JPS5867484A - Printer - Google Patents

Abstract

PURPOSE:To obtain uniform-quality printings by varying the driving time of a printing hammer according to the moving distance of a carriage. CONSTITUTION:Key information put in a key board 101 is once stored in a key buffer 102 and then orderly read in CPU 103 where a carriage motor, a printing hammer, etc., are driven according to the key information. In short, when driving the carriage, the moving amount of the carriage makes reference to a predetermined moving amount conversion table 105 by a control program 104 according to the key information. At the same time, the data of UP/DOWN counter 107 displaying the present position of the carriage is added to the moving amount by CPU 103, the result is written down in a carriage position register 108, and at the same time the moving amount is stored in the register 118.

Description

[Detailed Description of the Invention] In recent years, in printing devices such as electronic tie writers, stationary impact printers are often used in which printing is performed after the type elements and bearings are completely stationary in order to improve printing quality. DC servo control, pulse motors, etc. are used to control these printing units, and the speed is controlled according to the distance traveled by the bearing. Then, a stop signal is issued in the vicinity of the first target position of the carrying ring, and in synchronization with this, a driving signal for the printing hammer is issued, and printing is performed immediately after the carrying comes to rest.

The stationary position at that time required extremely high precision, and the greatest goal was to move it to the target position at high speed.

However, those controlled by DC servo control and pulse motor control cause transient responses to stop signals,
Furthermore, it is difficult to obtain the same transient response for all distances traveled by the bearing.

However, waiting for this transient response to completely converge before printing leads to a decrease in printing speed, and improvements have been desired.

The present invention has aimed at the above-mentioned improvements, and has achieved stable printing quality even when the printing hammer is driven during normal intermittent printing and the movement of the tab printing tab and the like.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a perspective view of a printing device, in which 1 is a platen, 2 is a carrying ring, 3 is a printing hammer, 4 is a printing element, 5 is a bearing shaft parallel to the platen, 6 is a belt, and 7 is a printing element. The carrying motor allows the platen to be moved in the longitudinal direction. 8 is a ribbon cassette, and 9 is a ribbon.

FIG. 2 is a time chart showing the transient response when the carrying is stationary and the timing of the carrying signal and printing hammer. In the figure, the target position where the bearing stops is LO
It is shown by . In normal intermittent printing, it is moved from Ll. That is, the moving distance is 11, but when printing a tab, etc., it moves from L2 and the moving distance becomes 12. Also, each transient response is 1. It is represented by a2. Stop signal is at target position L
It is set to occur when reaching a certain distance from O. 1. As can be seen in a2, the transient response is different, so if the printing hammer is driven at the same time T1 from the carrying stop signal, printing will be performed in a2 before the vibration of the carrying ring has disappeared, and as a result, the printing position will change. Accuracy will deteriorate. Therefore, in the present invention, the printer is arranged in such a way that printing can be performed at the maximum printing speed during normal printing, while the printing speed is slowed down by setting the printing door rotation time to T2 only during tab printing to ensure printing position accuracy. .

FIG. 5 is a block diagram of an example of the present invention.

Key information input to the keyboard 101 is temporarily stored in the key back 7102 and is sequentially loaded into the CPU K@105. The CPU 103 drives the carriage motor, printing hammer, etc. in accordance with the key information as follows.

First, when driving the bearing, the control program 104 refers to table 1 105 in which the amount of movement of the bearing is determined in advance using key information.

At the same time, the current bearing position is displayed [JP 7m
The DATA of the counter 107 and the amount of movement are sent to the CPU 1.
05, the result (destination position f) is written into the carrying position register 108, and at the same time, the amount of movement is stored in the register 118.

On the other hand, by referring to Table 1 of 105 above, the CPU 10
6 issues commands for the carriage, printing hammer, wheel, ribbon winding, etc. via the peripheral circuit control device 109. The carrying movement command and drive current information are converted into analog quantities by the l)/A converter 110. The analog quantity is S'IN) Switching SW 111 when the P signal is released
The signal is amplified by the amplification device 112, and the carrying motor 11311 starts to be driven. When the motor 116 starts rotating, the interlocked rotary encoder 114 also rotates and is transmitted to the signal converter 115, which outputs a position pulse and a rotation direction signal.

The position pulse is sent to tJP[counter 107 and the carrying motor speed counter 116, and the rotation direction signal H is sent to the counter 107, respectively.

A CPU 116 sequentially calculates the speed of the motor 113 by counting the clock αX within the interval of the position pulses.
103 K transfer. The results are sequentially transferred to the 109 as the value of the current that drives the 115.

After the CPU continues to perform the above series of operations,
When the values of 108 match, that is, when the carrying reaches the target printing position range, the front position 11
Command the KSTOP signal. With this 5TOP signal, the 111 separates the 110 and 112, and the 11
4 is connected to 112, and the motor 113 is stopped by the output signal of 114.

This i CPU 103 reads the carriage movement information 118, refers to the delay time conversion list 106 to convert the value into the delay time until the hammer printing instruction corresponds to the value, and sets the value in the program timer 117. .

The contents of the list 106 are set in advance to optimal values, since the transient response characteristics are determined by the motor output, the weight of the bearing, the type of drive transmission system, etc. as shown in Figure @2.

When the program timer 117 times up, the CPU
drives the printing hammer 120 via the aforesaid 109 and the amplifier 119.

During the printing operation immediately after the TAB command, the amount of movement is TA of 121.
The difference between the B register and the 107 is stored in the 118,
Printing can be controlled using exactly the same procedure except that the contents of 121 are shifted to 10B.

With the above method, compared to conventional printing devices, it is possible to sufficiently compensate for the transient response characteristics determined by the carriage drive system, carriage motor, etc., and not only provide uniform printing quality (improved printing speed).

[Brief explanation of drawings]

FIG. 1 is a perspective view of the printing device used in the present invention. FIG. 2 is a time chart showing the transient response of the carriage and the timing with the hammer described in the present invention. FIG. 6 is a block diagram of an example of the present invention. It is a diagram. 1, platen, 2, carriage, 6, printing hammer,
101; Keyboard manual iron lid, 102; Key buffer,
106; Arithmetic processing unit, 104; Accumulation control program,
105 z Key→Move! Conversion table, 106; Hammer delay time table, 107; Uυm counter, 1
08; Carriage register, 109; Peripheral control device, 1
10; D/A converter, 111; switching circuit, 112;
Amplifier, 116; Carriage motor, 114; Rotary encoder, 115; Signal converter, 116; Carriage speed counter, 117; Program timer, 118
; Moving lid register, 119; Multiplier, 120; Printing hammer.

Claims (1)

[Claims] In a printing device that has a platen and a carrier that moves intermittently in the longitudinal direction of the platen and a printing means that is mounted on the carrier and prints when it is stationary, the drive timing of the printing simmer can be varied in accordance with the moving distance of the carrying. A printing device characterized by: