JPH0720719B2 - Print position correction method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer that prints on double-page spread pages such as passbooks, in order to align the print positions of all pages of the passbook to a fixed position, the start of printing that occurs for each double-page spread. The present invention relates to a method for correcting a position shift.

2. Description of the Related Art For example, when printing a passbook such as a deposit passbook or other booklets such as an amount of money, when the page to be printed in the passbook is opened and supplied to the printer, the printer positions the passbook. Then, the printing hammer in the printer was printing at a predetermined position.

Problems to be Solved by the Invention Generally, when a passbook 100 is closed (Fig. 5),
The edges 102 of the page are cut to be flush. Therefore, when the page to be printed of such a passbook is opened in a spread state, the end edge 102 of the passbook becomes a step-like shape which is displaced by x as shown in FIG. However, in the conventional printing apparatuses, when feeding the spread passbook to the print hammer portion, the sensor detects the leading edge portion A of the passbook and sends the passbook to the print hammer portion with reference to it.

For this reason, the conventional methods have a drawback that the print start position is displaced from page to page as shown in FIG. 7, and the print does not fit neatly into the ruled lines.

Means for Solving the Problems In order to solve the above problems, in the present invention, the paper thickness (see T in FIG. 6) is measured while feeding a passbook to a platen or a printing hammer, and the number of pages is determined based on the thickness. Let
The amount of deviation of the print position is input in advance according to the number of pages. An amount that should be corrected is calculated according to the determined number of pages, and the number of steps corresponding to this shift amount is obtained. When the passbook is sent to the actual printing station, the correction amount is added to feed the sheet.

Function The number of pages is determined by measuring the paper thickness, and the paper feed amount is adjusted by comparing with the pre-fixed input deviation amount per page, and the deviation of the printing position for each page is eliminated.

EXAMPLE FIG. 1 is a schematic view of a dot impact printer embodying the present invention, showing a state in which an upper cover is particularly extended. FIG. 2 shows the paper feed mechanism of the printer shown in FIG.
In these figures, 1 is a frame, 2a, 2a 'are a pair of primary feed rollers for feeding a sheet to a printing hammer, 2b, 2a
Reference numeral b'denotes a pair of secondary feed rollers for feeding the printed paper to the discharge portion, 3 is a carriage, 3a is a carriage traverse member, 4 is a print hammer, 5 is a ribbon cartridge, 6 is a paper pressing guide, and 7 is paper feeding. Tractor, 8 paper mode switching plate, 9a and 9b paper thickness measuring rollers, 10 paper edge detection sensor (photo interrupter) 11 paper hand insertion port,
12 is a paper thickness measuring sensor, 13a and 13b are paper discharge rollers, 14
Is a manually inserted paper detection sensor, 15 is a load roller, and 16 is an upper cover. The details and structure of each of these members are known to those skilled in the art.

FIG. 3 is a block diagram of a printer control unit of the printer of the present invention.

The present invention will be described in detail with reference to the flowchart of the present invention shown in FIG.

First, as shown in FIG. 5, a predetermined page of the passbook 100 in which the end portions 102 are aligned is opened. The end 102 of the passbook 100 is the sixth
As shown in the figure, a staircase shape is formed that is offset by x. In this state, the passbook 100 is inserted into the insertion slot 11 of the printer. Passbook 1
The presence / absence of 00 is detected by the detection sensor 14. After detection, passbook 100
Is supplied between the pair of load rollers 15 to the positions of the paper thickness measuring rollers 9a and 9b. In the normal state, the upper measuring roller 9a is sufficiently far from the lower measuring roller 9b which rotates around a fixed position, but when the paper 100 such as a passbook is supplied, the upper measuring roller 9a descends and becomes lower than the lower measuring roller 9b. The paper 100 is sandwiched between them. The lower measuring roller 9b of the vertically moving upper measuring roller 9a
The distance from or the amount of drop from the upper reference position is measured by the sheet thickness measuring CCD sensor 12, and this value is stored in the RAM.
Next, this measured value is compared with the reference data of the second sheet of paper, and if the measured value is not larger than the reference data, the correction step number of the first sheet is stored in the RAM as a correction amount. On the other hand, if it is larger, then it is compared with the reference data for the third sheet. If the measured value is larger than the reference data for the third sheet, it is further compared with the reference data for the fourth, fifth, ...

Next, the sheet 100 is sent to the print hammer section 4 by a pair of primary feed rollers 2a, 2a 'driven by a step motor (not shown). This feed amount is defined as (the number of distance steps from the paper thickness measuring roller 9 to the print hammer portion 4) + (the number of correction steps based on the above correction data). At this time, the paper edge detection sensor 10 detects an initial reference position (for example, point A in FIG. 6) of the paper 100, and supplies the paper by the above addition step number with this position as a reference.

After that, printing is performed by a known method, and the secondary feed rollers 2b and 2b 'eject the paper 100 to the outside of the machine through predetermined ejection rollers 13a' and 13b. The paper feed tractor 7 and the paper mode switching plate 8 are for supplying the paper 100 from other than the manual insertion port 11.

EFFECTS OF THE INVENTION According to the present invention, when a passbook or the like is supplied, it is determined which page is set by measuring the thickness of the sheet, and an appropriate feed correction amount is calculated based on this determination. Since the paper is fed based on, it is possible to always start printing from the same line on each page when printing on a passbook etc., the printing accuracy is improved, and uniform printing is always made within a predetermined ruled line. , The defect that the print is projected outside the ruled line is completely solved.

[Brief description of drawings]

FIG. 1 is a schematic view of a dot impact type printer embodying the present invention, FIG. 2 is a view showing a sheet feeding mechanism section of the printer of FIG. 1, and FIG. 3 is a block diagram of a printer control section of the present printer, Fig. 4 is a flowchart of the present invention, No. 5
The figure shows the folded and closed state of the passbook, Fig. 6 is an enlarged view of one edge when the passbook of Fig. 5 is expanded, and Fig. 7 shows that the printing position by the printer so far differs depending on the page. It is a figure showing the state where it is. Explanation of symbols 2a, 2a ': Primary feed roller 2b, 2b': Secondary feed roller 4: Printing hammer 9a, 9b: Paper thickness measuring roller 10: Paper edge detection sensor 11: Paper hand insertion slot 12: Paper thickness doctor Measuring sensors 13a, 13b: Paper ejection roller 100: Paper

Claims (1)

[Claims] 1. A printer for performing predetermined printing on a print medium having a stepwise pattern in which the end edge of the printing surface is sequentially shifted by a predetermined amount according to a change in the thickness of the printing surface when the printing surface is opened to a printer. Measuring the thickness of the fed print medium, determining the thickness of the print medium based on the measured value, setting the print start position in response to the thickness, and setting the print start for the print hammer section. A print position correction method that corrects the print start position according to the thickness change of the print medium, which consists of feeding the print surface of the print medium to the position and printing.