JPH01257081A - Printer - Google Patents

Abstract

PURPOSE:To avoid printing directly on a platen and eliminate the need to adjust a printing position for each paper width by providing a position-recognizing sensor for recognizing the positions of tractors. CONSTITUTION:A pair of tractors 4 and 5 are slidably fitted to a shaft 6, and each of the tractors 4, 5 is provided with a linear sensor 7 for recognizing the position thereof on the shaft 6. The shaft 6 is provided with pattern data for position recognition, and the linear sensor 7 reads the pattern data to detect the present position of the relevant tractor 4, 5. A maximum printing range 8 for a printing head 2 is determined based on data on the current positions of the tractors 4, 5 detected by the linear sensors 7, and the head 2 is so controlled as not to print beyond the maximum printing range 8 even when erroneous data exceeding the range 8 is externally inputted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printer, and more particularly to a printer having a pair of tractors for feeding continuous printing paper.

In conventional printers, if the printing position is set incorrectly, the print will go beyond the width of the print paper and print directly onto the platen, shortening the life of the print head and platen, and even causing damage. There are drawbacks. Furthermore, when printing paper having different paper widths is used, it is necessary to set the printing position each time the paper is set, which is a drawback.

1. In view of the above, the present invention has been made to eliminate the drawbacks of the conventional products.The purpose of the present invention is to avoid direct printing on the platen, and to print as needed for each paper width. To provide a printer that does not require adjustment of the printing position.

1 Blood Suck Satomi The printer according to the present invention has a position recognition sensor for detecting the position of each of a pair of tractors for feeding printing paper.

fire hayo Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a side view thereof. Referring to these figures, a continuous printing paper 3 is fed by a pair of left and right paper feed tractors 4 and 5, and is printed by a printer head 2 on a platen 1. The print head 2 performs printing while being reciprocated by a carriage (not shown) within the maximum printing range 8.

A pair of tractors 11 and 5 are slidably attached to the shirt 1.6, and each of these tractors 4 and 5 has a 1-
Linear sensors 7 are installed to recognize the positions of the tractors 4 and 5 on the shaft 6, respectively. For this purpose, pattern information for position recognition is given to the shaft 6 in advance, and the linear sensor 7 reads this pattern information to detect the current positions of the corresponding tractors 4 and 5.

It is clear that if a magnetic sensor is used as the linear sensor 7, the pattern information on the shaft 6 will be magnetic information, if an optical sensor is used, the pattern information will be an optical pattern, and if an electrostatic sensor is used, it will be an electrostatic pattern. It is.

The maximum printing range 8 of the print head 2 is determined by the current position information of both tractors 4 and 5 detected by the linear sensor 7, and even if incorrect data exceeding the maximum printing range 8 is input from the outside, this It is controlled so that printing does not occur beyond range 8. Since printing control in this case can be easily performed by those skilled in the art, it will not be particularly explained.

According to the present invention, by providing a linear sensor that recognizes the position of the printing paper feed tractor, it is possible to detect the printing paper width and avoid direct printing on the platen. This has the effect of extending the life of the print head. Furthermore, there is no need to adjust the printing range for each set of printing papers with different printing widths, which has the effect of improving operability.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a side view thereof. Explanation of symbols of main parts 1... Platen 3... Printing paper 4
．． 5...Tractor 7...Sensor applicant NEC Corporation (1 other person)

Claims (1)

[Claims] (1) A printer having a pair of tractors for feeding printing paper, and comprising a position recognition sensor for recognizing the position of each of the tractors.