JPS62134282A - Printer printing on both sides of paper - Google Patents

Abstract

PURPOSE:To make the printing of both sides of paper possible, by a method wherein the discharge paper after printing the front of paper is again guided to a platen with a paper turning over roller other than the platen and a paper guide, and the back of the paper is printed by the reverse rotation of the platen and the rotation circuit of a letter pattern. CONSTITUTION:Letters are successively printed with a printing head 3 and a paper is sent upward. The paper is guided from one side port j of the paper guide 7 surrounding a paper turning over roller 6 to the paper turning over roller 6. The paper is turned over by the rotation of the paper caused by the rotation of the roller 6 and comes out from the other port k of the paper guide 7. When a paper presser 5 has already fallen the arrow (e) direction and the top of the paper reaches a platen 1, the paper presser 5 falls again to the arrow (f) direction and the platen 1 is rotated in the reverse arrow (h) direction. Then, the letter string of each line is printed in the sequence from the line end letter to the line top letter by the printing head 3. Furthermore, the letter pattern coming out from a letter pattern generator 10 is rotated by 180 deg. with a letter pattern 180 deg. rotation circuit 9 to be printed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot printer such as a wire dot type or a thermal transfer type, and more particularly to a printing printer that handles cut paper as paper.

[Conventional technology]

Conventionally, this type of dot printer has been widely used as a printing machine for word processors, etc., and has been able to print code data sent from word processors, etc., and perform automatic ejection and paper feeding operations using page break commands, etc. Documents can also be printed on standard cut paper with page management.

[Problem that the invention seeks to solve]

Although the conventional dot printer described above can print documents satisfactorily, it has the drawback of increasing the number of sheets because printing is possible only on one side of the paper.

An object of the present invention is to provide a printer that is capable of printing on both sides of paper, and to realize effective use of paper.

[Means for solving problems]

According to the present invention, in a dot printer that can handle cut paper as paper, it has a platen that can be rotated in forward and reverse directions, and the direction of the paper ejected from the platen after printing on two sides is changed, and the paper is turned over and printed again. A front and back printing printer is obtained which is characterized by having a paper turning roller and a paper guide for guiding the paper to the platen, and a 180° rotation circuit for printing characters and main turns in two front printing and back printing.

That is, in the present invention, the discharged paper after front side printing is guided to the platen again by a paper turning roller separate from the platen and a paper guide arranged so as to surround the paper turning roller, and the platen is rotated in the reverse direction. Printing on the back was realized using a 180° rotation circuit for the character pattern.

〔Example〕

- Next, two embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a front and back printing printer according to an embodiment of the present invention, which includes a platen 1 which can be rotated in forward and reverse directions, a paper guide 2
,7,8. Print head 3. Ink ribbon 4. It is composed of a paper turning roller 6, a character turn energizer 109, and a character turn 180° rotation circuit 9. Arrow a indicates paper feeding.

During paper feeding, the paper guide 8 is folded down in the direction of arrow C and guides the paper between the platen 1 and the paper guide 2. Next, the paper is pulled in by rotating the platen 1 in the direction of arrow g, passes between the platen 1 and the ink ribbon 4, and presses the paper by folding the paper presser 5 in the direction of f, completing the paper feeding operation, and rotating the platen 1. stop.

Next, the print head 3 prints one line of characters.

Line feeding is performed by rotating the platen 1 by one line in the direction of arrow g. In this way, characters are printed one after another and the paper is fed upward. As a result, the paper is guided from one opening j of the paper guide 7 attached so as to surround the paper turning roller 6 to the paper turning roller 6, and the paper turning roller 6 rotates in synchronization with the rotation of the platen 1. 6, the paper is drawn between the paper guide 7 and the paper turning roller 6. The paper is turned over by the rotation of the paper turning roller 6, so that the paper is turned over and comes out from the other opening k of the paper guide 7.

The positions of the platen 1 and paper turning roller 6 are set so that when the leading edge of the paper leaves the paper guide 7, the tail end of the paper leaves the platen 1 and the paper presser 5. When the paper leaves the paper guide 7, the paper presser foot 5 is sagging in the direction of arrow e. When the leading edge of the paper coming out of the opening of the paper guide 7 reaches the platen 1, the paper presser 5 falls down again in the direction of the arrow f, and the platen 1 rotates in the direction of the arrow opposite to the tip.

As a result, the paper is guided between the platen 1 and the ink ribbon 4, and the platen 1 is stopped. The preparation for printing on the back is now complete, and the print head 3 prints characters first. At this time, the character string of each line is printed in order from the last character of the line to the first character of the line. In addition, the character pattern output from the 2-character pattern generator 10 is rotated 1800 times when printing one side, and the mother turn is 2.
The character/main turn is generated in the 180° rotation circuit 9 and printed. In this way, send the lines one by one in the direction of the arrow.

By tilting the paper guide 8 toward the arrow d side, the paper printed on both sides is discharged in the direction indicated by the arrow.

Margins below [Effects of the Invention] As explained above, the present invention realizes printing on both sides of cut paper, which was previously impossible, in a dot printer, and has the effect of reducing the number of sheets of paper when printing 9 documents. , which has the effect of increasing the value of printers that use it.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a front and back printing printer according to an embodiment of the present invention. 1...Platen, 2,7.8...Paper guide, 3.
...Print head, 4...Ink cartridge, 5...Paper holder.

Claims (1)

[Claims] 1. In a dot printer that can handle cut paper as paper, there is a platen that can be rotated in forward and reverse directions, and the direction of the paper discharged from the platen is changed after printing on the front side, and the paper is turned over and guided to the platen again. 1. A front- and back-printing printer comprising: a paper turning roller and a paper guide; and a circuit for rotating a printed character pattern by 180° in front and back printing.