JPH06340155A - Printer - Google Patents

Abstract

PURPOSE:To obtain a printer detecting completion of paper discharge when printed paper is completely released from a paper discharge roller and eliminating winding of discharged printed paper around the paper discharge roller and jamming of printed paper to be discharged next in a color video printer. CONSTITUTION:The presence/absence of printed paper in the vicinity of an oulet of a paper discharge roller 1 is detected by a detection lever 7 detecting printed paper 13 discharged from the paper discharge roller 1 and a detection sensor 10 detecting the rotation of the detection lever 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer for leaving a recorded image such as a video image as a hard copy, that is, a so-called color photograph. The present invention relates to a paper ejection mechanism for ejecting paper.

[0002]

2. Description of the Related Art Conventionally, as a paper discharge mechanism of this type, there has been one as shown in FIG. In the figure, reference numeral 7
Reference numeral 1 denotes a paper discharge roller pivotally supported by a shaft 71a rotated by a drive source such as a motor (not shown), and 72 is a pressing roller that rolls in pressure contact with the paper discharge roller 71. It is attached to a holder 75 whose center of rotation is a supported shaft 74, and a spring 76
Is pressed against the paper discharge roller 71.

Reference numeral 77 denotes a paper discharge passage through which the print-processed paper 78 is discharged. In the paper discharge passage 77, a detection sensor 79 is arranged immediately before the above-mentioned paper discharge roller 71. 80
Is a paper ejection tray for accommodating the printing processed paper 78 ejected by the paper ejection roller 71.

The conventional paper discharging mechanism having the above structure is
The print processing paper 78 passes through the paper discharge passage 77 and the paper discharge roller 7
It is detected that the print processing paper 78 has been ejected when the rear end of the print processing paper 78 has been conveyed by the first and pressing rollers 72 and has passed the detection sensor 79.

[0005]

However, in the conventional paper discharge mechanism as described above, when the print processing paper 78 passes the detection sensor 79, the print processing paper 78 is incompletely pinched by the paper discharge roller 71. Even when the paper is being discharged, the paper discharge roller 7
1 has rolled up the printing processed paper 78 on which the printing has been completed, around the paper discharge roller 71.

Further, although the warp or the like is apt to occur on the paper on which printing by the sublimation type thermal transfer type color printer has been finished, when the warped print-processed paper blocks the discharge port, it is discharged next. However, there is a problem in that the photographic processed paper causes a jam near the discharge roller 71.

The present invention has been made in order to solve the above-mentioned problems, and when the printing paper is completely separated from the paper discharge roller, it is detected that the paper discharge is completed and the paper is discharged. An object of the present invention is to obtain a printer in which a print processing paper is wound around a paper discharge roller and a jam of the print processing paper discharged next is eliminated.

[0008]

In order to achieve the above-mentioned object, a printer according to the present invention includes a paper discharge roller that is driven to rotate and discharges the print processing paper, and presses the print processing paper to sandwich the print processing paper. The pressure roller that conveys the paper, the rotatable detection lever that is biased toward the paper discharge roller, the detection sensor that detects the movement of this detection lever, the path that guides the printing paper to the paper discharge roller, and the paper discharge roller. In a printer equipped with a paper ejection tray that stores printing paper ejected by a roller, the length from the rotation center of the detection lever to the tip of the detection lever is defined as the rotation center of the detection lever to the rotation center of the paper ejection roller. The discharge roller is placed between the center of rotation of the detection lever and the tip of the lever, and the detection sensor has the detection lever biased by its own weight or spring means. The first position where the detection lever is in a non-contact state with the print processing paper, and the detection lever is pushed up by the print processing paper by the conveyance of the print processing paper to the paper discharge roller and rotated. The position 2 can be detected.

[0009]

In the printer of the present invention configured as described above, the print processing paper passes through the discharge passage from the first position of the detection lever where there is no print processing paper in the discharge passage, and the leading end of the paper moves the detection lever. The detection sensor detects the rotation to the pushed up second position. Therefore, the printing paper passes through the paper discharge roller and is completely separated from the detection lever, and the detection lever returns to the state of the first position. At that point, it is detected that the print processing paper is completely discharged.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the printer of the present invention will be described below with reference to the accompanying drawings in which a paper discharge mechanism of a sublimation type thermal transfer type color video printer is attached.

FIG. 1 is a sectional view of the essential parts of the paper discharge mechanism of this embodiment, and FIG. 2 is an exploded perspective view of the essential parts of the paper discharge mechanism. Code 1
Is a shaft 1 rotated by a drive source such as a motor (not shown)
The paper discharge roller 2 supported by a is a pressing roller that rolls in pressure contact with the paper discharge roller 1. The pressing roller 2 is attached to a holder 5 having a shaft 4 supported by the printer body 3 as a rotation center. Discharge roller 1 by spring 6
Being pressed against.

Reference numeral 7 denotes a detection lever. The detection lever 7 is attached rotatably around a shaft 8 supported by the printer body 3, and the detection lever 7 is attached between the rear end portion and the printer body 3. The spring member 9 (or the weight of the detection lever 7 itself) may urge the discharge roller 1 side.

Further, the above-mentioned detection lever 7 has an opening 7
The detection sensor 10 formed of a, for example, a photocoupler or the like is formed in the opening 7a and supported by the printer main body 3.
Are arranged. The detection sensor 10 can shield the optical path by a shield plate 11 that rotates integrally with the rotation of the detection lever 7.

Reference numeral 12 is a paper discharge passage through which the print processing paper 13 is discharged, and 14 is a paper discharge tray for storing the print processing paper 13 discharged by the paper discharge roller 1.

The detection lever 7 will be described in more detail. The length of the detection lever 7 from the center of its shaft 8 to the tip portion 7b is from the rotation center of the detection lever 7 to the rotation center of the paper discharge roller 1. Therefore, the paper discharge roller 1 is located between the center of rotation of the detection lever 7 and the leading end portion 7b, the shaft 8 of the detection lever 7 is located on the passage 12 side, and the leading end portion 7b is located at the paper discharge tray 14. Located on the side.

Further, in the detection sensor 10, the detection lever 7 is in contact with the shaft 1a of the paper discharge roller 1 by the urging force of the spring member 9 and is in a non-contact state with the printing paper 13, that is, the detection lever. The position where the sensor 10 is not shielded by the shield plate 11 of 7 and the second position where the detection lever 7 is pushed up by the printing paper 13, that is, the position where the sensor 10 is shielded by the shield plate 11 of the detection lever 7. To detect.

Further, the above-mentioned detection lever 7 is located at a position crossing the paper discharge passage 12 or an extension line of the paper discharge passage 12 when it is not in contact with the printing paper 13.

Next, the operation of the paper discharge mechanism configured as described above will be described with reference to FIGS. 1 and 3 to 6.

First, FIG. 1 shows a state in which the leading end of the printing paper 13 in the paper discharge path 12 does not reach the paper discharge roller 1, the detection lever 7 does not rotate, and the sensor 10 is blocked by the shield plate 11. Not shielded. That is, the detection sensor 10 detects that the paper discharge roller 1 does not have the printing paper 13.

FIG. 3 shows a state in which the leading end of the print processing paper 13 has reached the paper discharge roller 1, whereby the detection lever 7 is pushed up by the print processing paper 13 rotating about the shaft 8 as a rotation center. , The detection sensor 10 by the shield plate 11
Is shielded, and it is detected that the print processing paper 13 is present on the discharge roller 1.

FIG. 4 shows a state immediately before the rear end of the printing paper 13 passes through the discharge roller 1. At this time, since the detection lever 7 is pushed up by the printing paper 13, the detection sensor 10 is detected. Still detects that the photographic printing paper 13 is on the discharge roller 1. After that, when the printing paper 13 is ejected to a position where it completely passes through the paper ejection roller 1 as shown by the broken line 13a, the detection lever 7 rotates to the position shown by the broken line, and the detection sensor 10 causes the shield plate 11 to move. Is released from the shielding by the printing paper 1 on the discharge roller 1.
It is possible to detect a state in which there is no 3.

FIG. 5 shows the warped printed paper 1 that has been discharged.
3 shows a state where 3 is accumulated in the discharge tray 14. At this time,
Since the detection lever 7 abuts the shaft 1a of the paper discharge roller 1 and completely blocks the paper discharge passage 12, even if the paper discharge roller 1 is reversed by the printing operation, the photographic processing paper 13 is discharged by the paper discharge roller 1
You won't get caught up in.

FIG. 6 shows a state in which a large amount of printing paper 13 is accumulated in the paper discharge tray 14. At this time, the uppermost print processing paper 13 contacts the tip portion 7b of the detection lever 7, the detection lever 7 is not completely closed, and the detection sensor 10 detects that the print processing paper 13 is present on the discharge roller 1. For detection, at this time, if the discharge roller 1 is arbitrarily rotated in the discharge direction and the detection lever 7 is not completely closed and the detection sensor 10 is still shielded by the shield plate 11, the discharge tray 14 It is detected that a large amount of the print processing paper 13 is accumulated in the sheet, and by discharging a new print processing paper, it is possible to detect that the print processing paper causes a jam in the printer.

As described above, in the paper discharge mechanism of the printer according to the present invention, the print processing paper 13 discharged from the paper discharge roller 1 is detected by the detection lever 7, and the rotation operation of the detection lever 7 is detected by the sensor 10. Since the presence or absence of the print-processed paper near the entrance / exit of the discharge roller 1 is detected by means of the above, it is possible to accurately detect the discharge state of the print-processed paper and eliminate the trouble of the discharge operation.

Further, since the front end portion 7a of the detection lever 7 is formed to be long on the exit side of the paper discharge roller 1, it is possible to detect that a large amount of the discharged print processing paper 13 is accumulated in the paper discharge tray 14. As a result, it is possible to eliminate the occurrence of a jam of the newly printed printing paper in the printer.

Further, when the detection lever 7 is not in contact with the print processing paper 13, it is closed at a position that crosses the paper discharge passage 12 or an extension line of the paper discharge passage 12, so that the print processing paper after the discharge processing is performed. It is possible to eliminate the problem of being caught in the discharge roller 1.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

[0028]

As described above, in the printer according to the present invention, the length from the rotation center of the detection lever to the tip of the detection lever is calculated from the distance from the rotation center of the detection lever to the rotation center of the paper discharge roller. Formed long, the discharge roller is placed between the center of rotation of the detection lever and the tip of the lever, and the detection sensor is biased by its own weight or spring means, and the detection lever is in non-contact with the printing paper. It is possible to detect the first position for detecting that the print processing paper is detected and the second position where the detection lever is pushed up by the print processing paper and is rotated by the conveyance of the print processing paper to the paper discharge roller. It is possible to detect from the state where the processed paper is in contact with the paper discharge roller to the state where it is completely separated from the paper discharge roller. As a result, the discharged state of the printed paper is accurately detected and the paper discharge operation is performed. It is possible to eliminate the trouble, the reliability of the printer is improved.

Further, since the leading end of the detection lever is formed to be long on the exit side of the paper discharge roller, it is possible to detect that a large amount of discharged print processing paper has accumulated in the paper discharge tray. There is an effect that the newly printed printing paper does not cause a jam in the printer.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a paper discharge mechanism of this example.

FIG. 2 is an exploded perspective view of a main part of a paper discharge mechanism of this example.

FIG. 3 is a cross-sectional view of a state in which the leading end of the printing paper is in contact with the paper discharge roller.

FIG. 4 is a cross-sectional view immediately before a print processing paper passes from a paper discharge roller.

FIG. 5 is a cross-sectional view of a state in which the print processing paper is completely discharged from the paper discharge roller.

FIG. 6 is a cross-sectional view of a state in which a large amount of print processing paper has accumulated in a paper discharge tray.

FIG. 7 is a cross-sectional view of a conventional paper discharge mechanism.

[Explanation of symbols]

 1 Paper Ejection Roller 1a Shaft 2 Pressing Roller 3 Printer Main Body 5 Holder 6 Spring 7 Detection Lever 7b Tip of Detection Lever 8 Shaft 9 Spring Member 10 Detection Sensor 11 Shielding Board 12 Paper Ejection Path 13 Printing Paper 14 Paper Ejection Tray

Claims (3)

[Claims] 1. A paper discharge roller that is driven to rotate to discharge print processing paper, a pressing roller that is pressed against the paper discharge roller and that nips and conveys the print processing paper, and is biased to the paper discharge roller side. A rotatable detection lever, a detection sensor for detecting the movement of the detection lever, a passage for guiding the print processing paper to the paper discharge roller, and a paper discharge for accumulating the print processed paper discharged by the paper discharge roller. In a printer equipped with a tray, the length from the rotation center of the detection lever to the tip of the detection lever is formed longer than the distance from the rotation center of the detection lever to the rotation center of the paper discharge roller. The paper discharge roller is arranged between the center of rotation of the lever and the tip of the lever, and the detection sensor has the detection lever biased by its own weight or spring means. A first position for detecting that the bar is in a non-contact state with the print processing paper, and a second position where the detection lever is pushed up by the print processing paper and is rotated by the conveyance of the print processing paper to the discharge roller. The position of the printer can be detected. 2. The printer according to claim 1, wherein when the print processing paper is not in the passage, the print processing paper accumulated in a paper discharge tray contacts the detection lever, and the detection lever is moved to the second position. A printer characterized in that the printer is rotated to. 3. The printer according to claim 1, wherein when the detection lever is in the first position, the tip of the detection lever is located at a position crossing the passage or the extension line of the passage.