JPH082018A - Page printer for printing both sides - Google Patents

Abstract

PURPOSE:To obtain a page printer for printing both sides which can prevent a false operation and a false motion in high safety and/also can execute both- side printing quickly without printing unnecessary print data doubly. CONSTITUTION:On the occasion when inputted print data are parted into odd- number and even-number pages and both-side printing is executed by reversing the surface and the rear of paper inside an apparatus, in a page printer for printing both sides, a state of print on the paper is recognized by a scanner 4 for recognition of characters before the printing is executed actually, that is, before the paper reaches a photoreceptor drum 2, the print data thus recognized and print data in a buffer memory (not shown in the Figure) expressing the content of print stored beforehand are collated with each other in a control part (not shown in the Figure) so as to avoid a false operation and a false motion, and then the both-side printing is conducted. Thereby the both-side printing can be executed quickly without printing unnecessary print data doubly on the same page.

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 page printer capable of double-sided printing on both sides for saving paper.

[0002]

2. Description of the Related Art Conventionally, a double-sided printing page printer of this type is of a type in which printing is performed by using the other side of a sheet that has been printed once on one side, or the sheet is printed from one side to the other. There is a type that prints by turning over automatically on the surface of. When printing the print data indicating the print contents according to the former type and printing on both sides of the paper, it is necessary to manually set the paper from one side to the other side inside out, The latter type eliminates the need for human intervention.

Incidentally, as a known technique related to a general page printer, for example, the page printers disclosed in JP-A-2-292075 and JP-A-3-39758 can be cited. As a known technique related to control, Japanese Patent Laid-Open No. 63-849
Japanese Patent Laid-Open No. 54-54
A double-sided printing device disclosed in Japanese Patent No. 226333 is cited.

[0004]

Since none of the above-mentioned page printers has a function for preventing erroneous operations and malfunctions, unnecessary print data is erroneously duplicated on the same page (on the front or back surface of the paper). There is a risk of printing.

In such a case, especially when it is necessary to reload printed paper, not only the original paper saving is wasted, but also the time required for double-sided printing is unnecessarily long.

The present invention has been made to solve the above problems, and its technical problem is to prevent erroneous operations and malfunctions with high safety and to prevent unnecessary printing data from being double printed on the same page. It is an object to provide a double-sided printing page printer that can perform double-sided printing quickly.

[0007]

According to the present invention, a paper transport mechanism for transporting a predetermined paper in both front and back directions, a photosensitive printing section for performing a photosensitive printing on both front and back surfaces of a predetermined paper, and a paper transport In a double-sided printing page printer including a mechanism and a control unit for controlling the operation of the photosensitive printing unit, a supply unit and a photosensitive printing unit which are close to an installation unit for a predetermined paper and which supply the predetermined paper to a conveyance path. The control section includes a character recognition detection section which is provided between the two and outputs a character recognition detection signal by detecting the printing state of the front surface or the back surface of the predetermined sheet, and the control section includes a sheet conveyance mechanism section based on the character recognition detection signal. Also, a double-sided printing page printer for controlling the photosensitive printing section can be obtained.

According to the present invention, in the above-mentioned double-sided printing page printer, the control unit includes a data storage unit for storing print data indicating print contents of a portion printed on the front surface or the back surface of a predetermined paper, and the control unit includes the data storage unit. A double-sided printing page printer is obtained which controls the reading of print data by the printer and controls the paper transport mechanism and the photosensitive print unit based on the result of referring to the character recognition detection signal and the print data.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A double-sided printing page printer according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side view showing the basic construction of a double-sided printing page printer according to an embodiment of the present invention.

This double-sided printing page printer has a paper transport mechanism for transporting a predetermined paper in both front and back directions, and a print showing the print contents input from an external device (usually a personal computer) on both front and back surfaces of a predetermined paper. It includes a photosensitive drum 2 as a photosensitive printing unit that performs photosensitive printing according to data, and a control unit (not shown) that controls the operation of the paper transport mechanism and the photosensitive drum 2.

Of these, the paper transport mechanism is close to the paper tray 1 which is the installation portion for the predetermined paper, and is provided at the rear stage of the photosensitive drum 2 and the supply roller 5 as a supply unit for supplying the predetermined paper to the transport path. Fixing device 6 provided, supply roller 7 provided in the vicinity of the discharge port for a predetermined sheet, page distribution plate 10 provided in the vicinity of the discharge port so as to branch the discharge direction and the transport direction of the predetermined sheet, a predetermined It includes a reversing roller 9 for reversing the sheet conveyance direction, and a supply roller 8 provided near the reversing roller 9.

Further, in this double-sided printing page printer, character recognition detection is performed between the supply roller 5 and the photosensitive drum 2 to detect a printing state on the front surface or the back surface of a predetermined paper and output a character recognition detection signal. A character recognition scanner 4 is provided as a unit, and a light shield plate 3 for blocking the radiation light emitted from the photoconductor drum 2 itself is provided near the photoconductor drum 2. Further, this double-sided printing page printer is provided with a buffer memory (not shown) as a data storage unit for storing print data indicating print contents of a portion printed on the front surface or the back surface of a predetermined sheet.

The control unit here controls the reading of print data by the buffer memory during double-sided printing, and based on the result of referring to the character recognition detection signal from the character recognition scanner 4 and the print data from the buffer memory, the paper is printed. The transport mechanism section and the photosensitive drum 2 are controlled. However, each of the rollers is attached to the rotary shaft of a rotary drive mechanism (not shown), and is rotated by the control of the rotary drive mechanism of the control unit. It is assumed that all of the above are controlled by the control unit.

In this double-sided printing page printer, the input print data is sorted into odd-numbered pages and even-numbered pages, and the front and back sides of the paper are reversed in the apparatus to perform double-sided printing.
Before the actual printing, that is, before the paper reaches the photosensitive drum 2, the character recognition scanner 4 recognizes the printing state on the paper and collates it with the print data in the buffer memory indicating the print content. Perform double-sided printing after avoiding erroneous operation and malfunction. As a result, double-sided printing can be performed quickly without double printing unnecessary print data on the same page.

FIG. 2 is a flow chart showing the operation control by the control unit of the double-sided printing page printer.

The control unit of this double-sided printing page printer reads the input print data into the buffer memory in the apparatus (step S1). At this time, the control unit adds an identification code of even pages or odd pages and an identification code of whether output has already been performed for all pages with respect to the print data. Next, as the first page, paper is replenished from the tray (step S2), the paper is recognized by the scanner (step S3), and then it is determined whether there is no print data (step S4).

As a result, if there is no print data,
This sheet is regarded as a blank sheet and one page of print data is printed on the sheet (step S5). However, if it is recognized that there is print data, the subsequently recognized print data and all the data in the buffer are displayed. By collating, it is determined whether the content is in the buffer (step S1).
0)

As a result, if there is no matching data in the buffer, the supplied paper is regarded as a document that is not related due to a malfunction, and the paper is ejected (step S11). The process returns and waits before the process of replenishing paper from the tray (step S2), but if there is matching data, the print data for that page will already be printed on the tray again due to device malfunction or failure. It is considered that it has been set, and the skip processing (step S12) is performed so that the printed code on the buffer is turned on and the next operation is performed without outputting the print data.

On the other hand, the printing process on the paper (step S
After 5), it is determined whether or not the entire printing is completed, as in the case after the skip processing (step S12) (step S6).
If the printing is completed, the operation is completed (step S1
3) However, if it is determined that the printing is not completed and the print data still remains, it is determined whether or not the current printing position is an even page (step S7).

As a result, if the page is an even-numbered page, after ejecting the paper to send the current page (step S8), the process returns and waits before the process of replenishing the paper from the tray (step S2). For example, assuming that printing on the back page has not been completed, the paper is reversed by the reversing roller 9 and the page distribution plate 10 shown in FIG. 1 (step S9), and then the paper is replenished from the tray (step S2). Return before and wait.

[0022]

As described above, according to the double-sided printing page printer of the present invention, in the case of a malfunction such as a paper jam or a malfunction such as when already printed paper is set in the installation section, Before the actual printing on the paper, the character recognition detection unit recognizes the printing status of the paper and collates it with the print data in the data storage unit that shows the print content, so that the control unit avoids erroneous operations and malfunctions with good stability. Therefore, double-sided printing can be performed quickly without double printing unnecessary print data on the same page.

[Brief description of drawings]

FIG. 1 is a side view showing a basic configuration of a double-sided printing page printer according to an embodiment of the present invention.

FIG. 2 is a flowchart showing operation control by a control unit of the double-sided printing page printer shown in FIG.

[Explanation of symbols]

 1 Paper Tray 2 Photosensitive Drum 3 Light Shield 4 Character Recognition Scanner 5, 7, 8 Supply Roller 6 Fixing Device 9 Reversing Roller 10 Page Sorting Plate

Claims (2)

[Claims] 1. A paper transport mechanism for transporting a predetermined paper in both front and back directions, a photosensitive printing section for performing photosensitive printing on both front and back surfaces of the predetermined paper, and operation of the paper transport mechanism and the photosensitive printing section. In a double-sided printing page printer including a control unit for controlling the
Character recognition that is provided between the supply unit that supplies the predetermined paper to the conveying path and the photosensitive printing unit and that detects the printing state of the front surface or the back surface of the predetermined paper and outputs a character recognition detection signal. A double-sided printing page printer including a detection unit, wherein the control unit controls the paper transport mechanism unit and the photosensitive printing unit based on the character recognition detection signal. 2. The double-sided printing page printer according to claim 1, further comprising: a data storage unit that stores print data indicating print contents of a portion printed on the front surface or the back surface of the predetermined paper, and the control unit includes: Double-sided printing characterized by controlling reading of the print data by a data storage unit and controlling the paper transport mechanism unit and the photosensitive print unit based on a result of referring to the character recognition detection signal and the print data Page printer.