JPS6141561A - Dot matrix type printer - Google Patents

Abstract

PURPOSE:To obtain a small light wt. printer capable of performing high density printing by a decimal unit printing mechanism, by providing a means for reciprocally moving a printing head to a paper feed direction. CONSTITUTION:A printing head 6 is contacted with an eccentric cam 8 by the springiness of a pring 7 and, when the eccentric cam 8 is rotated around a shaft 9, the printing head 6 reciprocally moved along a guide 11 in the paper feed direction with respect to a stand 10. For example, when a character with 24X 24 dot constitution is printed, a printing needle p1 prints the dot a1.1 of a first character at first and a printing needle p2 prints the dot b1.1 of a second character. Next, the printing head 6 downwardly moves over an one printing dot interval in the paper feed direction by the rotation of the eccentric cam 8 and the printing needle p1 prints a dot a2.1 and similarly prints dots a3.1...a24.1. After printing is finished, the printing head moves rightwardly at a right angle to the paper feed direction and the printing needle p1 prints a dot a24.2 and the printing needle p2 prints a dot b24.2. By this method, even in a printer requiring high density printing, the wt. reduction of the printing head can be made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a dot matrix printer, and more particularly to a dot matrix (IJ) printer having a plurality of unit printing mechanisms.

(Prior Art) As shown in Figure 1, a conventional dot matrix printer is a dot matrix printer characterized by unit printing mechanisms arranged in rows in the sweep direction of the print head. The unit printing mechanisms 1 are arranged at equal intervals in the sweep direction of the print head perpendicular to It is located. The print head 3 having such a configuration is moved in a direction perpendicular to the paper feeding direction and prints dot matrix characters by sequentially operating each unit printing mechanism.

To explain the printing operation in a simple way, in Fig. 1, when the unit printing mechanism H7 is in the position of 3Fi, the unit printing mechanism H7 is in the position of 3).
t is printed, and then moved in the sweep direction by the distance between each printing needle, and the unit printing mechanism H6 prints a)a6. In this way, the 11th do y)as
*a4ea3*a! -at is printed. Further, the print head 3 moves b7°b6. h, , b, ,
Print in the order of b, , b, , b, go to print, and go to step 3.
reaches the position fB) and finishes printing one line. As a conventional example, we have explained about printing consisting of 7 unit printing mechanisms and C, but in order to print characters with a structure of 24 x 24 C and G, , it is clear from the above description that 24 unit printing mechanisms are required.

However, the conventional printing method has two drawbacks. In other words, when performing high-density printing with a 24 x 24 dot configuration, 24 unit printing mechanisms are required, and since the weight of the dots increases, the print head must be swept at high speed. This makes it difficult to operate and also causes vibration problems. Father, the other thing is, as is clear from the explanation of the printing action above.

To print one line, the moving distance of the do must be greater than the printing range by approximately the width in the sweep direction of the print head, and the width of the printer device is the first width.
As shown in the figure, even at the bottom of the liquid, the print range and print head width 2
The width of each piece is required.

Conventional dot matrix printers, which have a degree printing mechanism in which power is distributed in rows in the sweep direction, have problems with the sweep of the print head due to the increased weight of the print head when performing high-density printing. This method has serious disadvantages in that it is easy to use and the width of the device becomes large.

(Objective of the Invention) The present invention is to provide a small-sized dot matrix printer that eliminates the drawbacks of conventional dot matrix printers and is capable of high-density printing using a small-unit printing mechanism.

(Structure of the Invention) According to the present invention, a dot matrix in which several unit printing mechanisms are arranged in a row in the sweep direction of the print head, and prints by moving the print head in a direction perpendicular to the paper feeding direction; There is obtained a dot matrix type printer characterized in that the dot matrix type printer is provided with means for reciprocating the dots in the paper feeding direction for printing.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows a 22-print dot printer which is an embodiment of the present invention. In FIG. 2, the present embodiment is a HIH2 having printing needles 4 of l)tp, plm, respectively.
. . . It has a print head 6 configured by distributing 12 unit printing mechanisms 5 of HI3 at equal intervals perpendicular to the paper feeding direction. The printing head 6 is always in contact with the eccentric cam 8 due to the elasticity of the spring 7, and as the eccentric cam 8 rotates around the shaft 9, the printing is performed and the dirt is removed from the pedestal 10.
It is configured to reciprocate along with the kite 11 in the paper feeding direction. Although this embodiment uses a leaf spring for the unit printing mechanism, it goes without saying that the present invention is not limited to this case and can be applied to all other printing mechanisms.

Next, the operation of this embodiment will be explained.

3rd N shows the printing state in this embodiment. In FIG. 3, in this embodiment, for example, when printing characters in a 24×24 do,
Print 1. Next, to print, the dot moves downward in the paper feeding direction by one print dot interval due to the rotation of the eccentric cam 8, and the printing needle p1 prints do y) assl, and in the same way, do y) assl.

0 dots to print up to a4,1...a24+1) 3m4
．． 1 printing end bud The pedestal is moved to the right by a stepping motor or the like perpendicular to the paper feeding direction by one printing dot interval, and the printing needle P1 is moved to the printing needle Fb.
Print t: 4mM. In this way, the print head 6
When the printing needle 1)t completes the 4"11 sequence due to its reciprocating movement in the paper feeding direction and the sweep of the pedestal 10, the pedestal moves to the right in the sweeping direction by 11 character intervals and 1 printing dot interval. , 13th character do y ) ”1 # 1
is printed to form a dot matrix of 24×24 dots. In this way, in this embodiment, a print head with 12 unit printing mechanisms was explained, but in this printing method, one unit printing 4! ! ! Even a print head consisting of only a 24X
It is clear that high-density printing such as 24 dots is possible. Therefore, even in printers that require high-density printing, it is easy to make the print head lighter, and even the conventional dot matrix printers described in FIG. 1 can print.

In addition, according to this embodiment, the sweep distance of the print head is within the printing range, making it possible to downsize the printer. do.

Furthermore, since there are a small number of printed cherry blossoms in this example,
It has advantages in terms of print head reliability and cost.

Ideal for low-cost, small-g, lightweight printers.

(Measures of the Invention) As explained above, the present invention enables concealed printing by reciprocating the print head consisting of unit printing mechanisms arranged in rows in the sweep direction in the paper feeding direction. It is possible to obtain the effects that can be achieved with a small AM at a low cost and gloss.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventionally proposed dot matrix printer having unit printing machines arranged in the sweep direction, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. It is a figure showing the printing state in one example.

Claims (1)

[Claims] In a dot matrix printer in which a plurality of unit printing mechanisms are arranged in a row in the sweep direction of the print head and print by moving the print head in a direction perpendicular to the paper feed direction, the print head is moved in a direction perpendicular to the paper feed direction. A dot matrix printer characterized in that it is provided with means for reciprocating in the direction.