JPS5879276A - Image forming device - Google Patents

Abstract

PURPOSE:To form a good image always even after having a long pause time, by operating a cleaning liquid supplying means in accordance with a detecting time in a detecting means for pause time and by arranging to move an image supporting body after a prescribed elapsed time. CONSTITUTION:A developer 5 in a developer storing tank 4 of a liquid developing means 2 is used as a cleaning liquid, and when a main switch is turned on, a liquid transporting means 6 such a pump is operated by a driving source 7 and the developer 5 in the tank 4 is supplied to a blade 11 and the surface of a photoreceptor 1 from a tube 9 through a distributing means 8. During the time of liquid supply in accordance with the pause time which is detected by a detecting means for detecting the pause time of a device, the photoreceptor 1 is not rotated and the caked toner on the surface of the photoreceptor in the vicinity of the blade 11 is made wet, and then the photoreceptor 1 is rotated and the developer is supplied to a developing tray 2' of the means 2 from the distributing means 8 and a liquid supply to a dispersing tube 10 is shut off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus that forms developed images on an image carrier and cleans the image while supplying developer remaining on the carrier after transfer. Regarding, Ru.

Conventionally, a 14Lm image is formed on a photoreceptor using the ``Seiko photography method'', and the fI! Various image forming apparatuses have been proposed and put into practical use in which the surface of a photoreceptor is cleaned and reused after developing and transferring an image. And in image forming apparatuses that employ a liquid development method.

It is customary to supply liquid to the cleaning section during cleaning. Particularly, in order to prevent the developer from sticking to the cleaning section during a long period of idle IE, a warming IJ-ning liquid is supplied before the start of movement of the photoreceptor.

Normally, the supply amount of the cleaning liquid and the time until the photoreceptor starts moving are set to be constant, and if safety is taken too seriously, the waiting time will be too long, so it is set to be an appropriate amount of time.

However, in the case of an apparatus that is used only a few times, the downtime is long and there is a risk of solidified developer being generated in the cleaning section. Furthermore, if the photoreceptor is moved with insufficient liquid supply, there is a risk of damaging the surface of the photoreceptor, and sometimes even the drive system gears for moving the photoreceptor may be damaged.

The present invention has been made in view of the above-mentioned points, and relates to a single-image forming apparatus that can always form good images.

The present invention provides means for detecting device down time in a single-forming device that forms developed images on an image carrier and cleans the developer remaining on the image carrier after transfer while supplying liquid. , a means for supplying liquid to the cleaning section, an image carrier moving means, and a cleaning liquid supplying means are operated according to the detection time of the rest time detecting means, and the image carrier moving means is not operated until a predetermined time elapses. It is characterized by having a control means for controlling the operation.

Hereinafter, details of the present invention will be explained with reference to specific examples and drawings.

1- is an explanatory diagram of a specific example image forming apparatus according to the present invention.

1 is a photoreceptor drum, which is rotated in the direction of the arrow. 0 A liquid is being developed at the bottom of the photoreceptor drum y! 〇i! 2 is disposed, and on the other hand, a cleaning means above the rotating drum 11 is disposed.

The cleaning liquid supply means in the figure @5L is configured to use the developer in the developer storage tank 4 of the 10th stage 2 as a cleaning liquid, and is used to drive the liquid transfer means 6 such as a heart pump. Ryo 7 operates and the current gI liquid 5 in tank 4
is sent to the tube 9 via the distribution means 8, and is supplied to the blade 11 and the photoreceptor surface from the dispersion tube IO provided at the other end of the tube 9. The supplied liquid flows left and right along the blade and is recovered from a groove (not shown) provided at the end 11111 of the photoreceptor 1. As will be described in detail later, the amount of liquid supplied per hour depends on the downtime.The photoreceptor 1 does not rotate and the blade and its vicinity are wetted; the solidified toner on the body surface is wetted.

Next, the photoreceptor 1 is rotated to advance the copy process, and at the same time, the distribution means 8 is (rotated) to switch the supply of the developer from the liquid transfer means 6 such as a pump to the developing plate 2' of the developing means 2. It is designed to direct the supply to the dispersion tube 10.

Since we are using a pneumatic corona discharger13. 0 or 15 where the secondary corona discharger 14 is provided is information irradiation light; 16
1 is a transparent plate, and 17 is a full-surface exposure source.

These form a reservoir. On the other hand, the image on the surface of the photoreceptor developed by the developing means 2 is squeezed out of excess liquid by the corona emitting IL device 18 and prepared for transfer. 19 is a conveyance roller;
Reference numeral 20 denotes a conveyance guide that supplies the transfer material 21 to the transfer position from a supply section (not shown). 22 is a transfer corona discharger that transfers the developed images on the surface of the photoreceptor onto a transfer material. After the transfer is completed, the transfer material is separated by a separation roller 23 and fixed by a fixing device (not shown). The subsequent surface of the photoreceptor is cleaned by the cleaning means 3. Reference numeral 24 is a sponge roller for separating the developer.

FIG. 2 is a block diagram of the liquid supply system @U path of the above device.

FIG. M3 is a timing explanatory diagram showing the operation timing of the device.

In the circuit block diagram of FIG. 2, only the pause time detection means and the amplifying section (encircled by broken lines) show a specific circuit configuration example. R1-&-Rs is resistance, C is Contin')-1FE
T is a detection amplifier, and 25 is a microprocessor.
126 is 0 during rest. The capacitor C is used to determine the rest (or standstill) time, and its discharge state is detected as follows. First, when the main switch SW is turned on, the microprocessor 5
This causes the quick start time switch to turn on, giving a capacitor potential output to the amplifier FNT. A
/D.

The detection output is converted into a digital signal by the converter 26 and is input to the microprocessor 25.

The liquid supply driver 29 is turned on according to the time 1 m set in response to this detection signal. During this time pump 30
operates to supply liquid to the photoreceptor cleaning section 0 (pre-wet operation) Then, as time t1 elapses, a VC drum drive signal is output and the drum drive of the apparatus is started. At the same time, this drag switch switches to the No side and starts charging the capacitor C via the resistor island.
Switch to C11lil 4Qe, and make a conde. ,
The resistor R is selected to have a resistance value such that the capacitor photoelectrically emits light while the drum is rotating. Also, discharge resistance R3
The resistance value of the sensor is determined depending on how long the sensor is left unused, and a sensor with a fairly high resistance value when energized is used. In addition, the relay switch is installed to cut off the connection between the ρ gate of the FET and to prevent leakage from the FET's ρ gate when the capacitor is discharged. The value is the number of detections II! DI iff: can also be omitted if the time required is short.

As described above in detail in the specific examples, the present invention apparatus N! T is for example a rugged body! Even after spraying for L hours, both species are formed well ■1
It's hot.

[Brief explanation of the drawing]

FIG.
Fig. 1 is a block diagram of the liquid supply control circuit of the device; Fig. 3 is a timing diagram explaining the operation timing of the device; , 4: Developer storage tank 5: Current 1j! &,
6:? Transfer means % 10: fi tube, 11 blade, 25: microprocessor. Embroidery artist: Canon Co., Ltd. ν゛゛1 Agent: Gi Marushima

Claims (1)

[Claims] (1) In an image forming apparatus that forms developed images on an image carrier and, after transfer, cleans the developer remaining on the image carrier while supplying liquid, means for detecting apparatus down time. A means for supplying liquid to the cleaning section. An image carrier moving means. njI An image forming apparatus characterized by having a control means for operating a cleaning liquid supply means in accordance with the detection time of the rest time detection means and for inactivating the image carrier moving means until a predetermined period of time has elapsed. .