JPH04312869A - Leaf printing device - Google Patents

Abstract

PURPOSE:To achieve printing action adjustment efficiently by measuring an error in a line feed distance automatically at the time of printing line feed and correcting the error. CONSTITUTION:First, a mark reading element 6 is moved in a printing direction to read a measurement mark 2 printed at the n-th line of a leaf for adjustment. Next, a measurement mark 3 printed at the n + 1st line is read by performing a line feed action. A tolerance correction part 8 obtains a difference between the width of the measurement mark 2 and the measurement mark 3 to calculate an error in a line feed amount. In addition, the tolerance correction part 8 corrects the tolerance of an action of a transport roller 4 based on the calculated result. For example, the difference between the calculated result of the error and a previously reference setting value is calculated and corrected so that it stays within a range of previously determined reference settings. Finally a control part 7 changes a line feed amount based on a correction by the tolerance correction part 8.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a paper sheet printing device that prints on paper sheets that have been conveyed, and in particular, it uses a mark reading element to automatically measure line feed errors and eliminate line feed errors. The present invention relates to a sheet printing device suitable for efficient adjustment.

0002

2. Description of the Related Art Currently, computers are widely used in many fields. The information processed by this computer is generally output by printing it on paper sheets such as sheets of paper using a paper sheet printing device. Paper sheet printing devices include those such as laser printers that do not carry out line-feeding operations for paper sheets, and those that do not carry out line-feeding operations such as laser printers, as well as devices such as those described in "Easy to Understand Peripheral Devices" edited by Takehiko Inoue.
(1971, published by Sanpo Publishing), pages 101 to 12
There are some line printers, such as the line printer described on page 4, that carry out printing by sequentially transporting inserted paper sheets in line feed.

[0003] In such a paper sheet printing device that prints on paper sheets while changing the line, errors in conveyance accuracy during printing occur due to tolerances in the sheet conveyance drive mechanism. In particular, an error in conveyance accuracy during a feed feed operation results in printing with inaccurate line spacing. The line spacing of characters printed by a printing device is set according to a predefined format in order to create a unified document. For this reason, the paper sheet printing device must adjust errors during the paper feed operation so that the line spacing is always a specified value. In order to correct such printing misalignment, it is necessary to compare the actual printed result with a reference value, calculate the corresponding correction value, and input the correction value to adjust the feed feed operation.

[0004] If all such correction operations were performed manually, it would take a very long time, so in the past, calculation of correction values in such correction procedures was performed by a computer to improve the efficiency of adjustment. I was planning. However, in such conventional techniques, it is necessary to manually measure the reference value and the actual printing result, and the printing operation cannot be adjusted in a sufficiently efficient manner.

[0005]

The problem to be solved is that it takes time to measure the error between the reference value and the actual printing result in the printing device. The purpose of the present invention is to solve these problems of the conventional technology, automatically measure the error in the line feed distance at the time of printing line feed caused by the tolerance of the conveyance drive system mechanism, and correct the error, thereby achieving an efficient method. An object of the present invention is to provide a paper sheet printing device that allows adjustment of printing operations.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the paper sheet printing device of the present invention moves over the n-th line of a sheet of paper as a printing medium and prints on this sheet of paper. A paper sheet that has a head, a line feed conveyance unit that conveys the paper sheet with a line break, and a control unit that controls the operation of the line feed conveyance unit and the print head, and that sequentially feeds the paper sheet with a line feed and prints on each line. In a similar printing device, the error value of the line feed position from the nth line to the n+1th line of the paper sheet, which occurs due to the tolerance of the line feed movement of the line feed conveyance unit, is displayed on the nth line and the n+1th line of the paper sheet. A measurement mark is attached to the print head to represent the measurement mark by comparing the measured values, and a mark reading element for reading the measurement mark is attached to the print head. and the value indicated by each of the measurement marks on the n+1th line, and calculate the error in the line feed position of the sheet by comparing the values of the measured measurement marks, and based on the calculation result of this line feed error, The present invention is characterized in that a tolerance correction section is provided to correct the tolerance of the line feed operation of the line feed conveyance section, and the line feed position of the paper sheet is adjusted by the correction by the tolerance correction section.

[0007]

[Operation] In the present invention, measurement marks are provided on the paper sheets used for adjustment to measure errors in the changeover operation. The measurement marks are, for example, identical black triangles arranged on each correct printing line. Then, in the nth line, while moving the print head in the printing direction, the mark reading element provided on this print head reads the measurement mark on the sheet of paper, and the width of the triangular measurement mark in the nth line is determined. To detect. Next, a new movement operation is performed, and the width of the triangular measurement mark on the (n+1)th row is detected in the same manner. By comparing the widths of the triangular measurement marks detected in this way, it is possible to automatically measure the error in the line feed position. Furthermore, based on this line feed error, a correction value for the line feed behavior is calculated, correction is made, and the line feed position is automatically adjusted.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. FIGS. 1(a) and 1(b) are configuration diagrams showing one embodiment of the configuration of a paper sheet printing apparatus according to the present invention.

FIG. 1(a) is a top view of a paper sheet printing device 10, and FIG. 1(b) is a side view. a conveyance roller 4, a print head 5 that prints on the conveyed paper sheet, a mark reading element 6 that moves together with the print head and reads the measurement marks 2 to 3 provided on the adjustment sheet 1, and a mark reading element 6. A tolerance correction section 8 that detects the width of each of the measurement marks 2 to 3 read by , compares the values with each other, and calculates a correction value for the line feed error; The control unit 7 controls the operation of the entire apparatus including processing operations according to the present invention.

The adjustment paper sheet 1 used in this embodiment has triangular measurement marks 2 of the same size on the n-th line and the n+1-th line, which are the line feed positions at intervals of a predetermined line feed amount (m).
3 are pre-printed.

With such a configuration, the paper sheet printing apparatus 10 of this embodiment performs processing control according to the present invention in the following manner.

First, the adjustment paper sheet 1 is carried in by the conveyance roller 4, and the mark reading element 6 is moved in the printing direction to read the measurement mark 2 printed on the nth line of the adjustment sheet sheet 1, and this measurement is performed. The width L1 of the mark is detected and registered by the tolerance correction section 8. Next, a changeover operation is performed, and the mark reading element 6 is moved in the printing direction again, and the nth
Read the measurement mark 3 printed on the +1st line. Then, the tolerance correction section 8 calculates the width L2 of the measurement mark 3. Here, the measurement mark 3 is triangular, and the width L2 of the detected measurement mark 3 increases or decreases with the amount of line feed from the n-th line to the n+1-th line. For example, if the line feed amount is equal to a predetermined amount, L1=L2, but if the line feed amount is greater than the predetermined amount, L1<L2, and if the line feed amount is less than the predetermined amount, L1>L2.

The tolerance correction section 8 compares the width L1 of the measurement mark 2 with the width L2 of the measurement mark 3, in this case finding the difference between them, and calculates the error in the line feed amount. Through this calculation, the error in line feed amount is measured. Further, the tolerance correction unit 8 corrects the tolerance of the operation of the conveyance roller 4 and the like in accordance with the calculation result of the line feed amount error. For example, by calculating the difference between the error calculation result and a preset reference value,
This calculated difference is corrected so that it becomes a preset reference range value. Then, based on the correction by the tolerance correction section 8, the control section 7 changes the line feed amount. Furthermore, perform the same operation again with the changed line feed amount and check.

In this manner, the paper sheet printing apparatus 10 of this embodiment automatically measures and corrects the error in the line feed amount, and can efficiently adjust the line feed amount.

In this embodiment, measurement marks 2 to
3 is normal printing, and the mark reading element 6 is an optical type. However, when magnetic ink is used for measurement marks 2 and 3, the mark reading element 6 uses a magnetic mark reading element. Similar processing is possible. Furthermore, the shape of the measurement mark provided on the adjustment paper sheet used in the present invention is not limited to that shown in FIGS. b)
It may also be something that is stated in .

FIG. 2(a) is similar to FIG. 1(a) and FIG. 1(b).
) is an explanatory diagram showing a second example of the adjusted paper sheet.

[0017] On the adjustment sheet 20, a measurement mark 201 is given as one triangle made of a line drawing, and in the nth line, the width L1 is detected based on the measurement points 202 and 203, and the width L1 is detected in the n+1th line. , the width L2 is detected based on the measurement points 204 and 205. Note that the triangular shape of the measurement mark 201 is not limited to a right triangle or an isosceles triangle. Further, the bottom side 206 may not be provided.

FIG. 2(b) is similar to FIG. 1(a) and FIG. 1(b).
) is an explanatory diagram showing a third example of the adjusted paper sheet.

A measurement mark 211 consisting of a straight line having an arbitrary angle with respect to the conveying direction is provided on the adjustment paper sheet 21, and in the nth line, the width L1 is determined based on the printing starting point 212 and the measurement point 213. is detected, and in the (n+1)th line, the width L2 is detected based on the print starting point 214 and the measurement point 215.

Note that the measurement marks 201 on each of the adjustment paper sheets 20 and 21 in FIGS. 2(a) and 2(b),
By filling in 211 with black, the respective widths L1 and L2 may be detected as shown in FIGS. 1(a) and 1(b). As described above, in the sheet printing apparatus of the present invention, FIGS. 1(a), B and 2(a), B
The structure of the measurement marks is not limited to those shown in the adjustment paper sheets 1, 20, and 21 in , but any structure that can be read by a mark reading element and shows a constant change in measurement value in the conveyance direction can be used. good.

As explained above using FIGS. 1(a) and 1(b) and FIGS. 2(a) and 2(b),
According to the paper sheet printing device of the present invention, the mark reading element is used to automatically measure the error between the actual line feed conveyance distance and a predetermined line feed value, and to correct the error. Change behavior can be adjusted. This reduces the time required for assembly and inspection of the device, and reduces the cost of the sheet printing device.

[0022]

[Effects of the Invention] According to the present invention, the error in the line feed distance at the time of printing line feed caused by the tolerance of the conveyance drive system mechanism is automatically measured, and the error is corrected to efficiently adjust the printing operation. It is possible to do so.

[0023]

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the configuration of a paper sheet printing device according to the present invention.

FIG. 2 is an explanatory diagram showing a second example of the adjusted paper sheet in FIGS. 1(a) and 1(b).

[Explanation of symbols]

1 Adjustment paper leaf 2-3 Measurement mark 4 Conveyance roller 5 Print head 6 Mark reading element 7 Control section 8 Tolerance correction section 10 Paper sheet printing device 20-21 Adjustment paper leaf 201 Measurement mark 202-205 Measurement points 206 Bottom 211 Measurement mark 212-215 Measurement points

Claims (1)

[Claims] 1. A print head that moves over the n-th line of a sheet of paper that is a print medium and prints on the sheet of paper, a line feed conveyance means that conveys the sheet of paper with a line break, the line feed conveyance means and the above. In a paper sheet printing device which has a control means for controlling the operation of a print head and prints on each line by sequentially changing the line of the paper sheet, the nth line and the n+th line of the paper sheet
Above the first line, there is a measurement mark that represents the error value of the line feed position from the n-th line to the n+1-th line of the sheet, which occurs due to the tolerance of the line feed operation of the line feed conveyance means, by comparing the measured values. and a mark reading element for reading the measurement mark on the print head, and a mark reading element for reading the measurement mark on the printing head, and a mark reading element for reading the measurement mark on the printing head;
Measure the values indicated by each of the measurement marks on the line and the n+1th line, compare the measured values of each measurement mark to calculate the error in the line feed position of the paper sheet, and calculate the line feed error calculation result. A paper sheet printing device based on the above, characterized in that a tolerance correction means is provided for correcting the tolerance of the line feed operation of the line feed conveyance means, and the line feed position of the paper sheet is adjusted by correction by the tolerance correction means.