JPH09100072A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a job for backside printing easily and accurately as a turnover motion of paper can be done in a simple structure without conveying the paper in reverse. SOLUTION: This printer is provided with such a memory as storing at least one page portion of printing information among much of the printing information, and also a paper discharge roller 15 discharging a sheet of paper 5 to a paper inserting part 14 is installed there, while the paper 5 discharged by this paper discharge roller 15 is reconveyed, and it is further provided with a control means controlling a paper feed roller 3 and a printing head 2 on the basis of the printing information so as to print the back-side of the paper 5 by the printing head 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer, and more particularly to a printer for performing desired printing on both sides of paper.

[0002]

2. Description of the Related Art Conventionally, in a printing apparatus for performing desired printing on a sheet by driving a print head based on a desired printing signal, when performing double-sided printing, first, a desired sheet is printed on the surface of the sheet. After printing based on the print information of, the paper after the front side printing is ejected once outside the device, and the user of the device reverses the paper after the front side printing and inserts it into the recording device. I was trying to print.

However, such a double-sided printing means has a problem that it is extremely inconvenient and inconvenient to handle because it requires a user to always turn over the paper.

Therefore, conventionally, there is provided a printing apparatus which automatically reverse-prints a sheet printed on the front side and reversely conveys the sheet, and performs back-side printing on the reverse-conveyed sheet to automatically perform double-sided printing. Being developed.

FIG. 6 shows such a conventional printing apparatus, in which a flat platen 1 is disposed so as to extend in the lateral direction, and a drive not shown is provided in front of the platen 1. A print head 2 is provided which can be moved toward and away from the platen 1 by a mechanism. Platen 1
A cylindrical paper feed roller 3 is rotatably driven below the paper feed roller 3, and below the paper feed roller 3 are two small rollers 4 pressed against the peripheral surface of the paper feed roller 3. ，
4 are arranged so as to have a predetermined interval in the paper transport direction. A paper detection switch 6 that detects the position of the leading edge of a predetermined paper 5 is provided between each of the small rollers 4.

Further, a paper feeding device 7 such as a paper feeding cassette for accommodating a plurality of papers 5 is disposed behind the paper feeding roller 3, and the front end of the paper feeding device 7 is provided with this paper feeding device 7. A paper feed roller 8 that separates the paper 5 stored in the paper feed device 7 one by one from the uppermost paper 5 and conveys it between the paper feed roller 3 and the small roller 4 is rotatably arranged. There is.

Above the platen 1, a first paper discharge cassette 9 extending rearward and a second paper ejecting cassette 9 extending forward are provided.
A paper discharge cassette 10 is provided, and a partition plate 11 is provided between the paper discharge cassettes 9 and 10. A first paper discharge roller 12 is rotatably arranged on the partition plate 11 on the side of the first paper discharge cassette 9, and a first paper discharge roller 12 is arranged on the side of the second paper discharge cassette 10 on the partition plate 11. The two paper discharge rollers 13 are rotatably driven.

In such a conventional printing apparatus, when desired double-sided printing is performed, the paper feed roller 8 is rotationally driven to separate the paper 5 of the paper feed device 7 from the uppermost paper 5 one by one. Then, it is conveyed between the paper feed roller 3 and the small roller 4, and is conveyed between the platen 1 and the print head 2 by the paper feed roller 3.

Subsequently, the print head 2 is operated based on predetermined print information, and the carriage is moved to perform desired printing on the paper 5. Then, as the printing progresses while the paper 5 is being fed, the leading end of the paper 5 is moved to the first position by the first paper discharge roller 12.
It is sent to the paper ejection cassette 9 side.

Thereafter, when printing is completed, the printed sheet 5 is conveyed upward by the first sheet ejection roller 12 and the printing surface of the sheet 5 is located on the upper surface of the first sheet ejection cassette 9. And the printing on the front side is completed.

Then, when printing on the back side, first,
The first paper discharge roller 12 is rotationally driven in the opposite direction, and the second paper discharge roller 13 is rotationally driven to print the paper 5 after printing.
Is conveyed to the upper surface of the second paper discharge cassette 10. Then, the second discharge roller 13 is driven to rotate in the opposite direction, and
By rotating the paper feed roller 3 in the opposite direction,
The printed sheet 5 conveyed to the second sheet discharge cassette 10 is conveyed in the opposite direction between the platen 1 and the print head 2, and is conveyed backward until the rear end of the sheet 5 passes the sheet detection switch 6. The paper feed roller 3 and the second paper discharge roller 13 are stopped, and the conveyance of the paper 5 is stopped.

After that, the paper feed roller 3 is rotationally driven in the forward direction to convey the paper 5 after the front surface printing, and when the paper detection switch 6 detects the leading end of the paper 5 and is turned on, from this position, The paper feed roller 3 is driven to rotate by a predetermined amount, the paper 5 is conveyed between the platen 1 and the print head 2, and the back surface is printed. And the paper 5 after printing
Is ejected to the first paper ejection cassette 9 by the first paper ejection roller 12, whereby double-sided printing is completed.

[0013]

However, in such a conventional printing apparatus, it is necessary to provide two paper discharge cassettes in order to reverse the paper 5 after the front surface printing,
Moreover, since it is necessary to drive and control the paper feed roller 3 and the respective paper discharge rollers 12 and 13 so as to rotate in the forward and reverse directions, the transport mechanism for the paper 5 becomes extremely complicated, and the control of this transport mechanism also becomes complicated. I have a problem. Also,
Since it is necessary to convey the paper 5 in reverse when printing on the back side, there is a problem in that the tip of the paper 5 is caught by the print head 2 or the like during the reverse conveyance, and stable paper feeding cannot be performed. There is.

The present invention has been made in view of the above-mentioned points, and it is possible to reverse the paper with a simple structure without carrying the paper backward, and to perform the back surface printing easily and surely. An object of the present invention is to provide a printing device capable of performing the above.

[0015]

In order to achieve the above object, a printer according to a first aspect of the present invention is provided with a paper inserting portion for inserting a predetermined paper and is inserted from the paper inserting portion. A printing apparatus, which is provided with a paper transporting mechanism for transporting a printed sheet to a print head portion, and operates the print head based on predetermined print information to perform desired printing on the print sheet. Storage means for storing print information for at least one page is provided, and a paper discharge mechanism for discharging the printed paper to the paper insertion portion is provided, and the paper discharged by this paper discharge mechanism is conveyed again. Further, a control means for controlling the paper transport mechanism and the print head based on the print information is provided so that the print head prints on the back surface of the paper.

Further, according to the invention as defined in claim 2, a paper feeding device for accommodating a plurality of predetermined papers and separating and feeding the papers one by one is provided, and the paper is fed by the paper feeding device. A printing apparatus for arranging a paper transport mechanism for transporting the formed paper to a print head portion, and operating the print head based on predetermined print information to perform desired printing on the paper. A storage means for storing print information for at least one page is provided, a paper insertion portion for inserting a predetermined paper into the paper transport mechanism portion is provided, and the paper after printing is discharged to the paper insertion portion. A first paper discharging mechanism is provided, the paper discharged by the first paper discharging mechanism is conveyed again, and printing is performed on the back surface of the paper by the print head based on the print information. The paper transport mechanism and the printing Disposed control means for controlling the de, is characterized in that it has provided the second sheet discharge mechanism for discharging the paper after the backside printing.

Further, in the invention described in claim 3, when the back side printing is performed on the paper after the front side printing, the control means reads the print information for one page stored in the storage means from the end. It is characterized in that the print head is controlled.

According to a fourth aspect of the present invention, the control means reads the print information for one page stored in the storage means from the beginning to perform print control, and reads it from the end to perform print control. It is characterized in that the process and the process are alternately performed for each printed page.

According to the printing apparatus of the present invention, the paper after the front surface printing is ejected to the paper insertion portion by the paper ejection mechanism to reverse the paper, and the paper after the front surface printing is printed by the paper conveyance mechanism. The print information for one page stored in the memory means is read from the end by the control means and the print head is controlled to perform the back surface printing. Therefore, the back surface printing can be appropriately performed. It is possible to perform double-sided printing easily and surely.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows a first embodiment of the printing apparatus according to the present invention, in which a platen platen 1 is arranged so as to extend in the lateral direction, and in front of the platen 1. Is provided with a print head 2 which can be moved into and out of contact with the platen 1 by a drive mechanism (not shown). Below the platen 1, a cylindrical paper feed roller 3 as a paper transport mechanism is rotatably driven.
Below the paper feed roller 3, two small rollers 4 which are pressed against the peripheral surface of the paper feed roller 3 are arranged so as to have a predetermined interval in the paper transport direction. A paper inserting portion 14 is disposed behind the paper feeding roller 3, and a predetermined paper 5 placed in the paper inserting portion 14 is placed between the paper feeding roller 3 and the small roller 4 one by one. It is designed to be supplied to. Furthermore, above the platen 1,
A paper discharge roller 15 is disposed as a paper discharge mechanism for conveying the printed paper 5 upward, and the printed paper 5 is directed toward the paper insertion portion 14 in front of the paper discharge roller 15. A paper discharge guide 16 is provided for guiding.

FIG. 2 shows an embodiment of a control device for a printing apparatus according to the present invention. The CPU 17 as a control means for performing predetermined printing control includes a print head for driving and controlling the print head 2. Drive circuit 18, carriage motor drive circuit 19 for controlling movement of the carriage on which print head 2 is mounted, paper feed roller 3, and paper discharge roller 15
A paper feed motor drive circuit 20 for controlling the drive of each of them is connected. Further, the CPU 17 is connected with a memory 21 as a storage means for storing predetermined print information. In the present embodiment, this memory 21 is connected.
Is a storage capacity capable of storing print information for one page. Further, the CPU 17 is connected to a print selection unit 22 for selecting either double-sided printing or single-sided printing.

Next, the operation of the present embodiment will be described.

First, when desired double-sided printing is performed, a predetermined paper 5 is placed on the upper surface of the paper insertion portion 14, and in this state, the CPU 17 outputs an operation signal to the paper feed motor drive circuit 20 to feed the paper. By driving the roller 3, the paper 5 set in the paper insertion portion 14 is taken out, sandwiched between the paper feed roller 3 and the small roller 4, and conveyed between the platen 1 and the print head 2.

Then, based on the predetermined print information, the CPU
By outputting an operation signal from 17 to the print head drive circuit 18 to operate the print head 2 and outputting an operation signal to the carriage motor drive circuit 19 to move the carriage, as shown in FIG. , The paper 5
The desired printing is performed on. When printing of one line is completed, the CPU 17 outputs an operation signal to the paper feed motor drive circuit 20 to drive the paper feed roller 3 to feed the paper 5 by one line, and the print head 2 and the print head 2 Drive the carriage to print the next line. By repeating the above operation, printing proceeds, and when the leading end of the sheet 5 is positioned at the sheet discharge roller 15, the sheet 5 is conveyed upward by the sheet feed roller 3 and the sheet discharge roller 15, and the sheet 5 is conveyed. The sheet guide 5 is guided toward the sheet insertion portion 14 by the sheet ejection guide 16. After that, when printing is completed, the paper 5 after printing is sent to the upper surface of the paper insertion portion 14 by the paper ejection guide 16 while being conveyed upward by the paper ejection roller 15, and the printing on the front surface is completed. At this time, the printed surface of the paper 5 after the front surface printing is located on the upper surface, and the rear end of the paper 5 is located on the paper feed roller 3 side.

Subsequently, when printing on the back side, the CPU
By outputting an operation signal from 17 to the paper feed motor drive circuit 20 to drive the paper feed roller 3, the paper 5 after front surface printing installed in the paper insertion portion 14 is taken out, and the platen 1 and the print head 2 are connected. Transport between. In this case,
Since the printing surface of the paper 5 is located on the upper surface and the rear end of the paper 5 is located on the paper feeding roller 3 side, the paper feeding roller 3 is driven by driving the paper feeding roller 3. The paper 5 after the front surface printing is conveyed from the rear end thereof. Therefore, when performing the back surface printing, the printing is started from the rear end of the paper 5.

Therefore, in the present embodiment, the print information for one page is stored in the memory 21, and the print information to be printed on the rear end side of the paper 5 among the print information stored in the memory 21, that is, Of the print information for one page, the final print information is read out, and based on this print information, FIG.
As shown in (b), printing is performed from the rear end side of the paper 5.

Then, similarly to the printing operation, printing is sequentially performed from the rear end side of the paper 5, and when the printing is completed, the paper is delivered to the paper insertion portion 14 by the paper ejection roller 15, whereby double-sided printing is completed. .

Therefore, in this embodiment, the paper 5 after the front surface printing is ejected by the paper ejection guide 16 into the paper insertion section 14
Since the sheet 5 is reversed by conveying the sheet 5 to the sheet, it is not necessary to reversely convey the sheet 5 as in the conventional case. Therefore, the conveying mechanism of the sheet 5 is simple, control is easy, and the reverse sheet conveying It is possible to reliably prevent the sheet 5 from being caught, and to perform stable sheet feeding. When printing on the back side, the printing is started from the rear end of the paper 5. However, one page of print information is stored in the memory 21, and the print information stored in the memory 21 is stored. Since the final print information is read out and the print is performed from the rear end side of the paper 5 based on this print information, the back surface can be properly printed, and the double-sided printing can be performed easily and surely. Can be done.

FIG. 4 shows a second embodiment of the printing device according to the present invention.
In the present embodiment, a sheet feeding device 7 such as a sheet feeding cassette for storing a plurality of sheets 5 is disposed behind the sheet feeding roller 3 and At the tip of the device 7, the paper 5 stored in the paper feeding device 7
Is separated from the uppermost paper 5 one by one and the paper feed roller 3
A sheet feeding roller 8 that conveys the sheet between the small roller 4 and the small roller 4 is rotatably driven. Further, above the paper feeding device 7, a paper insertion portion 14 for feeding predetermined papers 5 one by one.
Is provided, and the front end of the paper insertion portion 14 has
A paper feed roller 23 for supplying the predetermined paper 5 placed in the paper insertion portion 14 one by one between the paper feed roller 3 and the small roller 4 is arranged.

Further, above the platen 1, a paper discharge guide 24 having a substantially inverted triangular shape is disposed so as to be swingably driven left and right in the drawing around a rotation shaft 25 as a center.
On the front side of the paper discharge guide 24, a paper discharge cassette 26 for discharging the printed paper 5 is arranged. Near the front and rear sides of the paper ejection guide 24, a return paper ejection roller 27 for ejecting the printed paper 5 toward the paper insertion portion 14 and a paper 5 after printing are ejected to the paper ejection cassette 26 side. Discharge rollers 28 are provided respectively.

FIG. 5 shows an embodiment of a control device for a printing apparatus according to the present invention. In this embodiment, the CPU 17 for performing predetermined printing control includes a print head drive circuit 18 and a carriage. In addition to the motor drive circuit 19, the paper feed motor drive circuit 20, and the memory 21, a paper ejection guide drive circuit 29 for swinging the paper ejection guide 24 is connected.

Since the other parts are the same as those in the above-mentioned embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation of this embodiment will be described.

In the present embodiment, when desired double-sided printing is performed, double-sided printing is selected by the print selection unit 22,
This selection signal is sent to the CPU 17.

First, in the case of front surface printing, in this case, an operation signal is output from the CPU 17 to the paper ejection guide drive circuit 29 to swing the paper ejection guide 24 counterclockwise in the figure. .

When the paper 5 is manually fed, the predetermined paper 5 is placed on the upper surface of the paper insertion portion 14,
In this state, the CPU 17 drives the paper feed motor drive circuit 20.
An operation signal is output to drive the paper feed roller 23 to rotate, and the paper feed roller 3 is driven to take out the paper 5 set in the paper insertion portion 14, and the paper feed roller 3 and the small roller 4 are ejected. It is sandwiched between these and conveyed between the platen 1 and the print head 2. On the other hand, from the paper feeding device 7 to the paper 5
When feeding paper, the paper feed roller 8 is driven to rotate so that the paper 5 of the paper feed device 7 is separated one by one from the uppermost paper 5 and conveyed between the paper feed roller 3 and the small roller 4. Then, the platen 1 and the print head 2 are moved by the paper feed roller 3.
It is designed to be transported between and.

Subsequently, based on the predetermined print information, the CPU
17 outputs an operation signal to the print head drive circuit 18 to operate the print head 2 and outputs an operation signal to the carriage motor drive circuit 19 to move the carriage, thereby performing desired printing on the paper 5. Is to do. Then, as the printing progresses while feeding the paper 5, the leading end of the paper 5 will be located at the paper ejection guide 24 portion.
Is swung counterclockwise, the leading end of the paper 5 after printing is guided between the paper discharge guide 24 and the return paper discharge roller 27.

Thereafter, when printing is completed, the paper 5 after printing is sent to the upper surface of the paper insertion portion 14 by the paper ejection guide 24 while being conveyed upward by the return paper ejection roller 27, and the printing on the front surface is completed. . At this time, as for the paper 5 after the front surface printing, the print surface is located on the upper surface and
The trailing edge is located on the paper feed roller 3 side.

Then, when printing on the back side, the CPU
An operation signal is output from 17 to the discharge guide drive circuit 29 to swing the discharge guide 24 clockwise in the drawing.

Then, the CPU 17 outputs an operation signal to the paper feed motor drive circuit 20 to drive the paper feed roller 3 to take out the paper 5 after the front surface printing set in the paper insertion section 14 and to platen the platen 1. And the print head 2. In this case, the paper 5 after the front surface printing
Since the sheet is conveyed from the rear end as in the above embodiment, the print information to be printed on the rear end side of the sheet 5 of the print information for one page stored in the memory 21, that is, the final print. The information is taken out from the information, and printing is performed from the rear end side of the paper 5 based on this printing information.

Similar to the printing operation, printing is sequentially performed from the rear end side of the paper 5, and at this time, since the paper discharge guide 24 is swung in the clockwise direction, the paper 5 after printing is printed. The leading end of the paper is a paper ejection guide 24 and a paper ejection roller 28.
The sheet 5 after the printing is guided between the sheet ejection rollers 2
Then, the sheet is sent to the paper discharge cassette 26 by 8, and double-sided printing is completed.

When performing one-sided printing, the print selection section 22 selects one-sided printing, and the selection signal is sent to the CPU.
Then, the CPU 17 outputs an operation signal to the paper ejection guide drive circuit 29 to swing the paper ejection guide 24 clockwise in the drawing.

Then, the CPU 17 outputs an operation signal to the paper feed motor drive circuit 20 to drive the paper feed roller 3 so that the paper 5 installed in the paper insertion portion 14 is ejected.
Alternatively, one of the sheets 5 of the sheet feeding device 7 is taken out, nipped between the sheet feeding roller 3 and the small roller 4, and conveyed between the platen 1 and the print head 2.

Then, based on the predetermined print information, the CPU
17 outputs an operation signal to the print head drive circuit 18 to operate the print head 2 and outputs an operation signal to the carriage motor drive circuit 19 to move the carriage, thereby performing desired printing on the paper 5. After that, when the printing is completed, the printed paper 5 is discharged to the paper discharge cassette 26 by the paper discharge roller 28.

Therefore, also in the present embodiment, as in the above-described embodiment, the paper 5 after the front surface printing is conveyed to the paper insertion portion 14 by the return paper discharge roller 27 so that the paper 5 is reversed. Therefore, the transport mechanism for the sheet 5 is simple and the control is easy, and moreover, stable sheet feeding can be performed. Further, the back side printing can be properly performed, and the double-sided printing can be performed easily and surely.

The present invention is not limited to the above-mentioned embodiment, but various modifications can be made if necessary.

[0048]

As described above, in the printing apparatus according to the present invention, the paper after the front surface printing is conveyed to the paper insertion portion by the paper discharge mechanism so that the paper is reversed.
Since it is not necessary to reversely convey the paper as in the past, the mechanism for conveying the paper is simple and the control is easy, and moreover, it is possible to reliably prevent the paper from being caught due to the reverse conveyance, so that stable paper feeding is possible. Can be done. When printing on the back side, printing starts from the trailing edge of the paper. However, the printing information for one page is stored in the memory, and the final printing of the printing information stored in this memory is performed. Since information is taken out and printing is performed from the trailing edge side of the paper based on this printing information, backside printing can be performed properly, and double-sided printing can be performed easily and reliably. And so on.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a printing apparatus according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a control device of the printing apparatus of FIG.

FIG. 3 (a) is an explanatory view showing a front surface printing state, FIG.
(B) is an explanatory view showing the back side printing state

FIG. 4 is a schematic configuration diagram showing another embodiment of the printing apparatus of the invention.

5 is a block diagram showing an embodiment of a control device of the printing apparatus of FIG.

FIG. 6 is a schematic configuration diagram showing a conventional printing device.

[Explanation of symbols]

 1 Platen 2 Print Head 3 Paper Feed Roller 5 Paper 14 Paper Insertion Section 15 Paper Ejection Roller 16 Paper Ejection Guide 17 CPU 21 Memory 24 Paper Ejection Guide 27 Return Paper Ejection Roller 28 Paper Ejection Roller

Claims (4)

[Claims] 1. A paper inserting unit for inserting a predetermined paper is provided, and a paper carrying mechanism for carrying the paper inserted from the paper inserting unit to a print head is provided, and based on predetermined print information. Is a printing device for operating the print head to perform desired printing on the paper, and is provided with storage means for storing print information for at least one page of the print information, A paper discharge mechanism for discharging the paper to the paper insertion portion is provided, the paper discharged by the paper discharge mechanism is conveyed again, and the print head prints on the back surface of the paper based on the print information. A printing apparatus comprising: a paper transport mechanism and a control means for controlling the print head. 2. A plurality of predetermined sheets are stored and one sheet of this sheet is stored.
A paper feeding device for separating and feeding paper one by one is installed, and
In a printing device, which is provided with a paper feeding mechanism for feeding the paper fed by the paper feeding device to the print head portion, and which operates the print head based on predetermined print information to perform desired printing on the paper. In addition, a storage means for storing at least one page of print information among the print information is provided, a paper insertion portion for inserting a predetermined paper into the paper transport mechanism is provided, and the paper after printing is provided. A first paper discharging mechanism for discharging the paper to the paper inserting portion is arranged, the paper discharged by the first paper discharging mechanism is conveyed again, and the back side of the paper is printed by the print head. A control means for controlling the paper transport mechanism and the print head based on the print information, and ejecting the paper after the back surface is printed.
A printing apparatus having the paper discharge mechanism of 1. 3. When the back side printing is performed on the paper after the front side printing, the 1 stored in the storage means by the control means
3. The print information for a page is read from the end so as to control the print head.
3. The printing device according to claim 1. 4. The control unit alternately reads the print information for one page stored in the storage unit from the beginning to perform print control, and reads the print information from the end to perform print control alternately for each print page. The printing apparatus according to claim 1, wherein the printing apparatus is configured to perform the printing.