JPS6058882A - Printer - Google Patents

Abstract

PURPOSE:To print with high quality at high speed, by providing a micro-proces- sor, a ROM and a RAM at each of a key-inputting part and a printing part. CONSTITUTION:The key-inputting part comprising a keyboard unit KBU is provided with a micro-processor MPU1, ROM1 and RAM1, while the printing part comprising a type wheel PW and a printing hammer HM is provided with a micro-processor MPU2, ROM2 and RAM2, and both of the systems are connected to each other by an interface ITF. A type wheel table WT is stored in the ROM1, and a printing pressure table IT is stored in the ROM2. Accordingly, control is simplified, and operation is made to be secure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a printing device, and particularly to control of a key manual section and a printing section thereof.

[Objective] An object of the present invention is to provide a printing device that can perform high-quality printing at high speed by solving the drawbacks of the conventional technology in this type of device.

That is, the present invention includes a microprocessor and a read-only memory in the key input section and the printing section, respectively.

The purpose is to ensure reliable control by providing a random access memory.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of the printing apparatus of the present invention, where KBU is a keyboard unit, Bl and DB2 are system data/kus, MPU 1 and M
PU2 is a microprocessor, ABI and AB2 are system address nodes, ADI and AD24t address decoders, ROM 1 and ROM2 are read-only memories, RAM 1 and RAM 2 are random access memories, ITF is Inter 7x, 5ELII, 5
EL12°5EL21, 5EL22, 5EL23 and 5EL24 are device select lines. Ml and M2 are servo motors for carriage and type wheel drive respectively, PTM is a programmable timer, OLD
is the carriage control and drive unit, WL, D is the type wheel control and drive unit, pw is the type wheel, HM is the type hammer, 1 (MO is the print hammer drive unit, RB is the print ribbon, PAP is the print paper, PS is the print This photo sensor is composed of a light emitting diode, a photo diode, and a photo encoder that output various outputs according to the rotation of the wheel Pw.

The system in Figure 1 can be roughly divided into two systems: MP
It consists of an I side and an MPU2 side, and both systems are connected by an interface ITF. Microprocessors MPUI and MPU2 each form the core of both systems and are provided with means for performing calculations and control. The microprocessors IPUI and MPU2 also connect the memories ROMI, RAMI, ROM2 . The address can be sent to RAM2, and the address information decoded by address decoders MDI and AD2 can be sent to each device ITF, KBU, PTM, LD, and C1, D via device select lines 5ELII-9EL24, and the required device be able to select.

The memories RO and ROM2 store instructions and fixed information for sequentially controlling or calculating the microprocessors MPUI and MPU2, respectively. In the memories ROM1 and ROM2 shown in FIG.
stores the code table 0 for code conversion and the type wheel table WT as the type position information for the type wheel, and the memory ROM2 stores the printing pressure table IT as the printing pressure information and the printing hammer driving time information. Store the time table TT. Note that printing pressure here means energy related to printing, and hammer I
N (7) By making the driving time variable, the printing energy is changed for each character, thereby changing the printing pressure.

Memories RAMI and RAM2 are used for temporary storage of information necessary for processing within the system, the specific contents of which will be described later. Keyboard KBUjt, slide switch IM for pressing keys such as alphanumeric keys or adjusting printing pressure
In response to the movement of the PSW, the data of the pressed key or the movement data of the switch is sent to the microprocessor MP via the bus DBI. Note that key press data can be extracted by positioning the rows and columns of the key matrix to the upper and lower 4 bits of the 8 bits. Address decoders MDI and AD2 are connected to address buses ABI and AB2 consisting of a plurality of address lines.
The information in the only signal line 5ELI for each device
Activate I etc. Interface ITF is M
The PUI side data bus l1llBl and the HPυ2 side data bus DB2 are connected, and the microprocessor MPUI can be accessed by the select line SEI, 11, and the microprocessor MPU can be accessed by the select line 5EL21.
2 can be accessed.

The carriage control and drive unit CLD is a type wheel that starts operating by receiving carriage position information from the microprocessor MPU2, controls and drives the servo motor M1, and moves the carriage to the relevant position and stops there. The control and drive unit WLD also starts its operation by simultaneously receiving target rotation position information on the type wheel PW from the microprocessor MPU2, controls and drives the servo motor M2, and rotates the type wheel PW to the target rotation position. movement and stop there. At the same time, the type wheel control and drive unit WLD can notify the microprocessor MPU2 that the rotational movement has stopped. The output line of the timer PTM becomes active when a time constant is written therein by the microprocessor MPU2, and becomes inactive when the written time elapses. The output line of the timer PTH is connected to the hammer drive unit) IMO, and the output line of the timer PTH
A drive current is supplied to the hammer HM for a predetermined period of time.

As a result, the hammer HM is biased in the direction of the arrow shown in the first figure for a predetermined period of time, and the printing ribbon R is pressed against the paper PAP.
One type of character on the type wheel Pw is pressed against it via B, and the character is transferred onto the paper PAP. The type wheel PW is provided with one, for example, 86 type spokes, and a type is arranged at each tip.

Next, the operation of the printing device shown in the first diagram will be explained with a focus on the microprocessors MPUI and MPU2. At power-on, microprocessors MPUI and MPt12 are activated independently. First, type wheel control and drive unit W
In response to a command from the microprocessor MPU2, the LD rotates the type wheel pH once, detects the typeface of the printed characters mounted thereon, and notifies the microprocessor MPU2 of the detected typeface. For example, when the font is "PICA", the number II 2 I+ is the type wheel control and drive unit WL.
D to the microprocessor MPU2. The microprocessor PO2 sends the value H2#T to the microprocessor MPUI via the interface ITF. When the microprocessor MPU 1 learns that the information has been transferred from the microprocessor MPU 2, it sends data regarding the font from the interface 17F.
get pa. The microprocessor MPUI stores this data '2' in the memory RA as data representing the type of font.
After writing to the storage part KINO on MI, the microprocessors MPUI and MPU2 perform the sequence of FIG.
When a key is pressed on the keyboard, the character code corresponding to the pressed key is sent to the microprocessor MPI, ! For example, if the character of the pressed key is A' (7), the character code is °'41" HEX
There is -7'. Based on the obtained character code, the microprocessor MPU2 refers to a printing pressure table IT as shown in FIG. 5 to obtain printing pressure information corresponding to the character code. This printing pressure information is, for example, = 1 for the character 'A', and the microprocessor MPU 1 obtains the character position by referring to the character wheel table WT as shown in FIG. 4 based on the character code. . Then, the information on the obtained print position is sent to the microprocessor MPU2. This character position information is, for example, 45 for the character "A'." In other words, the character 'A' is at the 45th print position.

The microprocessor MPU2 stores the printing pressure information at a position advanced by the number taken from the head of the printing pressure table IT2 in the memory RAM2 with respect to the character position. In other words, in the case of the character ``A'', the printing pressure ``°3'' is stored at the 45th position from the first address of the printing pressure table IT2. A sequence of 0 or more in which a second printing pressure table corresponding to the character position is obtained in the printing pressure table JT2 of the RAM 2 is the sequence when the power is turned on.

Now, when a character key on the keyboard KBU is pressed,
The character corresponding to the pressed character key is printed on the printing paper PAP according to the sequence shown in FIG. That is, obtain the key matrix α information on the keyboard KBU (for example, °·10"HEX for the character "A') and store this in the area KIIIRX.
In RX, the key matrix α information is converted into a character code. At this time, code table 0 of memory ROMI
A knife is used. The converted character code (character ``A'' is ``41'' HEX) is stored in the area KCODE,
Next, the character position (45 for the character 'A') is obtained from the character code stored in the area KCODE while referring to the character wheel table WT. This character position is temporarily stored in the area wpos of the memory RAMI and sent to the microprocessor υ2. Microprocessor MPt12
stores the received type position information in the area WP of memory RAM2.
O5, and the type wheel is rotated to a desired position and stopped based on the type position information from this area wpos. After that, referring to the printing pressure table I-2 of the memory RAM 2 regarding the printing information from the area wpos of the memory RAM 2, the printing pressure information of the corresponding type (character ``A'' is 3) is obtained, and this is stored in the memory RA) l. It is stored in area BF of 1.

Memory ROM based on printing pressure information stored in area BF
As shown in FIG. 6, /\timer driving time information (letter ``A'' is 311100) is obtained from the time table TT of No. 2, and that value is set in the programmable timer No. 2 N. The programmable shutter 412X drives the hammer HM for a predetermined time based on the set time information. When the hammer drive is finished, the carriage is moved a predetermined amount and then ready for the next printing.

[Effects] As is clear from the above, according to the present invention, two microprocessors, a read-only memory, and a random access memory are provided in each of the key input section and the printing section, and one@
Since the type wheel table is prepared on the first microprocessor side and the printing pressure table is prepared on the second microprocessor side, it is easy to control them, reliable operation can be expected, and high-speed printing can be achieved. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the power-on sequence, FIG. 3 is a flowchart related to printing, and FIGS. FIG. 4 is a diagram showing specific examples of various tables shown in the figure. KBU...keyboard unit, DBI, DB2...system data bus, MPUI,
HPυ2...Microprocessor, ABI, AB2
...System address bus, ADl, AD2... Address decoder, ROW 1, ROM2... Read only memory, RAMI, RAM2... Random access memory. ITF...Interface, 5EL11, 5EL12, 5EL21, 5EL22゜5
EL23,5EL24...Device select line,
Ml, M2... Servo motor, PTM... Programmable timer, CLD... Carriage control and drive unit. %1lLD...Type wheel control and drive unit, pw
...Type wheel, HM...Print hammer, HMD...Print hammer drive unit, RB...Print ribbon, PAP...Print paper, ps...Photo sensor. Patent applicant Canon Co., Ltd. Figure 3

Claims (1)

[Scope of Claims] A key input section, a printing section, a first microprocessor corresponding to the key input section, a first read-only memory, a first random access memory, and a first microprocessor corresponding to the printing section. a second microprocessor, a second read-only memory, a second random access memory, and an interface connecting the first and second microprocessors, the first read-only memory having at least a type wheel table; , and at least a time table and a printing pressure table are stored in the read-only memory of the rlIJ2. (Hereafter, margin)