JPS6193458A - Electricity conduction control device - Google Patents

Abstract

PURPOSE:To obtain satisfactorily a copy image by restarting of copying regardless of a low temp. and high humidity by providing compensation heaters for heating a photosensitive body, developer, exposing lamp, etc. after breaking of AC load. CONSTITUTION:Fan motors FM1, 2 operate when a power source switch MSW is turned on. The starter ST of the exposing lamp 16 is then conducted with electricity for preheating and a CPU turns on a triode AC switch TA3 so that a fixing heater 46 generates heat. TA2 is turned on to light normally a lamp 16 and a TA1 is turned on to rotate a drum 15. The corona discharge of electrostatic chargers 21, 22, 30, 31 is started by turning on TA4, TA5. A relay (k) is energized by the signal from the CPU to change over contacts R1-R4 and to turn off the starter ST, the heater 46 and the FM1, 2 upon lapse of the specified time after the end of copying. The conduction of electricity to the heaters H1-H4 for compensation is then set by the contact R3. The DC power source maintains the electricity conduction state and the restarting of the process is made possible simply by turning on a copy button.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an energization control device that automatically shuts off an electric current directly in front of a fan or the like.

Conventionally, it is known that when copying is completed, all electrical loads are automatically cut off for a certain period of time. In this case, the power to the DC control circuit that drives the load is also turned off, so even if you try to restart it after that, you will have to go through various preparation processes and will not be able to restart it smoothly. Discontinuing energization causes various problems such as power consumption, load lifespan, and noise.

The present invention eliminates such drawbacks, and after copying is completed,
While continuing to energize the DC control circuit that outputs signals for copying, various displays, etc., the exposure lamp preheating circuit,
This is to cut off power to AC loads such as fans. As a result, even if the power remains on, power consumption and noise can be reduced, and copying can be resumed smoothly. In other words, during the pause period after copying is complete, the live DC control circuit can check and display the presence or absence of copy paper developer, etc., so it is possible to take action before restarting copying, and copying can be performed immediately when commanded to resume copying. becomes.

Further, the present invention provides a compensation heater or the like for heating the photoreceptor, developer, exposure lamp, etc. that have atmospheric characteristics such as temperature and humidity after cutting off the AC load, thereby compensating the environment of the developer and exposure lamp. Therefore, it is possible to obtain a good copy image by restarting copying regardless of the low temperature and high humidity.

The present invention is particularly effective when a computer processor is used as a DC control circuit having a memory programmed with a load operating procedure for executing copying and a condition checking procedure such as checking the presence or absence of copy paper.

Examples will be described below with reference to the drawings.

FIG. 1 is a sectional view of a copy control device of the present invention. To explain the operation, first, when the main switch is turned on, it takes a short time (about 4 seconds in this case) to reset the digital control circuit and start up other electrical systems, and then a three-layer photoreceptor is applied to the surface. The photosensitive drum 15 is rotated. A VC clock pulse generation mechanism is provided as part of the drive system so as to generate approximately n clock pulses per rotation of the photosensitive drum. When the photosensitive drum 15 starts rotating, it first rotates once or almost once for n clock pulses.

This can be considered as a step before entering the copying process, and may be omitted in order to make a high-quality copy when the copying process begins. Here, if the copy button 13 is turned on, the copying process will proceed directly. First, when the copy button 13 is turned on, the photosensitive drum 15 rotates n' times, and then the document table 2 with the document placed on the document table glass 5 starts to be illuminated by the illumination lamp 16, and its image is transferred to the reflection mirror 17.
, the drum 15 is exposed at the exposure section 19 by the in-mirror lens 18.
image on top.

The photosensitive drum has a seamless photosensitive member around the circumference of the drum, resulting in efficient surface usage.

As the photoconductor dome 15 continues to rotate, the surface of the photoconductor, that is, the photoconductive layer, is covered with a transparent insulating layer.
It is charged + by the corona current from . Subsequently, when reaching the exposure section 19, the image of the subject illuminated by the illumination lamp 16 is slit-exposed onto the photosensitive drum 15. At the same time, it is AC charged by an AC charger 22 to which AC high voltage is supplied from a high voltage power supply 20. Then, a high-contrast electrostatic latent image is formed on the drum surface by full-surface exposure using the full-surface exposure lamp 23,
Enter the next developing process. The developing device 24 includes a container 26 that holds a developer 25, a pump 27 that stirs the developer and pushes the liquid to the contact area. It consists of a developing electrode 28 and an electrode roller 29, which rotates in close proximity to the drum and has one end grounded, in order to remove any fog in the image visualized on the drum. The electrostatic latent image formed on the photosensitive drum 15 is developed by the toner in the developer 25 pushed up onto the developing electrode 28 by the pump 27.

Next, the post charger 30 receives a high voltage charge from the high voltage power source 20 and apertures excess developer on the photosensitive drum 15 without disturbing the image. Next, the transfer paper 7 sent from the paper feed section is closely monitored by the photosensitive drum 15, and the transfer charger 31 charges the photosensitive drum 15 with an electric field caused by a high voltage from the high power source 20.
The upper image is transferred onto transfer paper 7. After the transfer, the transfer paper 7 is separated by a separation belt 32 and guided to a drying and fixing section 33. The photosensitive drum 15 is pressed against the blade cleaner 34
The remaining toner developer is wiped off at the edge portion 35, and the next cycle is repeated again. The developer wiped by the blade cleaner 34 is guided to the developing device 24 through grooves 36 provided at both ends of the photosensitive drum 15 and used again for development.

The transfer paper 7 is stored in a cassette 6, which is removably attached to a paper feed section at the lower left of the machine, and various types are prepared depending on the size of the transfer paper. When the document table reaches a predetermined position, the actuating piece 161 fixed to the document table activates the detection means on the main body side and outputs a signal, and the constantly rotating paper feed roller 40 descends to feed the cassette. The transfer paper comes into contact with the uppermost transfer paper in the cassette 6, and moves with the separating claw 39 to separate one copy of the transfer paper and send it out from the cassette 6. However, since the register rollers 41 and 42 in the immediate vicinity stop at the same time as the paper feed roller 40 descends, the transfer paper 7 sent out from the cassette 6 is sent to the guide 43 with its leading edge touching the contact part of the register rollers 41 and 42. , 44 to create slack. Then, when the paper feed roller is about to rise, the register rollers 41 and 42 rotate again in time with the leading edge of the image on the photosensitive drum, and the transfer paper 7 is fed at a speed that matches the circumferential speed of the photosensitive drum 15.

Figure 2 shows a circuit for controlling the operation of each part in Figure 1;
The figure is the time chart.

In Figure 2, AC is an alternating current power supply, DSW is the door switch that turns off when the side panel of the copying machine in Figure 1 is opened (the state shown in the figure), and MSW.
is the power switch on the copier control panel (the figure shows the off state)
, DRM is a motor that rotates the drum 15, ST is a starter that turns on the lamp 16, FM is a fan motor that cools the internal optical system (200 in Figure 5), and FM2 is a heater that sucks outside air. blower motor (Fig. 5 20)
1) REC is a rectifier that rectifies the AC voltage stepped down by transformer Tγ1 to +V1, CPU is a central processing circuit that generates control signals to control the copying machine, and HVT is DC-A
A converter TAI that includes a C converter and a transistor that boosts its output; a triac that turns on and off the DRM;
A2 is a triac that turns on and off the lamp 16, TA3
is a triac, TA4, that turns on and off the fixing heater 46.
is the charger 21, 30, 3i, TA, 5 is the triac that turns on and off the ACC 16 unit 22, Hl is the heater for preheating the fixing heater, H2 is the heater that is stretched along the inner circumference of the drum, and heats the photoreceptor. Planar heater for
is a heater for heating the fluorescent lamp 16 for exposure, H4;
TMS1 and TMS2 are thermo switches that turn off H3 and H4 at 25° C. or higher and 10° C. or higher, respectively.
D1 is a diode that supplies half-wave power to H1, H2, and H3, and K is a relay that switches contacts k1, k2, and k3.

The operation will be explained with reference to FIG.

When the side plate is closed and the power switch MSW is turned on, the fan motors FM1 and FM2 are operated, and the starter ST of the exposure lamp 16 is preheated and energized via the contact point 1. The signal for resetting the control circuit is C for a certain period of time after the DC power is turned on.
Generated from PU. 1. When , the CPU
The motor signal is outputted to rotate the agitator 27 to agitate the current trench liquid. Furthermore, a pulse signal that turns on triac TA3 is output to cause the heater 46 to generate heat, a pulse signal IEXP that turns on TA2 is outputted to fully light the lamp 16, and a pulse signal DRMD that turns on tA1wo is outputted to cause the heater 46 to generate heat. 15 and outputs pulse signals HVDC and HVAC that turn on TA4 and TA5.
Corona discharge is started from 1, 22, 30, and 31, and a pulse signal AEXP is output to expose the entire surface of the lamp 23.
lights up.

The above output is held until t2. This opening is a so-called waiting time, and copy start cannot be started. The drum 19 rotates several times to clean the surface.

After t2, the mode shifts to standby mode, and power supply to the drum motor, lamp 16, and each charger is stopped.

If you turn on the copy button in this mode (signal CCPB
) The load that was previously turned off is turned on again to perform preprocessing before the static image forming process, and at time t3, the advance signal CL1 is output to start the operation of the document table 1. By t3, the drum has made about one revolution to clean the surface.

When the exposure scan (forward movement) ends at t4, CL1, IEXP,
The HVDC signal is turned off, and the lamp 16 and charger 21 are turned off. Then, the signal CL2 is turned on to switch to double movement, and the document table moves to the original stop position and stops.

DVLD, DRMD, HVAC, AEX up to t3
P continues to be output, the transfer process is completed, and the drum continues to rotate several times while the process is in progress to remove the residual toner on the drum surface and eliminate the residual charge.

The period from t3 to t4 is the same mode as the standby mode described above, and the fan, heater, and lamp starter circuit are in operation. If the copy button is turned on again during this time, the copying process will begin in the routine described above.

However, once t5 is reached, the load on the fan and the like is also turned off. In other words, at this point, the signal SOF from CPV
F is output to excite relay k and switch its contacts k1 to k4. As a result, starter ST, heater 46, FM
Turn off 1 and 2.

Then, energization of the compensation heaters H1 to H4 is set by the contact k3.

The heaters H1 and H2 generate heat by a half wave of 12.5 W via the diode D1 regardless of the humidity.

The humidity of H3 and H4 is controlled by thermoswitches TMS1 and TMS2.

That is, in the second standby mode, most of the AC loads other than the compensation unit are turned off, thus eliminating noise caused by fans and the like and power consumption by heaters and the like.

TMS1 and 2 are provided near the side cross section of the drum.

In this mode, the DC power supply remains energized, so you can restart the process simply by turning on the copy button.

In this mode, even if the power switch is turned off, the signal SOFF is turned off, so the relay returns to the state shown in the figure, and the compensation operation of the heaters H1 to H4 continues.

In this mode, when the copy button is turned on again, the signal SOFF is turned off and the heaters H1 to H4 are turned off. Then, after the initial time t1, exposure of the original is started in the same manner as in the step of CPB described above.

Furthermore, if the copy button is not turned on even after t2 after the power switch is turned on, FM1, 2, and DVD will be automatically turned on at t.
, FHT, IHXP' (D signal is shifted off-site to the second standby mode ST2. This prevents damage to the drum surface and power wastage. The chart in this case is shown by the dotted line.

The time from t1 to t2 is set according to the time when the power switch is off, and the time from CPB to t3 is also set according to the time of second standby ST2, and both of them are set according to the time when the power switch is off. This is determined by determining the standing time from the concentration of the developer (the degree of sedimentation of the toner).

FIG. 4 is a circuit diagram of the CUP in FIG. 3, and FIG. 6 is a circuit diagram of the CUP in FIG.
This is a flowchart for executing the process sequence of FIG. 3, which is previously stored in the program memory ROM of the CUP of FIG. 4 as a binary code signal.

RAM program memory data, data memory for storing input signal data such as the number of copies, INPUT is an input port that gates in input signals, 0UTPUT is an output port that launches output signals, ACC is data from the input port, Accumulator that temporarily stores data to the output port, decoder that decodes the ROM code, ROM, R
A that calculates and logically determines the data from the AM input/output port
It has the function of LU. Input port INPUT
Terminals 1 to 4 of the A port are connected to the signal CPB, which becomes 1 when the copy button is turned on, and the developer concentration signal (1 when the concentration is below the standard concentration).
) The document platen reversal position signal BP and stop position signal HP are input, and the output port 0UTPUT outputs D ports 1 to 4 to AE.
XP.

HVAC, DRMD, CL1, CL2 signals are output from h, +<-to 1 to 4 to HVDC, IEXP, DVL
D.

PHT and SOFF signals are output.

Here, the input data is taken into the ACC in a specific step according to the execution of the program in the ROM, is logically determined, and then proceeds to another step to control the copying operation load.

FIG. 6 is a flowchart of program steps stored in ROM. When the power is turned on, the developer concentration detection circuit (not shown) is energized, and the concentration value N is first detected by C.
Reads from import A of PU. Its value is N
It is determined in step S-3 whether or not the following is true, and if the following is the case, it is assumed that the machine has been left unused for a long time, and pre-treatments such as stirring the developer and cleaning the dry drum surface are performed. . Steps S-2, S-4, 5-5d
So L1 is DRMP, HVAC, AEXP, DVL
The load caused by D and L2 are the loads caused by IEXP and HVDC. When the temperature is below N, a timer for T2 is activated, and during that time L1 and L2 are turned on to bring the drum surface to fW, cleaning it, and making the photosensitive characteristics of the photosensitive member normal. After time amplification, the process proceeds to step 8-6. At this time, the density is N.
If it is 0 or more, preprocessing is performed for 6 hours, which is half the time of Tt (SS).

In step S-6, it is determined whether the A pitch of the memo IJ RAM is 1, and the next step is selected. Since the flag person cannot be completely set unless the copy button is turned on, proceed to step 8-7, turn off the CPU's D port and E port 1 and 2, and turn off the 9th port, , L, and so on.

Proceed to step S-8 and check whether the copy button has been turned on. If not, proceed to step S-9 and determine whether flag B is 1. Flag B is the end of Goby (L
J+j: A (S-17) 0 is set. Therefore, proceed to step 5-10 and set timer ll. The timer is formed within the CPU and is well known. At 8-11, it is determined whether T7 has time-amplified or not, but if it has not been uploaded, the process returns to S-8 and proceeds to the step of pressing the copy button. CP during this period as shown in the 4X3 diagram
When B is turned on, the process proceeds to 8-12, flag A is set, and the process proceeds to step 5-IK. Then, preprocessing is performed as described above (for a short time in the timer town), and the process proceeds to 8-6.

Since flag A was set in 5-12, proceed to 5-13, turn on the drive source clutch CL for advancing the document table, and start original exposure. Judging by 8-14 whether it has reached the reversal position #, S,
15 to remove the 9 load and carry out the fruiting process, 8
When it returns to stop position 16 at -16, it advances to 5-17 and flag I
Hit I, reset A, turn off clutch CL,
Start the timer. T is the post-rotation (one-rotation) cleaning time after the transfer is completed, and if the copy button is turned on during this period, copying starts again via S-8 and 8-1. When the copy button is not turned on, 5-9 determines whether flag B is set and proceeds to 5-is, where timer 1'5
Determine the close-up of. When the time comes up *WIL,
is turned off, the two-way switch B is reset, and the first standby state ST is entered. Then steps S-8, 8-9, 5-1
Timer T after 0°5-11? When the time amplifier is
Proceed to step 5-20 of auto shun-off tr□ 'M
Output COF F from output port F, turn off the fan motor, heater, etc.
Enter T).

In the flow of 9 soil, j) It is determined in step S-1 whether there is no paper in the cent or no liquid in the cent, and it is displayed, and the progress of my step is...
Only the stop display routine can be performed.

Also, the shunt off signal 8COFF is 41 standby time up! ! It is also possible to output when a jam occurs during the transfer of the transfer sheet.
swrcl! It is also possible to maintain the power supply of the DC control circuit regardless of A, and this makes it convenient to keep various displays on when opening the door to remove paper or otherwise clear a jam.

[Brief explanation of the drawing]

Figure 41 is a cross-sectional view of a base copy to which the present invention can be applied, @2
The figure shows an example of a control circuit using storage.
For example, a clear perspective view of Figure 1 of Mao 51/WJ it, Figure 6 is 70-Ayat of 嘱21A & I S1 in Figure 2 MSW Kei ml switch, D8Vfi door switch, F~11, 2 is the fan motor, K is the auto-shutoff relay, and H1 to H4 are the inverters.
=

Claims (1)

[Claims] (1) In a device that has AC loads such as an exposure light source and a fan, and a DC control circuit that controls the energization of these loads, after the rotational drive source is stopped, the DC control circuit is kept energized while the AC load is energized. An energization control device characterized by cutting off.