JPS60259461A - Wire dot printer - Google Patents

Abstract

PURPOSE:To form a wire dot printer capable of good half-tone display and good color display by providing plural dot wires of different diameters. CONSTITUTION:A printing head 1 is provided with plural small dot wires 2 and plural large dot wires 3. The pitch P of the wires 2 is the same as that of the wires 3, and the interval between the wire 2 and the wire 3 is deviated by an interval of D. A carriage 4, fitted with the head 1, is provided with a shaft for enabling it to be slidably supported, a belt 6 whose both ends are attached to the carriage 4, and the first pulley 7. The second pulley 8 is wound with the belt 6. The first pulley 7 is attached to the head driver 9 such as a pulse motor, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire dot printer device, and particularly to a technique that is effective when applied to technical means for expressing halftones or colors.

The wire dot printer device uses dot wires of the same wire diameter to print dots one by one. When it is desired to add gradation, since the wire diameter of the implanted dots is constant, gradation is created using a plurality of dots (density pattern method).

Further, halftone processing is performed using the dither method to add shading.

However, the above-mentioned halftone processing method has a problem in that the image quality of images such as photographs deteriorates, making it impractical.

The present invention has been made in view of the above-mentioned problems, and its object is to provide a printing head capable of expressing high-quality halftones or colors in a wire dot printer.

Another object of the present invention is to provide a wire dot printer capable of expressing halftones or colors using the printing head.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

deep red The configuration of the present invention will be explained together with examples.

In all the figures, parts having the same functions are designated by the same reference numerals, and repeated explanations thereof will be omitted.

1 to 4 are diagrams for explaining a wire dot printer device according to Embodiment 2 of the present invention.

Fig. 1 is a perspective view showing a schematic configuration of a printing head section of a wire dot printer device, Fig. 2 is a schematic diagram showing the arrangement of dot wires in Fig. 1, and Fig. 3 is a detailed configuration of the printing head. FIG. 4 is a circuit diagram showing the configuration of a control circuit for controlling printing of the printing head in Example I.

In FIG. 1, numeral 1 denotes a printing head, which includes a plurality of thin dot wires 2 and a plurality of thick dot wires 3. The arrangement pitch P of each of the thin dot wires 2 is the same as the arrangement pitch P of each of the thick dot wires 8, as shown in FIG. 2, and the arrangement pitch of the thin dot wires 2 and the thick dot wires 3 is shifted by D. There is. 4 is a carriage, to which the print head 1 is attached.

5 is a shaft for slidably supporting the carriage 4, 6 is a belt whose both ends are attached to the carriage 4, 7 is a first pulley, and 8 is a second pulley, around which the belt 6 is wound. 9 is a printing head drive device such as a pulse motor, and the first pulley 7 is attached to this rotating shaft. 10 is a platen, and 11 is paper.

In FIG. 3, IA is the print head housing, I
B73 to IE are guide members for dot wires 2 and 3, and IF is a spring;
This is to return it when it is not pressed. IGI, lG2 are electromagnetic coils, IHI, IH
2 is the core of the electromagnet, IJ is the yoke of the electromagnet, IKI, 1
2 is the armature of the electromagnet, and IL is the stopper.

In FIG. 4, 12 is an analog-to-digital converter (hereinafter simply referred to as an A/D converter), and 13 is a halftone processing circuit for performing halftone processing using the dither method or the density pattern method. It outputs a small dot signal 1110 #l or a large dot "1" depending on the video signal. 14 is a delay circuit, 15 is a first buffer for temporarily storing a small dot signal (signal for selecting thick dot wire 2), and 16 is a large dot signal (signal for selecting thick dot wire 3).
a second buffer for temporarily accumulating the
Dot wire drive circuits 17 and 18 are used to control the printing operations of the dot wires 2 and 8, respectively. V-D is a video signal, and D-3 is a digital signal.

Next, the operation of the wire dot printer of this embodiment I will be explained.

1 to 4, a video signal V-D is input to an A/D converter 12. In FIG. The A/D converter 12 performs gradation processing on the video signal VD and converts it into a digital signal. This converted digital signal is processed by a halftone processing device 18.
According to the density of the video signal V-D, the small dot signal II OIP or the large dot signal "1" is output.The small dot signal "0" is accumulated in the first buffer 15, and the large dot signal II 171 is accumulated in the second buffer 16. At this time, there is a deviation in the placement position of the thin dot wire 2 for printing small dots and the thick dot wire 3 for printing large dots, but this is due to the difference between the dots forming the image. It can be easily controlled by setting the pitch between the dots to be an integer multiple of 61 or more. In other words, the large dot signal "1'
'' is output, the delay circuit 14 corrects the dot position of the output signal by a time corresponding to the width of the arrangement positions of the thin dot wire 2 and the thick dot wire 3 in the guide section, and then outputs a second signal. The signals are stored in the buffer 16.If the large dot signal is set in advance, the small dot signal may be delayed.Signals stored in the first and second buffers 15 and 16 is the printing head 1 through the dot wire drive circuits 16 and 17.
is supplied to the electromagnetic coil lG+ or lG2 of the electromagnet. As a result, the armature IK or IK2 is attracted, the dot wire 2 or 3 is pressed, and a predetermined dot is printed.

In addition, when a line is to be broken, the line is to be broken by one head.

If you want to print in color, use cyan on the ink ribbon,
It is sufficient to use ribbons of three colors, yellow and magenta, or four colors in addition to black, and perform the same operation as described above for each color.

FIG. 5 is a schematic diagram showing the arrangement of dot wires in a printing head according to another embodiment (2) of the present invention.

As shown in FIG. 5, the printing head of this embodiment has dot wires 2OA to 20E of different diameters arranged in series. As shown in FIG. 6, the control circuit includes delay circuits 21B to 21B which delay the dot wires 2OA to 20E by a time corresponding to the arrangement position of each dot wire 2OA to 20E at the subsequent stage of the halftone processing circuit 13 of the control circuit of Embodiment I. 21E, buffers 22A to 22E, and dot wire drive circuits 23A to 23E.

j ＊□□. Wire, 21.1. , -j, 1. □ is
The operation is similar to that of the first embodiment.

7 to 9 are diagrams for explaining a wire dot printer device according to another embodiment (2) of the present invention, in which FIG. 7 is a perspective view showing the schematic structure thereof, and FIG. FIG. 9, which is a schematic diagram showing the arrangement, is a circuit diagram showing the configuration of the control circuit of this embodiment (2).

As shown in FIG. 7, the wire dot printer device of this embodiment
0B and 30C, and the respective dot wires 31A, 31B and 31C are as shown in FIG.
Arranged. As shown in FIG. 9, the control circuit includes delay circuits 32B, 32G and buffers 33A, 33B at the subsequent stage of the halftone processing circuit 13 of the control circuit of the embodiment I.
.

33C and dot wire drive circuits 34A, 34B.

34C.

The wire dot printer of this embodiment (2) operates in the same manner as that of the above embodiment (2). 1 Figure 1O and Figure 11
The figures are diagrams for explaining a wire dot printer device according to another embodiment (2) of the present invention, in which FIG. 10 is a perspective view showing a schematic configuration thereof, and FIG. FIG. 3 is a schematic diagram showing the arrangement and operating principle.

As shown in FIG. 10, the wire dot printer device of this embodiment (2) has dot wires 40A arranged in multiple stages.

A dot wire bank 41 having a diameter of 40B is provided, and this dot wire bank 41 is movably attached to the outer periphery of a pulley 7 attached to the rotating shaft of the print head drive device 9. That is, it is a swing printing method, and the dot wires 40A, 4 have different diameters for each line.
A plurality of 0Bs are arranged, and as shown in FIG. 11,
The dot wires 40A and 40B of each line are caused to perform a printing operation according to a sine wave.

In the figure, numeral 42 is a dot wire bank supporting plate, which facilitates the swinging printing operation.

As explained above, according to the novel technical means disclosed in the present application, it is possible to provide a wire dot printer device capable of good halftone expression and color expression by providing a plurality of dot wires with different wire diameters. can.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without changing the gist thereof.

[Brief explanation of drawings]

1 to 4 are diagrams for explaining a wire dot printer device according to a first embodiment of the present invention, and FIG. 1 is a perspective view showing a schematic configuration of a printing head section of the wire dot printer device; Figure 2 is a replica showing the arrangement of the dot wires in Figure 1, Figure 3 is a sectional view showing the detailed configuration of the print head, and Figure 4 is a circuit of a control circuit that controls printing of the print head. 5 and 6 are diagrams for explaining the printing head of a wire dot printer device according to another embodiment (2) of the present invention, and FIG. 5 is a reproduction showing the schematic structure of the dot wire portion thereof 6 is a circuit diagram showing the configuration of a control circuit that performs printing control, and FIGS. 7 to 9 are diagrams for explaining the wire dot printer device of Embodiment FIG. 7 is a perspective view showing its schematic configuration. FIG. 8 is a schematic diagram showing the arrangement of dot wires in the printing head for one character, FIG. 9 is a circuit diagram showing the configuration of a control circuit that controls the printing operation of the printing head of Example ①, and FIG. 10 and 11th
The drawings are diagrams for explaining a wire dot printer device according to another embodiment (2) of the present invention. FIG. 10 is a perspective view showing the schematic configuration thereof, and FIG.
FIG. 2 is a schematic diagram for explaining the arrangement of dot wires and the principle of operation of the print head. In the figure, 1.30A, 30B, 30C:...printing head, 2.40A...thin dot wire, 3,40B...
・Thick dot wire, 4... Carriage, 5...
Shaft, 6...Belt, 7...1st pulley, 8...
・Second pulley, 9...Printing head drive device, 1o・
...Platen, 11...Paper, 12...Analog...
Digital converter, 13... Halftone processing circuit, 14.2
1B to 21E, 32B, 32C...Delay circuit, 15
... 1st buffer, 16... 2nd buffer, 17,
1 to 23A to 23E, 34A, 34B
...Dot wire drive circuit, 22A to 22E, 33
A, 33B. 33 G... Buffer, 41... Dot wire bank 42... Leaf spring for dot wire bank. Agent Patent Attorney Shuki Akita

Claims (2)

[Claims] (1) A printing head for a wire dot printer that prints using dot wires, characterized in that a plurality of dot wires having different wire diameters are provided. (2) A wire dot printer device that prints using dot wires, characterized in that a plurality of dot wires having different wire diameters are provided and a drive circuit is provided that changes drive energy according to the wire diameter of each of the dot wires. Dot printer device.