JPS59148668A - Control system for character generator of dot printer - Google Patents

Abstract

PURPOSE:To permit both printing systems of half/full dots by a method in which printed dot pattern is compared with the content of a character generator corresponding to dot array to be printed next, and only the portion where dots are continued is spaced and then printed. CONSTITUTION:By a controller 7, a space motor M is controlled through a space speed/rotation amount setting circuit and a motor driver 14. A given letter pattern is loaded by a character generator 8 synchronously with the rotation amount of the space motor M, and the loaded letter pattern is latched to a data latch 11 through AND gate 10, a wire driver 12 is driven, and a given wire of the printing head 1 is projected. A series of control is made on these operations. In a comparator 9, data to be output from the data latch 11 to the wire driver 12 is compared with data to be sent from the controller 7 to the AND gate 10, and when both data are the same, operation is made in such a way that the output becomes ''0''.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a control system for a character generator of a serial dot matrix or printer.

[Prior art]

In a serialized, 7-matrix printer as shown in Figure 1, printing is carried out on paper 4 wrapped around platen
At that time, the space motor M rotates the feed screw 6 via the belt 5, and the printing is performed together with the gear 2. Printing is performed by moving the number 1 by space in the direction of arrow a. As shown in Fig. 2, at the tip of the print head 1, a plurality of wires W+, W2... are arranged in a direction perpendicular to the space direction. By selecting and driving the wires at tl+t2, . . . and causing them to protrude, a character such as 1A", for example, is formed on the paper 4 by a combination of dots D7, . . .

When forming a character like this 1A, the dot arrangement method is a method that prohibits horizontal dot arrangement at the minimum dot interval as shown in Fig. 6, for example, a wire is placed at the position tl in D5 in Fig. 3. If it protrudes, the next consecutive t2
・A method of arranging the dots so that the wire does not protrude at the position shown in FIG.

That is, there is a method that does not prohibit dot arrangement in the horizontal direction at the minimum dot interval. Hereinafter, the former method will be referred to as the half-dot method, and the latter method will be referred to as the full-dot method.

Here, if the protrusion period of the wire is constant, the former method has the advantage of being able to achieve twice the space speed, that is, twice the printing speed, as the latter method, but the dot structure becomes coarser and the print quality deteriorates. There are drawbacks.

Typical cereal dot tomatoes 1. Printers usually have a built-in character generator that uses one of the two methods, but some printers have a character generator that uses both methods for one character.
Some have built-in character generators that allow users to use different types of character generators depending on the purpose. Having these two types of character generators built-in is very useful for the convenience of the user, but it has the drawback of increasing costs.

[Purpose of the invention]

It is an object of the present invention to provide half/nord 2.0 without increasing the capacity of the character generator. The object of the present invention is to provide a control method for a character generator that enables printing of characters of both types.

[Summary of the invention]

The problem when attempting to print both half-dot and full-dot characters with one type of character generator depends on what algorithm is used to convert from one system to the other. One method is to toss one of the adjacent dots with a space (no dot) based on a character generator configured with a full dot method. It is also possible to consider a method in which a specific dot row, such as an odd-numbered dot row or an even-numbered dot row, is used as a space, but this method requires consideration that a specific dot row becomes a space when creating a character pattern, and It is not practical due to significant design limitations.

The feature of the present invention is that, based on a character generator configured in a full-dot system,
In the method of pasting one of the dots 7 times, compare the contents of the character gephrator corresponding to the dot row printed just before and the dot row to be printed next, and then This is where only the continuous part is used as a space for the next printing, and the generation of characters (turns) of the no-dot method is better than that of the full-dot method without damaging the main dots and dots that make up the character. becomes possible.

[Embodiments of the invention]

Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 5 shows Pro 1 of one embodiment of the present invention. This is a diagram. The control unit 7 controls the space motor Mf through the space speed/rotation amount setting circuit 13 and the motor driver 14, and also loads a predetermined character pattern from the character generator 8 in synchronization with the rotation amount of the space motor M, and generates capital letters by this loading. After the pattern is latched into the data latch 11 through the AND gate 10, the wire driver 12 is driven to make a predetermined wire of DO1 protrude for printing.

Further, the comparator 9 receives the data output from the data latch 11 to the wire driver 12 and the AND gate 1 from the control unit 7.
It compares the data sent to 0 and operates so that when both data are the same, the output becomes 10''.

In addition, this comparator can unconditionally set its output to tt 1 rr by setting the control signal S from the control section 7 to ``1''. , AND gates 10, and data latches 11 are provided in numbers corresponding to the respective wires of the print head 1.The character generator 8 stores character patterns formed by the full dot method. The operation will be explained. In the initial state, it is assumed that the data latch 11 is in the clear state, that is, the output is in the state of 0. When printing characters in the full dot system, the control section 7 first outputs the control signal b ( , 111''. Since the control signal becomes 1, the output of the comparator 9 becomes 11''. The output of the SAND gate 10 follows the content output from the control section 7. Next, the control section 7 is a space speed/rotation amount setting circuit 16 that sets the rotation amount according to the number of characters to be printed and the full speed 1
．． Specify the speed corresponding to the 7-tot method and start the space motor M. Each time the space motor M was started and the printing head 1 reached the printing position, the control section 7 loaded the character pattern data from the character generator 8'.
The character pattern data is passed through the AND gate 10 and sent to the cheeks and cheeks 11.

First, the wire driver 12 is activated and character patterns are successively printed. The character pattern printed here is determined by the data latched to the take latch 11.
The output of the comparator 9 is equal to the control signal from the control section 7 "1".
By setting ", the same data as the character pattern data loaded from the character generator 8 is loaded into the take latch 11, and a full-dot literary pattern is printed.

Next, the case of printing characters using the half-dot method will be explained.

The control unit 7 outputs a control signal i, −f*O/'. Next, the control section 7 sets the space speed and rotation amount in the space speed/rotation amount setting circuit 13 and starts the space motor M, as in the case of printing characters using the full dot method. Here, since the characters to be printed are half-dot characters, the space speed is set to twice the speed when printing characters using the full-dot and j-dot methods. Thereafter, the control unit 7 loads the character pattern data from the character generator 8 and transfers the character pattern data to the data latch 11 in the same way as when printing characters using the full dot method. Then, a series of operations for starting the wire driver 12 are executed.

Here, the difference from the full-dot method character printing is that the comparator 9 becomes effective because the control signal from the control section 7 is applied to 10''.The comparator 9 becomes effective. Then, in the character pattern data latched by the data latch 11, if the data latched at the previous printing timing is 11', NO" is latched, and 1. The data latched at the previous print timing is 11 Q L
If it is L, the same data as the data loaded by the control unit 7 from the character generator 8 will be latched. In other words, print just before
This will be compared with the content loaded from the character generator to be printed next, and only the parts with consecutive dots will be printed as spaces.

In this embodiment, circuit elements such as a comparator 9 and an AND gate 10 are used, but it is also possible to implement the present invention programmatically using a microprocessor.

〔Effect of the invention〕

According to the present invention, since it is not necessary to have two types of character generators, it is possible to reduce the cost by using a half-dot method.
Aldo 1. It is possible to provide a printer that can print characters in both formats.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a serial dot matrix printer, and FIG. 2 is a plan view showing a serial dot matrix printer. FIG. 3 is an explanatory diagram showing an example of printing using the full dot method; FIG. 4 is an explanatory diagram showing an example of printing using the full dot method; FIG. 5 is an explanatory diagram showing an example of printing using the full dot method; It is a professional five-dimensional diagram showing an example. 1... To print, 7... Control section, 9...
Comparator, 10...AND gate, 11...Data latch. Representative Patent Attorney Akira Takao Kiji ＼ Kaya / Figure 2 Figure 5

Claims (1)

[Claims] 1. In a serial dot matrix printer that has two types of printing speeds due to differences in the dot configuration of the same character, it has a character generator with a dot configuration that corresponds to a slow speed, and a character generator that corresponds to a faster speed than this character generator. A method for generating a character pattern is to compare the dot patterns of the character generator corresponding to the dot pattern printed just before and the dot row to be printed next, and then print only the part where the dots are continuous as spaces. A control method for a character generator for a dot printer.