JPS58185263A - Printer - Google Patents

Abstract

PURPOSE:To obtain a printer capable of easily carrying out multicolor printing by such an arrangement wherein one type belt is divided into a plurality of stages arranged vertically and a row of type group is provided in each of those stages. CONSTITUTION:On one type belt 3 which is spread over between a drive pulley 1 and a follower pulley 2, rows of type group 24, 25 are formed in a plurality of stages arranged vertically (2 stages in this figure). At this time, rows of type group 24, 25 are arranged so that types in one row are not aligned vertically with corresponding types provided in the other row. Ink is supplied to each of rows of type group 24, 25 by causing one of ink rollers 22 (22a, 22b), each has a different colored ink, to contact with the row. Printing is made by hitting the type belt against a printing paper 18 mounted on a platen with a hammer 12 which has a height covering all stages and a width corresponding to that of one character.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printer, and particularly to a serial printer capable of multicolor printing.

Conventional printers capable of multicolor printing generally use ink ribbons. For example, a strip of ink ribbon impregnated with different colors of ink on the top and bottom is placed in the printer, and the printing paper is Hit the type with a hammer through the
Some printers print on printing paper, and in this case, switching between ink ribbons of different colors is accomplished by moving the ink ribbon holding frame up and down using an electromagnet or the like.

However, printers using the above ink ribbon require a larger operating force for printing than the ink roller method, which prints by applying ink directly to the type, and therefore the driving source for the printing device is also larger. There is a drawback.

Therefore, using the ink roller method as a printer is effective in terms of miniaturizing the printer, but if you try to apply this to a type belt type printer, the ink roller and the ink from the ink roller will adhere to it. Since the position with respect to the type belt is fixed, when printing on printing paper, it is necessary to take some measures to deal with the need to print the next line after the printing has been completed in a different stone color. For this purpose, type group rows with different inks are formed on one type belt, and this type belt (1) is moved up and down using an electromagnet or the like to move the holding frame (holding frame) up and down to align the type group rows with respect to the hammer. An arbitrary selection method has also been proposed, but this requires a driving device such as an electromagnet as described above to move the holding frame up and down, making the structure of the printer complicated.

In view of the above points, an object of the present invention is to provide a printer that can extremely easily perform multicolor printing.

To achieve this objective, the present invention divides one type belt into a plurality of stages in the vertical direction, and each stage has stones forming a type group row, and each type group row does not overlap in the vertical direction of the type belt. Ink rollers of different colors are provided in contact with each stage, and ink of different colors is applied to the type strings of each stage.
1 and has a height extending over each of the above-mentioned stages, and a hammer having a printing width equivalent to one character.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of the printer. A driving pulley 1 and a driven pulley 2 are arranged at a predetermined interval,
An endless type belt 3 is passed between them. A worm 5 is attached to the rotating shaft of one DC motor 4 serving as a drive source, and the driving force of the motor 4 is transmitted to a main gear 8 via a first idle gear 6 and a second idle gear 7. The rotational force from the main gear 8 is transmitted to the drive pulley 1, and the main gear 8 is capable of meshing with a printing hand raising gear 9.

One end of a printing/carrying shaft 10 is connected to the printing Φ carry gear 9, and this printing/carrying shaft 10 is arranged between the driving pulley 1 and the driven pulley 2, and is parallel to the printing belt 3. It extends to A hammer holder 1 is attached to the print/carry shaft 10.
1 is attached slidably in the axial direction, and the hammer holder 1
1 has a built-in hammer 12, carry, hammer drive cam, etc.
Supported by stones. Further, one end of a holder return spring 13 is connected to the hammer holder 11, and the other end of this holder return spring 13 is fixed to a base 14.

Therefore, the hammer holder 11 is always elastically biased toward the home position of the driven pulley 2 by the tensile force of the holder return spring 13.

A rack 15 is arranged near the print/carry shaft 10 in parallel with the shaft 10, so that the carry/hammer drive shaft cam built in the hammer holder 11 and the rack teeth of the rack 15 can mesh with each other. ing. At the rear of the rack 15, a paper feed roller 216 and a flat guide plate 17 that also serves as a platen are arranged, and the printing paper 18 is sequentially fed out from below the paper feed roller 16 and the guide plate 15, and It is guided near the outside of 3. 19 transfers the rotational force of the main gear 8 to the drive pulley 1 at a predetermined timing.
This selection lever is operated by the electromagnetic solenoid 20, and controls a clutch (not shown) to selectively control the rotation of the DC motor 4 from the main gear. 8"ii is transmitted to the print/carry gear 9. The driven side block 21 is an ink roller that contacts the type part on the outer circumferential side of the type belt 3 and applies ink to the type surface. Attach.

As shown in FIGS. 2 and 3, the type bell) 3U has an endless shape, and a large number of type portions 23 are individually provided along the circumferential direction at a predetermined pitch on the outer circumferential side. The type portion 23 forms two character group rows 24 and 25 in the vertical direction along the circumferential direction of the type belt 3. Each character group row 24.25 is arranged so as not to overlap in the vertical direction of the character belt 3, and each row is provided with a blank portion 40.41 on which no characters are formed. Ink cannot be applied to. Further, on the inner peripheral side of the type belt 3, a large number of belt teeth 26 are provided at a predetermined pitch along the circumferential direction. The individual type portions 23 and the belt tooth portions 26 do not need to face each other, but they are provided at the same pitch so as to be paired with each other, and are adjacent to the type portions 23 (belt tooth portions 26). The printed characters 23 (belt tooth portion 26) are connected to each other by a thin connecting portion 27. These type parts 23
The belt tooth portion 26 and the connecting portion 27 are made of, for example, synthetic rubber or synthetic resin with a low degree of polymerization, and the type belt 3 as a whole has appropriate flexibility, stretchability, and elasticity.

Furthermore, as shown in FIG. 3, the type belt 3 has an upper type group row 24 exclusively for black characters, and a lower type group row 25 exclusively for red characters.
, the upper stage is the roller 22a for black ink, and the lower stage is the roller 22b for red ink, and both rollers 22a, 22
b is rotatably supported on the frame 28, and the type portion 23 of the type group row 24 is attached to the black ink roller 22a.
Further, the type portions 23 of the type group row 25 are brought into contact with the red ink roller 22b to apply ink to the type surface.

The series of basic operations in the above embodiment consists of a character selection operation, a print race carry operation, and a hammer holder return/paper feed operation. Next, the main parts will be explained. As mentioned above, the type belt 3 is hooked between the driving pulley l and the driven pulley 2.
The belt teeth 26 provided on the inner peripheral side of the type belt 3 mesh with the teeth of the driving pulley 1 and the driven pulley 2, respectively, so that the type belt 30 is reliably rotated without slipping.

As shown in FIG. 1, the driving pulley 1 is rotated counterclockwise in the same figure, and the type belt 3 is rotated in the direction of the arrow, and the driven pulley 2 and the driving pulley on the side facing the printing paper 18 are rotated. 1 is the tension p side.

6 and 7 are diagrams for explaining the printing operation,
In the state before printing shown in FIG. 6, the hammer 12 is pulled by the tension spring 2.
9, and is positioned by a stopper (not shown). Therefore, the type belt 3 is located between the partition wall portion 11a of the hammer holder 11 and the extrusion portion 12a of the hammer 12, and is slightly separated from the extrusion portion 12a.

Further, the hammer drive cam 30 faces downward, and the hammer 1
It is not in contact with the second receiving portion 12b. Print/carry axis 10
rotates once in the direction of arrow B by the transmission from the main gear 8, but the printing operation is performed continuously in the first half of the revolution, and the carry operation is performed continuously in the second half of the revolution. During the first half of the rotation, the hammer drive section 30 moves the hammer 12 as shown in FIG.
The hammer 12 is pushed forward against the elasticity of the tension spring 29 by the subsequent rotation of the hammer drive section 30. Then, the selected character portion 23 facing the printing paper 18 is pushed forward by the hammer 12, and is pressed against the printing paper 18 to perform desired printing. This hammer 12 has a height that spans the character group rows of each stage, and is pointed at one intersection point or a red symbol can be selectively printed.
When the carry cam 31 rotates and reaches the second half of the rotation described above, the carry cam (not shown) engages and moves on the rack teeth of the rack 15, thereby resisting the elasticity of the holder return spring 13 and moving the 71 mm holder 11, The hammer 12 and the like can be moved toward the upper digit (to the left in FIG. 1) by an amount equivalent to one digit.

Printing is performed by repeating type selection, printing operation, and carry operation in this way, but when printing an entire line in black or red, the upper type group column 24 or the lower type group column Printing is performed using only column 25.

Then, if the print data of the subsequent line is the same color as the print data of the previous line, the paper is fed for one line by the multiple paper feed operation. The configuration of the paper feeding operation is as known in the art.
A paper feed roller 16 and a driven roller 3 made of rubber or the like
It will be sent in 2.

Also, after printing one line in black, if you want to print the next line in red, for example, in the above embodiment, the lower part of the type belt 3 is a type group row 25 exclusively for red. The printing operation can be immediately shifted from the black printing line to the red printing line without carrying out paper feeding. On the other hand, when it is necessary to print black characters on the next line after the line in which red printing has been completed, 2
All you have to do is feed the paper for each line. In this case, a blank 33 for one line is formed between the red print data and the next black print data.

In the above example, the printing format was explained for one line at a time, but when printing red and black on the same line, black type and red type are printed simultaneously at the required column positions for two lines, and then the next line is printed. It is sufficient to feed the paper by one length and print the necessary black symbols between the red symbols between the lines where only the red characters are printed. In this case, only the two lines are not printed simultaneously at the beginning, and printing is performed using only the character group column 24 for black symbols.

The present invention has the above-described configuration, and makes it possible to provide a printer that can print in multiple colors much more easily than conventional printers.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the printer viewed from above, Figure 2 is a plan view of the type belt, Figure 3 is a perspective view of the type belt, and Figures 4 and 5 are the type belt and ink roller. Figures 6 and 7 are side views of the printing section to explain the printing operation, and Figures 8 and 9 are the relationships between the hammer, type section, and printing paper during printing. FIG. 10 is an explanatory diagram showing characters printed on printing paper. 3... Type belt, 18... Printing paper,
22... Ink roller, 24.25...
・Type group column. Figure 4 Figure 5 Figure 8 Figure 9 Porridge Figure 10 However/

Claims (1)

[Claims] One type belt is divided into a plurality of stages in the vertical direction, and each stage is arranged with stones forming a type group row in the vertical direction of the type belt, and each type group row is arranged so that it does not overlap once in the vertical direction of the type belt. Correspondingly, stone ink rollers of different colors are provided in contact with each other so as to apply different colors of ink to the character rows in each row, and have a height extending over each row, and have a height corresponding to one character. A printer characterized by being provided with a hammer having a printing width.