JPS62162568A - Serial printer - Google Patents

Abstract

PURPOSE:To enhance printing quality of figures while maintaining printing speed, by a method wherein at the time of printing a specified character, each component part is stopped at a predetermined position, and after a predetermined lapse of time, a hammer is driven to print the specified character. CONSTITUTION:With a printing-controlling action started, a velocity table 14 is referenced on the basis of set points, and accelerating, constant-velocity and decelerating controls are carried out. When it is detected that all of the controls are finished, a specified character detecting part 26 reference a specified character code table 26a, and sets a T2 timer 27 if a printing character code is for a specified character, and if not, a T1 timer 15. According to a time count output from the timer 15 or 27, a main controlling part 17 outputs a printing command to a hammer-driving part 18. When printing the specified character such as '1', the character is printed after mechanical vibrations of a printing head or the like are attenuated, and accordingly, positional errors will not be generated between lines in printing a figure or the like and printing speed in printing ordinary characters will not be lowered.

Description

[Detailed Description of the Invention] [Summary] The present invention provides a serial printer in which, when printing a specific character, a hammer is made to impact after a predetermined period of time after the mechanical vibrations of the print head etc. are attenuated after all movement controls are completed. I will provide a.

[Industrial application field]

The present invention relates to serial printers, and more particularly to improving print quality.

In a type wheel type serial printer, the carrier is moved, the type is selected, and the ribbon is fed for each character, and after each part is stopped, the type is printed by impacting the type with a hammer.

Mechanical vibrations occur in each of the parts whose movement is controlled as described above when they are stopped, so if the vibrations are not sufficiently attenuated and are impacted with a hammer, positional deviations will occur between the characters.

However, in normal character printing, in order to improve the printing speed, printing is performed before the vibrations are attenuated while maintaining a balance with print quality.

However, by such a serial printer, shapes,
Particularly, when "1" is printed in the same digit of each line to draw vertical ruled lines, there is a problem that the positional deviation between the lines becomes noticeable and the print quality deteriorates.

Therefore, there is a need for a serial printer that improves the printing quality without reducing printing speed.

[Conventional technology]

Fig. 3(a) is a perspective view of a type wheel type serial printer, Fig. 3(b) is a print control time chart, and Fig. 3(b) is a print control time chart.
Figure (C1 shows the block diagram.

In FIG. 3(a), 1 is a platen, 2 is an ink ribbon for multi-strike, 3 is a print wheel provided with a plurality of type characters 3a, 4 is a hammer that impacts the type characters 3a against the platen l, and 5 is a print wheel. 3 is a wheel motor that rotationally drives the required type to correspond to the hammer 4; 6 is the print wheel 3. Hammer 4. A carrier equipped with a printing unit consisting of a wheel motor 5 for spacing, 7 a carrier moving belt that joins the carrier 6 and moves the gear rear 6 by a space motor 9, 8 a space motor, and 9 a ribbon feed motor. It is.

In a serial printer with the above configuration, after printing one character, spacing and ribbon feeding are performed.

Type selection control is started by driving each motor, and after the stop control to a predetermined position is completed, the hammer 4 is driven.

FIG. 3(b) is a printing operation time chart for one character, where A is the ribbon feeding operation and B is the print wheel J.
, C represents the movement movement of the carrier 6, and D represents the drive pulse cycle to the space motor 8 corresponding to the speed C.

As shown in FIG. 3 (bl), at the end of each operation, mechanical vibrations centering on the stop position occur. For example, when the print wheel 5 is vibrating or the carrier 6 is vibrating. If you impact the type with the hammer 4 while printing, the print position will shift to the left or right from the normal position.

However, if the vibration is sufficiently damped and printed.

Since the printing speed decreases, the printing command is given after a time T1 that does not impair printing quality from the time point to when all stop controls are completed.

The details of the above printing operation will be explained with reference to the block diagram of the serial printer shown in FIG. 3(C) and the printing control flowchart shown in FIG. 3(d).

First, the mechanism for generating drive pulses will be explained.

The ribbon feed amount and print wheel rotation amount differ depending on the characters to be printed, and the ribbon feed amount table 13. The number of selected ribbon feed amounts is determined by the type selection table 12, and each motor is driven according to the speed table 14. (Hereafter, the amount of space is assumed to be constant.) In the speed table 14,! Pulse interval data with constant acceleration and deceleration speed profiles (hereinafter referred to as acceleration section and deceleration section) and constant speed pulse interval data set based on the amount of movement (constant speed section) are stored. By advancing the speed, a predetermined speed profile can be obtained.

The space drive unit 22 will be explained below as an example.

The main control section 17 first reads the leading value of the pulse interval data of the acceleration section of the speed table 14, sets it in the counter 23, and starts driving.

The counter 23 counts down with a clock of a predetermined time, and when the counter 23 reaches 0, a signal (hereinafter referred to as an interrupt signal) is sent.
is sent to the main control section 17 and the pulse generation section 24.

The main control unit 17 uses the above-mentioned interrupt signal to control the speed table 14.
Counter 2 reads the next pulse interval data.
Set to 3.

The pulse generator 24 generates a pulse [D in FIG. 3(b)] activated based on the above-mentioned interrupt signal and sends it to the drive pulse generator 25. For example, four-phase drive pulses are generated and supplied to the motor 8.

As described above, the motors in each section are controlled to be open based on the pulse interval data stored in the speed table 14, and stop when the damping section of the speed table 14 ends.

The printing control will be explained below with reference to FIG. 3(d).

(1) The main controller 17 controls the type selection table 12. Each drive amount is determined from the ribbon feed amount table 13, and pulse interval data is set in a counter provided in each drive section with reference to the speed table 14.

. . . Initial time (2) In response to the above-mentioned interrupt signal from each drive unit, the speed table of that drive unit is stepped and pulse interval data is set.

(3) If the predetermined speed table ends (deceleration ends), the corresponding flags 16a and L6b of the end flag section 16.

16c is set, and it is determined whether or not all have been completed by searching the respective end flags 16a, 16b, and 16c.

(4) If all is completed, set the T1 timer 15.

(5) After counting the T1 time, send a print command to the hammer drive section 18.

As mentioned above, since the driving time of each part differs based on the printed characters, the time to when all driving is completed is detected,
It is printed after Tl.

In FIG. 3 (C1), 19 is a hammer solenoid that drives the hammer 4, and the line feed system is not shown.

[Problem that the invention seeks to solve]

As explained above, conventional serial printers achieve both printing speed and printing quality, and print even though they are affected by mechanical vibration to some extent. As a result, a lateral shift occurs between printed characters, but this is not noticeable when printing characters.

However, when printing figures with the above settings, as shown in Figure 2 (a), for example, when connecting vertical ruled lines with the typeface "1", even a slight deviation is noticeable and the print quality deteriorates. There is a problem with that.

Therefore, in view of the above-mentioned problems, it is an object of the present invention to provide a serial printer that improves the printing quality in graphic printing, etc., without impairing the printing speed.

Means for Solving Problem C] In order to achieve the above object, the serial printer of the present invention includes means (28) for detecting specific characters based on printed information, as shown in the principle explanatory diagram in FIG. It is equipped with a timer (29) that counts a predetermined period of time after the stop control of each part is completed when a specific character is detected. It prints by applying impact.

[Effect]

Figure 2 (a1) As shown in the operation time chart of the present invention, when a specific character such as "1" is detected, time 10
Printing is performed 12 hours after the mechanical vibrations have sufficiently attenuated.

Therefore, when printing figures using vertical ruled lines or the like, there is no misalignment, and there is no reduction in printing speed during normal printing.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

FIG. 2(b) is a block diagram of the serial printer of the embodiment, and FIG. 2(C) is an operation flowchart.

In Figure 2 (bl), 26a is a specific character code table, which selects characters with noticeable deviations in graphic printing, etc., and stores the codes; 26 is a specific character detection unit, which contains the specific character code table. 26a, if the printed character is a specific character, it sets the T2 timer at the movement control end time to, and if it is not a specific character, sets the T1 timer; 27 is the T2 timer, After counting 12 hours by setting the character detection unit 26, an interrupt signal is sent to the main control unit 1.
7, and the same reference numerals as in FIG. 3(C) represent the same objects.

In the serial printer having the above configuration, the print control operation will be explained with reference to FIG. 2(C).

(1) When the print control operation is started, the print wheel control, ribbon feed control, and space control are accelerated by referring to the speed table 14 based on their respective set values by the operation shown in FIG. 3(d). , constant speed, and deceleration control are performed, and at the end of each speed table, a type selection end flag 16a, a ribbon feeding end flag 16b, and a space end flag 16c are set, respectively.

(2) When the end flag is searched and all the above control ends are detected, the specific character detection unit 26 refers to the specific character code table 26a and determines whether or not the printed character code is a specific character, When using a specific character, use the T2 timer.
If the character is not a specific character, a T1 timer is set.

(According to the time count output of the 31Tl timer 15 or the T2 timer 27, the main control section 17 sends a printing command to the hammer drive section 18, causing the hammer 4 to impact the type 3a.

According to the above, when printing a specific character such as "1",
Since printing is performed when the mechanical vibrations of the print head etc. are attenuated, there is no misalignment between lines when displaying graphics, etc., and there is no reduction in printing speed during normal character printing.

〔Effect of the invention〕

As explained above, the present invention provides a serial printer that prints specific characters for displaying figures after the mechanical vibrations of the head etc. are sufficiently attenuated.
This has the effect of improving the print quality of graphic display without impairing the printing speed of character printing.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the principle of the present invention, Fig. 2 (a) is an operation time chart of the invention, Fig. 2 (b) is a block diagram of a serial printer according to an embodiment, and Fig. 2 (C) is an operation diagram. Flow chart diagram, Figure 3 (a) is a perspective view of a tight wheel type serial printer, Figure 3 (bl is an operation time chart diagram, Figure 3 (C) is a block diagram of a conventional serial printer, Figure 3 (d) ) is a conventional printing control flowchart.In the figure, 1 is a platen, 2 is an ink ribbon, 3 is a print wheel, 4 is a hammer, 5 is a wheel motor,
6 is a carrier, 8 is a space motor, 9 is a ribbon feed motor, 12 is a type selection table, 13 is a ribbon feed table, 14 is a speed table, 15 is a T1 timer, 16 is an end flag section, 16a is a type selection flag, 16b is a ribbon feed end flag, 16c is a space end flag, 17 is a main control unit, 18 is a hammer drive unit, 20
21 is a print wheel drive unit, 21 is a ribbon feed drive unit, 22 is a space drive unit, 23 is a counter, 24 is a pulse generation unit, 25 is a drive pulse generation unit, 26 is a specific character detection unit, 26a is a specific character code table, 27 is a T2 timer, 28 is a specific character detection means, and 29 is a timer. Tsubane Iku゛] /) Syria j 7' link, pro nokdo] Yu C2 shiq (b Tsutaia'hon J-L type Uriryorua'lJ >L extra 11 crimes-
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Claims (1)

[Scope of Claims] A serial printer that controls the movement of an ink ribbon, a print wheel, and a carrier for each character based on printing information, and prints selected characters by impacting them with a hammer, the serial printer comprising: and a timer (29) for counting a predetermined period of time after all the stop controls of the respective parts are completed when the specific character is detected, and when printing the specific character, A serial printer characterized in that after each part is stopped at a predetermined position, printing is performed by impacting a hammer after a predetermined time.