SU473382A3 - Electrophotographic Development Device - Google Patents

Description

between the values of the potentials of the image areas and the gap areas. The grit is thrown away to the image areas, and the 1x areas are repelled from the nibelia1. Electrode 7, located at the end of the zone of development, has a high note, allowing it to serve as a chip, as an electrode.

The C-meshed device 8 delivers the PA electrode 7 an offset higher than the thermal section of the image regions PA 300 V. The electrode 7 forms the bottom wall of the intake tray. The opposing wall is formed by a dielectric shield 9, the outer edge of which, together with the upper edge of the electrode 7, forms the inlet opening 4. The shield 9 is grounded or connected to it, which repels the destructor. The configuration of the input tray and the magnitude of the electric field in this area are such that the formation of an aerosol cloud of the developer is minimized.

A sensitive device for periodically measuring the coitrol papa of the photo-half-layer water layer contains a gap 10 attached to the frame of the machine between the exposure units and the built, sliding shutter 11, the potential of which is equal to the ground potential, which is activated by the saltioid. The shutter 11 is connected to the solenoid through the crank 12. The crank arm 12 is sharpio ustaleleio pas axis 13, and this axis is mounted in the body of the casing. The lower end of the crank arm 12 is pivotally attached to the drive shaft of the solenoid, while the opposite end of the latch is likewise connected to the downward bend of the rim 14, which runs at the bottom of the curtain 11. The finger 15, which passes through the upper part of the crank arm, moves in a groove and directionally vertical, forming the first in the side 14 and allowing the crank 12 to move and move the shutter 11 horizontally during rotation of the crank 12. When cranking the crankshaft, the curtain 11 moves backward, opening the measuring shchun I) from the side of the top of the drum unit 1. During the action, the salt-poid is excited once every time in each copy cycle.

The circuit device 16 supplies the probe with a triggering signal detected by the circuit 17, generating control output, but connected to the mixing device 18, connected to the developing electrode 6. The triggering signal generated by the logic circuit has a pulse duration of approximately 0.5 m / s and And a repeat of about i, 5 seconds between automatic copy cycles. First, the pullback signal is fed to the probe and the circuit 17 and fed to the input terminal 19 (Fig. 4). The incoming sigal passes to the base of the trapsistor 20, causing a tripping of the traysistor. For the duration of the trigger pulse, transistor 20 is in a conducting mode.

activating the coil of the shutter relay 21 11. When catuppchi is energized, the driving arm of the solenoid knocked out, caused the shutter 11 to move the jade and open the slides 10 with respect to the drum surface. At the same time, Shchun 10 sends a sushi, corresponding to the gap of the gap sections, to an electric amplifier 22, from where, through two 23-24 stays with a higher gain, the sigal arrives at the fpsacci circuit, consisting of one high-resistance south-south amplifier amplifier 25 and a capacitor 26

Pervpachalpo this sigial is not passed into the circuit at the expense of openly cokgkta 27. The generated signal from 1.5 to 6.5 volts pronorponalepnapropy gaps from 0 to 500 volts.

The probe 10 (FIG. 3) contains a sensor element 28 surrounded by an insulator 29,

not reagent on the change in humidity, around which the electrically conductive screen 30 is located, connected to the feedback output of the electric amplifier 22.

The trigger signal goes to the transistor 31 (Fig. 4), which serves in the circuit equalized for opening and closing the contact 27. The initiating impulse switches on the conductive mode of the transistor, the output signal from the emitter of which is fed to the single-stable multivibrator 32. The odiostable multivibrator locks delays the input signal for about a period of 0.16 sec, during which the shutter 11 is in the fully open position. Then the sigpal passes to the second one-stable multi-vibrator 33, which, but receiving a delayed signal, generates an output pulse signal for approximately 0.22 seconds.

The output signal from the multivibrator 33 nostunast to the base of the traizistor 34, including it. As a result, the flow of the current excites the coil 35. When the coils are energized, the contact 27 in the fixing circuit closes and

The voltage is not transmitted through a high-impedance amplifier unit 25 (FNG. 3).

When contact 27 is closed, two discrete cases may occur. First, the repro test trial of pa

through the high-resistance amplifier 25, and secondly, the co-distributor 26 in the fixing circuit is also charged before this cruise pair. The end of the second pulse signal with a duration of 0.22 seconds locks the window

sampling by cut-off the trapsistor 34. At this time, the circuit of the coil 35 is interrupted and the contact 27 is opened. However, the initial test voltage that has been applied to capacitor 26 remains

applied to the amplifier 25. During the fixing period, a comparatively constant output is maintained until the next re-closure of the contact 27 does not establish a new test voltage. it

The output circuit is supplied to the operational power amplifier 36 (Fig. 3), which maintains a relatively constant power during a short generation period, and the fixed source waits for the next irobic signal.

If the voltage level of the next test signal differs from the value of the first signal, the capacitor is again charged to this value through co-act 27 by means of an amplifier 24. The new test voltage is applied to the high-resistance fixed amplifier 25, and the capacitor is charged to a new value of voltage. At the end of the sampling period, coitact 27 is opened, and again there is a waiting list for the next sample.

A zaphsk judesny signal is also fed to the base of the transistor 37 n includes it. The inverted output signal is sent from the collector of this transistor 37 to the first of a pair of series-connected single-stable multivibrators 38 and 39. At the end of the trigger signal, a single-stable multivibrator 38 is turned on, creating a pulse with a duration of about 0.24 sec. During this delay period, the coil of the solenoid curtain II is turned off, and the H1 switch is completely closed. Then the delayed signal passes to the second one-stage multivibrator 39, which produces an output signal with a pulse length of approximately 0.24 sec.

The output sigiel from the one-stage MULTIVibr of the top is fed to the base of the second transistor 19. The transistor 40 transmits the inverted signal to the key circuit, executed on the dyads 41 and 42. Inverted the normal operation of the device, the inverted signal was transmitted through the diode 42 providing a ground signal for an electrometric amplifier 44. This signal is fed to a key device (not shown) in an electrometric amplifier circuit, which grounds the input circuit during a delay period of 0.24 s, during which the face of the rod 28 measures the land of the closed curtain. Thus, during a period of 0.24 s, during this key signal, the high-impedance Amplifier 22 is provided with a zero potential potential reference once during each cycle of the apparatus (P, 5 s). This eliminates errors due to the drift of the electrical characteristics of the amplifier 22 over time.

When the copying process begins, i.e., when the lenses scan the original on the plate, the transistors 4.5 and 46 are also fed with a trigger that causes the conductive mode of these transistors. The voltage received at the emitter of transistor 46 is applied to diode 41. Diodes 41 and 42 form a switch that passes

only the lower of the two input slots to the base of the transistor 43 and, therefore, locks the amplifier 41. The backplane diode is a high resistance to the laser generated by a single-stage multiplier 39, and thus signals through the DIO. A VO diode and transistors the transistor to the transistor, and thus passes through the DIO. The capacitance 47, located in the branch of the base of the transistor 45, fixes the tracer 45 and 46 in the wire of the first state during the short iriod between the copy cycles, therefore keeping the diode in reverse mode during this time. th period. This is the second state

5 The initial imiulus with a duration of 0.24 s passes through the bottom 42 into the transistor 43 to the amplifier, as described in the last example.

However, the inactivity of the scrambled system for any prolonged period of time causes the discharge of capacitor 47, and the diode 41 transmits a zero voltage from the emitter of the transistor 46 to the base of the transistor 43. At this time, the transistor 43 is turned off by sending a ground signal5

nor to the valve of electrometric amplifier. As it can be seen, the electrometric amplifier is non-intermittently grounded by a device at any time during the operation of the machine, during a lawsuit for two weeks, which koiys are received, and continuously sends trigger pulses to the input terminal 19.

Subject invention

35

1. The device is an electrophotographic apparatus, the content of an electrically insulated nro is a youth electrode located in the development zone in which

Insert, interwave, between the iHHM electrode and the photo-semiconductor layer, a sensitive device. For analyzing the test pattern and generating the output, the mixing device,

connected to iro vl yun, to him an electrode and sensitive device, about tl and h and junees by the fact that, in order to diminish the quality of iro liping, the sensitive device is disconnected to follow the on-line voltage on the photoconductive layer with a latent image, a means for transforming tsmmeennogo voltage in the output sigal, to which the shifting blue device reacts.

2. Device no. 1, characterized by a tel1, that the sensing device contains a shutter located between the tongue and the photo-semiconductor layer, and means for its flow.

3. The device io p. 1, of tl and h ay Ilee e with tel. that the music and the torques are equal to the potential of the earth.