JP2000063022A - Perfecting press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perfecting press which quickens the speed of printing on both sides of the paper, which can be miniaturized, which prevents the printing paper sheet from being touched or stained, and which prevents the quality of printing from being lowered. SOLUTION: In this perfecting press 1, an auxiliary carrying route 11 is juxtaposed with a main carrying route 4. The machine 1 is provided with a switching means 10, which switches the carrying route of a printing paper sheet P from the main carrying route 4 to the auxiliary carrying route 11 and a paper sheet reversing means 12 having a paper sheet storing body 13 with an area capable of storing the printing paper sheet P temporarily. The printing paper sheet storing body 13 is of a cylindrical shape having a curved surface.

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 apparatus, and more particularly to a double-sided printing apparatus having a mechanism for reversing the front and back sides of paper.

[0002]

2. Description of the Related Art In order to print on both sides of a printing sheet, it is necessary to reverse the sheet after printing on one side of the sheet.

FIG. 6 shows a typical conventional technique. The printing paper supplied from the paper feed roller 103 passes between the photoconductor 105 and the transfer roller 106 to form an image, and the fixing unit 107 completes printing. In the case of printing on only one side, the gate 120 moves in the direction of arrow a,
As it is, it is guided to the discharge roller 109 and discharged.

On the other hand, when double-sided printing is required, the printing paper passes through the gate 120 and then is temporarily discharged from the paper discharge roller 1.
09, and then the printing paper is sent to the sensor unit 11
According to the detection of 6, the sheet is returned again and is guided to the sub-transport path 111. At this time, the gate 120 moves in the direction of arrow b.

Specifically, a technique is disclosed in which a sheet is sent out through a switching gate to a planar plate connected to the main transport path 104 in which the printing means 108 is arranged, and the sheet is inverted by redrawing the sheet. (Japanese Patent Laid-Open No. 10-
6588).

[0006]

However, when the sheet reversing means is connected to the main conveyance path, the printing means cannot be used while the sheet reversing means is in operation.
Since there is a printing interval, the printing speed of the entire device is reduced, and the printing efficiency is reduced.

Further, when a flat plate is used as the paper reversing means, it is necessary to match this plate with the size of the printing paper to be placed flat on it, which makes it difficult to downsize the entire apparatus. .

On the other hand, when the plate portion is taken out of the apparatus to reduce the size, there is a disadvantage that the user mistakenly removes the printing paper waiting for the back side printing.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the inconvenience of the conventional example, improve the efficiency of printing processing including double-sided printing processing, and provide a small-sized double-sided printing apparatus.

[0010]

In order to achieve the above object, a double-sided printing device according to the invention of claim 1 is a paper hopper for storing printing paper, and a paper feeding means for feeding the printing paper from the paper hopper. A main conveyance path for guiding the fed-out printing paper in a predetermined direction, a printing unit arranged in the middle of the main conveyance path, and a sub-conveyance path adjoining the main conveyance path to join the main conveyance path. Is provided between the main conveyance path and the sub-conveyance path, and on the downstream side of the main conveyance path, a switch for switching the conveyance direction of the printing paper sent from the main conveyance path to the sub-conveyance path. A member is arranged, and further, a paper reversing means for reversing the front and back of the printing paper is arranged on the sub-conveyance path.

With this configuration, the invention described in claim 1 prints one side of the printing paper fed from the paper hopper by the printing means, and if printing only one side, the paper is ejected through the paper ejection roller. On the other hand, when performing double-sided printing, after completion of single-sided printing, the switching member operates to feed the paper to the sub-conveyance path. Printing is done. That is, in the case of single-sided printing, the main conveyance path is passed once, and in the case of double-sided printing, the main conveyance path is passed twice.

Here, the main transport path is a path including the printing means from the paper feeding means to the paper discharging roller or the switching member,
The sub-conveyance path is a path including a sheet reversing means from the switching member to the confluence point with the main conveyance path. The sub-conveyance path is provided adjacent to the main conveyance path and is connected to the switching member at the confluence point after the reversal of printing paper. .

The switching member between the main transport path and the sub transport path is a member for switching from the main transport path to the sub transport path. In the present invention, this switching member is provided between the main transport path and the sub transport path and on the downstream side of the main transport path where printing is completed.

In the present invention, the paper reversing means for reversing the printing paper is provided on the sub-conveying path without being connected to the main conveying path. Therefore, even when the paper reversing means is operating, it is on the main conveying path. The printing means in can be activated.

According to the second aspect of the present invention, the sheet reversing means switches and guides the printing sheet container for temporarily storing the printing sheet and the accommodation and discharge of the printing sheet in the printing sheet container. A guide mechanism provided side by side on the outer circumference of the printing paper container, and a reversing roller for reversing the printing paper by switching the rotation direction according to the housing and ejection,
A drive unit for driving the reversing roller and a drive control unit for controlling the driving unit are provided together.

According to this structure, the printing paper sent to the sub-conveyance path is guided to the printing paper container by the guide mechanism and accommodated in the printing paper container by the rotation of the reversing roller. When the storage is completed, the reversing roller rotates in the opposite direction to the storage and the printing paper is ejected from the printing paper storage body, and the guide mechanism again ensures that it is in the sub-conveyance path toward the confluence with the main conveyance path. Be guided.

Therefore, the same effect as that of the first aspect of the invention can be obtained, and the printing paper can be reliably inverted.

Here, the printing paper container has an area inside which the printing paper is temporarily stored in order to reverse the printing paper.

A guide mechanism provided on the outer periphery of the printing paper storage body guides the printing paper storage body by switching between storage and discharge of the printing paper storage body. The guide mechanism is arranged on the outer periphery of the print sheet container near the opening into which the print sheet enters, and guides the print sheet into the print sheet container when the print sheet is sent to the sheet reversing unit to guide the print sheet. When discharged, the print sheet in the print sheet container is guided in the direction of the sub-conveyance path toward the confluence with the main conveyance path.

The reversing roller changes the rotation direction in accordance with the accommodation and the ejection, winds the printing paper into the printing paper accommodation body and accommodates it, and winds it up from the printing paper accommodation body and ejects it. The reversing roller may be composed of one roller and a pressing member. Further, in order to suppress the friction given to the printing paper, it is preferable that the reversing roller is composed of a pair of rollers.

The drive controller controls the movements of the guide mechanism and the sheet reversing means reversing roller. The drive control unit senses the start or the completion of storage of the print sheet into the print sheet container, and operates the drive unit that drives the reversing roller to control the rotation direction of the reversing roller.

According to the third aspect of the invention, the printing paper container is formed so as to have a curved surface along the insertion direction of the printing paper. As a result, the print sheet is smoothly fed into the storage area inside the print sheet storage body along the curved surface thereof, and the print sheet is inverted in a bent state, whereby the sheet reversing unit can be made small.

The curvature, arrangement, etc. of this curved surface are appropriately determined in consideration of the relation of arrangement with other constituent elements in part or in whole. It is necessary to change the traveling direction of the printing paper when the paper is stored in or discharged from the printing paper container having a storage area inside. Therefore, it is particularly preferable to form a curved surface near the opening of the printing paper container. desirable.

According to the fourth aspect of the invention, the printing paper container is formed in a substantially cylindrical shape. The same as the invention according to claim 3, wherein the entire printing paper container is formed into a curved surface, so that the printing paper can be smoothly stored in the printing paper container and discharged from the printing paper container. In addition to the effect, the paper reversing means can be made smaller. The cylindrical shape may have a circular cross section, an elliptical cross section, or a shape close to these.

According to the fifth aspect of the invention, the shape of the printing paper container is formed so that the outer circumference becomes gradually smaller along the outer circumference thereof, that is, the cross section has a spiral shape. In order to form such a printing paper container, the plate may be formed so as to be rolled up, and a small roller may be arranged along the spirally shaped cross section.

As a result, the storage and discharge of the print sheet in the print sheet container is guided, the resistance of the conveyed print sheet is further reduced, and the volume of the print sheet container can be further reduced.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a double-sided printing device 1 showing one embodiment of the present invention. This double-sided printing device 1
Includes a paper hopper 2 for storing the printing paper P, a paper feed roller 3 for feeding the printing paper P from the paper hopper 2, and a printing paper P for guiding the fed printing paper P toward the printing means 8. A main transport path 4 that transports P and a sub-transport path 11 that is attached to the main transport path 4 are provided.

In this embodiment, the sub-transport route 11 is provided in parallel with the main transport route 4 and joins upstream of the main transport route. Then, the main transport path 4 and the sub transport path 11
And the downstream side of the main transport path 4, that is, between the printing unit 8 and the paper discharge roller 9, the transport direction of the print paper P sent from the main transport path 4 is the sub transport path 11. A switching member 10 for switching to is arranged.

In the double-sided printing apparatus 1, the sheet reversing means 12 for reversing the front and back sides of the printing sheet P is arranged in the sub-conveyance path 11 beyond the switching member 10, and as shown in FIG. It is provided at a corner portion connected to the sub-transport path 11 arranged in parallel. This enables downsizing of the double-sided printing device 1. Further, the main conveyance path 4 and the sub-conveyance path 11 are arranged substantially parallel to each other, and the sheet reversing means 12 on the sub-conveyance path 11 is not connected to the main conveyance path 4 and therefore the main conveyance path 4 is provided. The operation of the upper printing unit is not affected by the operation of the sheet reversing unit 12 on the sub transport path 11.

Each component will be described.

The paper hopper 2 stores the print paper P, and the paper feed roller 3 supplies the print paper P from the paper hopper 2 to the main transport path 4 one by one according to the print command. A printing unit 8 is provided on the main transport path 4. This printing means 8
Is provided with a photoconductor 5 that forms a latent image, a transfer roller 6 that transfers the development based on the latent image, and a fixing roller 7 that fixes the development on the printing paper P. Is printed.

After completion of printing, in the case of single-sided printing, the sheet is discharged as it is through the sheet discharging roller 9, and in the case of double-sided printing, the path is switched by the switching member 10 and sent to the sub-conveyance path 11. The printing paper P sent to the sub transport path 11 joins the main transport path 4 again for printing on the back side. Therefore, in the case of single-sided printing, it passes once through the main transport path 4, and in the case of double-sided printing, it is guided to the main transport roller 4 again and passes through the main transport path 4 twice.

The switching member 10 is a member for switching the connection between the main transport path 4 and the sub transport path 11. Switching member 10
Is between the fixing device 7 and the paper discharge roller 9, and the main conveyance path 4
It is arranged in front of the branch point between the sub-transport route 11 and the sub-transport route 11.
The switching member 10 is rotatably provided, and is connected to the main conveyance path 4 or the sub-conveyance path 11 depending on the direction of the teeth when rotated, and switches the conveyance direction of the printing paper P.

The sheet reversing means 12 reverses the front and back sides of the one-side printed printing sheet sent to the sub-conveyance path 11 by the switching member 10. The sheet reversing means 12 is provided on the sub-transporting path 11 and is not connected to the main transporting path 4, so that it does not affect the operation of the printing means 8 on the main transporting path 4. .

That is, in double-sided printing, when the printing on one side is completed and the printing paper P is fed to the paper reversing means 12, the main transport path 4 can start the next printing, so that the printing means can be efficiently used. 8 can be used, and the speed of the printing process including the double-sided printing process can be increased to improve the printing efficiency.

FIG. 2 is a perspective view showing one form of the paper reversing means 12 shown in FIG.

The paper reversing means 12 is arranged in parallel on the outer periphery of the printing paper container 13 for temporarily containing the printing paper P, and guides the printing paper P by accommodating and discharging it. It is provided with a guide mechanism 14 and a pair of reversing rollers 15 for reversing the printing paper by switching the rotation direction according to the accommodation and ejection.

The printing paper container 13 shown in FIG. 2 has a cylindrical outer shape, and has a shape in which a plate-shaped plate is rolled up.
In other words, it is formed along the outer circumference of the printing paper container 13 such that its circumference is gradually reduced, that is, its cross section is spiral.

By adopting such a printing paper container 13 having a spiral cross section, the printing paper P contained in the printing paper container 13 can be accommodated and discharged smoothly and reliably. With such a shape, it is possible to reduce the size of the double-sided printing apparatus 1 as compared with the conventional sheet reversing means such as a plate shape.

When a plate is used, it is necessary to make this plate the same size as or larger than the printing paper, and it is difficult to reduce the size. However, as in the present embodiment, the printing paper housing having a curved surface is accommodated. This is because the sheet can be turned upside down in the rolled state.

FIG. 3 shows a sheet reversing means 1 when storing printing sheets.
2 is a sectional view of the sheet reversing means 12, and FIG.

The guide mechanism 14 has a substantially triangular cross section as shown in FIG. 3, and guides by switching between storing and discharging the printing paper in the printing paper housing 13.

Here, FIG. 3 shows the case where the printing paper P enters the paper reversing means 12, and the arrow A indicates the entering direction. The guide mechanism 14 described above is provided on the outer periphery of the printing paper container 13 along the longitudinal direction near the opening into which the printing paper P enters.

That is, the guide mechanism 14 is rotatably supported by a shaft, and when the printing paper P is sent to the paper reversing means 12 (arrow A in FIG. 3), it is guided to the opening of the printing paper container 13 so as to be reversed. Rotate clockwise to secure an opening for accommodation in the printing paper container 13.

On the other hand, FIG. 4 shows the case where the printing paper P comes out of the paper reversing means 12, and the arrow B shows the discharging direction. When ejecting the printing paper P, the guide mechanism 14 rotates clockwise to guide the printing paper P in the printing paper container 13 toward the sub-transport path 11 connected to the main transport path 4, and the printing paper P is discharged. An opening is secured for discharging from the container 13.

The guide mechanism 14 shown in FIGS. 3 and 4 shows another example, and the shape thereof is not limited to the triangular cross section as long as it is a mechanism capable of guiding the accommodation and discharge of the printing paper.

The reversing roller 15 comprises a pair of rollers,
The printing paper P is switched by changing the rotation direction according to the accommodation and the ejection.
Is stored in the printing paper container 13 and discharged from the printing paper container 13. By configuring the reversing roller 15 with a pair of rollers, it is possible to suppress the friction given to the printing paper, and it is possible to prevent the print quality of one side just printed from being impaired.

FIG. 5 shows the guide mechanism 1 of the sheet reversing means 12.
4 shows a control map of the No. 4 and the reversing roller 15.

The drive control section detects the start or the completion of storage of the print sheet P in the print sheet container 13 by the sensor section 16 and acts on the drive section for driving the reversing roller 15 to rotate the reversing roller 15 in the rotating direction. To control.

With these configurations, one side of the printing paper P fed from the paper hopper 2 is printed by the printing means 8, and if printing only one side, it is ejected by the ejection roller 9 as it is. On the other hand, in the case of double-sided printing, the switching member 10 is operated to feed the sub-conveyance path 11, and the paper reversing means 12 on the sub-conveyance path 11 reverses the front and back sides of the printing paper P and passes the printing means 12 again. , The back side is printed.

[0052]

Since the present invention is constructed and functions as described above, according to the first aspect of the present invention, the sub-conveyance route is provided side by side with the main conveyance route, and their operations are directly related to each other. Instead, when the printing on one side is completed in the double-sided printing process and the printing paper is sent to the sub-conveyance route, the main conveyance route can start the next printing process.

As a result, the printing means can be used efficiently, the speed of printing processing including double-sided printing processing can be increased, and a double-sided printing apparatus with high printing efficiency can be provided. Further, the paper reversing means is characteristically constituted by the printing paper container, the guide mechanism, and the reversing roller, so that it is possible to provide the double-sided printing device that can achieve the above-mentioned effects and can reliably reverse the paper.

In particular, by adopting a printing paper container having a region for temporarily containing the printing paper therein, and forming a part or all of this into a curved surface or a cylindrical shape, the double-sided printing device of the present application can be realized. In addition, the curved surface along the insertion direction of the printing paper in the printing paper container allows the printing paper to be stored and ejected smoothly, and the paper can be turned over smoothly. Compared to the conventional device that uses a flat plate, the entire duplex printing device Can be made smaller.

Further, by forming the printing paper container so that its cross section has a spiral shape, it is possible to further reduce the size of the double-sided printing device while achieving the above-mentioned effects.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a double-sided printing device of the present invention.

FIG. 2 is a perspective view showing one form of a sheet reversing unit of the present invention.

FIG. 3 is a cross-sectional view when a sheet of the sheet reversing unit shown in FIG. 2 is stored in a printing sheet container.

FIG. 4 is a cross-sectional view when a sheet of the sheet reversing unit shown in FIG. 2 is discharged from a printing sheet container.

FIG. 5 shows a control map of a guide mechanism of the sheet reversing unit and a reversing roller.

FIG. 6 shows a configuration diagram of a conventional double-sided printing device.

[Explanation of symbols]

1 double-sided printing device 2 Paper hopper 3 paper feed rollers 4 Main transport route 5 photoconductor 6 Transfer roller 7 fixing device 8 Printing means 9 Paper ejection roller 10 Switching member 11 Sub transport route 12 Paper reversing means 13 Printing paper container 14 Guide mechanism 15 Reverse roller 16 Sensor section 4a Main transport roller 11a Sub transport roller P printing paper

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03G 15/00 106 G03G 15/00 510 3F053 510 B41J 3/00 S 3F100 F term (reference) 2C058 AB02 AF55 CA01 CA32 2C059 AA16 AB01 2C062 RA06 2H028 BA09 BA14 2H072 AA16 AA22 AA32 AB14 BB08 CA01 CB01 3F053 BA03 3F100 AA02 BA17 CA12 DA01 EA02

Claims (5)

[Claims] 1. A paper hopper for storing printing paper, a paper feeding means for feeding the printing paper from the paper hopper, a main conveyance path for guiding the fed-out printing paper in a predetermined direction, and A double-sided printing apparatus comprising: a printing unit disposed in the middle of a main transport path; and a sub-transport path that is arranged adjacent to the main transport path and is configured to join the main transport path. A switching member that switches the transport direction of the printing paper sent from the main transport path to the sub transport path is provided between the transport path and the downstream side of the main transport path. 2. A double-sided printing apparatus, wherein a sheet reversing means for reversing the front and back sides of the above is arranged on the sub-conveyance path. 2. The paper reversing means switches between and guides a printing paper container for temporarily housing the printing paper and accommodating and discharging the printing paper in the printing paper container. A guide mechanism arranged side by side on the outer periphery of the sheet container, and a reversing roller for reversing the print sheet by switching the rotation direction according to the accommodation and ejection, and a drive unit for driving the reversing roller. The double-sided printing device according to claim 1, further comprising a drive control unit for controlling the drive unit. 3. The double-sided printing apparatus according to claim 2, wherein the printing paper container has a curved surface along the insertion direction of the printing paper. 4. The double-sided printing apparatus according to claim 2, wherein the printing paper container has a substantially cylindrical shape. 5. The printing paper container is formed so that its cross section has a spiral shape.
Double-sided printing device described.