JPS6029635B2 - printing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a printing device using multicolor character wheels.

In a printing device using an ink roller, a print stain prevention mask is provided to cover the type every other digit, and this mask is moved left and right alternately by the pitch of one digit to print one line, reducing the digit pitch. This makes it possible to easily solve the problem of printing energy.

By the way, in such a printing device, it is conceivable to divide the ink roller into a plurality of different color portions in the direction of the rotation axis to enable multicolor printing.

However, since the amount of ink that oozes from an ink roller is generally small, it is common sense that the end portion in the scale direction is not used. For this reason, the distance between the character strings located at the positions corresponding to the color boundaries of the ink roller needs to be larger than the distances between the other character strings. However, if this is done, the pitch between the character rows at the positions corresponding to the color boundaries will be different from the others, and when the stain prevention mask is moved, some masks will not cover the characters. However, if printing is performed by striking with a hammer at this time, there is a problem that the mask that does not cover the type will bend more than necessary, causing ink to inadvertently adhere to the paper. The present invention eliminates the above-mentioned drawbacks, and prevents the mask at the position corresponding to the color boundary of the ink row from being bent more than necessary by the hammer blow when the stain prevention mask is moved. be. This will be explained below according to the drawings. In FIG. 1, reference numeral 1 denotes an ink roller shaft having ink rollers of two colors, la and lb.

2 is a character wheel, and an ink roller la is in contact with the character row 2a of the character wheel 2 to apply red ink, for example, and the character row 2b is applied with red ink.
is in contact with an ink roller b and coated with, for example, black ink, and a hammer 5 prints letters on the paper 6 in the digits that are not covered by the stain prevention mask 4.

Next, as shown in FIG.
The digits are moved, the digits previously covered with the dirt prevention mask 4 are exposed, and the hammer 5 is operated again to finish printing one digit.

At this time, as shown in FIG. 3, if the color boundary between the character rows 2a and 2b is only a groove, when the character part 2a is hit with the hammer 5a to print on the 6a part of the paper 6, the specific part of the mask 4 4a has moved from the type string 2b, and 2
Since the distance between a and 2b is particularly wider than the distance between other adjacent character rows, the ink of the character row 2b inadvertently adheres to the grade 6 specific portion 6b, staining the paper 6. To prevent this,
A stain prevention band 3 as shown in FIG. 4 is provided at the color boundary between the character rows 2a and 2b. 3 has almost the same height as 2a and 2b, and is formed in a band shape in the circumferential direction with a thin width so that it always contacts only the ink roller b.

With this configuration, it is possible to prevent the paper 6 from becoming inadvertently soiled.

Moreover, this anti-staining band can be manufactured integrally with the ordinary type strings 2a and 2b, which has the advantage of being inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a diagram showing the dirt prevention mask 1 shifted one digit to the right, and FIG.
The figure shows a conventional example, and FIG. 4 is a partially enlarged view of the present invention. 2... Letter wheel, 3... Dirt prevention band. Figure 1 Figure 2 Younger brother Figure 4

Claims (1)

[Claims] 1. A character wheel that rotates integrally with a group of character strings arranged in a plurality of digits in the direction of the rotation axis, an ink roller that applies ink to each character row of the character wheel, and an ink roller provided for each character row. It has a hammer and a dirt prevention mask that is placed between the hammer and the character wheel and covers the type string every other digit, and by moving the dirt prevention mask one digit in the direction of the rotation axis of the character wheel,
In a printing device configured to print lines, the ink roller is divided into a first color portion and a second color portion in the axial direction, and the character wheel is formed in the first color portion of the ink roller.
forming a first printed character part and a second printed character part by narrowing a color boundary part having a width larger than the distance between the adjacent printed character rows corresponding to the colored part and the second colored part; The color boundary portion has a stain prevention band formed in a band shape in the circumferential direction and having approximately the same height as the printed characters at a position covered by the stain prevention mask when the stain prevention mask is shifted. Characteristic printing device.