JPS631563A - High-quality color printer - Google Patents

Abstract

PURPOSE:To minimize color shift by inserting printing paper into a paper files provided with a printing position detecting marks every single dot or a plurality of dots and sending the printing paper together with the paper file at the time of printing. CONSTITUTION:A paper file 1 is set by engaging a feeder claw 13 of a paper file feed tractor 12 with a feeder hole 4 of the paper file 1 in such a way that a printing image exposed through a rectangular window 5 may be opposed to a printing head 11, under a condition that a printing paper (a) is sandwiched between a front sheet 2 and a back sheet 3. The paper file feed tractor 12 is rotated by a controlled drive reversible motor to feed return the paper file 1 by a prearranged amount to move the file. The a printing position detecting mark 6 is read by a printing position mark detector 14 to detect a feed position of the paper file 1 and at the same time, the control drive reversible motor is rotated under control to send the paper file 1 to a prearranged position or return the file while subjecting to a controlled movement to print a desired color on the printing paper (a) by means of a printing head 11.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to print position adjustment technology in a color printer having a structure in which printing paper is moved back and forth multiple times with respect to a print head, and is capable of achieving high quality with less color shift. This relates to color printers.

[Prior Art] Conventionally, there have been color printers that perform multicolor printing and have a structure in which printing paper is sent back and forth multiple times with respect to the print head in order to print in sequentially changing colors. When printing the first color, it detects the reference mark on the edge of the printing paper or the special paper, uses this as the reference position, feeds the printing paper, prints one screen, and when this printing is finished, removes the printing paper. The printer returns to the original position, detects the reference position again, and performs the printing operation for the second color over one screen, and by repeating this operation, color printing is performed.

[Problems to be Solved by the Invention] That is, during the above-mentioned color printing, the reference mark on the edge of the printing paper or on the special paper is detected only once at the start of printing for each color per screen, and printing occurs during printing. Paper misalignment is not taken into account. For this reason, in this type of color printer, there is a problem in that although a large print deviation does not occur at the start of printing, a large print deviation appears when printing is completed.

This invention was made in view of the above problem, and aims to provide a high-quality color printer with less color shift in a color printer having a structure in which printing paper is sent back and forth with respect to the print head multiple times. This is the purpose.

[Means for Solving the Problems] The high-quality color printer of the present invention inserts the print paper into a paper file in which a print position detection mark indicating the print position is provided for each dot or multiple dots, and when printing, the print paper is inserted into the paper file. The above purpose is achieved by sending the paper together with the paper file, and in a color printer that has a structure in which the printing paper is sent back and forth multiple times to the print head for color printing, the paper that holds the printing paper between them. In the case of 1-dot town, a printing part π detection mark indicating the printing position is arranged in parallel on the file, and the printing position detection mark is read by a detection device by tractor feeding or friction feeding the paper file. The gist of the present invention is to provide a structure that adjusts the drive timing of the print head.

[Function] Therefore, when executing the "feeding" of printing paper, the printing position detection mark for each dot or multiple dots provided on the paper file cooperating with the printing paper is detected even during printing, and the printing head Since printing is performed at an accurate position while adjusting the drive timing of the printer, there will be no printing misalignment from the start of printing to the end of printing.

[Embodiment] An embodiment of the high-quality color printer of the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view of a paper file with printing paper set, and Fig. 2 shows the printing section of the printer. This is a schematic diagram.

Reference numeral 1 denotes a paper file which is made of a durable sheet member of an appropriate thickness and folded in two into a front sheet 2 and a back sheet 3, and is supported by a feed claw 13 of a paper file feed tractor 12, which will be described later.
The tractor feed feed holes 4, 4, which engage with the
A large number of rectangular windows 5 are equally distributed along both side edges of the sheet member, and a rectangular window 5 is opened in a portion corresponding to the printing range of the front sheet 2 of the paper file 1, and a rectangular window 5 is provided between the front sheet 2 and the back sheet 3 of the paper file 1. The sandwiched printing paper a is held so that the printing surface thereof is exposed through the rectangular window 5. Reference numeral 6 designates lever-shaped print position detection marks arranged on one side of the front sheet 2 of the paper file 1 at equal intervals in the feeding direction every one pitch or several pitches corresponding to the print position, It is carved in a range exceeding the entire length of the rectangular window 5.

The paper file 1 includes printing paper a on a front sheet 2 and a back sheet a!
11 Paper file feeders are provided with shafts on both sides of the printing section 10 of the printer so that the printing surface exposed through the rectangular window 5 faces the print head 11 in the printing section 10 of the printer when sandwiched between the sheets 3. 12. Feed claw 13 of 12 and feed holes 4, 4 for tractor feed of the above-mentioned paper file 1
At the same time, the paper file feeding tractors 12 and 12 are controlledly rotated by a control drive reversible motor (not shown) to advance or return the paper file 1 by a predetermined amount. Reference numeral 14 is a print position mark detection device such as a photo sensor fixedly installed at a position facing the print position detection mark 6 of the paper file 1. The print position mark detection device 14 reads the print position detection mark 6 and In addition to detecting the feeding position of file 1, the control device (
(not shown), the control drive reversible motor is controlled and rotated, and the paper file 1 is fed or returned to a predetermined position while being adjusted and moved to print. Perform printing.

Therefore, when performing multicolor printing with this device, when printing the first color, the print position detection mark 6 of paper file 1
One screen of printing is performed by accurately feeding printing paper a while sequentially detecting The printing operation is performed over one screen, and color printing is performed by repeating this movement.
The printing position of the printing paper a is determined by the printing position detection mark 6 formed on the paper file 1 even during printing, while determining the relative position to the printing pad 11. Therefore, the printing paper a is sent back and forth many times. Also, the printing position does not shift from the printing start position to the printing part position.

In the above embodiment, the printing position detection mark was formed by bar-shaped printing engraved on the paper file, but the present invention detects the deviation of the moving scene during printing using a detection device installed in the printing section. Therefore, it is possible to achieve the purpose by Needless to say, the print position detection mark for reading the position of the paper file by the detection device can have various configurations depending on the variant.

[Effects of the invention As stated above, the high-quality color printer of this invention has
Printing position detection marks indicating the printing position are formed at regular intervals in the feeding direction of the paper file that holds the printing paper, and the paper file is tractor fed or friction fed to read the printing position detection marks by a detection device, and the printing is performed. Because the structure adjusts the drive timing of the head, printing is performed while correcting the print position at any time during the printing process.In a color printer that has a structure in which the printing paper is sent back and forth multiple times with respect to the print head, each color It has a special effect in that it enables high-quality printing with only a small amount of printing.

In addition, according to this invention, there is no need to use special paper with a print start mark provided, and the paper file can be used many times, so running costs can be reduced, and this color printer Since the printing position is detected and corrected every few dots, there is no need for an ultra-high precision paper feeding device, and the device is simple and inexpensive, resulting in economical effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a paper file in which printing paper is set, showing an embodiment of a high-quality color printer of the present invention, and FIG. 2 is a schematic diagram showing the printing section of the printer. 1... Paper file, 4... Tractor feed feed hole, 5... Rectangular window, 6... Print position detection mark,
10...Printing section, 11...Print head, 12...
Paper file feeding tractor, 14... Printing position mark detection device, 15... Ink ribbon, a... Printing paper.

Claims (1)

[Claims] (1) In a color printer that has a structure in which printing paper is sent back and forth to the print head multiple times for color printing, the printing position indicates the printing position for each dot or multiple dots in the paper file that holds the printing paper. In addition to arranging detection marks in parallel, by tractor feeding or friction feeding the paper file, the detection device reads the printing position detection mark and adjusts the drive timing of the printing head, thereby printing at an accurate position. A high-quality color printer that is characterized by: