JPS60141581A - Serial printer - Google Patents

Abstract

PURPOSE:To enable sagging of an ink ribbon due to vibrations on an action or the like to be always eliminated, by a method wherein an ink ribbon is re-fed by a predetermined amount after a type wheel shifting action or an ink ribbon lifting action. CONSTITUTION:After printing, the carrier is moved by a spacing motor 23 in response to a printing signal from a printing-controlling part 21 for the subsequent printing, a type of the type wheel is selected by a type-selecting motor 22, and the ink ribbon is fed by a predetermined amount by an ink ribbon feeding motor 26. In this case, when a type wheel shifting action by a magnet 24 or an ink ribbon lifting action by a magnet 25 is performed, the motor 26 is rotated by a signal from a discriminating part 27 to feed the ink ribbon further by a predetermined amount, when a stable condition is obtained after the action. Accordingly, it is possible to prevent printing of broken characters or nonuniform printing due to sagging of the ink ribbon, catching of the type wheel by some part or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION (al) Technical Field of the Invention The present invention relates to a serial printer, and more particularly to an improvement of an ink ribbon feed mechanism of a type serial printer having a type head shift mechanism, an ink ribbon lift mechanism, etc. It is.

(b) Background of the technology There are various printing methods known for type serial printers depending on the shape of their printing mechanism, and type wheel printers that incorporate integrated circuit technology and motor control technology are the mainstream. ing.

However, the type head with two levels of type, the red color,
In the above-mentioned printer using an ink ribbon consisting of two colors of black, when the type head performs the shift 1 operation or the ink ribbon refresh 1 operation, the ink ribbon force center vibrates and the ink ribbon becomes slack. , there is an inconvenience that defects may occur in subsequent printing, and there is a need for a method to eliminate slack in the ink ribbon.

(C) Prior Art and Problems For example, in the type wheel type serial printer described above, as shown in FIG.
A disk-shaped type wheel 4 (type head), which has a large number of fingers and has type at its tip in two stages, upper and lower, faces a platen 1 with a capacity of 1J, and is rotatable so that it can be lifted up and down. Installed this type wheel 4
A carriage 2 to which a hammer unit 5 is attached is disposed behind the platen 1 so as to be movable in the left-right direction along a guide shaft 3 disposed parallel to the platen 1 via a drive mechanism (not shown). Further, above the carriage 2, there is disposed an ink ribbon cassette 6 containing a two-color ink ribbon 7 whose upper half in the width direction is black and whose lower half is red. The ink ribbon 7 stored in the cassette 6 is fed between the type portion of the type wheel 4 and the printing paper 8 by a feed roller 6a connected to the shaft of a ribbon feed motor (not shown) provided on the carriage 2. At the same time, by energizing or de-energizing a ribbon lift magnet (not shown), the cassette 6 can be lifted up and down, making it possible to selectively use black or red ink ribbon for printing as necessary. There is.

When printing, the carriage 2 is moved along the guide shaft 3 to determine the printing position, and the disc-shaped type wheel 4 is rotated in response to a printing signal to selectively place the desired type at a predetermined printing position. By operating the hammer unit 5 with respect to the printed characters, desired characters are printed on the opposing printing paper 8 via the desired ink ribbon 7. After printing, a printing process is used in which the ink ribbon 7 is fed by a predetermined amount and then the printing starts.

However, in such conventional serial printers, after printing, the ink ribbon 7 is moved a predetermined distance before starting the next printing, and the ink ribbon 7 is lifted to change the color, or the type wheel 4 is shifted. When the ink ribbon cassette 6 vibrates when the ink ribbon cassette 6 is operated, that is, the upper and lower character rows provided in the upper and lower rows are selected, the ink ribbon 7 facing the printing paper 8 becomes slack, and printing is performed in this state. This has the disadvantage that printed characters may be missing or missing, and furthermore, the printed characters may get caught on the ink ribbon 7 when selecting the printed characters.

(dl) Purpose of the Invention In view of the above-mentioned conventional circumstances, the present invention is designed to constantly eliminate slack in the ink ribbon caused by the color change lift operation of the ink ribbon or the shift operation of the type wheel during the printing process before the next printing. The purpose is to provide a new serial printer that enables high-quality printing.

According to the present invention, there is provided a rotatable platen on which printing paper is guided, and a carriage that faces the platen and is movable in the axial direction of the platen via an ink ribbon. , a printing section consisting of a type head' and a printing hammer mounted on the carriage, and an ink ribbon interposed between the printing section and the platen, and the printing section prints on printing paper. Then, in a printer that feeds a predetermined amount of ink ribbon, after feeding the ink ribbon by a predetermined amount, when at least one of a type head shift operation or an ink ribbon lift operation is performed, the ink ribbon is further fed by a predetermined amount. This is achieved by providing a serial printer characterized by:

(fl Embodiments of the Invention Below, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the printer 1 control circuit of the serial printer according to the present invention, and FIG. 3 shows an embodiment of a time chart of the printing process in the serial printer according to the present invention.

In FIG. 2, in box A, 2I is a print control section which receives print data from the Gita processing device and instructs each print driving section of the printer to print the data. Reference numeral 22 denotes a type selection motor, which rotates a print head such as a type wheel on which type is arranged on the circumference in response to a print signal to select and arrange the type to be printed at a printing position. A spacing motor 23 moves the carriage on which the print head is mounted to the right or left along the rotation axis of the platen for each print. 24 is a type head shift magnet, which, when energized or de-energized, shifts the type wheel, in which type is arranged in two stages on the circumference, downward by one point to select the upper and lower character rows. .

Reference numeral 25 denotes an ink ribbon lift 1-magnet, which when excited pushes the ink ribbon cassette upwards and presses the red ink ribbon part of the ink ribbon in the cassette, the lower half of which is red and the upper half of which is black, into a printing hammer. to face. 2G is the ink ribbon feed motor,
The ink ribbon in the ink ribbon cassette is fed by a predetermined amount each time printing is completed, and in response to the next print signal received by the print control unit 21, the determination unit 27 shifts the type wheel or moves the ink ribbon. The presence or absence of the vertical lift operation is determined, and only when these operations are present, the ink ribbon is further fed by a predetermined amount.

However, in order to operate the printer using such a print control circuit, as is clear from the operation time chart shown in FIG. All at once,
For example, the carrier is moved by a spacing motor 23. Type Select I-Motor 22 rotates the type wheel to select type. The ink ribbon feed motor 26 is driven by the ink ribbon feed signal to feed the ink ribbon by a certain amount.

Here, when a shift operation of the type wheel and a lift operation of the ink ribbon are performed based on the print signal from the print control unit 21, the print signal is determined by the determination unit 27, and at the point when it becomes stable after these shift operations. The determining section 2
The slack ribbon correction feed signal B from 7 rotates the ink ribbon feed motor 26 to further feed the ink ribbon by a predetermined amount. After that, the printing operation starts.

However, if there is no type wheel shift operation or ink ribbon sliding operation, the transition from T1 to T in Figure 3
As shown in period 2, re-ribbon feeding (loose ribbon correction feeding) of this ink ribbon is not performed.

fg) Effects of the Invention As is clear from the above explanation, according to the serial printer according to the present invention, a predetermined amount of re-ribbon feeding is always performed after the shift operation of the type wheel or the lift operation of the ink ribbon. The slack in the ink ribbon caused by the vibrations caused by the shift operation of the type wheel or the lift operation of the ink ribbon is completely eliminated before the next printing, thereby preventing missing prints, uneven printing, or loose ink ribbons being caught by the type wheel. This has the effect of preventing JJI calculations and improving print quality. Therefore, it is extremely advantageous to apply it to various serial printers.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view for explaining a conventional type wheel type serial printer, FIG. 2 is a block diagram showing an embodiment of the printer l-control a11 circuit in the serial printer according to the present invention, and FIG. 3 is a time chart for explaining the printing operation of the serial printer according to the present invention. In the drawing, 21 is a print control unit, 22 is a type select motor, 23 is a spacing motor, 24 is a type head shift magnet, 25 is an ink ribbon lift magnet, 26 is an ink ribbon feed motor, 27 is a determination unit, and A is an ink Ribbon feed signal, B indicates slack ribbon correction feed borrow. Figure 1 3 2nd leap figure 3

Claims (1)

[Claims] A rotatable platen on which printing paper is guided, a carriage facing the platen and movable in the axial direction of the platen via an ink ribbon, and a type head and print characters mounted on the carriage. The printer is composed of a printing section consisting of a hammer, and an ink ribbon interposed between the printing section and the platen, and feeds the ink ribbon by a predetermined amount after the printing section prints on printing paper. A serial printer characterized in that after a predetermined amount of ink ribbon is fed, at least one of a type head shift operation or an ink ribbon lift operation is performed, and then a predetermined amount of ink ribbon is further fed.