JPS60219868A - Character generator for both side print - Google Patents

Abstract

PURPOSE:To attain both-side print only with mode changeover without reversing a paper path mechanism by selecting freely whether character information is generated in the normal mode or generated in the reverse mode. CONSTITUTION:An input data is converted at first into the information of a mode in response to the print mode, the attribute of data line and the print start position by an input data processing section 21. In case of both-side print where the short-side direction is field, for example, and the print of odd number pages, the ''normal mode'' is set. The code information processed by an input data processing section is stored in a page data memory 22. Then a character generation control section 4 extracts a bit map corresponding to the code information from a font memory 23 and transmits it as a character bit patter to a scan buffer 25. In the read from the font memory 23, the normal font is selected at the normal mode and the reversed font is selected at the reverse mode and the result is read.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an image generating device for double-sided printing,
In particular, when performing double-sided printing in printers using the rusk scan method, image generation for double-sided printing allows the printing form to be changed for longitudinal binding or transverse binding without changing the paper path mechanism. Regarding equipment.

[Prior art]

A laser printer is an example of a printer that prints input image signals in the corresponding character format on a medium such as paper using the rusk scan method, and this laser printer can print on both sides. There are also some that are emerging.

In this laser printer that can print on both sides,
As shown in FIG. 1, which is a mechanical diagram of the paper path, scanning is normally performed horizontally in the longitudinal direction of the paper, and the printing paper P is fed from the paper feed section 1.
In the transfer section 2 having the photoconductor drum C, images of even pages are first transferred to the lower side of the paper surface, that is, to the photoconductor drum C side, and then fixed in the fixing section 3 . Thereafter, the paper surface is reversed in the reversing section 4 and transferred to the transfer section 2 again via the folding section 5. Here, the printing paper P receives the images of the odd pages on the reverse side of the surface on which the images of the even pages are printed, passes through the fixing section 3, and after the images of the odd pages have been transferred and fixed, the stacker Delivered to Department 6. In this way, both in single-sided printing and double-sided printing, the pages are printed one after another without changing the order of the pages, and are stacked in the stacker section 6.

As shown in the block diagram of FIG. 2, the character generator in this double-sided printer converts input data that is encoded and conveyed into an information format that expresses the attributes of the data line and the print start position. a data processing unit 11, a page data memory 12 for storing the information converted by the data processing unit, and a code information stored in the page data memory. A character generation control unit 14 calculates the address of the bitmap to be used and obtains image information for each scan line from the font memory 13, and develops the image information for each scan line formed in this way and generates a video image. It consists of 15 scan buffers for sending signals to the printing section.

Here, the attributes of the data line are determined by the character code string BCDE . At the same time, the print start position is the number of scan lines y until line generation. and the number of dots z0 on the line up to the printing start position, and these are set on the page data memory in a table format as shown in FIG. In FIG. 3, the horizontal arrow represents the scanning direction, and the vertical arrow represents the paper feeding direction.

Also, for example, as shown in Figure 5, the character code -
The address on the bitmap of V is calculated, a character image is generated from the font memory F, and the scan buffer is loaded. Incidentally, the line surrounded by the opening in the font memo IJp is expanded on the scan buffer S as the scan data of the number of scan lines plus the ninth scan up to line generation, and this is taken as a video signal. When this video signal is printed on both sides by a laser printer, the page structure is as shown in Figure 6(a), which is suitable for binding in the longitudinal direction (horizontal to the main scanning direction). However, when this is used for binding in the transverse direction (direction perpendicular to the main scanning direction), as shown in FIG. 6(b), the images on the first page P1 and the third page P3 are good, but the images on the second page are The image on page P3 is in an inverted state, and cannot be used as it is by binding in the transverse direction. In other words, odd-numbered pages are fine, but even-numbered pages are reversed, so if you want to change the binding direction, use the sixth (C)
) In order to print as shown in the figure, it was necessary to change the paper path mechanism and perform extremely complicated processing.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and is capable of forming double-sided prints for binding in the transverse direction and longitudinal direction of paper by changing the mode (1) without changing the paper path mechanism. The purpose is to provide a character generator.

[Structure of the invention]

In order to achieve the above object, the double-sided printing character generator of the present invention can
In order to be able to print normal pages and reversed pages, it is equipped with a bit pattern of the vertically reversed font for the characters used, and when printing a reversed page, the print position is changed for each text, and the bit pattern for each scan is changed. The pattern is read from the vertically inverted font, loaded into the scan buffer, and then read out from the reverse direction as a video signal, thereby generating a correct image and forming a double-sided print without inverting the paper path mechanism. It is something.

Here, normal page means normal mode, i.e., Section 7(a)
A page printed in the form shown in the figure is referred to as a page printed in the reverse mode, that is, a page printed in the form shown in FIG. 7(b).

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

This character generator for double-sided printing is shown in block diagram 8.
As shown in the figure, whether input data conveyed as code information is printed in normal mode or reverse mode, that is, information in a format depending on the data line attribute and print start position depending on the print mode. an input data processing unit 21 for converting the data into a font, a page data memory η for storing information converted according to the print mode by the input data processing unit, a bit pattern of a normal font of characters used, and a vertically inverted font. Receives code information from the font memory n consisting of a bit pattern and the page data memory, calculates the address of the bitmap corresponding to the information, reads the font memory okara bit pattern, and sequentially reads it as image information for each scan. It is composed of a character generation control section U that outputs characters, and a scan buffer δ that loads the image information sent out every scan and sends a video signal according to each mode to the printing section.

Here, the table format set in the page data memory 22 is E 9 (a) and 9 (b).
) As shown in the figure for normal mode and reverse mode, character code string - A11CDE in both modes, print start position (vertical position is number of scan lines until line generation - normal mode is Pop, reverse mode is y.'
, the horizontal position is the number of dots on the line until the start of printing - 2 degrees in both modes), the size of the character cell (width V)
, height 4, print mode - normal mode or reverse mode, font name - normal mode is represented by normal font salt, and reverse mode is represented by vertically reversed font salt.

As shown in FIG. 10, the print mode is divided into a normal mode and a reverse mode depending on whether it is for longitudinal binding or transverse binding, and whether the page concerned is an odd or even page. (See Figures 6(a) and 6(C).) For example, according to the table format set in the page data memory η, the print start position in the normal mode is as shown in Figure 7(a). As shown in the image of the normal page, the values are "or, yo", whereas in the reverse mode, as shown in FIG. 7(C), the values are χ.+2o'.

FIG. 7(C) conceptually shows an image (direction 1 position) on the scan buffer for generating characters on a reversed page. (Actually, the scan buffer -f only contains data for one scan line.) Here, when the lengthwise and widthwise sizes of the paper are W and .times., the following equation holds true.

yo' = '-1 (yo + ') In other words, in the inversion mode, the character code string and character size remain the same as in the normal mode, but the print start position is vertical direction only
. ′, and the font salt becomes the inverted font salt.

The character generation control unit 24 also controls the page data memo 1J2.
2, it is configured to receive information as shown in FIGS. 9(a) and 9(b), and read out the bit pattern for each scan according to the print mode. At this time, for pages printed in normal mode, the bit pattern is read out in exactly the same way as in the conventional case, whereas for pages printed in reverse mode, the horizontal direction of the printing start position is fixed at 2 degrees, and the vertical direction is fixed at 2 degrees. Reverse the direction. ', and read out the Pi pattern from the vertically inverted font. The read bit information is loaded into the scan buffer δ line by line, and the position and direction of the image on the scan buffer δ in the inversion mode are as shown in FIG. 7(C). . (However, this figure is for explaining the concept, and in reality only one line is loaded.) In other words, when printing in normal mode, the 11th (
a) As shown in the figure, the character generation control section selects the normal font F from the font memo 1J23, reads out a bit pattern using it, and loads it into the scan buffer B. In this case, the read address is determined by the following formula for each scan, and a pattern corresponding to the character width may be read from the scan start address an.

(ln: A + (n -1) δ an: Bit pattern scan start address A: Start address of the bit pattern of each character W: Character cell width expressed in number of dots -: Character cell width expressed in number of bytes Width δ n: Scan number within the character. Also, in the case of inversion mode, as shown in Figure U(B),
The character generation control unit Sae selects the vertically inverted font F' from the font memo 1JZ3, reads out a bit pattern using it, and loads it into the scan buffer B. The read address in this case is determined by the following formula as in the case of normal mode, and is the scan start address a.
It is sufficient to read out a pattern corresponding to the character width from n.

By the way, in the case of the inversion mode, it is necessary to invert the order in which the video signals are read from the scan buffer 5, invert the left and right images for each line, and send them to the printing section. Here, the character generation control unit reads the bit pattern, and when loading it into the scan buffer as image information for each scan line, it loads it from the normal direction and reads it from the opposite direction. is performing the inversion of

Next, the operation of this character generating device for double-sided printing will be explained.

First, the input data is converted into information in a format corresponding to the print mode, the tropism of the data line, and the print start position in the input data processing section 2. Here, the print mode is set in advance in the input data processing section 21 as shown in FIG. For example, when performing double-sided printing for transverse direction binding, the 6 normal mode is set when printing odd-numbered pages.

In this way, the code information processed in the above manner by the input data processing unit 21 is shown in FIG. 9(a) and FIG.
(b) As shown in the figure, the information is stored in the page data memory B as information with the necessary table format.

Next, the character generation control unit Sae generates the page data memo Q.
Based on 22 or more stored code information, a bitmap corresponding to the code information is taken out from the font memory n and sent to the scan buffer 6 as a bit pattern of the character corresponding to the code information. this,
The reading process of the font memory (font memory force) etc. is as follows:
a) IZ and as shown in Figure u(b). In other words, in the normal mode, from the font memo 1123,
A normal font F corresponding to the code information is selected, and the pit patterns are read out in order from the top and input into the scan buffer B as image information for each scan line. Also, in reverse mode, font memo 1
From J23, inverted font 1 corresponding to the code information
711 is selected, the bit patterns are read out in order from the top, and loaded into the scan buffer 5 from the normal direction as image information for each scan line. and,
Reading from the scan buffer 6 is done in the opposite direction and is sent to the printing section as a video signal. Therefore, in the case of inversion mode, the left and right patterns are inverted here.

In this way, when the printing of that page is finished, the print mode is set to a new reverse mode, and the next page (
The operation moves on to printing the even numbered pages...and so on, and the operation is repeated.

In this way, without changing the vapor path mechanism,
By switching the mode, double-sided printing for lateral binding is easily possible as shown in FIG. 6(C).

In addition, in the embodiment, odd numbered pages are set in normal mode,
Although we have described the case where even-numbered pages are printed in reverse mode, it goes without saying that the configuration may be such that odd-numbered pages are printed in reverse mode and even-numbered pages are printed in normal mode.

In addition, in the present invention, as shown in FIGS. 6(a) to 6(C), in the longitudinal direction of the paper? We have explained double-sided printing in landscape mode in which a character string is printed along the width of the paper, but as shown in Figures 12(a) to 12(C), character strings are printed along the width direction of the paper. Similarly, the device of the present invention can be applied to the portrait mode, that is, the 12th (
a) Double-sided printing in portrait mode as shown in the figure can only be done in the longitudinal direction, and if this is done in the longitudinal direction, an inconvenience as shown in the 12th (bJ figure) will occur.Therefore, the 12th
(C) To enable binding in the longitudinal direction as shown in the figure, it is sufficient to print the page images of even-numbered pages by flipping them vertically and horizontally for the entire page, as described in the landscape mode in the embodiment. The method is exactly the same as in landscape mode.

〔Effect of the invention〕

As explained above, if2 has been explained above, according to the character generation device for double-sided printing of the present invention, it is possible to select whether to generate character information in the normal mode or in the inverted mode, and by instructing mode switching on a page-by-page basis, In order to print normal pages and reversed pages, the bit pattern of the vertically reversed font of the characters used is added to the font memory, and when printing a reversed page, the print position is changed for each text, reading the bit pattern of each scan unit from the vertically reversed font;
Since the video signal is read out from the reverse direction after being loaded into the scan buffer, it is possible to print for longitudinal binding or transverse binding as required by simply switching the mode without reversing the paper bus mechanism. Become.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the paper path mechanism of a conventional laser printer, Fig. 2 is a block diagram of a character generator of a conventional double-sided printer, and Fig. 3 shows the print start position and data line in the device of Fig. 2. The diagram showing the attributes, Figure 4, is
FIG. 5 is a diagram showing an example of a table format set in the page data memory in the device, and FIG. ) The figure shows a state in which double-sided printing is done by a conventional laser printer and bound in the longitudinal direction.
Figure 6(a) is a diagram showing the state in which the paper is bound in the transverse direction, Figure 6(C) is a diagram showing the state in which both sides are printed in the correct direction with binding in the transverse direction, and Figure 7(a) is a diagram showing the relationship between the scan direction, paper feed direction, and print position in normal mode, and FIG. 7(b) is a diagram showing the same relationship in reverse mode, ν1,! 47 (C) is a conceptual diagram showing the position and direction of the bit pattern on the scan buffer in the inversion mode, FIG. 8 is a block diagram of the character generator according to the embodiment of the present invention, and FIGS. Figure 9(b) is a diagram showing the table format in each mode set on the page digital memory of the same device, and Figure 10 is a diagram showing appropriate print modes for longitudinal binding and transverse binding, respectively. 11(a) and u(b), respectively.
Figures 12(a) to 12(c) showing the bit pattern reading mechanism in normal mode and inverted mode;
) is a diagram showing the relationship between the binding direction in portrait mode and print mode. 1...Paper feeding section, 2...Transfer section, 3...Fixing section, 4
... Reversing section, 5. Folding section, 6. Stacker section, P
・Printing paper, C・Photosensitive drum, 11...Data processing section, 12...Page data memory, 13...Font memory, 14...Character generation control section, ]5...Scan buffer, 21... Input data processing section, n...
Page data memory,... font memory, Sae...
・Character generation control unit, ・Scan buffer. Fig. 1 Fig. 2 Entering Te "- Evening Fig. 3 S~V> Direction Fig. 4 Fig. 5, (71-Rusu friend m) (a) Fig. 6 (b) Fig. 6 (c) Fig. 7 (a) Clearance direction - V direction Fig. 7 (C) W □ Fig. 8 Fig. 9 (C1) Fig. 9 (b ) Figure 10 Figure 11 (b) Figure 12 (a) Figure 12 (b) Figure 12 (C)

Claims (1)

[Claims] In a character generating device for double-sided printing of a double-sided printer using the Rusk scan method, bits of the vertically reversed font of the characters used are set so that normal pages and reversed pages can be printed by a page-by-page mode switching instruction. When printing a reversed page, the print position is changed in text units, the bit pattern of each scan unit is read from the above-mentioned vertically reversed font, loaded into the scan buffer, and then printed from the reverse direction. A character generator for double-sided printing that is characterized by its ability to read data and convert it into a video signal.