JPS6234551B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charge control type inkjet recording device, and in particular, when the power is turned on, the excitation of the inkjet head is delayed by a predetermined period of time from the start of ink jetting, or when the power is turned off, the excitation of the inkjet head is The excitation is stopped and ink ejection is stopped after a predetermined period of time has elapsed, thereby preventing ink stains on surrounding members during initial ink ejection.

FIG. 1 is a schematic configuration diagram for explaining an example of an inkjet recording device to which the present invention is applied.
In the figure, 1 is an ink jet head, 2 is an ink supply pipe, 3 is a vibrator, 4 is a nozzle hole, 5 is a charging electrode, 6a and 6b are deflection electrodes, 7 is a gutter, and 8 is a recording paper. The ink in the ink jet head 1 is pressurized and excited to be ejected from the nozzle hole 4, and the ink liquid column 9 ejected from the nozzle hole 4 is separated into ink droplets at the charging electrode 5. The ink droplet is given a charge according to the printing information signal, and the charged ink droplet 10 is deflected by the deflection electrodes 6a, 6b according to the amount of charge to reproduce information on the recording paper 8, while not being used for printing. The uncharged ink droplets 11 are captured and recovered by the gutter 7 and are used again.

Conventionally, in the above-mentioned inkjet recording device, when the power is turned on or off, the excitation of the vibrator and the jetting of ink are started or stopped at the same time. The sprayed particles were scattered in all directions, staining surrounding members such as the charging electrode, deflection electrode, gutter, and recording paper.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and includes starting the excitation of the vibrator after a predetermined period of time has elapsed after starting ink jetting when the power is turned on, or When the power is cut off, the ink jetting is stopped after a predetermined period of time has elapsed after the excitation of the vibrator is stopped, thereby reducing the scattering of ink particles.

Fig. 2 is a time chart for explaining the operating principle of the present invention, Fig. 3 is an electric circuit diagram for explaining one embodiment of the present invention, and 20 detects that the power is turned on. This is a power-on detection circuit.
Now, when the inkjet recording device is powered on by a power switch (not shown), the power-on is detected by an integrating circuit consisting of a resistor _R1 and a capacitor _C1 , and the output terminal of the power-on detection circuit 20 is turned on. The signal becomes high level (see Figure 2 A), and 2
The monomultis 21 and 22 are operated. After the time (t ₁ ) determined by the resistor R ₃ and the capacitor C ₃ has elapsed, the signal at the output terminal of the monomulti 21 becomes high level (see FIG. 2B), and the ink starts to be ejected. Furthermore, _{the signal} at the _output terminal of the monomulti ₂₂ becomes high level ( _second
(see Figure C), start excitation of the vibrator.

As is clear from the above description, according to the present invention, when the power is turned on, ink jetting is first started,
After that, the vibrator is excited after a predetermined period of time has elapsed, and ink jetting and vibrator excitation are not performed at the same time, which reduces ink scattering when the power is turned on, and thus reduces the Ink stains on members can be reduced.

In addition to the embodiments described above, a microcomputer may be used to delay the excitation of the vibrator from the start of ink jetting. This can be easily carried out using a counting means. In addition, although the case when the power is turned on has been explained above, when the power is turned off, the procedure is the reverse of the above, that is, the excitation of the vibrator is stopped, and after a predetermined period of time has elapsed, the ink jetting is stopped. For example, it is possible to prevent ink stains when the power is turned off.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram for explaining an example of an ink jet recording apparatus to which the present invention is applied, FIG. 2 is a time chart for explaining the operating principle of the present invention, and FIG. 3 is a diagram of the present invention. FIG. 2 is an electrical circuit diagram for explaining one embodiment of the present invention. 1... Inkjet head, 3... Vibrator,
5...Charging electrode, 6a, 6b...Deflection electrode, 7...
... Gutter, 8 ... Recording paper, 20 ... Power-on detection circuit, 21, 22 ... Monomulti.

Claims (1)

[Scope of Claims] 1. A charge control type inkjet recording device, which includes a timing setting device that determines the timing to start excitation of the vibrator after a predetermined time elapses after ink ejection starts when the power is turned on, and the timing setting device An inkjet recording device characterized in that ink jetting and vibration of a vibrator are performed according to an ink jetting signal and an excitation signal generated from a setting device, respectively. 2. A charge control type inkjet recording device is provided with a timing setting device that determines the timing so that when the power is cut off, the excitation of the vibrator is stopped and ink ejection is stopped after a predetermined period of time has elapsed, and the timing setting device An inkjet recording device characterized in that ink jetting and vibration of a vibrator are performed according to an ink jetting signal and an excitation signal, respectively.