JPH0516464A - Printer - Google Patents

Abstract

(57) [Summary] [Purpose] Regarding a printer that ejects printing paper in the direction in which it returns to the original position before suction, in order to correct the curl at the trailing edge of the printing paper when ejecting the paper, move the carriage in the space direction. An object of the present invention is to provide a printer in which a paper jam does not occur when the print paper is returned from the side to the front position after being moved left and right. [Structure] Inputting a signal from the paper trailing edge position detecting means 6,
When the trailing edge 100b of the print sheet is located at a position away from the sheet transport path 61, the sheet feeding means 5 is driven and the trailing edge 100b of the print sheet reaches the inside of the sheet transport path 61.
A sheet preliminary feeding unit 8 for feeding the sheet 00 in the discharging direction is provided and configured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer which discharges printing paper in a direction in which it returns to the original position before suction.

In a so-called horizontal printer or the like, printing paper is sucked from a table and discharged again to the table. In this case, when the paper is discharged, the printing paper is fed from the printing unit into the paper conveyance path with the rear end side as the leading end.

However, since the printing paper curls toward the surface on which the printing is performed, when printing is performed up to near the rear end of the printing paper, the trailing end of the printing paper curls, and the inside of the paper transport path is discharged when the paper is discharged. The paper is not fed smoothly, resulting in a paper jam. Therefore, it is necessary to take some measures to prevent such a paper jam.

[0004]

2. Description of the Related Art In order to prevent a jam of the trailing edge of the sheet when ejecting the sheet, the trailing edge of the printing sheet is pushed into the sheet conveying path before the sheet is ejected and the trailing edge of the printing sheet is curled. Should be corrected.

Therefore, conventionally, the paper guide attached to the carriage moves the carriage left and right in the space direction while pressing the rear end portion of the printing paper against the curl to push the rear end of the paper inward.

[0006]

However, as shown in FIG. 6, the trailing end portion 100b of the printing paper 100 has the paper conveying path 91 even after the carriage is moved in space to correct the curl of the printing paper. When the carriage 93 is located at the tapered paper edge guide portion 92 formed at the entrance of the carriage, it is attached to the carriage 93 when returning the carriage 93 from the side of the print paper 100 to the front of the print paper 100 prior to the paper discharge. The paper guide 95 catches on the side edge of the print paper 100, and a paper jam occurs.

Therefore, according to the present invention, in order to correct the curl of the trailing end portion of the printing paper at the time of discharging the paper, the carriage is moved left and right in the space direction, and then the paper is returned from the side to the front position of the printing paper. It is an object of the present invention to provide a printer that does not cause a jam.

[0008]

In order to achieve the above object, the printer of the present invention is equipped with a print head 13 for printing on a print paper 100 as shown in FIG. A carriage 12 movably provided in the space direction along the surface of the printing paper 100, a spacing means 3 for moving the carriage 12 in the space direction, and printing the printing paper 100 facing the print head 13. When the sheet is sucked into the unit 10 and discharged, the sheet feeding unit 5 that discharges the print sheet 100 from the side of the sheet rear end 100b toward the position before the suction, and the sheet for detecting the position of the print sheet rear edge 100b. The trailing edge position detecting means 6 and a sheet carrying unit formed on the sheet suction and discharge side of the printing unit 10 so as to guide the traveling of the printing sheet 100 and substantially parallel to the sheet surface. A road 61, when the printing paper 100 is discharged, the paper trailing edge 10 as the head of the paper movement
In order to guide 0b into the paper transport path 61, the paper edge guide portion 63 provided by opening in a taper shape from the paper transport path 61 toward the printing portion 10 and the print paper 100 are discharged. At this time, before the carriage 12 moves in space from the side of the print sheet 100 to a position facing the print sheet 100, a signal is input from the sheet trailing edge position detecting means 6 to output the print sheet trailing edge. 10
0b is at a position deviated from the paper transport path 61, the paper feeding means 5 is driven to drive the rear end 1 of the printing paper.
Paper preliminary feeding means 8 for feeding the printing paper 100 in the discharge direction until 00b reaches the inside of the paper transport path 61.
Is provided.

Before the printing paper 100 is fed by the paper preliminary feeding means 8, the carriage 12 is moved in the space direction by the spacing means 3 to correct the curl of the printing paper 100. You may do it.

Further, the printing paper 100 may be sucked and discharged horizontally by the paper feeding means 5.

[0011]

When the printing paper 100 is ejected, it is ejected from the rear end side of the paper in the direction of returning to the direction before the suction.

At that time, before the carriage 12 moves in space from the side of the printing paper 100 to the position facing the printing paper 100, the paper preliminary feeding means 8 is provided.
However, when a signal is input from the paper trailing edge position detecting means 6 and the print paper trailing edge 100b is at a position deviated from the paper transport path 61, the paper feeding means 5 is driven and the print paper trailing edge 1 is driven.
Printing paper 100 until 00b reaches inside the paper transport path 61.
Paper in the paper ejection direction.

[0013]

Embodiments will be described with reference to the drawings. FIG. 2 shows the overall configuration of the printer. In the figure, 10 is a printing unit for printing on the printing paper 100. 11 is a platen. A carriage 12 is movably provided in a space direction along a stay shaft 16 provided in parallel with the platen 11.

A print head for printing on the print sheet 100 is attached to the carriage 12, and a head cover 14 is covered on the print head. 15
Is a ribbon cassette loaded with an ink ribbon for printing, and is detachably attached to the carriage 12. Reference numeral 17 denotes a plate-shaped paper guide attached to the carriage 12 so as to closely face and oppose the surface of the printing paper 100.

A space motor 30 serves as a drive source for driving the drive belt 31 connected to the carriage 12 to move the carriage 12 in the space direction. 40
Is a table on which the printing paper 100 is placed. The printing paper 100 is sucked into the printer from the table 40 side, printed, and then discharged to the table 40 side again. Reference numeral 41 is the sheet suction / discharge port.

FIG. 3 is a partial side view of the printer described above. A pair of paper feed rollers 51a, 51b, 52a, 52b are arranged in front of and behind the platen 11, and are rotationally driven by the line feed motor 50. A step motor is used as the line feed motor 50. The platen 11 is also driven to rotate in the same direction by the line feed motor 50. Therefore, by controlling the rotation of the line feed motor 50, the printing paper 100 can be sucked into or discharged from the printing unit 10 through the paper suction / discharge port 41.

The paper feed paths 61 and 62 are provided with the print paper 100.
In order to guide the paper straightly and horizontally, it is formed horizontally in parallel with the paper surface on the front side (paper intake / exhaust port 41 side) and the back side across the printing unit 10. However, in the following description, the sheet conveyance path 61 on the side of the sheet suction / discharge port 41 is simply referred to as “sheet conveyance path 61”.

On the inner end side of the paper transport path 61, a paper edge guide portion 63 is formed so as to open in a tapered shape from the paper transport path 61 toward the printing section 10. When the print sheet 100 is discharged to the table 40 side, the sheet edge guide portion 63 causes the sheet trailing edge 100, which becomes the head of the sheet traveling.
b is guided into the paper transport path 61.

A paper detection sensor 60 is provided inside the paper feed rollers 51a and 51b along the paper transport path 61. As the sheet detection sensor 60, any type such as a mechanical lever sensor may be used.

In FIG. 3, the space direction is perpendicular to the plane of the drawing, and the carriage 12 moves in the space direction along the stay shaft 16 and the carriage 12
The paper guide 17 attached to the paper also moves along with the surface of the print paper 100 in the space direction.

FIG. 4 shows a main circuit of the printer described above. The main control unit 70 has a CPU, a RAM, a ROM, etc. built therein, and receives a print signal and the like from a host device (not shown). From the paper detection sensor 60, detection signals for detecting the front end and the rear end 100b of the print paper 100 are input.

At the output end of the main controller 70, the space controller 71 for controlling the operation of the space motor 30, the line feed controller 72 for controlling the operation of the line feed motor 50, and the printing operation of the print head 13. A print control unit 73 for controlling the printer is connected.

FIG. 5 is a control flow for ejecting the printing paper 100 after printing is completed. S indicates a processing step. This flow starts when printing is completed up to the last line of the printing paper 100 or when an instruction to forcibly eject the printing paper 100 is issued.

When the printing paper 100 before that is sucked, the trailing edge 100 of the printing paper is detected by the paper detection sensor 60.
The number of steps of the line feed motor 50 when b is detected is stored, and the position of the trailing edge 100b of the paper after that can be calculated from the number of steps of the line feed motor 50.

In this process, first, the carriage 12 is moved to the left end position of the spacing operation range in space.
Subsequently, the space is moved to the right end position and stopped there (S1). As a result, the printing paper 100 is pressed by the paper guide 17 over the entire width, and the paper rear end 100b is pressed into the paper end guide portion 63. At this time, the left end of the spacing operation range is the printing paper 100.
The carriage 12 and the paper guide 17 cannot be separated from the surface of the printing paper 100 there because it coincides with the left end of the paper. However, since the right end of the spacing operation range is wider than the width of the printing paper 100, the carriage 12 and the paper guide 17 are displaced to the side of the printing paper 100 there.

Subsequently, the position of the trailing edge 100b of the paper is calculated (S2), and it is determined whether the print paper 100 is in the paper transport path 61 (S3). Then, the trailing edge of the sheet 100
When b is in the paper conveyance path 61, the carriage 12
To the center position of the printing paper 100 (S
4) Then, the paper is continuously ejected (S5).

In S3, when the trailing edge 100b of the sheet is inside the sheet edge guide portion 63 and is not in the sheet conveying path 61, the line feed motor 50 is reversely driven until the trailing edge 100b of the sheet enters the sheet conveying path 61. Then, the paper is fed in the discharge direction (S6). As a result, the trailing edge of the paper 100
It is ensured that the sheet guide 17 does not get caught in the side edge of the print sheet 100 even when the carriage 12 moves in the space from the side of the print sheet 100 toward the front side by entering the sheet conveyance path 61b.

Then, the carriage 1 is continued.
After space 2 is moved to the front position of the printing paper 100 so that the paper guide 17 guides the printing paper 100, the paper is discharged (S4, S5).

[0029]

According to the printer of the present invention, when the print sheet is discharged in the original direction of the suction, before the carriage moves the space from the side of the print sheet to the position facing the print sheet, Since the paper is fed into the narrow paper transport path, paper jam does not occur due to the movement of the carriage space even if there is curl at the trailing edge of the paper, and it is possible to continue and smoothly discharge the paper. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of the present invention.

FIG. 2 is a perspective view of an example.

FIG. 3 is a partial side view of the embodiment.

FIG. 4 is a circuit block diagram of an example.

FIG. 5 is a processing flow chart of the embodiment.

FIG. 6 is a schematic view of a conventional example.

[Explanation of symbols]

3 Spacing means 5 Paper feeding means 6 Paper trailing edge position detection means 8 Paper preliminary feeding means 10 Printing section 12 carriage 13 print head 61 Paper transport path 63 Paper edge guide 100 printing paper 100b Rear edge of printing paper

Claims (3)

[Claims] 1. A printing head (13) for carrying out printing on a printing paper (100), comprising the printing paper (10).
The carriage (12) provided movably in the space direction along the (0) plane, the spacing means (3) for moving the carriage (12) in the space direction, and the printing paper (100) as described above. A sheet feeding unit (5) that sucks the print sheet (100) facing the print head (13) and discharges the print sheet (100) from the sheet rear end (100b) side to the position before the suction when discharging the sheet. ), A paper trailing edge position detecting means (6) for detecting the position of the printing paper trailing edge (100b), and a paper from the printing section (10) for guiding the running of the printing paper (100). A sheet conveying path (61) formed substantially in parallel with the sheet surface on the suction and discharge side of the sheet, and the sheet rear end (100b) that becomes the head of sheet traveling when the printing sheet (100) is discharged. Paper transport path For guiding in 61), the paper transport path (61)
To the printing unit (10) from the sheet end guide unit (63), and the carriage (12) when the printing sheet (100) is discharged, the printing sheet (100). ), A signal is input from the paper trailing edge position detecting means (6) before the space is moved to the position facing the printing paper (100) from the side, and the printing paper trailing edge (100b) is moved to the above position. When it is out of the sheet transport path (61), the sheet feeding means (5) is driven to drive the trailing edge (100) of the printing sheet.
A printer provided with a paper preliminary feeding means (8) for feeding the printing paper (100) in the discharge direction until b) reaches the inside of the paper conveyance path (61). 2. The carriage (12) is moved in the space direction by the spacing means (3) before the printing paper (100) is fed by the paper preliminary feeding means (8), and the printing is performed. The printer of claim 1, wherein the curl of the paper (100) is straightened. 3. The printer according to claim 1, wherein the printing paper (100) is sucked and discharged horizontally by the paper feeding means (5).