JPH05193213A - Perfecting press - Google Patents

Abstract

PURPOSE:To obtain a perfecting press which can be reduced in installation space and paper feed path with the smaller number of paper feed rollers, feed direction change-over plates, and the like. CONSTITUTION:Paper printed on one surface thereof is discharged on a discharged paper receiver 3, which is provided on the upper surface of a body 1, through a first reversing path 6. By reversely rotating a paper supply/ discharge means 13, the paper on the discharged paper receiver 3 is returned onto the first reversing path 6. Furthermore, the paper is led onto a second reversing path 7 by a feed direction change-over plate 9 to be again supplied to the upstream of a paper feed path 5. The paper is printed on the other surface thereof. The perfected paper is discharged on the discharged paper receiver 3 through the first reversing path 6 by again rotating the paper supply/discharge means 13 forward. In addition, the discharged paper receiver 3 formed by using the upper surface of the body 1 also serves as a switchback path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided printing device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a paper in a paper feed cassette 4 provided at the bottom of a main body 20 of a printer is sent to a paper feed passage 5 by a paper feed roller 11, and the paper is fed. The paper which is supplied to the printing unit 2 by the roller 12 and is printed on one surface is discharged toward the paper discharge tray 21 provided on the side surface of the main body 20 by the paper feeding and discharging roller 13, and then the paper is discharged from the printing unit 2. When the sensor 14 detects the trailing edge of the sheet toward the tray 21, the sheet feeding / discharging roller 13 is rotated in the reverse direction, and the sheet is conveyed by the conveying direction switching plate 23 via the reversing passage 22 passing above the printing unit 2. There is a double-sided printing device in which the sheet is guided to the upstream side of the sheet, the sheet is conveyed again to the printing section 2 by the sheet conveying roller 12, and the printed sheet is conveyed toward the discharge tray 21. The conveyance direction switching plate 23 guides the paper from the paper ejection tray 21 to the reversal passage 22 while keeping the paper conveyance passage 5 closed due to its own weight. The pressure is used to rotate upward to open the sheet conveyance path 5.

Another conventional example will be described with reference to FIGS. Here, parts having the same structure as the parts described in FIG. 4 will be described using the same reference numerals. In the example shown in FIGS. 5 and 6, as shown in FIG. 5, the paper in the paper feeding cassette 4 mounted on the side surface of the main body 20 of the printing apparatus is fed to the paper feeding passage 5 by the paper feeding roller 11, and the paper is fed. The paper, which is supplied to the printing unit 2 by the paper carrying roller 12 and printed on one surface, is carried by the carrying direction switching plate 24 to the main body 20.
The sheet is guided to the sheet receiving tray 3 on the upper surface of the sheet and is discharged by the sheet discharging roller 25. At the time of double-sided printing, the conveying direction switching plate 24 is rotated by the solenoid 26 as shown in FIG. The paper sent from the printing unit 2 is guided to the reversing passage 27 that curves downward, and the paper guided to the reversing passage 27 is guided to the switchback passage 28 by the paper conveying roller 12 and the paper feeding / discharging roller 13, and the paper When the sensor 14 detects the end portion, the paper feeding / discharging roller 13 is reversed to guide the paper to the upstream side of the paper carrying passage 5 by the carrying direction switching plate 23, and the printing unit 2 prints on the back surface of the paper. There is a double-sided printing device in which a sheet printed by the transport direction switching plate 24 rotated downward by the return operation of the solenoid 26 is discharged to the upper sheet discharge tray 3. In this example, the transport direction switching plate 23 is rotated by its own weight to maintain the state in which the paper in the switchback passage 28 is guided to the upstream side of the paper transport passage 5, but from the reversing passage 27 to the switchback passage 28. It rotates upward due to the pressure of the sheet of paper that is advancing, and allows passage of the sheet of paper.

In the example shown in FIG. 7, when printing on one side,
Paper feed cassette 4 provided at the bottom of the main body 20 of the printing apparatus
The paper inside is sent out to the paper conveyance path 5 by the paper feed roller 11, the paper is supplied to the printing unit 2 by the paper conveyance roller 12, and the paper on one side of which is conveyed by the conveyance direction switching plate 2
The sheet is discharged to the sheet discharge tray 21 on the side surface of the main body 20 by the sheet discharge roller 25 while being guided by 9, and when performing double-sided printing,
The paper sent from the printing unit 2 is guided to the reversing passage 30 passing above the printing unit 2 by the conveying direction switching plate 29, and the paper guided to the reversing passage 30 is sent to the switchback passage 28 by the paper conveying rollers 12 to convey the paper. When the sensor 14 detects the rear end, the paper feeding / discharging roller 13 is reversed, and the paper is guided to the upstream side of the paper carrying path 5 by the carrying direction switching plate 9.
There is a double-sided printing device that prints on the back surface of a sheet in the process of transporting the sheet through the printing unit 2 toward the discharge tray 21 again. In this example, one transport direction switching plate 2
9 is driven by a solenoid. The other transport direction switching plate 9 is rotated counterclockwise about the support shaft 10 by the weight 8 and abuts against a stopper (not shown) to be stationary.
The paper in the switchback passage 28 is maintained in a state of being guided to the paper transport passage 5, but the paper pressure from the reversing passage 30 toward the switchback passage 28 causes the paper to rotate horizontally to allow passage of the paper. is there.

[0005]

In the case of double-sided printing as shown in FIG. 4, a discharge tray 21 must be provided on the side surface of the main body 20 in order to return the printed paper to the reversing path 22. The installation space of the main body 20 must be widened. Also, the ones shown in FIGS. 5 and 6 are
A switchback passage 28 must be provided on the side surface of the main body 20 in order to return the printed sheet to the reverse path 27. Similarly, in the structure shown in FIG. 7, a switchback passage 28 is provided on one side of the main body 20 in order to return the printed paper to the upstream side of the paper conveyance passage 5, and the paper is also discharged to the other side of the main body 20. Since the paper tray 21 has to be provided, the installation space of the main body 20 becomes wider. Further, as shown in FIGS. 5 to 7, when the switchback passage 28 is provided separately from the paper discharge tray 3 and the paper discharge tray 21, the paper conveyance path becomes complicated, and therefore the paper is conveyed. There is a problem in that the number of rollers and the transfer direction switching plate increase and the cost increases. Further, although not shown, there is one in which an intermediate tray for reversing and storing paper for double-sided printing is provided inside the main body of the printing apparatus. Since it exists inside the main body, cleaning is troublesome.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a main body in which a printing section is built-in and a paper discharge receiver is formed on an upper surface thereof, a sheet conveying path which is connected to a sheet feeding section and passes through the printing section, and this sheet. A first reversing passage that is curved upward from the downstream side of the conveying passage toward the paper ejection receiver, and a tangential branch that extends downward from the middle of the first reversing passage and passes under the printing unit. A second reversing passage curved upward and joined to the upstream side of the sheet conveying passage, and a conveyance rotatably provided in a branch passage between the first reversing passage and the second reversing passage. A direction switching plate, a sheet transporting unit disposed in the sheet transporting path and the second reversing path, and a sheet receiving unit provided in the first reversing path and the transporting direction switching plate. It is composed of a paper feeding / discharging means that can rotate in the normal and reverse directions.

[0007]

Operation: Paper is supplied from the paper feed section to the printing section through the paper conveyance path, and the printed paper is passed through the first reversing path and guided to the paper ejection receiver on the upper surface of the main body by the conveyance direction switching plate. The sheet is discharged by the sheet discharging means, the sheet is received and returned to the first reversing path by reversing the sheet feeding / discharging means, and is further guided to the second reversing path by the conveying direction switching plate, and is again conveyed to the sheet conveying path. By supplying the paper to the upstream side of the paper, printing can be performed on the surface on the opposite side of the paper in the printing unit, and by again rotating the paper feeding / discharging means in the forward direction, the paper printed on both sides can be conveyed by the conveying direction switching means. The sheet can be discharged to the sheet receiving tray via the first reversing passage while being guided. Further, since the paper discharge tray is formed by using the upper surface of the main body and the paper discharge tray can be used as a switchback passage in double-sided printing, the installation space of the main body can be reduced, and further It is possible to reduce the number of paper conveyance paths, and accordingly, it is possible to reduce the number of rollers for conveying the paper and the number of conveyance direction switching plates to reduce the cost.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. Portions having the same structure as the portions described in FIGS. 4 to 7 will be described using the same reference numerals. Reference numeral 1 denotes a main body of a printing apparatus. The main body 1 has a printing unit 2 built-in, a paper discharge receiver 3 is formed on the upper surface of the main body 1, and a paper feeding cassette 4 as a paper feeding unit is provided on a side surface of the main body 1. It is detachably attached. Further, in the main body 1, a sheet conveying path 5 that starts from the tip of the sheet feeding cassette 4 and passes through the printing section 2, and curves upward from the downstream side of the sheet conveying path 5 toward the sheet receiving tray 3. The first reversing passage 6 and the first reversing passage 6 are branched tangentially downward from the middle of the first reversing passage 6 and pass under the printing unit 2 and are curved upward and upstream of the sheet conveying passage 5. And a second reversing passage 7 joined to the side. A transport direction switching plate 9 having a weight 8 at the lower end is provided in a branch path between the first reversing passage 6 and the second reversing passage 7 so as to be rotatable about a support shaft 10. Further, a paper feed roller 11 and a paper feed roller 12 which are paper feed means are provided in the paper feed path 5, respectively.
The second reversing passage 7 is provided with a paper conveying roller 12 which is a paper conveying means, and the first reversing passage 6 is provided with a paper feeding roller 12 between the paper ejection receiver 3 and the conveyance direction switching plate 9. A sheet feeding / discharging roller 13 is provided. The paper feed roller 11 is a motor that rotates in one direction (not shown).
Is connected via a clutch (not shown), and the clutch operates to make one rotation and stand still. The paper carrying roller 12 is driven by the above-mentioned motor to rotate in one direction. Further, the paper feeding / discharging roller 13 is connected to a motor (not shown) capable of rotating in the normal and reverse directions. Further, a sensor 14 that optically detects a sheet is provided between the conveyance direction switching plate 9 and the sheet feeding / discharging roller 13 in the first inversion path 6.

In such a structure, the paper feed cassette 4
The sheet inside is sent out to the sheet conveying path 5 by the sheet feeding roller 11, and is further printed by the printing unit 2 in the process of being sent to the first reversing passage 6 by the sheet conveying roller 12. The conveying direction switching plate 9 is normally maintained in a vertical posture by the gravity of the weight 8. In this state, the intermediate portion of the first reversing passage 6 is closed by the conveying direction switching plate 9 as shown in FIG. However, as shown in FIG. 2B, the conveyance direction switching plate 9 is rotated counterclockwise by the pressure received from the front end of the sheet 15 to allow the sheet 15 to pass therethrough. As a result, the printed paper 15 is guided to the paper discharge tray 3 on the upper surface of the main body 1.

In order to print on the opposite surface of the paper 15, as shown in FIG. 2 (c), the paper 15 on which one side is printed is guided to the paper discharge tray 3 and the rear end of the paper 15 is printed. When is detected by the sensor 14, the detection signal of the sensor 14 causes the motor to reverse and the paper feeding and discharging roller 13 to reverse. As a result, the paper 15 in the paper discharge receiver 3 is returned to the first reversal path 6, and as shown in FIG. Be led to. At this time, when the sensor 14 detects the passage of the paper 15, the motor driving the paper supply / discharge roller 13 is stopped by the detection signal. This is the state shown in FIG. Subsequently, the paper 15 is supplied to the upstream side of the paper transport passage 5 again by the paper transport roller 12 provided in the second reversing passage 7, and the printing unit 2 is provided by the paper transport roller 12 provided in the paper transport passage 5. Is supplied to and printed. Then, by again rotating the paper feeding / discharging roller 13 in the normal direction,
The paper 15 printed on both sides is discharged to the paper receiver 3 through the first reversing passage 6 while being guided by the conveyance direction switching plate 9. This is the state shown in FIG.

As described above, since the paper discharge receiver 3 is formed by utilizing the upper surface of the main body 1, and the paper discharge receiver 3 can be used as a switchback passage in double-sided printing, the main body 1 can be installed. It is possible to reduce the space, and further, it is possible to reduce the number of conveyance paths for the sheet 15, and accordingly, it is possible to reduce the number of rollers for conveying the sheet 15 and the number of conveyance direction switching plates. Further, since the transport direction switching plate 9 can be rotated by the pressure of the paper 15 and returned by the weight of the weight 8, the power source for driving the paper discharge direction switching plate 9 can be omitted. Therefore, the cost can be more effectively reduced.
Further, since it is not necessary to provide an intermediate tray for reversing and stocking paper for double-sided printing at the bottom of the main body 1,
The trouble of cleaning the intermediate tray can be eliminated.

Next, a second embodiment of the present invention will be described with reference to FIG. According to the present invention, the paper feed cassette 4 is attached to the bottom of the main body 1 and the paper feed cassette 4 is inserted in the paper feed passage 5.
It is curved toward the tip of the. The other structures and operations are the same as those in the first embodiment, and will be omitted.

[0013]

According to the present invention, a main body having a built-in printing unit and a paper discharge receiver formed on the upper surface, a paper transport passage connected to the paper feed unit and passing through the printing unit, and a downstream of the paper transport passage. A first reversing passage that is curved upward from the side toward the sheet receiving tray, and is branched tangentially downward from the middle of the first reversing passage to pass upward under the printing unit. A second reversing passage that is curved and merges on the upstream side of the sheet conveying passage; and a conveyance direction switching plate that is rotatably provided in a branch passage between the first reversing passage and the second reversing passage. ,
A sheet conveying means arranged in the sheet conveying passage and the second reversing passage, and a forward / reverse rotatable member provided between the paper receiving tray and the conveying direction switching plate in the first reversing passage. Since it is configured by the paper feeding / discharging means, the paper is supplied from the paper feeding unit to the printing unit through the paper transport passage, the printed paper is passed through the first reversing passage, and the transport direction switching plate is provided on the upper surface of the main body. Leads to the paper receiving tray and ejects paper by the paper feeding and ejecting means,
By reversing the paper feeding / discharging means, the paper in the paper receiving tray is returned to the first reversing path, and further guided to the second reversing passage by the conveying direction switching plate and supplied again to the upstream side of the paper conveying passage. The printing unit can print on the opposite side of the sheet, and the sheet is printed on both sides again by rotating the sheet feeding / discharging unit in the forward direction while guiding the sheet with the conveyance direction switching unit. It is possible to discharge the sheet to the sheet receiving tray via the paper, and the sheet receiving tray is formed using the upper surface of the main body, and the sheet receiving tray can be used as a switchback passage in double-sided printing. Therefore, it is possible to reduce the installation space of the main body, and further, it is possible to reduce the number of paper conveyance paths, which in turn reduces the number of rollers for conveying the paper and the number of conveyance direction switching plates to reduce costs. Figure It has an effect such as can.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a partial front view showing a reversing operation of a sheet with time.

FIG. 3 is a front view showing a second embodiment of the present invention.

FIG. 4 is a front view showing a conventional example.

FIG. 5 is a front view showing a discharged state in another example of the related art.

FIG. 6 is a front view showing a double-sided printing state of a printed sheet.

FIG. 7 is a front view showing a third conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Printing part 3 Paper receiving part 4 Paper feeding part 5 Paper conveying path 6 First reversing path 7 Second reversing path 9 Conveying direction switching plates 11, 12 Paper conveying means 13 Paper feeding and discharging means

Claims (1)

[Claims] 1. A main body in which a printing unit is built-in and a paper ejection receiver is formed on an upper surface, a paper transport passage which is connected to a paper feeding unit and passes through the printing unit, and the paper ejection passage from the downstream side of the paper transport passage. A first reversing passage curved upward toward the paper receiver,
A second reversing passage that is tangentially branched downward from the middle of the first reversing passage, curved below the printing portion, and curved upward, and joined to the upstream side of the sheet conveying passage; A conveyance direction switching plate rotatably provided in a branch path between the first reversing passage and the second reversing passage, and a sheet conveying means arranged in the paper conveying passage and the second reversing passage. A double-sided printing device, comprising: a paper feeding / discharging means that is provided between the paper receiving tray and the transport direction switching plate in the first reversing passage and is capable of rotating in the normal and reverse directions.