JPH022050A - Printer for printing both surfaces of cut paper - Google Patents

Abstract

PURPOSE:To print both surfaces of paper by providing a printing control circuit for reversing printing data on the basis of the output from a paper sensor to output the same to a printing head. CONSTITUTION:A platen 2 having paper 1 set thereto is rotated in a forward direction and, after the start end of the paper 1 is detected by a paper sensor 3, the line feed in the forward direction is performed up to the position of a printing head 4 and the surface of the paper 1 is printed by the printing head 4. A solenoid 7 is turned ON during surface printing to close a paper feed-out port 5a so that the paper 1 is not sent in a paper reversal mechanism 5. When the line feed in the forward direction and the rear end of the paper 1 is detected by the paper sensor 3, the paper 1 remaining on the platen 2 is sent in the paper reversal mechanism 5 by forward line feed. Next, the solenoid 7 is turned OFF and the platen 2 is rotated in the reverse direction to perform the line feed of the paper 1 in the reverse direction up to the printing position. On and after, the line feed in the reverse direction and printing are alternately performed to print the rear of the paper 1. At this time, the data is reversed up and down by a printing control circuit M and reversed from the right end of one line to the left end thereof so as to reverse the left and the right and the reversal data is printed on the rear of the paper 1 by the printing head 4.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a cut paper double-sided printing printer.

[Conventional technology]

Conventionally, this type of printer performs printing by feeding the paper in only one direction, and has a structure that allows printing on one side.

[Problem to be solved by the invention]

When double-sided printing is performed using the above-mentioned conventional printer, the front side of the paper is printed, and then the operator inverts the paper and sets it to print on the back side.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printer that is capable of printing on both sides of paper.

[Means to solve the problem]

In order to achieve the above object, the cut paper double-sided printing printer according to the present invention includes a paper detection sensor that detects the starting edge and the ending edge of paper to determine whether or not there is paper passing through the print head, and It has a paper inversion R structure that inverts the paper and sends the paper toward the print head, and a print control circuit that inverts print data and outputs it to the print head based on the output from the paper detection sensor. be.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, a printer body 6 is rotatably installed with a platen 2 that wraps the paper 1 around its circumference and feeds it, and a print head 4 that prints on the paper 1 on the platen 2.
Equipped with. The print head 4 is located near the print head 4.
A paper detection sensor 3 is provided for detecting the starting and ending ends of the paper 1 passing through the print head 4, and the paper 1 that has passed through the print head 4 is received at the rear position of the print head 4, and the paper 1 is turned upside down and the paper is removed. A paper reversing mechanism 5 for sending paper 1 toward a printing head 4 is installed. Paper outlet 5a of the paper reversal i structure 5
is provided with a solenoid 7 for opening and closing the paper outlet 5a. The solenoid 7 also has a function of switching the path of the paper 1 to the paper discharge port 6a side other than the paper reversing mechanism 5 when printing on one side of the paper.

In the embodiment, paper 1 is set on platen 2, platen 2 is rotated in the forward direction, and paper 1 is detected by paper detection sensor 3.
After detecting the starting edge of , a line feed is performed in the forward direction to the position of the print head 4, and thereafter the front side of the paper 1 is printed by the print head 4. 6.During surface printing, the solenoid 7 is turned on and the paper feed port 5a is closed. so that the paper 1 is fed into the paper reversing mechanism 5. When the paper 1 is started with a line feed in the normal direction and the trailing edge of the paper 1 is detected by the paper detection sensor 3, the paper 1 remaining on the platen 2 is fed into the paper reversing mechanism 5 with a line feed in the normal direction.

Next, the solenoid 7 is set to 0FFL, the platen 2 is caused to feed in the reverse direction, and the paper 1 is caused to feed in the reverse direction to the print position. After that, reverse line feed and printing are performed alternately to print on the back side. At this time, the data from the 1st pin to the 24th pin is turned upside down by the print control circuit M described later, and the data from the right end of one line to the left f
! The paper up to fA is reversed from left to right and the reversed data is printed on the back side of paper 1 by the print head 4.6 Paper feeding after the reversal is performed after the paper detection sensor 3 detects the starting edge of paper 1, and then prints from the paper detection sensor 3. After performing a line feed for the length of the paper minus the distance to head 4, perform a line feed in the opposite direction to platen 2.
eject the remaining paper 1. When only one-sided printing is performed, the solenoid 7 switches the path of the paper 1 to the paper discharge port 6a and discharges the paper.

FIG. 2 is a block diagram showing an example of the print control circuit M of the present invention. That is, the data receiving circuit 9 receives data from the host device 8, the data analyzing circuit 10 analyzes the received data, and the data drawing circuit 11 converts the data into a dot pattern. The data analysis circuit 10 manages and controls the solenoid 7, the drive motor 14 for the platen 2, and the paper detection sensor 3.

If the paper detection sensor 3 detects paper presence or no paper during a line feed in the forward direction, or if a discharge command or the like is input from the host device 8, the data analysis circuit 10 causes the motor 14 to feed the line in the forward direction, and the paper shown in FIG. The paper is sent to the reversing mechanism 5, the solenoid 7 is operated, the motor 14 is reversely rotated, and the line feed is performed to the printing position. In the data drawing circuit 11, the data drawn with the 1st bin to the 24th pin upside down and the right end to the left end of one line left and right reversed for printing on the back side is input into the print buffer 12, and the data drawn is transferred to the print head 4. to print.

〔Effect of the invention〕

As described above, according to the present invention, there is an advantage that double-sided printing can be performed without the operator having to turn over the paper himself.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a print control circuit of the present invention.

Claims (1)

[Claims] (1) A paper detection sensor that detects the start and end edges of paper to determine whether there is paper passing through the print head, and paper reversal that reverses the paper that has passed the print head and sends the paper toward the print head. A cut paper double-sided printing printer comprising: a mechanism; and a print control circuit that inverts print data based on the output from the paper detection sensor and outputs the inverted print data to the print head.