JPS6299181A - Underline printer - Google Patents

Abstract

PURPOSE:To uniformize the alignment with respect to vertical and horizontal directions of underlines printed on a printing surface, by printing an underline through selecting a specified type position other than an underline type, when printing an underline. CONSTITUTION:When printing 'underlined A', a type of A in a daisy wheel is first selected by a type-selecting motor 1, and the type of A is struck by a hammer 6 to print the character A. Next, a specified type next to an underline type is selected, and after a momentary stop, the type of 'underline' is selected, and is struck by the hammer 6 to print an underline. Accordingly, since the positional relationship between a hole in the daisy wheel and a projection on a holder is uniformized, a beautiful underline printing can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an underline printing device for an electronic typewriter.

BACKGROUND OF THE INVENTION In recent years, electronic typewriters have become increasingly computerized, and higher printing quality is desired.

A conventional underline printing device will be explained below.

FIG. 4 is a sectional view of the main parts of a conventional underline printing device, in which 1 is a type selection motor and 1a is a motor shaft. 2 is a boulder having a protrusion 2a at its tip, and the holder 2 is attached to the motor shaft 1a. Reference numeral 3 designates a daisy wheel having a typeface at the tip of spokes attached radially, and a hole 3a that fits into a protrusion 2a. Protrusion 2a of holder 2 and hole 3a of daisy wheel 3 to damp vibration of daisy wheel 3
There is a clearance between the two.

4 is a leaf spring that presses the daisy wheel 3 against the holder 2, 5 is a platen, and 6 is a hammer that performs impact printing of the characters on the daisy wheel 3 from behind and prints on the printing paper wound around the platen 5. In addition, a keyboard for input and a control circuit for controlling the type selection motor 1 and the hammer 6 are necessary components, but are not shown.

The operation of the underline printing device configured as described above will be explained below.

FIG. 5 is an operation flowchart when the same device prints rAJ (A underline). When printing "person", first in process 11, the character selection motor 1 selects "A" from the daisy wheel 3. A printed character is selected, and in step 12, the printed character "A" is struck with a hammer 6 to print. Next, in process 13, the character "-" (underline) on the daisy wheel 3 is selected by the character selection motor 1, and in process 14, the character "-" is struck with the hammer 6 to print.

Problems to be Solved by the Invention However, in the conventional configuration described above, when printing an underline, the daisy wheel 3 rotates from the previous printed character to the underlined character; Since the angles are different, holder 2
Due to the clearance between the protrusion 2a of the daisy wheel 3 and the hole 3a of the daisy wheel 3, the stopping position of the underline type with respect to the hammer 6 is not constant. There was a problem in that printing quality deteriorated due to deviation in the direction and left and right directions.

Means for Solving the Problems In the present invention, when printing an underline, a specific position other than the underline type is selected, and then the underline type is selected and printed.

According to the present invention, with the above-described configuration, the stopping position of the daisy wheel typeface during underline printing approaches a constant position, so that the vertical and horizontal alignment of the underline on the print face can be made uniform.

Embodiment FIG. 1 is a functional block diagram of an underline printing device in an embodiment of the present invention, in which 1 is a type selection motor, 2 is
3 is a holder, 3 is a daisy wheel, 4 is a leaf spring, 5 is a platen, and 6 is a hammer, and since these are similar in structure to the conventional example, they are given the same numbers and their explanation will be omitted. 15 is a keyboard for inputting print data; 16 is a character identification means for determining whether the print data is an underline; and 17 is a character identifying means for determining whether the print data is an underline; after first selecting a specific position on the daisy wheel; Underline processing means 18 controls the type selection motor and the hammer so as to select the printed characters on the line and perform impact printing; 18 is a hammer driving means 19 that drives the hammer 6 in accordance with the output of the underline processing means 17; is a type selection motor driving means for driving the type selection motor 1 in accordance with the output of the underline processing means 17.

FIG. 2 is a control block diagram of the underline printing device in this embodiment. 20 is a control circuit, and the control circuit 20 has a microcomputer. 30 is a read-only memory (hereinafter abbreviated as ROM), 31 is a random access memory (hereinafter abbreviated as RAM), and the control circuit 20 uses the program stored in the ROM 30 and RAM 31 to perform the character identification means shown in FIG. 16
The operations of the underline processing means 17, the hammer drive means 18, and the type selection motor drive means 19 are realized.

The operation of the underline printing device configured as described above will be explained below.

FIG. 2 is an operation flowchart when the underline printing apparatus of this embodiment prints "person". First, in step 21 in FIG. 2, the letter "A" on the daisy wheel 3 is selected by the letter selection motor 1, and in step 22, impact printing is performed with the hammer 6. Next, in process 23, select a specific type next to the underlined type and stop once, then in process 24
Select the "-" (underline) character with , and process 25.
Perform impact printing using hammer 6.

In this embodiment, a keyboard is used as an input means, but this can also be realized with a storage device using a magnetic disk, magnetic tape, etc., or with an interface for inputting print data from another device. be.

Effects of the Invention In the present invention, when printing an underline, the daisy wheel stops at a specific position before selecting the underline, and then selects the underline and performs impact printing. Since the positional relationship is made uniform, it is possible to realize an excellent underline printing device that can realize beautiful underline printing.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram of an underline printing device according to an embodiment of the present invention, Fig. 2 is a control block diagram of the same, Fig. 3 is an operational block diagram of the same device, and Fig. 4 is a conventional underline printing device. FIG. 5 is a sectional view of a main part of the apparatus, and FIG. 5 is an operational block diagram of the apparatus. ■...Type selection motor, 3...Dizzy wheel,
6... Hammer, 15... Input means, 16... Character identification means, 17... Underline processing means, 1
8...Hammer drive means, 19...Type selection motor drive means Name of agent: Patent attorney Toshio Nakao, 1 person (
0'S- Figure 4 Figure 5

Claims (1)

[Claims] A daisy wheel in which type is arranged radially, a hammer for striking the type to print, a type selecting means for rotating the daisy wheel, a means for inputting print data, and a means for inputting print data, and determining whether the content of the print data is an underline. character identification means for determining, and when the content of the print data is an underline, once the rotation of the daisy wheel is stopped at a position near the underline type, the underline type is selected and impact printing is performed. Underline processing means for controlling the type selection means and the hammer; hammer driving means for driving the hammer in response to the output of the underline processing means; 1. An underline printing device comprising: a type selection means driving means for driving said type selection means.