JPS61255157A - Raster type recording device - Google Patents

Abstract

PURPOSE:To constitute inexpensively a constitution by providing a memory, its write circuit and a read circuit to a data input section to constitute and FIFO memory and using a sub-scanning control section to supervise the data quantity of a memory thereby relaxing speed unbalance between the input and output and adopting the method storing all input data. CONSTITUTION:A data is inputted to the FIFO memory 1 via communication line 11. A print control section 2 reads a data 12 for one line's content from the FIFO 1 synchronously with a print command 13, gives the data 4 to a print head 4 to drive a print signal 15 for print. A subscanning control section 3 takes a difference between the memory address output 16 of a write circuit 1b operated in writing the data sent from the communication line 11 in a memory 1a and the memory address output 17 of a read circuit 1c operated in reading the data from the memory 1a by the print control section 2 to recognize the data quantity stored in the memory 1a. The operating speed of a drive system 5 is decided from the data quantity obtained in this way to send a drive signal 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling the speed in the sub-scanning direction of a marking device which is used in the concept of printing, printing, etc. and whose input data is raster type.

[Summary of the invention]

The present invention provides a raster type recording sickle device in which the input section is provided with a memory having a capacity that matches the characteristics of the drive system that performs sub-scanning.
By monitoring the amount of data stored in the memory, the speed in the sub-scanning direction can be determined appropriately.

[Conventional technology]

Conventionally, this type of device did not take sub-scanning characteristics into consideration, and from the viewpoint of simple I/C economy, it had only a small capacity memory of 1 or 2 lines, or it prioritized output speed. The only format available was one that could store all the input data. In the former case, if we consider the case where a stepping motor is used, it is impossible to predict that the data will be interrupted, so the motor can only be operated at a speed below the self-starting frequency, or below a speed at which it can immediately decelerate or stop. In the latter case, although the output speed is satisfactory, the cost is high.

[Problems to be Solved by the Invention] In general, this type of recording apparatus is most efficient when the data input and sub-scanning speeds are synchronized.

This is because there is no need for memory to temporarily store data. However, in reality, the data input speed and sub-scanning speed are not balanced. With recent technological innovations, recording devices
The O output speed is rapidly increasing. Data entry, on the other hand, tends to be delayed.

It is true that high-speed communication networks are being proposed and implemented, but these networks are designed to connect a large number of devices, and cannot necessarily receive data at a constant speed. In a recording device that only has memory for one or two lines, it is assumed that data may be input at an excessive speed at a certain moment, and the memory may be empty at a certain moment, so it is necessary to take advantage of the recording device's original ability. It does not reach.

The present invention provides a method of alleviating the speed imbalance between input and output, cheaper than a method of storing all input data, and, depending on the circumstances of the communication system, obtaining an output speed equivalent to that method. It is.

[Means for solving problems]

The data input section is provided with a memory, its writing circuit, and its reading circuit to form an F-type FO memory, so that the amount of data in the memory can be monitored by the sub-scanning control section. It is sufficient that the memory has a capacity equal to or more than several sub-scanning lines corresponding to the rotation angle or movement distance necessary for acceleration/deceleration of the sub-scanning pivoting section.

[Effect]

In data communication systems, data is generally sent in units of a certain amount of data. In the above configuration, when data is received in this manner, data gradually accumulates in the r-processing FO. In response to this, the sub-scan control section gradually increases the sub-scan speed and at the same time sends a print command to the print control section every time the -line □ is fed.

If more than a certain amount of data is stored, sub-scanning is performed at the maximum speed, and a temporary decrease in data transfer speed in the communication system does not give a model number. When the data in the memory becomes less than a certain amount, the speed is reduced, and when the memory becomes empty, the speed is stopped. When the memory is full, data input from the communication system is prohibited.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In Fig. 1, data is transmitted to F engineering FO via communication line 11.
The memory 11Ic is input. The data may be raster data directly indicating whether each dot is on or off, or encoded compressed raster data. However, in the case of compressed raster data, the mechanism for counting how much of the data stored in the y-process FO corresponds to is a little complicated, and it is necessary to decode it in the next stage. Needless to say. F1?01 consists of a memory 1a, a write circuit 1b, and a read circuit 1C. The print control unit 2 reads one line of data 12 from the IT's FO 1 in synchronization with the print command 13, passes the data 14 to a print head (for example, a thermal head), and drives a print signal 15 to print. The sub-scanning control section 3 outputs the memory address output 16 of the writing circuit 1b which is activated when writing the nine data sent from the communication line 11 to the memory 1a, and the print control section 2 outputs the memo IJ1.
The amount of data stored in the memory 1a can be determined by taking the difference between the memory address outputs 17 of the readout circuit 1C that operates when reading data from the memory 1a. From the amount of data thus obtained, the operating speed of the drive system 5 is determined as shown in Table 1, and the drive signal 18 is sent.

For example, if the drive system 5 is composed of a stepping motor, a mechanical transmission system, and thermal paper, the drive signal 18 is a pulse train with a frequency proportional to the feeding speed. One pulse or multiple pulses indicates the amount of movement for one line. A print command 15 is output every time this moving amount for one line is sent. Since the stepping motor can perform intermittent speed control if the speed is below the self-starting frequency, the data amount vs. speed diagram shown in FIG. 2 can be obtained.

vmax is the maximum feed speed at which the drive system 5 can operate, vO
is the feed rate at the self-starting frequency, and 1 e XO is the corresponding data amount converted into the number of lines.

In other words, it is as follows.

(i)! When -0, stop (ii) o (V can be stopped at any time in the range of x≦x0. Fixed at O speed (If) In the range of Xo < X < .The acceleration/deceleration pattern is arbitrary.

(When jJ x, ≦xtv@, the maximum continuous interval is fixed to Vmax.

If a table containing such conversions is provided to the sub-scanning control section 3, the drive signal 18 can be easily output. Further, as is clear from Table 1, the busy memory 1a only needs to have a minimum capacity of X, and beyond that it is sufficient to take into account the amount of variation in data and evening transfer speeds in the communication line 11.

〔Effect of the invention〕

As explained above, by configuring the raster type output device according to the present invention, it is much cheaper to realize 1d [iK] than the configuration in which all input raster data is stored in a memo IJK (depending on the characteristics of the sub-scanning control section, (In some cases, it is possible to use memory for a line.) If the data communication system is a system that takes an output device into consideration, it is possible to obtain an output speed equivalent to that.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a raster type output device. FIG. 2 is an explanatory diagram showing the correspondence between data amount and speed. 1...7 FO memory 1a...Memory 1b...Writing circuit 1C...readout circuit 2...Print control section 3... Sub-scanning control section 4...Print head 5・・・Attitude system that's all Applicant: Seiko Electronics Industries Co., Ltd. To the shipping address Figure 2

Claims (1)

[Scope of Claims] In a raster type recording device having a line head in the main scanning direction, a. a memory for temporarily storing received raster data; and b. print control for reading one line of data from the memory and printing it on the print head. A motor drive section provided for sub-scanning, d, a sub-scanning control section for controlling the drive system, and e, the scanning speed of sub-scanning is controlled by the amount of data stored in the memory. A raster amount recording device characterized by