JPS61192572A - Printer - Google Patents

Abstract

PURPOSE:To make it possible to simultaneously record the same line to the same positions of the front and back surfaces of recording paper, by making it possible to move one set of thermal heads in synchronous relation to each other so as to held recording paper between both heads. CONSTITUTION:Recording paper 12 is set between front and back side thermal heads 6, 10 by utilizing a paper presser 13 and, succeedingly, a page feed counter is reset and recording or control data is subsequently received in a predetermined data form from the interior. It is judged whether the page feed counter is zero, that is, the surface data of the recording paper 12 is being received. If said data is during reception, it is judged whether the received data is a page feed control code and, when said data is the page feed control code, the value of a page feed counter is set to +1. When said data is not the page feed control code, data to be recorded on the surface side of the recording paper is registered in a surface page buffer memory. By this method, two thermal heads are moved along the front and back surfaces of the recording paper in synchronous relation to each other and the recording data present in the buffer memory can be recorded and, therefore, recording can be performed to the same positions of front and back surfaces without shift.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a printer, and more particularly to a printer capable of simultaneous double-sided recording.

[Prior Art] In general, a normal printer has only one recording head, so if you want to record on both sides of recording paper, first record one page on the front side, then turn the recording paper over. Double-sided recording was performed by recording the pages on the back side.

However, when such a method is adopted, since the recording paper is turned over, the same lines do not overlap on the front and back sides of the recording paper and are often misaligned.

[Objective] The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and provides a printer configured to be able to simultaneously record the same line at the same position on the front and back sides of recording paper. It is intended to.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

Figures 1 and 2 are for explaining one embodiment of the present invention, and what is indicated by the symbol l in the figures is a motor (not shown).
A pulley 2 is provided opposite the pulley l, and a belt 3 is stretched between the two.

Further, another pulley 4 is arranged opposite to the pulley 2, and a belt 5 is stretched between the two, and this belt 5 has a thermal conductor for one side of the recording paper, for example, for surface recording. The head 6 is fixed.

In addition, another set of pulleys 7.8 facing pulleys 2 and 4
are arranged, and a belt 9 is stretched between them.

A back side recording thermal head 10 is provided on this belt 9, facing the front side recording thermal head 6.

There is a bell) 1 between pulley 2 and pulley 7 facing it.
1 are strung up in a crossed state.

Rotate the pulley 7 in the opposite direction to the pulley 2, and the head 6
, IO are moved synchronously.

In addition, there is a sheet of recording paper between one set of thermal heads 6.10.
2 is placed in a state where both ends in the width direction are pressed by paper pressers 13.

Two thermal heads 6.10 each have a driver 14.1
5 to the control circuit 16.

Further, a page break counter 17 is connected to the control circuit 16, and a buffer memory 18 for the front page and a buffer memory 19 for the back page are also connected.

Recording data to be recorded on the front page and the back page is sent and stored in these buffer memories 18 and 19 from a sending side (not shown) or a host computer.

Next, the operation of this embodiment configured as above will be explained with reference to the flowchart shown in FIG.

First, in step Sl, the front and back thermal heads 6.
10, set the recording paper 12 using the paper presser 13.

Subsequently, in step S2, a page break counter is reset. Subsequently, in step S3, recording or control data is received from within in a predetermined data format.

Then, in step S4, it is determined whether or not the page break counter is zero, that is, whether data on the front side of the recording paper is being received. If the data is being received, the process advances to step S5; otherwise, the process proceeds to step S5. Proceed to step S8.

In step S5, it is determined whether the received data is a page break control code, and if it is a page break control code, the process proceeds to step S7, where the value of the page break counter is incremented by one. on the other hand,
If it is not a page break control code, the data to be recorded on the front side of the recording paper is registered in the front page buffer memory, and the process returns to step S3.

On the other hand, in step S8, similarly to step S5, it is determined whether the received data is a page break control code, and if it is not a page break control code, the received data is registered in the back page buffer memory (step S9). , and step S
Return to 3.

On the other hand, if the data received in step S8 is a page break control code, the process proceeds to the next step SIO, records the same lines on the front and back sides of the recording paper simultaneously until the contents of each buffer memory are exhausted, and causes a page break in the first step Sll. and wait for the next recording paper to be set.

Thereafter, the same operation is repeated to record the same line at corresponding positions on the front and back sides of the recording paper.

In this way, the two thermal heads can be synchronized and moved along the front and back sides of the recording paper to record the record data in the buffer memory, making it possible to record at the same position on the front and back without shifting. can.

In the embodiment described above, a thermal printer is used as an example of a printer, but the present invention can also be applied to other printers such as an inkjet printer.

[Effects] As is clear from the explanation in H below, according to the present invention, a pair of thermal heads are arranged so as to be able to move synchronously with the recording paper in between, and each of the front and back sides stored in the buffer memory is Since it is configured so that the recorded data can be recorded simultaneously, it is possible to print the same line on both sides at the same time.
There is no need to turn over the recording paper since only the front and back rows are aligned.

[Brief explanation of drawings]

The drawings are for explaining one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram, and FIG. 2 is a flow chart diagram for explaining the control operation. 1.2, 4, 7.8... Pulley 3.5, 9.11... Belt 6... Thermal head for front side recording 10... Thermal head for back side recording 12... Recording paper 13.・Paper presser diagram 1

Claims (1)

[Scope of Claims] A set of recording heads is provided to move synchronously with a recording paper in between, and a buffer memory is provided to store recording data recorded by each recording head, and the recording data for the front and back sides of the recording paper is provided. What is claimed is: 1. A printer characterized in that it is configured so that it can simultaneously read out and record on the front and back sides of recording paper.