JP3060295B2 - Paper transport control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for transporting paper to a predetermined position, such as a printer, and performing printing at a position where printing has been performed in advance, and relates to improving the accuracy of paper transportation.

[0002]

2. Description of the Related Art In an apparatus for performing printing on paper, the printing of paper in the vertical direction is performed not at a line designation for printing at a fixed position from the leading edge of the paper, but at a pre-printed position on the paper. Conventionally, a mark is placed on the paper set insertion slot, a mark printed in advance on the paper is aligned with the mark, and the distance between the mark on the paper set insertion slot and the printing section is fed. Printing. In this case, since the distance between the mark of the paper set insertion slot portion and the printing unit differs for each device, the paper feed amount is corrected for each device.

[0003]

However, the paper feed of such an apparatus is performed by rotation of a rubber roller or the like in order to prevent the paper from slipping. In this case, there is a problem that the outer diameter of the roller changes due to the influence of temperature and the like, and even if the roller rotates by the same amount, the feed amount of the paper changes, and the printing position and the like deviate from the mark position of the paper. Therefore, the present invention aims to solve this problem.

[0004]

According to the method of the present invention, a sheet on which a portion to be printed is set at a mark position provided in a sheet set insertion base portion is transported to a printing section of the apparatus to perform printing. In the method, a plurality of sensors for detecting the paper are provided in the paper transport direction, and the distance from the mark position to the printing unit, the distance between the sensors, and the transport of the paper from the leading edge of the paper set at the mark position are performed. The conveyance of the sheet is controlled using the distance to the sensor that detects the sheet first after the start. Further, while measuring the distance d from the leading edge of the sheet set at the mark position to the sensor that first detects the sheet after the conveyance of the sheet is started, the sensor at the position closest to the printing unit detects the distance d. Is transported until the paper is detected, and furthermore, from the distance L from the mark position to the printing unit, a sensor for detecting the paper first after the transportation of the paper is started and a position closest to the printing unit. Distance L2 between the sensor and
The sheet is conveyed by a distance obtained by subtracting the measured distance d.

[0005]

FIG. 1 is a layout diagram of rollers and sensors for explaining a sheet conveying method according to the present invention. Rollers 1a to 1d for paper feed and sensors 2a to 2d for paper detection are provided between the mark 3 and the printing unit 4 of the paper set entrance table.
And are arranged. Then, the rollers 1a to 1d between the mark 3 and the printing unit 4 of the paper set entrance table are rotated by a motor (not shown) to feed the paper 5 between predetermined printing positions.

In the case of the present invention, the mark 3, the first sensor 2a, and the second
b, the third sensor 2c, the fourth sensor 2d, the positions of the printing unit 4, and the distances between them are stored at the time of device adjustment (normal temperature). The sheet 5 is set with its position mark 5a aligned with the mark 3 on the sheet set insertion base, and conveyed from that position so that the position mark 5a of the sheet comes to the printing section 4. At this time, while measuring the distance d to the second sensor 2b for detecting the sheet at the position where the sheet is set and the sheet is started to be conveyed from the set position, the position of the sheet closest to the printing unit 4 is measured. The sheet is transported until the four sensors 4d detect the sheet. Further, from the distance L between the mark 3 of the sheet set insertion base portion and the printing section 4, the distance d to the second sensor 2b which is activated first after the conveyance of the sheet is started, and from the second sensor 2b By feeding the distance obtained by subtracting the distance L2 to the fourth sensor 2d, the position mark 5a of the sheet is positioned on the printing unit 4.

That is, conventionally, the distance L between the mark 3 of the paper set insertion slot base and the printing unit 4 is obtained from the rotation amount of the roller, and the paper is conveyed by the distance L.
On the other hand, in the present invention, the sheet feed amount M after the fourth sensor 2d detects the sheet is determined as M = L-L2-d. Here, L2 is a length determined for each device, and M and d are distances calculated from the rotation of the rollers. Accordingly, by setting M and d to be as short as possible, extremely high-precision paper transport control becomes possible.

It is to be noted that as many sensors as possible are provided,
If a sensor is provided in the back of the printing unit 4 and the transport distance determined by the sensors is made as long as possible, the accuracy of the paper feed amount can be further improved.

[0009]

According to the method of the present invention, the sheet feed amount determined by the outer diameter of the roller is reduced, and the feed amount at a fixed distance between the sensors is increased, so that more accurate sheet feed is possible. .

[Brief description of the drawings]

FIG. 1 is a layout diagram of a roller and a sensor for explaining a sheet conveying method of the present invention.

[Explanation of symbols]

 1a to 1d Roller 2a 1st sensor 2b 2nd sensor 2c 3rd sensor 2d 4th sensor 3 Mark of paper set insertion slot base 4 Printing unit 5 Paper 5a Paper position mark

────────────────────────────────────────────────── ─── Continuing on the front page (72) Masakazu Terami 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Tatsuya Takekawa 4 Tsunashima East, Kohoku-ku, Yokohama, Kanagawa Prefecture Chome 3-1, Matsushita Communication Industrial Co., Ltd. (72) Inventor Kouki Sato 4-3, Jonai, Hanamaki City, Iwate Prefecture Inside Shinko Seisakusho Co., Ltd. (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H ^7/ 00-7/20 B41J 11/42 B41J 13/00 B65H 5/06 B65H 11/00

Claims (2)

(57) [Claims] 1. A mark position provided on a paper set insertion base portion.
Place the paper to be printed on the paper
In the method and conveyed to the printing unit for printing or the like, a plurality of sensors for detecting the sheet in the conveying direction of the sheet, before
Distance from the mark position to the printing unit, between the sensors
Distance and the leading edge of the paper set at the mark position
The paper is detected first after the conveyance of the paper is started
Controls paper transport using the distance to the sensor ,
A sheet transport control method characterized by the above-mentioned. 2. The leading edge of a sheet set at the mark position
First while measuring the distance d to the sensor for detecting the the paper, the paper until the sensor of highest <br/> position close to the printing unit detects the the paper after the conveyance of the sheet is started from the Further, from the distance L from the mark position to the printing unit , between the sensor that first detects the paper after the conveyance of the paper is started and the sensor at the position closest to the printing unit 2. The sheet transport control method according to claim 1, wherein the sheet is transported by a distance obtained by subtracting the distance L2 and the measured distance d.