JPH0569608A - Detecting method for printing paper and setting method for first printing position - Google Patents

Abstract

PURPOSE:To directly decide the printing position on printing paper and to enhance of precision of a first printing position on the paper by providing a paper detection sensor to a carrier unit frame and detecting printing paper by transfer of the carrier frame unit. CONSTITUTION:An optical reflection type sensor 11 for detecting paper is provided in the vicinity of a printing head 13 on a carrier frame 16 which performs reciprocating actuation parallel to a platen 15. The sensor 11 detects the tip and the rear end of printing paper 18 carried in the rotation direction of the platen 15. Thereby setting of a first printing row and detection of finish of paper are performed. Moreover the sensor 11 detects both ends in the width direction of printing paper 18 in accordance with the reciprocating actuation of the carrier frame 16. Thereby setting of the first printing row and detection of width size of paper are performed. Thereby the first printing position on printing paper can be directly set and the positional precision is enhanced. Null printing on the platen is prevented by detection of width size of paper. Further printing is enabled to the lower end of paper by detection of finish of paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dot serial printer, and more particularly to a method for detecting a printing sheet and a method for setting a first printing position.

[0002]

2. Description of the Related Art A conventional dot serial printer has not particularly detected the paper width size among the sizes of printing paper. Further, regarding the detection of the length direction, as shown in FIG.
7 and inserts it against the roller portion of the feed roller assembly 26, feeds the print paper 24 with the platen 25 and the feed roller assembly 26, and then feeds the print paper 24 to the first print position (especially the first print position). Line) had been decided.

The detection of the trailing edge of the printing paper is such that the leaf piece 22 incorporated in the paper end sensor 21 moves to the platen 25 side when the printing paper 24 runs out, and is detected by the paper end sensor 21. There is. The leaf piece 22 receives a force from the contact point leaf spring of the paper end sensor 21 so that the leaf piece 22 is constantly pushed toward the platen 25.

Regarding the setting of the first printing position (particularly the first printing row) of the printing paper, the home position sensor 32 is fixed to the frame unit 31 as shown in FIG. The carrier frame 29 that reciprocates is contacted (or not contacted) by the sensor to determine the first print row.

[0005]

In the above-mentioned conventional method for detecting the printing paper, since the difference in the paper size, especially the width size of the paper is not detected, the platen may be empty depending on the input command. There is a problem in that the platen may be damaged, the platen may be damaged, and the print head may be easily damaged.

Further, in setting the first print line position on the paper, the paper is struck against the feed roller assembly,
At this time, the paper end sensor reads that there is paper, and the platen operates from that point by a specified angle amount to set, so depending on the paper setting method, the feed roller assembly There is a problem that the sheet slips at the time of suction when the sheet is fed by the platen, and the first print line position changes in proportion to the slip amount.

Further, in the conventional method of determining the first print row for the print paper, the user sets the print paper in accordance with the marks or the like on the outer cover, but actually, the print paper is installed in the cover. Since it is determined by the position of a certain frame unit and the home position sensor, there is a variation in the first print row with respect to the print paper between the devices. Furthermore, the uncertain method in which the user aligns with the mark also causes the deviation of the first print row from the designated location, and it is difficult to accurately determine the position of the first print row of the printing paper. There was such a problem.

[0008]

SUMMARY OF THE INVENTION A print sheet detecting method and a first print position setting method according to the present invention are provided in a dot serial printer in which light is emitted near a print head on a carrier frame which reciprocates in parallel with a platen. A reflection type paper detection sensor is provided, and the paper detection sensor detects the leading end and the trailing end of the printing paper conveyed in the rotation direction of the platen, thereby setting the first print line and detecting the end of the paper. According to the reciprocating motion of the carrier frame, the paper detection sensor detects both ends of the printing paper in the width direction, thereby setting the first print row and detecting the paper width size.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing the mechanism of a dot serial printer in one embodiment of the present invention, and FIG. 2 is a plan view thereof.

In this embodiment, a sensor shaft 12 is attached to a sensor bracket 12 near a print head 13 on a carrier frame 16 which reciprocates left and right by being guided by a guide shaft 10 fixed in parallel with a platen 15 to detect paper. It is configured to have a light reflection type sensor 11 for performing.

The printing paper 18 is abutted on the paper guide 17 up to the contact portion between the pressure roller assembly 19 and the platen 15, and the platen 15 is rotated when a paper feed command is issued from an operator panel (not shown). , Pressure roller assembly 19 and platen 15
The printing paper 18 is advanced in the direction of the arrow. The printing paper 18 is detected by the sensor 11 when it is further advanced following the paper guide 17, and then the platen 15 is rotated by a designated angle, and then the platen 15 is stopped to stop the feeding of the printing paper 18. 15 stops rotating, and the first print line position of the print paper 18 is determined. After that, the carrier frame 16 operates on the guide shaft 10, the sensor 11 senses the boundary between the platen 15 and the printing paper 18, and the width of the printing paper 18 is read.

FIG. 2 shows an example of reading the size of the printing paper 18 in the width direction, and the boundary between the arrow portions A and B is detected by the sensor 11 in order (the right carrier frame 16). After that, the carrier frame 16 moves to the left on the guide shaft 10, senses the position of the arrow A at the end of the print sheet 18 again, and prints the print sheet by the amount set in the first print row. The first print row position is determined by moving from the A portion to the B portion at the end of 18. The white collar (HP) 15a shown in FIG.
In contrast to the black color, the white part is provided. The carrier frame 16 moves immediately after the printer is turned on, and is temporarily fixed at the position of the carrier frame 16a. This is for designating a temporary home position (HP) position.

[0014]

As described above, according to the present invention, the paper detection sensor is provided in the carrier frame unit, and the printing paper is detected by the movement of the carrier frame unit. Therefore, the printing position on the printing paper is directly determined. And the accuracy of the first printing position on the paper is improved. Further, since the width size of the printing paper can be read, there is an effect that blank printing on the platen of the print head is eliminated. Furthermore, by providing a paper detection sensor near the print head, printing is conventionally performed and the paper end sensor senses when the bottom edge of the printing paper approaches, and there is a temporary printable portion of the paper. Although the operation has been stopped, the present invention has an effect that printing can be performed without stopping to the lower end of the paper.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration diagram of a dot serial printer in an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view showing an example of a conventional configuration.

FIG. 4 is a plan view of FIG.

[Explanation of symbols]

 10,30 Guide shaft 11 Sensor 12,23 Sensor bracket 13,28 Print head 14,20 Card holder 15,25 Platen 16,29 Carrier frame 17,27 Paper guide 18,24 Printing paper 19 Pressure roller assembly 21 Paper end sensor 22 Leaf piece 26 Feed roller assembly 31 Frame unit 32 Home position sensor

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 1, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014]

As described above, according to the present invention, the paper detection sensor is provided in the carrier frame unit, and the printing paper is detected by the movement of the carrier frame unit. Therefore, the printing position on the printing paper is directly determined. And the accuracy of the first printing position on the paper is improved. Further, since the width size of the printing paper can be read, there is an effect that blank printing on the platen of the print head is eliminated. Furthermore, by providing a paper detection sensor near the print head, printing is conventionally performed and the paper end sensor senses when the bottom edge of the printing paper approaches, and there is a temporary printable portion of the paper. Although the operation has been stopped, the present invention has an effect that printing can be performed without stopping to the lower end of the paper.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a side view showing a configuration diagram of a dot serial printer in an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view showing an example of a conventional configuration.

FIG. 4 is a plan view of FIG.

[Explanation of reference signs] 10,30 Guide shaft 11 Sensor 12,23 Sensor bracket 13,28 Print head 14,20 Card holder 15,25 Platen 16,29 Carrier frame 17,27 Paper guide 18,24 Printing paper 19 Pressure roller assembly 21 Paper End Sensor 22 Leaf Piece 26 Feed Roller Assembly 31 Frame Unit 32 Home Position Sensor

Claims (1)

[Claims] 1. In a dot serial printer, a light reflection type paper detection sensor is provided in the vicinity of a print head on a carrier frame that reciprocates in parallel with a platen,
The paper detection sensor detects the leading edge and the trailing edge of the printing paper conveyed in the rotation direction of the platen to set the first print line and detect the end of the paper, and the paper is reciprocated along with the reciprocating movement of the carrier frame. A method for detecting a print sheet and a method for setting a first print position, wherein a detection sensor detects both ends in the width direction of the print sheet to set the first print row and detect the paper width size.