JPS60141579A - Printer - Google Patents

Abstract

PURPOSE:To enable printing in two colors and enable printing in multiple colors over the entire digit places with a small-type printer, by a method wherein two ink rollers comprising large diameter parts and small diameter parts provided alternately are provided adjacently to the other outer periphery of a type drum, and transfer is alternately conducted in every other row. CONSTITUTION:The first and second ink rollers 3, 4 provided with the large diameter parts 31, 42 and the small diameter parts 32, 41 are provided adjacently to the type drum 1 provided with types 2 on the outer periphery thereof, and the large diameter parts 31 are brought into contact with the types 21 in odd-numbered rows, while the large diameter parts 42 are brought into contact with the types 22 in even-numbered rows, and inks of respective colors are transferred. By driving a hammer 7 when the type 2 of the drum 1 comes to a printing position, an image is printed in the first color on a printing paper 8 by the type 21 in the odd-numbered row. When printing in the second color, a cam 6 is moved in the direction of an arrow A, whereby the drum 1 and the ink rollers 3, 4 are moved by a one-row distance, and printing in the second color can be conducted by impacting the type 22 by the hammer. Accordingly, the ink rollers for two colors can be easily manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a printing device using an ink roller, and particularly to a printing device that performs multicolor printing.

<Conventional technology> There is a strong demand for a mechanism capable of printing in multiple colors in printing devices, and a mechanism for printing in multiple colors using an ink roller was developed in U.S. Pat. Kaisho 48-867
As shown in Fig. 50, the circumference of the ink roller is divided into several parts, and the printing drum is also arranged in several series of type groups in the circumferential direction, and ink is applied in a way that they are related to each other. Also, the main printing devices were those that could divide the ink roller into several parts in the axial direction and print in different colors for specific digits.

In all such devices, different types of ink rollers must be installed on one ink roller shaft, so a partition is required for separation, and if the ink is impregnated with one color, there is no need to consider mixing. This is easy to do, but it is difficult because there are two or more colors, and the ink roller is very expensive.

In Fig. 4, since the printing drum must have first and second trusting characters on its outer periphery, the outer diameter of the printing drum becomes larger and the printing device also becomes larger. Ta. In addition, the printing type and the ink roller had to be related to each other in order to prevent color mixing, and it was difficult to assemble, as phase alignment was required.

In FIG. 5, it was possible to print in a different color only for specific digits, and the printing was unsatisfactory.

As described above, the conventional technology has drawbacks such as expensive ink rollers, large printing devices, difficulty in assembly, and inability to print in different colors except for specific digits.

<Objective of the present invention> The present invention eliminates these drawbacks, and its object is to:
To provide an ink roller for a printing device capable of multicolor printing at low cost. Another object of the present invention is to provide a printing device that is small in size, easy to assemble, and capable of printing in multiple colors over all digits.

<Characteristics of the Invention> In the present invention, two ink rollers are provided adjacent to the outer periphery of the type drum, and the ink rollers are configured such that the large diameter and small diameter are alternated in the direction of the digits, and one ink roller prints one line. The printing device is capable of two-color printing by transferring ink to one strip and using another ink roller to transfer ink to the other strips.

A specific example of the present invention will be explained using FIG. 1, FIG. 2, and FIG. 5.

FIG. 1 is a perspective view of a specific example of the present invention, and FIG. 2 is a perspective view of a specific example of the present invention.
FIG. 3 is a side view of the embodiment according to the figures; FIG. 3 is a plan sectional view of the embodiment according to FIG. 1;

1 is a type drum with type letters 2 arranged around its outer periphery; 03 is a first ink roller having a large diameter portion 31 and a small diameter portion 62; 21 to transfer ink. The small diameter portion 62 is not in contact with the type. Reference numeral 4 designates a second ink roller, which is provided with a large diameter portion 42 and a small diameter portion 41, and the large diameter portion 42 contacts the even number of printed characters 22 to transfer ink. The small diameter portion 41 is not in contact with the type. Now odd numbered letters 2
1 is a first color, and the even numbered characters 22 are transferred in a second color. The first ink roller 3 and the second ink roller 4 are housed in one ink roller cover 5◇
A cam 6 engages with the type drum 1 to determine the position of the type drum 1 in the digit direction. 7 is a hammer and 8 is printing paper.

In the case of printing in the first color, the printing device having such a configuration can print an odd number of characters 21 on the printing paper 8 by driving the hammer 7 when the characters on the type drum come to the printing position in this state.
can be printed in the first color.

When printing in the second color, if the cam 6 is moved in the direction of the arrow, the type drum 1 will also be moved by one strip in the digit direction. At this time, the first ink roller 3 and the second ink roller 4 also move in the digit direction according to the movement of the type drum 1. In this state, if the type 22 that has come to the printing position is hit with the hammer 7, it can be printed on the printing paper 8 in the second color.

A printing device having such a structure is capable of printing in two colors, but since each ink roller can print in a single color, there is no need for separation partitions, and ink impregnation is easy and can be manufactured at low cost. Also, by using two ink rollers, the amount of ink impregnated is increased, which has the effect of lengthening the life of the ink.

A type drum can also be made smaller by arranging one series of types around it. The first ink roller 6 and the second ink roller 4 are simply housed in the ink roller cover 5,
Setting is very easy, as there is no phase adjustment required. And the first color and the second color are also f? tj can be simply selected and all digits can be printed in the specified color.

<Effects of the Invention> As explained above, the two-color ink roller for the printing device is easy to manufacture and inexpensive, but the ink roller is a consumable item and a number of them must be used for each printing device. Therefore, if something inexpensive could be made, it would be very effective.

In addition, the printing device is small and can print in multiple colors over all digits, achieving the initial purpose and having a large effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a printing apparatus according to the present invention, and FIG.
FIG. 6 is a plan sectional view of the printing device according to FIG. 1, in which 1 is a type drum, 6 is a first ink roller, 4 is a second ink roller, and 6 is a cam. ,7
8 is the printing paper. FIG. 4, 5UA is a conventional printing device. Applicant: Epson Corporation, Patent Attorney, Mutsu Mogami, J4), 1. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A printing drum with type letters arranged around its outer periphery, and an fEl having portions with different diameters so as to contact the type letters at least every other row.
A first ink roller impregnated with ink of b. A printing device comprising a second ink roller impregnated with a second ink.