JPS59178278A - Speed-controlling system for type-type serial printer - Google Patents

Abstract

PURPOSE:To enable to enhance printing efficiency, by a method wherein a basic spacing feed speed is obtained from a table means on the basis of a calculated type-selecting distance, then the speed is modified on the basis of a spacing distance, and an optimum spacing feed speed is set. CONSTITUTION:A calculating part 2 for the moving distance of a carriage calculates a required moving distance Si of the carriage from the position ci at which a character is to be printed and the current position cl of the carriage, and calculates a rotating distance rj for reaching a target type position from the character aj to be printed next and the current position ak of a daisy wheel. A calculating part 4 for the spacing feed speed calculates a spacing feed speed Vij from both of the distances Si and rj. On the other hand, a reference table 5 reserves a spacing feed speed V0j at a flying printing starting distance S0 for the distance rj, and a spacing speed Vij for an arbitrary carriage moving distance Si is obtained through a functional calculation from V0j. Accordingly, the optimum spacing speed can be always set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a speed control system for a typeface serial printer, and more particularly to a speed control system for a soubène feeder that performs flying printing.

[Technology background]

For example, in a daisy (petal) wheel type serial printer using a flying printing method, while the space is being fed to the next printing position, that is, the carriage is moving, the next type to be printed on the daisy wheel is moved to the impact position. Selection control is performed to rotate the carriage, and flying printing is performed without stopping the carriage.

At this time, as shown in FIG. 1, character selection on the daisy-wheel 1 is fastest under the best conditions when the next character to be printed is at the impact position A at the current position of the daisy-wheel 1. , and 1801 displacement position B, which is the farthest from the impact position A, is the worst condition and the slowest.

By the way, in the flying printing method, when space feeding the carriage to the next printing position, type selection must be completed before the carriage reaches that printing position. had to be set to a value that is not too fast so as to allow enough time for the character selection at 1so'Tp transposition B, which is the worst condition, to be completed.

In conventional flying printing type serial printers, the space feed speed is set in accordance with the selection conditions for the type to be printed next.

FIG. 2 is a characteristic diagram showing the relationship between space movement distance and printing time based on differences in type selection conditions in the conventional method. The space feed speed is under the best conditions (characteristic α)
It is set faster as it is closer to , and slower as it is closer to the worst condition (characteristic b), and is maintained as it is. Furthermore, if the space movement distance is small, flying printing is not possible.
Static printing is performed. In other words, the space feed speed is
This is set as the maximum allowable value for each character selection time with respect to the minimum distance SO that allows flying printing.

However, in the conventional method described above, when the distance to the next printing position is long, even if type selection has already been completed, the initially set space feed speed is maintained, resulting in poor print processing efficiency. 1. > and I/) had some drawbacks.

[Object and structure of the invention]

An object of the present invention is to improve the print processing efficiency of the printer by setting the optimum value according to the space feed distance even when the space feed speed is changed depending on the type selection conditions in a type serial printer using a flying printing method. It's about doing.

In order to achieve the above object, in the movable type serial printer of the present invention, which is capable of printing with stripes and flying, information on the next print position and characters to be printed, and information on the current carriage position and character selection position are input, and the next print position and character information are input. Space forwarding 9
means for calculating the distance and the type selection distance; and table means for storing the basic space feed speed corresponding to the type selection distance; The present invention is characterized in that the basic space feeding uncertainty is determined, and the basic space feeding speed is further changed based on the space feeding distance to determine the optimum space feeding speed.

[Embodiments of the invention]

The details of the present invention will be explained below based on examples.

FIG. 3 is a characteristic diagram of the space feed speed control realized by the present invention, and corresponds to the characteristic diagram of the conventional method shown in FIG.

According to the method of the present invention, the space feed speed for printing under the same type selection conditions is based on the maximum space feed speed that satisfies the type selection time for the minimum flying printable distance So, and the carriage movement distance. The space feeding speed is set to be different depending on the length of the carriage, and the space feeding speed is always set faster as the carriage travels longer. The space feed speed (a), which is the best condition for type selection, is made as close as possible to the space feed speed (a), so that even if the carriage movement distance becomes long, the required time does not increase beyond the type selection time.

FIG. 4 shows an embodiment of the circuit according to the present invention. In the figure, 2 is a carriage movement distance calculation section, 3 is a type distance calculation section, 4 is a space feed 9 speed calculation section, 5 is a reference table, and 6 is a carriage feed 9 control circuit.

The carriage movement distance calculation unit 2 calculates the position C to be printed next.
A required moving distance Si of the carriage is calculated from i and the current position Ct of the carriage. From the next printed character and the current position α of the daisy wheel, the printing distance calculation unit 3 calculates
Rotational distance r to the target type position on the daisy wheel
Calculate.

The space feed speed calculation unit 4 calculates the carriage movement distance Si.
The space feed speed Vi) is calculated from the character distance r). The reference table 5 shows the space feed speed Vo) at the flying printing start distance So with respect to the type distance r).
For the space movement speed Vi) for any carriage movement distance Si, based on ■θ, 1
(Functional calculation is performed to find this. This is the result of all Si and r
), creating a table of Vri would require a huge amount of memory capacity for the table.

An example of a calculation formula for obtaining the above Vi) is shown below.

Ti)' ” f(Si , r)') ””S
i/Vi)' = Si/Vo)' (1+αN) where Ti)- is the function f (Si, r)) of the carriage movement distance Si and the type distance r, and ■O (1+αN)
gives the optimal space feed rate v. Vo) is the standard space feed speed obtained by indexing the standard table with τ, α is a predetermined coefficient, N is a function of the distance from the flying printing start position So, and the minimum unit of distance is △ When ru is a selected integer, it is a number that increases by 11' for every Δ.

This means that the space feed υ speed Vij
means to change.

For example, in the case of bi-type type, the character width is 12//1
It is defined as 20 inches. Therefore, the distance unit △='/
If it is 120 inches and Luni 3, the IN is n6:
It will change by 1 every 3/120 inch. Furthermore, if α=174, then Tij=S
1Alo )' (1+N/4) However, N is % ((
Sequence that increases every Si SO) / 3Δ) 0,
1, 2, 3, 4. ......, and each time N changes by 4, the reference speed Vo) is doubled, tripled, etc.
You can get the effect of Therefore, if the standard required time at So is To), then To) for the increase in SL
If α and l are selected so as not to increase by '-19, the optimum space feed speed v can be found.

Vi) can be increased until the spacing and speed in the best conditions of type selection are reached.

In this way, the distance Si to the next printing position, the type selection distance γ, and the always optimal space feed speed Vi
) can be set.

〔Effect of the invention〕

As described above, according to the present invention, even when the carriage movement distance to the next printing position is long, the carriage can be moved at a high speed of space advance and flying printing can be performed. The processing efficiency of the printer can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the type selection conditions of the daisy wheel, Fig. 2 is a space feed control characteristic diagram of a conventional serial printer, Fig. 3 is a space feed control characteristic diagram of a serial printer according to the present invention, and Fig. 4 1 is a configuration diagram of an embodiment of the present invention. In the figure, 1 is a daisy wheel, 2 is a carriage movement distance calculation section, 3 is a character distance calculation section, 4 is a space feed speed calculation section, 5 is a reference table, and 6 is a carriage feed control circuit. Patent attorney 401, agent of patent applicant Fujitsu Limited?

Claims (1)

[Claims] In a type serial printer capable of flying printing, information on the next print position and characters to be printed, information on the current carriage position and type selection position are input, and the next space feed distance and type selection distance are calculated. and table means for storing a basic space feeding speed corresponding to the type selection distance, and calculating the basic space feeding speed from the table means based on the calculated type selection distance; A speed control method for a type serial printer, characterized in that a space feed speed is set by changing the force speed based on the space feed distance.