JPS63207672A - Printer - Google Patents

Abstract

PURPOSE:To perform printing in accurate synchronism with the position of a paper, by reading rules or markers printed on a printing paper or markers provided separately on a transparent sheet or in a printer, and printing in synchronism with the markers. CONSTITUTION:A light-emitting element array 13 is so disposed as to receive reflected light from a printing paper 14 through an image-forming optical system 12. Rules 15 printed on the paper 14 are detected by the array 13, whereby the positions and displacements of the rules can be detected, and printing can be performed by a printing head 16 in synchronism with detection signals. The rules 15 may not be printed on the printing paper but may be provided separately from the paper, either on a transparent sheet which is placed on the paper or at a part in the main body 17 of a printer which part is not moved relative to the paper. Reading of such rules produces the same effect as above.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a printing device having a line-shaped printing head. [Prior Art] Conventionally, in a printing device having a line-shaped printing head,
The method of detecting the position of the printing paper is to detect the end face of the printing paper 14 using an infrared sensor 30 or the like as shown in FIG.
The paper is fed by a certain amount to the printing start position using the platen 31 and the paper pressing roller 32, and then printing is performed using the printing head 16 in synchronization with the paper feeding.

[Problems to be solved by the invention]

However, the conventional method requires a mechanism to hold the entire printing paper using a paper feed roller and a paper presser roller, which may cause the paper to meander and shift the printing position while feeding the paper to the printing start position. There is a problem in that uneven printing tends to occur due to uneven paper feeding from the beginning of printing. Further, in a printing device that does not hold printing paper inside the main body, there is a problem in that it is difficult to detect the paper position, and printing cannot be performed accurately in synchronization with the paper position. [Means for Solving the Problems] The present invention solves the above problems, and uses ruled lines or markers preprinted on printing paper, a separately prepared transparent sheet, or markers in a printing device. This method uses a method in which the image is read and printed in synchronization with the image. [Example] The details of the present invention will be described below with reference to the drawings. 1st
The figure is a schematic diagram showing an embodiment of the present invention. 11 is a light source such as a light emitting diode (not shown, but many are arranged parallel to the light receiving element array); 12 is an imaging optical system in which a large number of convergent light transmitters are arranged in an array; A light receiving element array (close contact or long image sensor) is arranged to receive reflected light from the printing paper 14 via the imaging optical system 12. 15 is a ruled line on the printing paper 14, and 16 is a printing head. In this embodiment configured as described above, the light receiving element array 13 detects l! on the printing paper 14. 'j, ll$15 can be detected, the position and amount of movement of the ruled line can be detected, and printing can be performed by the printing head 16 in synchronization with this signal. Also, ruled lines on printing paper are printing paper! Even if it is not the second method, there is a method of placing markers on a transparent sheet separate from the printing paper and reading it by placing it on the printing paper, or a method in which markers are arranged on a transparent sheet separately from the printing paper and read. A similar effect can be obtained by providing a portion that does not move, placing a marker there, and reading the marker. [Effects of the Invention] As described above, according to the present application, even if the printing device does not hold the printing paper inside the printing G: printing that is accurately synchronized with the paper position can be performed. Also, by rewriting the printing frame on the printing paper,
It also has the advantage of being able to print accurately at the f1 position. Furthermore, even when the printing paper is scanned several times by PI in order to print multicolor data, the printing position can be accurately adjusted each time. Furthermore, when reading a marker and generating a synchronization signal for printing, it is also possible to easily enlarge or reduce the size of the print by changing the frequency division ratio.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a printing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a conventional printing device. 11. Light source 12 for marker reading, Imaging optical system for marker reading '13. ．．
．． Light-receiving element array 14 for reading markers, . . . Markers on printing paper 15, . . . Printing head 17, . . . Printing device main body 30, . . 32. Above the paper presser roller Applicant: Seiko Epson Co., Ltd. Representative Patent Attorney Tsutomu Mogami and 1 other person Whistle 1 diagram

Claims (1)

[Claims] A printing device having a line-shaped printing head has a one-dimensional line-shaped contact type CCD sensor arranged on the side surface of the printing head in a direction parallel to the sub-scanning direction of the printing head. A printing device that reads ruled lines or markers printed on paper, a separately prepared transparent sheet, or markers in the printing device, and prints in synchronization with this.