JPS5863481A - Printer - Google Patents

Abstract

PURPOSE:To enable to use different type wheels provided with a plurality of type groups, by providing a first memory region storing character information corresponding to a given type group and a second memory region storing character parts which are not in common with the given type group. CONSTITUTION:Each of ROM1-ROMn is used as a converting table for character codes, and character codes different for each of (n) producers of the type wheels are respectively registered in ROM2-ROMn. When a type group other than a given type group is designated, a common part of character information is read from ROM1, while the parts of the character information other than the common part are read from the memory region corresponding to the type group designated, and printing is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and particularly to a printing device that can use a plurality of typefaces (typewheels) and reads and prints corresponding character information according to manual keystrokes.

Such printing devices are used, for example, in electronic devices such as electronic typewriters, and the type wheels used therein are manufactured and provided by each manufacturer, but conventional printing bag devices use type wheels made by the same manufacturer. In addition, if a type wheel is intentionally used with a different typewriter, the problem arises that correct printing may not be possible due to a mistake in setting the type wheel.

Further, in an electronic typewriter equipped with a display device, there is a problem in that the printed characters and the displayed characters are different.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a printing device which obviates these conventional drawbacks and which makes it possible by simple means to use different type wheels with a plurality of type groups.

In order to achieve this object, the present invention has a first storage area that stores character information corresponding to one of a plurality of character groups, and a second storage area that stores character information that is not common to that one character group. When a character group other than one character group is specified, the common part is stored from the first storage area, and the characters other than the common part are retrieved from the second storage area corresponding to the specified character group. We adopted a configuration that reads and prints information.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a system configuration diagram of an embodiment of a printing device according to the present invention, where 10 is a microprocessor (MPU) that monitors control of the entire system, and 12 is an external input means to this printing device. It is a keyboard (KB) with multiple keys installed, and all key manual command signals from this KB 12 are sent to the keyboard controller (KBC) 14.
MPUl0 through data bus (DB) 16a
is configured so that it can be received. Reference numeral 18 denotes a random access memory (RAM), which also includes a character buffer memory (not shown) for temporarily storing discontinuous signals from the KBC 14 and flag registers (not shown) for indicating the status of the system. Further, 20 is a read-only memory (ROM), and the ROM (1') indicated by 20a stores character information corresponding to a group of characters provided on a type wheel provided by a certain basic manufacturer. For example, as shown in FIG. 2(A), 96 types of printed characters are stored corresponding to internal codes. The other ROM(2) to ROM(n) indicated by 20b and 20C each have type groups provided by other manufacturers, including 1 (OM(1) 20
Each of the printed character parts that are not common to the printed character group stored in a is stored. For example, the ROM(n) 20C does not store the common parts marked with diagonal lines among the characters provided by other manufacturers as shown in Figure 2 (B).
Information corresponding to the remaining 10 types of printed characters from A87 to A96 is stored. Therefore, each ROM(1) to RO
M(n) is the character code conversion table and RO
In M(2) to ROM(n), different character codes are registered for each of the n manufacturers.

The KBC 14 is also provided with a type information register (WREG) 14a that stores type information regarding the type wheel currently installed in the printing device.

ROM (1) indicated by 213-21C mentioned above
~ROM(n), address information is sent from the MPU 1Q to the address bus (AB) 16b by the DBi 5a, and this AB 16b is a memory decoder (MAD) 2.
Connected to 2. With this configuration, MPUIQ
is the type wheel information register built into KBC14■
(By referring to EGl4a, each ROM2 is selected using selection signals 5EL1 to SELn through MAD22.
Any one of 0a to 20C can be selected. Also, system control path (80B) 16C
is connected to each of the ROMs 20a to 20C and the RAM 18, and this 5CB 16C provides timing for reading each of the ROMs 203 to 20c, timing for writing to or reading from the RAM 18, and the like. This MPU
10 can freely sequentially write or read input signals from the KBC 14 to the RAM 18, and if continuous signals are input from the KBC 14, it can be written continuously, and if there is no input signal, it can be read continuously, etc. It is possible to perform processing according to the signal.

In this case, when the MPUIQ converts the input signal from the KBC14 into a character code, it simultaneously obtains the wheel information from the W master 4a and sends it to the ROM(1) to ROM( n
) is retrieved as an address and converted into a proper internal code. In this case, as described above, ROM(2) to ROM(n) include ROM(1
), only characters in a range that is different from the character group registered in ROM (1) are registered, so the internal processing of MPU1Q is based on the character group registered in ROM (1) using the signal from KB12 at 1 o'clock. Convert to character code ■mG
Indicates that the wheel information in 14a is different from that character group, and only when a character other than the common part is selected, the conversion code is invalidated and the ROM (2) indicated by WREG is again executed.
The table in ROM(n) is referred to and reconversion is performed.

In addition, in controlling the output device, the printer section (PRT)
24 is a printer interface (PIF) and 26 is a printer driver (PDV) 2B. The information that MPUIQ gives to PIF26 is character code converted from keyboard input signal to internal code.
horizontal direction, [+] direction movement amount, [-] direction movement amount (
Here, the right direction is [+] and the left direction is [-]) or the amount of vertical movement (in this case, the forward direction of paper feed is [+]).
], and the opposite direction is [-]). In addition, this l0AD is an input/output address decoder (IOAD).
Selection signal from 30 8EL n + 1.8EL n
+2, the address assigned to the KBC 14 and PIF 26 can be selected. In addition, these KBC14 and PIF26 have DB15a and 5C.
Since B15c is connected, KB is sent by MPU1Q.
C14 and PIF'26 can be controlled arbitrarily.

Next, let us take the type wheels provided by Manufacturer (1) and Manufacturer (n) as an example. For example, as mentioned above, the type wheels corresponding to the type wheels of Manufacturers (1) and (n) are shown in Figure 2 (A ) and (B), the characters A1 to 86 in each wheel are the same, while &87 to &% are different, so only that part is registered in the ROM(n).

Here, if the keyboard is compatible with type wheel manufacturer (1), and if you press the key corresponding to the type character "■" in &87, if the type wheel is manufacturer (1), "■" will be printed. However, if the type wheel is made by manufacturer (n), as mentioned above, WREG 14
ROM(n) is selected based on the information in a, and the internal code becomes 8A, and the characters "TMJ" are selected and printed as shown in FIG. 2(B).

Furthermore, even when a display device is used, code conversion can be performed for display so that the printed and displayed characters can be the same.

As explained above, according to the present invention, there is a first storage area that stores character information corresponding to one of a plurality of character groups, and a first storage area that stores character information that is not common to that one character group. 2 storage areas are provided, and when a character group other than one character group is specified, the common part is retrieved from the first storage area, and the characters other than the common part are retrieved from the second storage area corresponding to the specified character group. Since it uses a configuration that reads and prints information,
Various type wheels can be easily used interchangeably, thereby preventing printing and display errors. Further, since only the different parts that are not common parts are stored in the second storage area, various effects such as being able to reduce the storage capacity can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a printing device of the present invention;
Figures 2 (A>, (B) are explanatory diagrams showing conversion tables for different character groups. 10... microprocessor, 12...
・Keyboard, 14... Kiniboard controller, 14a... Type wheel information register, 1
8...Random access memory, 20.20a
~20C...Read-only memory, η...
...Memory address decoder, 24...Printer section, 26...Printer interface, 2
8... Printer head, concave... Input/output address decoder 45 Figure 2 (A) (B)

Claims (1)

[Claims] Key: In a printing device that performs a printing operation by reading out character information from a storage section that stores character information based on human power, the storage section has a first storage area that stores character information corresponding to one group of characters, and a first storage area that stores character information corresponding to one group of characters; A second storage area is provided for each type group to store character information that is not common to the one type group, and when a type group other than the one type group is specified, the common part is stored from the first storage area. Further, a printing device is characterized in that character information other than common portions is read out from a second storage area corresponding to a designated group of characters and printed.