JPS5869072A - Method of correcting timing at two-way printing time - Google Patents

Abstract

PURPOSE:To decrease a shear in printing at a two-way printing time of a graphic printer, by a method wherein a print solenoid driving signal is transmitted to a print solenoid in delay by a desired delay time than a timing signal. CONSTITUTION:If it is verified that a print solenoid control P2 is brought to a more rightward printing condition than a printing directing detection P6, a print solenoid driving pulse PS1 is applied to a print solenoid P1 at a rise time of a timing signal TS. If it is verified that the print solenoid control P2 is brought to a leftward printing condition, a timer P4 actuates in response to a timing signal TS by a delay time DR previously set by a dip switch P5 and corresponding to a parameter, and after the delay time DR has elapsed, a driving signal PS2 is applied to a print solenoid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of timing correction during bidirectional printing of a graphic 1 printer.

Bidirectional printing has the advantage of faster printing speed than unidirectional printing. However, in conventional graphic printers capable of bidirectional printing, as shown in FIG. 2, right direction printing RDI and left direction printing? ,,In D1,
Print deviation DF occurs.

The causes of this increase in printing deviation include mechanical backlash and electrical banklash. On the other hand, the reason for reducing this printing deviation t is the current application time ([61Et
In the case of a printer in which there is a delay from the time of printing to the time of impact), the effect of increasing the printing ri due to mechanical bank lash and electrical bank lash is greater than the movement of reducing the printing deviation tube due to the running wL time.

An object of the present invention is to reduce print deviation during bidirectional printing by a graphic printer.

As is clear from FIG. 2, the left side printing QK impacts the paper at a too early timing. Below, a method for correcting this timing will be explained with reference to FIGS. 1, 4, and 5wJK.

When the print position maid control P2 recognizes that the print direction is in the right direction printing state from the print direction detection P6, the tying signal TI! At the rising edge of the print solenoid drive pulse P811i, the print solenoid drive pulse P811i is applied to the print solenoid P1.

On the other hand, when it is confirmed that the print solenoid control P2 is in the left direction printing state, in response to the timing signal 78,
The timer P4 operates for the delay time DR in accordance with the parameters given in advance by the dip switch P5, and only the drive pulse P82 is applied to the print solenoid during the delay time DR. Due to the delay time DR, the printing deviation of pudding)ljiiJ becomes smaller. Also,
Since a DIP switch is used as a parameter to determine the delay time, appropriate parameters can be set for each individual pudding.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of print solenoid control that applies pulses to the print solenoid. Figure 2 is an example of printing obtained by a graph ink printer without timing correction. Figure 5 is a timing correction example. This is an example of printing by a large graphic printer. Figure 4 is a timing chart when printing in the right direction. Figure 5 is a timing chart when printing QK on the left side.・・・Print solenoid IFIJIIP5...
Tying signal P4-・Timer- P5...Dimp switch P6...Printing direction detection 1'tD1. 'LD1--Printing example of a graphic printer without correcting tie-2Dν...Print I deviation RDI, 1D2--Tie-2 correction! Printing example when adding TB...Timing signal P81--Print solenoid drive pulse when printing in the right direction PO2...Print solenoid drive pulse when printing in the left direction DR...Timing of the print solenoid drive pulse More than the delay time for the signal Applicant Shinshu Seiki Co., Ltd.

Claims (1)

[Claims] A timing correction method characterized by transmitting a print solenoid drive signal to the print solenoid with a delay of one desired delay time from the timing signal during bidirectional printing of the graph ink printer.