JPS61185450A - Emphasizing printing system - Google Patents

Abstract

PURPOSE:To obtain an emphasizing printing system suitable to a non-impact printer by providing a signal generation means generating an emphasizing control signal indicating a degree of emphasis in a printing by the printer in accordance with an external instruction. CONSTITUTION:A signal indicating a degree of emphasis for emphasizing printing is supplied from a superior logic apparatus 1 of this printer to a control section 7, and from the first to fourth emphasizing control signals 7a-7d are generated respectively. In the case where an instruction from the superior logic apparatus 1 is the first emphasis, only an output of 7a from the control section 7 becomes high level. An output 3 from a dot data generation section 2 is inputted into a shift register 4, and displaced to 4a, 4b, 4c, 4d by a clock 8 in turn. In this time, only the first gate among the gate circuits is opened. In an adding circuit 6, the dot data 3 and a gate output 5a are inputted in an electronic photo developement section 9 being added each other, and a letter having a laterally expanded breadth by one dot is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an emphasis printing method, and more particularly to an emphasis printing method suitable for use in an electrophotographic non-impact printer.

11ゑI In conventional impact printers, when it is desired to print a certain specific character in an emphasized manner, it is printed twice using a print hammer to increase the density and distinguish it from other characters, thereby emphasizing the printing.

However, with electrophotographic non-impact printers, it is meaningless to print multiple times at the same location to emphasize the characters as described above, and therefore, with such a device, only one dot in the horizontal direction is printed. At present, the line width of the characters is increased by adding them to emphasize printing.

In such a case, it is necessary to perform dot development twice for the same character in the dot data generation unit for printing.
This is a burden on the performance of the device.

Furthermore, when it is desired to change the degree of emphasis, it is necessary to perform dot expansion several times, resulting in increased complexity in terms of performance or control theory.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an emphasis printing method suitable for a non-impact printer that realizes emphasis printing with a simple configuration and allows the degree of emphasis to be easily changed by external instructions.

The emphasis printing method according to the present invention includes a dot data generation means for generating dot data for printing, a multi-stage shift means for sequentially shifting this dot data at a predetermined period, and a shift means for printing in accordance with an external command. A signal generating means for generating an emphasis control signal indicating the degree of emphasis, a gate means for selectively deriving an output according to the emphasis control signal from among the outputs of a plurality of stages of the shifting means, and a dot data generating means for the gate output and the dot data generating means. The present invention is characterized in that it has an adding means for adding the output data of , and emphasizing printing is performed by this addition output.

1 lid 1 Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which numeral 1 is a higher-order logic device and numeral 2 is a dot data generating section. In this dot data generating section 2, the upper logical device l! A printing character pattern is generated according to instructions from 1, and dot data 3 corresponding to each character is generated. This dot data 3
serves as the first stage input of the four-stage shift register, and also serves as the sole power of the adder circuit 6.

The shift register 4 sequentially shifts dot data using a clock CK8 having a predetermined cycle, and the shift outputs of each stage are shown as 4a to 4d.

On the other hand, a signal indicating the degree of emphasis for emphasis printing is supplied from the upper logic device 11 to the control unit 7, and this signal causes the first to fourth emphasis control signals 7a to 7d to be generated, respectively. It has become. This strong I11 control signal 7a
7d are the respective human powers of the four AND gate circuits 5, and the aforementioned shift outputs 4a to 4d are applied to each human power, respectively. Each of the gate outputs 5a to 5d of the gate circuit 5 serves as an input to an adder circuit 6, and any of these gate outputs and the dot data 3 are added and supplied to the electrophotographic developing section 9.

In this configuration, it is assumed that the command from the upper logical device 1 is the first emphasis. In this case, among the outputs from the control section 7, only 7a is at a high level, and outputs 7b, 7c, and 7d are at a low level. On the other hand, output 3 from the dot data generator is input to shift register 4. In the shift register 4, data is shifted by a clock 8, and the outputs move from 4a to 4b to 4c to 4d.

Here, since only the output 7a from the control section 7 is at a high level, only the first gate of the gate circuit 5 is opened. In the adder circuit 6, the dot data 3 and the gate output 5a are added, and the result of this addition is input to the electrophotographic developing section 9, thereby generating a character whose width is expanded by one dot in the horizontal direction.

Now, if the characters printed by dot data are as shown in FIG. 2(a), the emphasized printing pattern at this time will be as shown in FIG. 2(b).

Further, if the command from the upper logic bag H1 is the fourth emphasized printing, only the signal 7d from the control section 7 becomes high level and the others become low level. Therefore, the gate circuit 5
Only the th gate is opened, and the output 5d of this open gate is added to the dot data 3 in the adding circuit 6, and the printing result is shown in FIG. 2 (.). Like, na 6. Engineering Ah. In this manner, various types of emphasized characters can be easily generated by commands from the higher-level logic device 1.

In this embodiment, a shift register having four stages is used, but a shift register having a number of stages other than this may be used, and it is possible to perform emphasis according to the number of stages of the shift register.

Normally, electrophotographic non-impact printers have a dot density of 240 or 300 dots per inch. In this embodiment, if the density is 240 dots per inch, the line width of the character will be approximately 0.1 m in the case of normal printing as shown in FIG. 2(a). In FIG. 2(b) where the first emphasis is specified, the horizontal line width is approximately 0.2 mm. On the other hand, in the case of the fourth emphasis shown in FIG. 2(C), an interval of about 0.3 JIl11 occurs, resulting in shadow printing, and the character is emphasized.

Effects of the Invention According to the present invention, it is possible to control many types of emphasized printing with an extremely simple configuration, and it is highly versatile.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing a printing mode realized by the apparatus shown in FIG. 1, respectively. Explanation of symbols of main parts 2... Dot pattern generation section 4... Shift register 5... Gate circuit 6... Adder circuit 7...
・Control section 9...Electrophotographic development section

Claims (1)

[Claims] A dot data generation means for generating dot data for printing, a multi-stage shift means for sequentially shifting the dot data at a predetermined period, and an emphasis control signal that generates an emphasis control signal indicating the degree of emphasis in printing based on an external command. a gate means for selectively deriving an output according to the emphasis control signal from among the plurality of outputs of the shift means; and a gate means for adding the gate output and the output data of the dot data generation means. 1. An emphasizing printing method, comprising: an adding means, and emphasizing printing is made by the output of the addition.