JPH10109447A - Perfecting-printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perfecting-printing device in which operability of jamming release is good. SOLUTION: The perfecting-printing device is equipped with a sheet cassette 2 capable of housing sheets 3 from the operation face side, with a first conveyance path 5 which takes out the sheet 3 from the sheet cassette 2 and conveys it to a process unit 4 and a transfer part 13 and furthermore a fixing device 14 and with a sheet reversing mechanism 6 having a conveyance direction changeover plate 11. The conveyance direction changeover plate 11 reverses the conveyance direction of the form 3 printed on the front surface through the process unit 4 and the transfer part 13 and furthermore the fixing device 14 and is positioned on the downstream side of the first conveyance path 5 and reverses the conveyance direction just before conducting the sheet 3 conveyed from the first conveyance path 5 to a delivery receiver 10 and conducts the sheet 3 to a second conveyance path 7. Furthermore, the both sides-printing device is equipped with the second conveyance path 7 which conveys the sheet 3 from the sheet reversing mechanism 6 to the upstream side of the first conveyance path 5 and with a sheet conveying mechanism 9. The sheet conveying mechanism 9 is incorporated with the first conveyance path 5, the sheet reversing mechanism 6 and the second conveyance path 7 to take out a jamming sheet from the operation face side and is turned around the prescribed rotation shaft 8 to the operation face side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-sided printing apparatus, and more particularly to a two-sided printing apparatus having a good jam resolving property.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a diagram showing a configuration of a conventional double-sided printing apparatus of this type, which is disclosed in Japanese Patent Application Laid-Open Publication No. H10-209,004. Referring to FIG. 2, this conventional double-sided printing apparatus includes a main body 21 having a built-in printing unit 22 and a discharge tray 23 formed on an upper surface, and a paper transporting unit connected to a paper feeding unit 24 and passing through the printing unit 22. A passage 25, a first reversing passage 26 curved upward from the downstream side of the sheet transporting passage 25 toward the paper discharge receiver 23, and a tangential direction from the middle of the first reversing passage 26 downward. A second reversing passage 27 which is branched and curved upward under the printing unit 22 and joined to the upstream side of the paper conveying passage 25;
A transfer direction switching plate 29 rotatably provided around a support shaft 30 and having a weight 28 at a lower end thereof, and a paper transfer passage 25 and a second reverse passage 27 are provided on a branch path between the first and second reverse passages 6 and 27. Paper feeding means 31 and 32 provided; a paper feeding / discharging means 33 provided between the paper receiving tray 23 and the transport direction switching plate 29 in the first reversing passage 26; It comprises an optical sensor 34 for sheet detection provided between the plate 29 and the sheet supply / discharge means 33.

[0003] Paper is supplied from a paper supply unit 24 to a printing unit 22 via a paper conveyance path 25, and the printed paper is passed through a first reversing path 26 and a main body 21 is conveyed by a conveyance direction switching plate 29.
The sheet is guided to the paper discharge tray 23 on the upper surface of the paper tray, discharged by the paper supply / discharge means 33, and the paper in the paper discharge tray 23 is returned to the first reversing path 26 by reversing the paper supply / discharge means 33. By being guided to the second reversing path 27 by the switching plate 29 and supplied to the upstream side of the sheet transport path 25 again, printing can be performed on the surface on the opposite side of the sheet by the printing unit 22, and the sheet supply / discharge again By rotating the means 33 in the normal direction, the sheet on which double-side printing has been performed can be discharged to the discharge tray 23 via the first reversing path 26 while being guided by the transport direction switching plate 29.

Further, the paper discharge tray 23 is formed by using the upper surface of the main body 21, and the discharge tray 23 can be used as a switchback passage for double-sided printing. It is possible to reduce the number of rollers and transport direction switching plates for transporting the sheet, thereby reducing the cost.

[0005]

A problem with this conventional double-sided printing apparatus is that the operability of clearing the jam is poor. The reason is that the sheet feeding unit and the sheet conveying unit are located on the opposite side to the operation surface of the apparatus. Therefore, when a paper jam occurs, it has been necessary to pull out the entire paper traveling path portion from the apparatus or to go around the back side of the apparatus to perform the jam clearing process.

It is an object of the present invention to provide a two-sided printing apparatus having good operability for clearing a jam.

[0007]

According to the present invention, there is provided a double-sided printing apparatus comprising: a paper supply unit capable of storing paper from an operation surface side; a first transport path for taking out paper from the paper supply unit and transporting the paper to a printing unit; A sheet reversing mechanism located downstream of the first conveyance path for reversing the conveyance direction of the sheet printed on the front surface by the printing unit, and the sheet from the sheet reversing mechanism to the upstream of the first conveyance path. A second transport path for transporting the jammed sheet, the first transport path, the sheet reversing mechanism, and the second transport path are incorporated around the predetermined rotation axis in order to take out the jammed paper from the operation surface side. A paper transport mechanism that rotates toward the operation surface.

Further, in the double-sided printing apparatus according to the present invention, the conveyance direction is reversed just before the paper conveyed from the first conveyance path is led out to the paper receiving tray, and the sheet is guided to the second conveyance path. The paper reversing mechanism having a switching plate is provided.

Further, the double-sided printing apparatus of the present invention provides
The printing unit includes an electrophotographic printing mechanism including a process unit including an exposure and development process and a transfer unit and a fixing unit.

[0010] Further, the double-sided printing apparatus of the present invention includes the above-mentioned printing unit comprising an impact printing mechanism.

Further, the double-sided printing apparatus according to the present invention includes the above-mentioned printing unit comprising an ink-jet printing mechanism.

Further, the double-sided printing apparatus of the present invention is provided with the above-mentioned printing section comprising a thermal transfer printing mechanism.

[0013]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of the present invention. Referring to FIG. 1, the duplex printing apparatus according to the present embodiment includes a paper cassette 2 which is a paper feeding unit capable of storing paper 3 from the operation surface side indicated by an arrow 16, and takes out the paper 3 from the paper cassette 2 to perform printing. Process unit 4
And a first transport path 5 for transporting the transfer unit 13 to the fixing unit 14 and a first transport path for reversing the transport direction of the paper 3 printed on the surface by the process unit 4, the transfer unit 13, and the fixing unit 14. 5 having a transport direction switching plate 11 for reversing the transport direction and leading to the second transport path 7 immediately before leading the paper 3 transported from the first transport path 5 to the discharge tray 10 and located downstream of the first transport path 5 A reversing mechanism 6, a second conveying path 7 for conveying the sheet 3 from the sheet reversing mechanism 6 to an upstream of the first conveying path 5, and a first conveying path 5 for removing jammed paper from the operation surface side. It comprises a sheet transport mechanism 9 which incorporates the reversing mechanism 6 and the second transport path 7 and rotates on the operation surface side about a predetermined rotary shaft 8.

The paper cassette 2 is pulled out to the front of the main body 1 in the direction of the arrow 16, and the paper 3 is stored in the paper cassette 2. The sheet 3 is fed in the direction of arrow 17, the toner image formed by the process unit 4 is transferred by the transfer unit 13 via the first transport path 5, and the toner image is fixed by the fixing unit 14. This prints on the surface.
Further, the sheet 3 sent in the direction of the arrow 18 passes through the sheet reversing mechanism 6 and stops immediately before the end of the sheet 3 passes through the sheet reversing roller 12. Along the direction of the arrow 19.
Then, the sheet 3 is drawn by an arrow 16 that pulls out the sheet cassette 2
It is sent in the direction of arrow 20 via the second conveyance path 7 formed on the front side of the main body 1 as the direction. After that, paper 3
The toner image formed by the process unit 4 is transferred again by the transfer unit 13 via the first transport path 5 and is fixed by the fixing unit 14 so that the toner image is printed on the back surface.
Further, it is sent in the direction of arrow 18 and discharged out of the main body 1,
The paper is discharged to the paper discharge receiver 10.

In the double-sided printing apparatus of this embodiment, paper 3
If the paper jams in the paper traveling path of the paper transport mechanism 9, it is necessary to remove the paper 3 in the paper traveling path for jam clearance processing. In this case, open the jam release cover 15 on the front of the apparatus. Then, the sheet transport mechanism 9 is opened toward the operation surface with the rotation shaft 8 as a center, and the jammed sheet 3 is removed.

Although the printing section of the above-described embodiment has shown the form of the electrophotographic printing mechanism, the impact printing mechanism,
An inkjet printing mechanism or a thermal transfer printing mechanism may be used.

[0018]

The effect of the present invention is that the operability of clearing the jam is good. The reason is that the paper feeding unit and the paper transport mechanism can be operated from the operation surface side of the apparatus. Therefore, if a paper jam occurs, the paper transport mechanism can be opened to the operation surface around the rotation axis to remove the jammed paper, and the paper can be pulled out of the device along with the travel path, or jammed around the back of the device. There is no need to perform release processing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Main body 2 Paper cassette 3 Paper 4 Process unit 5 First transport path 6 Paper reversing mechanism 7 Second transport path 8 Rotating shaft 9 Paper transport mechanism 10 Discharge receiver 11 Transport direction switching plate 12 Paper reversing roller 13 Transfer device 14 Fixing unit 15 Jam release cover 16, 17, 18, 19, 20 Arrow

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G03G 15/00 526 B41J 3/00 S

Claims (6)

[Claims] A paper feed unit capable of storing paper from an operation surface side; a first transport path for taking out paper from the paper feed unit and transporting the paper to a printing unit; A sheet reversing mechanism located downstream of the first conveying path for reversing the conveying direction of the sheet, and a second conveying path for conveying the sheet from the sheet reversing mechanism to the upstream of the first conveying path,
A paper transport that incorporates the first transport path, the paper reversing mechanism, and the second transport path to take out jammed paper from the operation surface side and rotates toward the operation surface side about a predetermined rotation axis. A double-sided printing apparatus comprising a mechanism. 2. A sheet reversing mechanism having a conveyance direction switching plate for reversing the conveyance direction immediately before drawing out the sheet conveyed from the first conveyance path to a discharge tray and leading the sheet to the second conveyance path. The double-sided printing apparatus according to claim 1, further comprising: 3. The double-sided printing apparatus according to claim 1, further comprising the printing unit including an electrophotographic printing mechanism including a process unit including a charging, exposing, and developing process, and a transfer unit and a fixing unit. 4. The double-sided printing apparatus according to claim 1, further comprising the printing unit including an impact printing mechanism. 5. The double-sided printing apparatus according to claim 1, further comprising the printing unit including an inkjet printing mechanism. 6. The double-sided printing apparatus according to claim 1, further comprising the printing unit including a thermal transfer printing mechanism.