JPS63182676A - Electrifier for copying machine - Google Patents

Abstract

PURPOSE:To effectively remove a contaminant by bringing a fan to a reverse rotation at the time of operating a wire cleaner, and discharging the contaminant which has adhered to a charge wire, to the outside of an electrifier. CONSTITUTION:A wire cleaner 6 slides and rubs against an electric discharge wire 1 and removes an adhering foreign matter by a cleaner pad 7 provided on the wire cleaner 6. Also, the wire cleaner 6 is started, for instance, when a power source switch of a copying body has become ON, and a fan 24 is rotated in reverse to usualness. Usually, the cleaner 6 executes one reciprocating motion and stops at its original position, and at this time, the rotation of the fan 24 is stopped by a controlling circuit 21. Thereafter, when copying is started, the fan 24 rotates as the wind flows, in the direction as indicated with an arrow (a), allows air containing ozone generated in an electric discharge device 3 to pass through a duct 23, and to pass through an ozone decomposing filter 22, and it is discharged to the outside of the machine. In such a way, the cleaning efficiency of the wire cleaner can be raised.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a charging device for a copying machine equipped with a wire cleaner and an ozone suction fan.

(Prior Art) In this type of charging device, if toner, dust, etc. adhere to the charge wire, uneven discharge, leakage, etc. will occur.

For this reason, wire cleaners have traditionally been used to remove dirt (toner, dust, etc.) from the wire, and the contaminants are scraped off by rubbing in the axial direction of the wire. Substances may re-adhere to the inner surface of the casing, or in the case of a scorotron charger, dirt may adhere to the grid under the discharge wire, resulting in problems such as uneven discharge and leakage. The disadvantage was that it made it easier to do so.

(Objective) It is an object of the present invention to eliminate such drawbacks of the conventional example and to effectively remove contaminants adhering to the charge wire.

(Structure) For this purpose, in a charging device equipped with a wire cleaner and an ozone suction fan, when the wire cleaner is activated, the fan is reversed to discharge contaminants attached to the charging wire to the outside of the charger. It is characterized by causing

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Fig. 1 is a cross-sectional view of a scorotron charger according to an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a block diagram of the fan drive mechanism, and Fig. 4 is its control circuit diagram. , FIG. 5 is a timing chart of forward and reverse rotation of the fan.

In FIG. 1, reference numeral 6 denotes a wire cleaner body, which slides on the charge wire 1 with a cleaner pad 7 to remove foreign matter such as toner and dust attached to the wire 1. Further, 2 indicates a grid wire, and 13 indicates a casing.

Further, on the opposite side of the charger 3 from the photoreceptor 20, there is a duct (23 in FIG. 3) for sucking ozone generated in the charger 3.
) is provided with an opening 12 for connection thereto.

In FIG. 2, the corona discharge wire 1 is supported at both ends by end blocks 4 integrally formed with the shield case side plate 13.

8 is a motor, and this motor 8 drives pulleys 9 and 9.
The drive is transmitted to ', and the drive wire 10 stretched between the two pulleys is moved in a certain direction. The wire cleaner 6 is fixed to the wire 10 at a portion 11, and a cleaner pad 7 provided on the wire cleaner 6 rubs the discharge wire 1 to remove attached foreign matter.

Next, the concept of fan drive will be explained based on FIG. At the start of copying, the fan 24 rotates so that the air flows in the direction of arrow a, so that the air containing ozone generated in the discharger 3 passes through the duct 23 and finally passes through the ozone decomposition filter 22. and is ejected from the aircraft.

By the way, the wire cleaner 6 is started and cleans the wire 1 when the power switch of the main body of the copying machine is turned on, for example (a switch for operating the wire cleaner may be provided).

In the present invention, when the wire cleaner 6 is operating, the fan 24 is rotated in the opposite direction to the normal rotation, and the foreign matter removed from the wire 1 is discharged to the outside of the charger 3 by the generated wind. It is characterized by

First, when the power switch of the main body of the copying machine is turned on, the signal is sent to the control circuit 21, which drives the motor 8 for driving the wire cleaner. At the same time, a signal is sent to rotate the fan 24 so that the air flows in the direction of the arrow.

The wire cleaner 6 rubs the wire 1 with a pad 7 to remove foreign matter such as toner, paper dust, and dust.

By the way, some of the foreign substances attached to the wire 1 are electrically charged, and can be quickly removed by blowing air from the fan 24 without re-attaching to other parts, such as the casing 13 or the grid wire 2.

Normally, the cleaner 6 makes one reciprocation and stops at the original position.

At this time, the control circuit 21 stops the rotation of the fan 24.

At the start of copying, the fan 24 is controlled to suck in the direction of arrow a.

Furthermore, by blowing air, foreign matter can be removed and discharged by the force of the wind.

Next, one embodiment of the fan drive will be specifically described based on FIGS. 4 and 5.

Under normal conditions, the fan emits ozone (arrow a in Figure 3).
It rotates (forward rotation) in the direction of When the switch 100 is turned on here, an "L" signal is input to the flip-flop (S-R flip-flop) 110, and Q becomes rHJ. This activates the relay 104, switches the switch of the fan 24, and reverses the fan (
The wind flows in the direction of the arrow in Figure 3).

At the same time, current flows through the wire cleaner motor 8, causing it to rotate. As shown in FIG. 2, when the wire cleaner 6 moves and hits the end of the charger 3, an overcurrent flows and the integration circuit 1
05, the voltage at one terminal of the connected comparator 106 increases, and the output of the comparator 106 becomes rLJ. The photocoupler 107 is activated by the LJ multiplied signal, and the rLJ signal is input to the mono multi 108. Then, one shot of Q of the mono multi 108 is output, but at the falling edge, a flip-flop (toggle flip-flop) ) 109 operates, the output becomes r HJ, and the relay 102 is activated.

As a result, the cleaner motor 8 is switched to the No side,
Motor 8 reverses. Thereafter, the wire cleaner 6 returns to its original position and stops. When the overcurrent flows through the motor 8 again, the output of the comparator 106 becomes rLJ, the photocoupler 107 operates, and the input A of the monomulti 108 becomes rLJ, and when the output Q of the monomulti 108 becomes rHJ, the output of the flip-flop 109 becomes rLJ. Since the output Q is rHJ, a reset signal is input to the flip-flop 110 by the NAND gate 111.

As a result, the flip-flop output Q returns to "T5", the cleaner motor 8 stops, and the fan 24 rotates normally again by turning off the relay 04.

For example, the flip-flop may be 74LS76, the monomultiple may be 74LS121, and the NAND gate may be 74LSOO. Further, the switch 100 may be a dedicated switch or may be linked to a power switch.

In FIG. 5, A is the fan 24, B is the flip-flop 110, C is the cleaner motor 8, and D is the monomulti 10.
8, E is flip-flop 109, F is Nantes gate 1
11 waveforms are shown, T1 is the switch ON timing, F
2 indicates the timing at which the wire cleaner hits, and T3 indicates the timing at which it returns to its original position.

(Effects) As described above, according to the present invention, the cleaning efficiency of the wire cleaner can be improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a scorotron charger according to an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a block diagram of the fan drive mechanism, and Fig. 4 is its control circuit diagram. , FIG. 5 is a timing chart of forward and reverse rotation of the fan. 1... Charge wire, 6... Wire cleaner, 2
4...Fan'.

Claims (1)

[Claims] A charging device for a copying machine equipped with a wire cleaner and an ozone suction fan, characterized in that when the wire cleaner is activated, the fan is reversed to discharge contaminants attached to the charge wire to the outside of the charger. Device.