structure of a printer for duplex printing of the present invention.

FIG. 2 is a schematic perspective view of a first printing unit according to the present invention.

FIG. 3 is a diagram showing a flow for comparing print areas according to the present invention.

FIG. 4 is an image diagram when printing first and second print information according to the present invention.

FIG. 5 is an image diagram when printing first and second print information according to the present invention.

FIG. 6 is an image diagram when printing first and second print information according to the present invention.

FIG. 7 is an image diagram when printing first and second print information according to the present invention.

FIG. 8 is a diagram illustrating a schematic structure of a conventional duplex printer.

FIG. 9 is an image diagram when printing information of a conventional duplex printer is printed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper feed part 2 Recording paper 3 Paper feed tray 4 Movable plate 4a Support part 5 Paper feed roller 6 Guide plate 7 1st printing means 8 1st platen 8a Printing surface 9 1st paper feed roller 10 1st pressure contact roller 11 Love 1 Carriage 11a Cassette mounting surface 11b Bobbin 14 First thermal head 15 Ribbon cassette 17 Second printing means 18 Second platen 19 Second thermal head 20 Second paper feed roller 21 Second pressing roller A1 First area A2 Second area B1 First 3 area B2 4th area

Claims (5)

[Claims] 1. A first printing device capable of printing on one surface of a recording sheet, and a first printing device being printable on the other surface of the recording sheet and disposed downstream of the first printing device in a conveying direction of the recording sheet. Second printing means, and first and second printing information for printing on both the one and the other sides of the recording sheet, respectively, wherein the first printing information is a predetermined number from a front end of the recording sheet. A first area having a predetermined size and a second area having a predetermined size from a rear end of the recording sheet; the second print information includes a third area having a predetermined size from a front end of the recording sheet; A fourth region having a predetermined dimension from a rear end of the sheet, and printed in the first, second, third, third, and fourth regions by the first and second print information, respectively; A calculation method for calculating the size of the printing area or the size of the margin area excluding the printing area The printing means or the margin area is compared by the calculating means, and the first or second printing information is printed by either the first or second printing means. A printer for duplex printing, characterized in that the printer is designed to determine whether or not the printer is in use. 2. The calculation means compares the size of the printing area or the margin area of the first and third regions, and determines the smaller of the printing area or the larger of the margin area in the first area. 2. The double-sided printing printer according to claim 1, wherein printing is performed by one printing unit. 3. The method according to claim 1, wherein the calculating unit compares the print area of the second and fourth regions or the size of the margin area, and determines a larger one of the print area or a smaller one of the margin areas. 2. The printer according to claim 1, wherein the printing is performed by a printing unit. 4. A second print addition by adding the print areas of the first area and the fourth area to obtain a first print addition area, and adding the print areas of the second area and the third area to each other. If the first print addition area is smaller than the second print addition area, the first print information is printed by the first printing means, and the first print addition area is larger than the second print addition area. 2. The printing method according to claim 1, wherein the second printing information is printed by the first printing unit when the size is larger.
A printer for double-sided printing as described. 5. A method for adding a margin area of the first area and the fourth area to form a first margin addition area, and adding a margin area of the second area and the third area to add a second margin area. When the first margin addition area is larger than the second margin addition area, the first print information is printed by the first printing unit, and the first margin addition area is larger than the second margin addition area. 2. The printing apparatus according to claim 1, wherein the second printing information is printed by the first printing unit when the printing information is small.
A printer for double-sided printing as described.