JPS6227673B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-speed inkjet recording device,
In particular, it relates to improvements in the printhead travel mechanism.

FIG. 1 is an explanatory diagram of a conventional inkjet recording device, in which the print head is shown in cross section. The carrier 4 moves while being guided by guide bars 2 and 3 arranged parallel to the recording surface of the recording medium 1 such as recording paper. A nozzle portion 5 integrated with a charging electrode 7, a pair of deflection electrodes 8 and 9 facing each other, and a gutter 12 are mounted on the carrier 4, and constitute a print head 20. A high-voltage power supply 11 is located separately from the printhead 20 and is connected to the lower deflection electrode 9 by a high-voltage wire 10, with other conductors connected to the flat cable 1.
3 branches into a charging electrode 7 and deflection electrodes 8 and 9.
It is connected to the. Further, an ink tube 14 is connected to the nozzle portion 5 to eject pressurized ink. On the left side of the print head 20, the recording medium 1 guided by the roller 21 is placed in the print head 2.
It moves intermittently in a direction perpendicular to the direction of movement of 0.

The operation of the inkjet recording apparatus constructed in this manner will be briefly described below. When the pressurized ink is ejected from the nozzle section 5, the ink particles 6 are positively charged by the information signal while passing between the charging electrodes 7, and are deflected when passing between the deflection electrodes 8 and 9.
The amount of deflection varies depending on the amount of charge of the ink particles 6 related to the voltage applied to the charging electrode 7 in accordance with the information signal, and the ink particles 6 that are not blocked by the gutter 12 adhere to the recording medium 1 . The charged electrode 7
By controlling the voltage applied to the recording medium 1 using information from a computer, for example, characters can be drawn on the recording medium 1. Incidentally, after the print head 20 is moved laterally to print one line of characters, it returns to its original position, and then the recording medium 1 is advanced by one line to repeatedly print the next line.

However, this inkjet recording device had the following drawbacks.

(1) Since it is not possible to reduce the gap between the carrier 4 and the guide bars 2 and 3 to zero, the print head 2
When 0 reaches the turning point, flat cable 1
The ink tube 3 and the ink tube 14 vibrate vertically due to their inertia, and the vibrations continue during recording, making it impossible to record accurately. Also, guide bars 2 and 3
The sliding portion between the carrier 4 and the carrier 4 gradually wears out, and vibration increases.

(2) As the print head 20 moves back and forth, the high-voltage electric wire 10 is also shaken, and its bent portion is likely to break. A high voltage of 6KV, for example, is applied to this high-voltage wire, so if it were to break, it could cause electrical leakage or discharge, which could be dangerous. or memory may be destroyed.
It has been extremely difficult to take safety measures and measures to prevent the influence on conductors that transmit other electrical signals.

An object of the present invention is to provide an inkjet recording device suitable for performing stable recording.
The feature is that a high-voltage power source that supplies high voltage to the deflection electrodes is fixed to the lower part of the carrier to form a moving body, and a guide member is placed in the space formed between the carrier of this moving body and the high-voltage power source. and a means for moving the movable body close to the center of gravity of the movable body.

FIG. 2 is a sectional view of an inkjet recording apparatus according to an embodiment of the present invention, and FIG. 3 is a right side view of FIG. 2.

The same parts as in FIG. Right-angled edges are formed on both sides. The grooves of a pair of rollers 24 having V-shaped grooves are fitted into this right-angled edge. A pair of rollers 24 are rotatably secured to the carrier 4 by bolts and nuts, and a gutter 1 is mounted on the carrier 4.
2. A nozzle section 5 to which deflection electrodes 8 and 9 and a charging electrode 7 are attached is mounted. This carrier 4
A holder 22 is fixed to the lower part of the guide member 23 with a set screw 27 so as to cover the lower surface of the guide member 23, and a high voltage power source 11 is attached below the holder 22. Further, a groove plate 32 having a downward groove is attached to the lower end surface of the protrusion provided on the right side of the carrier 4, and a protrusion 33 of the endless belt-shaped traction member 26 is fitted into this groove. There is. Note that the groove plate 32 that fits into the pulling member 26 is attached at a location extremely close to the center of gravity 25 of the moving section including the print head 20 and the high voltage power source 11.

A largely curved ink tube 14 is connected to a nozzle section 5 placed on the carrier 4, and ink particles 6 are ejected from the nozzle section 5. The ink particles 6 are positively charged by a charging electrode 7 in accordance with the information signal, and are deflected by passing between an upper deflection electrode 8 and a lower deflection electrode 9 that form a deflection electric field, and are deflected onto the recording medium. Attach to. Note that the ink particles 6 that are not charged and travel straight collide with the gutter 12 and enter the ink reservoir 15. A conducting wire 29 for transmitting information signals is connected to the charging electrode 7, and a conducting wire 28 and a high voltage cable 34 are connected to the deflection electrodes 8 and 9. Further, a conducting wire 30 that is a pair with the above-mentioned conducting wire 29 is connected to the nozzle portion 5, and these conducting wires 28, 29, 30 and an input conducting wire 31 to the high voltage power source 11 are branched from the flat cable 13 which is left largely slack. It is something.

Therefore, as the print head 20 moves, the flat cable 13 easily bends, causing the conductors 28 to
Do not apply excessive force to 31.

In the inkjet recording device configured in this way, when the pulling member 26 is driven, the print head 20 and the high voltage power source 11 move as a pair, but the pair of rollers 24 roll on the fixed guide member 23. Because of this, there is less friction, and although the moving body is heavier than before, it moves extremely smoothly. Furthermore, the center of gravity 25 of the entire moving body is located at the traction member 26.
Since it is located close to the point, the rotational moment that moves the moving part up and down at the turning point is small.
Since the guide member 23 and the pair of rollers 24 are always in close contact with each other, vertical movement is also suppressed.

The high-voltage cable 34 that applies a high voltage of 6 KV from the high-voltage power supply 11 to the deflection electrode 9 moves together with the carrier 4 and the high-voltage power supply 11, so it does not bend as the print head 20 moves, as in the conventional case. . In addition, the input conductor 3 to the high voltage power supply 11
1 only supplies a low voltage such as 24V, so it is sufficient to branch it out from the ordinary flat cable 13.

As described above, the inkjet recording device of this embodiment has a print head and a high-voltage power supply integrated into one body, which are moved along a guide member via a pair of rollers, and which are placed extremely close to the center of gravity of the entire moving section. Since the movable part is pulled by the installed grooved belt (traction member), vertical movement of the movable part at the turning point is significantly reduced, resulting in stable and high-performance recording. In addition, the electrical wiring to the ink tube and each part is connected by using lightweight and easily bendable flat cables that are curved in a large way.
Since the high-voltage cable connecting the high-voltage power source and the deflection electrode is fixed to the moving part, there is also the effect that no unreasonable force is applied to these conducting wires, and no disconnection or discharge occurs.

In the above embodiment, a pair of rollers 24 are brought into contact with a plate-shaped guide member 23 to move the print head 20, etc., but the guide member 23 is made into two parallel rods, and the carrier 4 slides on the guide member 23. Similar effects can be obtained by arranging the rollers to move via a pair of rollers or a pair of rollers.

The inkjet recording device of the present invention has the advantage of operating smoothly and providing accurate recording over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional inkjet recording apparatus, FIG. 2 is a sectional view of an inkjet recording apparatus according to an embodiment of the present invention, and FIG. 3 is a right side view of the apparatus of FIG. 2. DESCRIPTION OF SYMBOLS 1... Recording object, 4... Carrier, 5... Nozzle part, 6... Ink particle, 7... Charging electrode, 8...
...Upper deflection electrode, 9...Lower deflection electrode, 11...
High voltage power supply, 12... Gutter, 13... Flat cable, 14... Ink tube, 20... Print head, 22... Holder, 23... Guide member, 24... Roller, 25... Center of gravity, 26... ... Traction member, 27 ... Set screw, 29-31 ... Conductor,
32...Groove plate, 33...Protrusion, 34...High voltage cable.

Claims (1)

[Scope of Claims] 1. A carrier that reciprocates while being guided by a guide member installed parallel to the recording medium, and a nozzle section, a charging electrode, and a deflection electrode mounted on the carrier; After the ink particles ejected from the part are charged by the charging electrode to which a voltage according to the information signal is applied, the ink particles are deflected by passing through an electric field created by the deflection electrode, In the inkjet recording device for recording information on the recording medium, a moving body is constructed by fixing a high voltage power source for supplying high voltage to the deflection electrode to the lower part of the carrier, and the carrier of the moving body and the high voltage An inkjet recording device characterized in that the guide member is installed in a space formed between the guide member and a power source, and a means for moving the movable body is provided close to the center of gravity of the movable body. 2. The moving means of the moving body is provided with a groove plate attached to the lower surface of the carrier, and a band-shaped traction member having a large number of protrusions that fit into the grooves of the groove plate,
The inkjet recording apparatus according to claim 1, which is a mechanism for reciprocating the pulling member. 3. The inkjet recording device according to claim 1, wherein the guide member is a plate-like member having ridges formed on both sides thereof to fit into V-shaped grooves of a pair of rollers attached to the carrier.