JPS6270056A - High-speed printing apparatus in dot type serial printer - Google Patents

Abstract

PURPOSE:To enable a high-speed printing, by a method wherein a CPU which receives printing data from a host unit and transforms it into a dot-pattern for writing in a memory is actuated simultaneously with a CPU which shares the memory and reads the written dot-pattern to control the action of mechanism portions. CONSTITUTION:When a CPU 1 selects a read/write memory 5 according to a memory switching signal 2, an address selector 3 connects the address bus of the CPU 1 to the read/write memory 5 and release the address bus of a CPU 11 from the read/write memory 5. On the other hand, according to the memory switching signal 2, a data bus buffer 7 opens and the data bus of the CPU 1 is connected to the read/write memory 5 as well as the CPU 1 is perfectly disconnected from a read/write memory 6 and writes the dot-pattern in the read/write memory 5. Upon completion of writing, the CPU 1 switches over the memory switching signal 2. The CPU 11 opens a buffer 8 according to a data bus buffer switching signal 12 and connects the data bus thereof to the read/write memory 5 to read the dot-pattern, thus controlling mechanism portions 14-16 according to the data of dot-pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot type serial printer, and particularly to a print data processing device.

[Conventional technology]

Conventionally, a dot-type serial printer receives print data from a host device using one CPU, develops the data into a tone pattern, and prints by operating each mechanical section based on the dot pattern or turn.

[Problem that the invention seeks to solve]

The conventional dot serial printer mentioned above has one CP.
Receives print data from the host device at U and sends the data to dotno'? Because the printing was performed by controlling the mechanism based on the dot pattern, the print data of the next line could not be developed into the dots or turns until printing of the - line was completed, and this print data could not be processed. Since the printing operation is temporarily stopped during the printing process, there is a drawback that the overall printing speed decreases.

The present invention solves the above problems and provides a printing device that increases printing speed.

[Means for solving problems]

The high-speed printing device for a dot-type serial printer of the present invention includes a first CPU that receives print data from a host device, develops the data into a dot pattern, and writes it into a memory;
The second CPU reads dot patterns and turns from the memory, and controls the horizontal feed of the print head, the paper feed, the excitation mechanism of the print head, etc. based on the read results, and the two CPUs share the dot pattern or write the dot pattern. It is characterized by having two memories that can be read.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention. The device of the present invention receives print data from the host device 13, develops the data into a dot pattern, and reads/writes the data into the read/write memory 5. or 6, the first CPUI to write K;
It consists of a second CPU II which reads dots and turns from the read/write memory 5° or 6, and controls the horizontal feed of the print head, paper feed, and excitation mechanism sections 14 to 16 of the print head based on the data.

First, the CPU selects either read/write memory 5 or 6 using memory switching signal 2. For example, if the read/write memory 5 is selected, the address selector 3 connects the CPUI address bus to the read/write memory 5, and connects the CPUII address bus to the read/write memory 5.
Release from. The simultaneous address selector 4 releases the CPUI address bus from the read/write memory 6, and
Connect the UII address bus to the read/write memory 6. In addition, the data bus buffer 7 is opened by this memory switching signal 2, and the data bus of the CPU 1 is connected to the dry memory 5. At the same time, the buffer 9 is closed and the data bus of the CPU 1 is released from the read/write memory 6. In this state, the CPUI is completely disconnected from the read/write memory 6 and writes a dot pattern into the read/write memory 5. After writing is completed, the CPU switches the memory switching signal 2, and contrary to the above, disconnects the address, bus, and data bus from the read/write memory 5, connects it to the read/write memory 6, and starts the doratono and turn of the next print line. The operation of writing to the read/write memory 6 begins.

After confirming that the CPU II has written a dot in the read/write memory 5 and released the address bus and data bus from the read/write memory 5 using the memory switching signal 2, the CPU II switches the memory using the data bus buffer switching signal 12. Open the buffer 8, connect the CPU II data bus to the read/write memory 5, close the buffer 10, release the read/write memory 6, read the dot pattern from the read/write memory 5, and based on the data, print the dot pattern next to the print head. It controls the mechanical units 14 to 16 such as feeding, paper feeding, and excitation of the print head.

〔Effect of the invention〕

As explained above, the present invention receives print data from a host device, develops it into a dot pattern, and writes it into memory.
The effect of high-speed printing is achieved by operating two CPUs at the same time: the PU and the CPU that shares the memory, reads the written dot pattern, and controls the operation of the mechanism based on that data, and processes the print data. There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of the present invention. 1...CPU that receives data from the host device, 2...
・Memory switching signal, 3, 4...address selector, 5
,6...Read/write memory, ? , 8, 9, 10.・
...Data bus buffer, 11...CPU that controls the mechanism section, 12...Data bus buffer switching signal, 13
... Host device, 14... Print head mechanism section, 15.
... Print head horizontal feed mechanism section, 16... Paper feed mechanism section.

Claims (1)

[Claims] (1) The first CPU receives print data from the host device and develops the printed characters into a dot pattern, and each mechanical section, such as horizontal feed of the print head, paper feed, and excitation of the print head, converts the printed characters into the developed dot pattern. Second CP to control based on
1. A high-speed printing device for a dot-type serial printer, characterized in that it has a U and two read/write memories that can be shared by the two CPUs to read and write data.