JPH0627937B2 - Drive circuit for load parts of automatic processor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a load component drive circuit of an automatic processor for driving a load component installed in an automatic processor.

[Problems to be Solved by Prior Art and Invention]

Generally, in an automatic developing machine, a developing solution is sucked from a developing solution tank by a pump and is circulated again into the developing solution tank to prevent the fatigue solution from staying around the photosensitive material to be immersed and conveyed.

Further, the developer needs to be replenished with a replenisher, that is, a solution containing a developing agent, an alkaline agent, etc., according to the amount of processing of the light-sensitive material. It is activated to replenish the replenisher. Further, the automatic developing machine also controls a heater and the like for adjusting the temperature of the developing solution.

As described above, the automatic developing machine is provided with a plurality of load parts, and the solid state relays corresponding to the quantity are installed.

Each of the solid state relays has a built-in zero-crossing detection circuit, and the control circuit (microcomputer, logic circuit) is affected by on / off noise and radio noise when the solid state relay supplies power to load components. To prevent malfunctions.

However, such a structure requires a number of zero-crossing detection circuits corresponding to the solid state relays,
The cost increases as the number of parts increases.

In consideration of the above facts, the present invention is 1 regardless of the number of load parts.
The zero crossing detection circuit can prevent the malfunction of the control circuit,
It is an object to obtain a load component drive circuit for an automatic developing machine in which the number of components is reduced.

In addition, the unit price of parts is reduced compared to the case where solid state relays each having a built-in zero crossing detection circuit are used.
The purpose is to reduce costs.

[Means and Actions for Solving Problems]

In the load component drive circuit of the automatic processor according to the present invention, a single zero-crossing detection circuit for detecting the timing of cutting the zero axis of the load component driving AC wave, and the operation of the load components arranged in the automatic processor are provided. Controlling means for controlling, and supplying an AC wave for driving the load parts to the load parts when an operation signal is generated from the control means and the zero crossing detection circuit detects the timing, and / or from the control means. A plurality of solid state relays that stop the supply of the load component driving AC wave to the load component at the time when the operation signal is stopped and the zero crossing detection circuit detects the timing.

Therefore, a single zero-crossing detection circuit can prevent malfunction of the control circuit.

〔Example〕

FIG. 1 shows an embodiment of an automatic developing machine 10 to which a load component driving circuit according to the present invention is applied.

A developer 14 is contained in the developer tank 12, and the photosensitive material 16 that has been exposed in the previous step is conveyed in the direction of arrow A in FIG. 1 and immersed therein.

The developer tank 12 is provided with a rack (not shown), and the photosensitive material 16 is guided by the rack so as to meander in the developer tank 12 as shown in FIG.

A drain pipe 18 and a liquid supply pipe 20 are attached to the side wall of the developer tank 12.

The drainage pipe 18 and the liquid supply pipe 20 are communicated with each other via a pump 22, and the pump 22 is driven by the driving force of a motor 24.
By operating the developer 14 in the developer tank 12
Is sucked out from the drain pipe 18 and sent again to the developer tank 12 from the liquid supply pipe 20.

As a result, the developing solution 14 is agitated, and the fatigue solution is prevented from accumulating around the photosensitive material 16 and causing defective development.

A filter 26 is interposed in the middle of the liquid supply pipe 20,
Impurities in the circulating developer are removed.

As shown in FIG. 2, the motor 24 for operating the pump 22 is controlled by the microcomputer 28. That is, the signal line 30 from the microcomputer 28 is connected to the solid state relay 32, and when the signal from the microcomputer 28 is transmitted to the solid state relay 32 via the signal line 30, power is supplied to the motor 24. It is like this.

Further, a heater 34 is attached to an intermediate portion of the liquid supply pipe 20 to heat the circulating developer 14 to prevent the temperature from decreasing.

Power supply to and disconnection from the heater 34 are also controlled by the microcomputer 28 via the solid state relay 36. As with the control of the motor 24, the microcomputer 28 and the solid state relay 3 are controlled.
The signal line 38 is connected to the signal line 6.

A temperature sensor (not shown) is provided near the heater 34, and the temperature measurement value of the developer 14 obtained by the temperature sensor is input to the microcomputer 28 to keep the developer 14 at an appropriate temperature (for example, about 38 ° C.). It is like this.

Further, by installing a temperature setting device (not shown) in the micro computer 28, it is possible to compare the temperature set by this temperature setting device and the temperature of the developing solution 14 by the temperature sensor to obtain a predetermined temperature. Become.

On the side wall of the developer tank 12, one end of the replenisher supply pipe 40 other than the drainage pipe 18 and the liquid supply pipe 20 is also attached.

The other end of the replenisher supply pipe 40 is attached to the replenisher tank 44 via a pump 42, and the replenisher 48 is supplied to the developer tank 12 by operating the pump 42 with the driving force of a motor 46. You can do it.

The replenishment solution 48 is replenished periodically according to the processing amount of the photosensitive material 16, and a processing amount detection sensor (not shown) is installed at the carry-in inlet of the photosensitive material 16 of the developer tank 12. There is.

The processing amount detection sensor can measure the width dimension of the photosensitive material 16 to be carried in, and the measured value is input to the microcomputer 28, and the processing amount is calculated as an area by the conveying speed of the photosensitive material 16, A signal is transmitted via a signal line 52 to a solid state relay 50 for driving the motor 46 at the replenishment timing.

The microcomputer 28 includes a zero crossing detection circuit 54.
Are connected.

In the present embodiment, the zero crossing detection is always performed in the microcomputer 28 so that the solid state relay 3 can be detected.
Transmission of signals transmitted to 2, 36, 50 (pulse signal)
The zero crossing detection circuit 54 detects the timing at which the zero axis is cut off at the beginning of the AC waveform for power supply from time to time, and at this time, the switch elements in the solid state relays 32, 36, 50 are activated, and the load parts (motor 24, 46 and heater 3
I am trying to supply power to 4).

As a result, the control circuit may malfunction due to radio noise, on / off noise, or the like generated when the switch elements in the solid state relays 32, 36, 50 are turned on except when the AC waveform of the AC power supply cuts the zero axis. It is supposed to be prevented.

The operation of this embodiment will be described below.

The photosensitive material 16 that has been subjected to the exposure processing in the previous step is the developer tank 12
And the developing process is performed.

Since the developing solution 14 in the developing solution tank 12 is circulated and agitated by the pump 22, the fatigue solution does not stay around the photosensitive material 16 immersed in the developing solution 14 to prevent defective development. be able to.

The circulating developer 14 is heated by the heater 34 while flowing through the liquid supply pipe 20 and is maintained at an appropriate temperature, for example, 38 ° C., so that there is no temperature drop due to developer circulation.

For temperature control, the temperature measurement value detected by the temperature sensor is input to the microcomputer 28. When this measured value is lower than the proper temperature (38 ° C.), an operation signal to the solid state relay 36 is generated when the measured value is low.

Here, as shown in FIG. 3, the zero crossing detection circuit 54 determines the timing of cutting the zero axis of the AC wave for power supply to the heater 34.
Then, the switch element in the solid state relay 36 is turned on or off.

That is, since the power supply is turned on when the voltage is 0, radio noise and on / off noise that occur when the switch element is turned on or off except when the AC waveform of the AC power supply cuts the zero axis can be prevented, and the microcomputer can be prevented. 28 does not malfunction.

Since the zero crossing detection of the AC wave for power supply is performed by the original power supply that supplies power to all the load components, noise is also generated when power is supplied to or cut off from the motor 24 that operates the developer circulation pump 22 described above. There is no such thing.

Further, the motor 46 for operating the replenishing pump 48 for the replenishing liquid 48 does not malfunction like the control of the heater 34, and the photosensitive material 16 is detected by the processing amount detection sensor.
The replenisher 48 can be reliably replenished only when the predetermined amount has been reached.

As described above, since the single zero-crossing detection circuit 54 prevents the control circuit from malfunctioning due to the turning on or off of a plurality of load components, the zero crossing circuit according to the number of solid state relays for driving the load components as in the prior art is prevented. Since it is not necessary to install the crossing detection circuit, the number of parts can be reduced and the cost can be reduced. Further, as compared with the case where a component having a built-in zero-crossing detection circuit is used, it is not necessary to provide a zero-crossing detection circuit for each component, so that the component unit price can be reduced and the cost can be reduced.

In this embodiment, three load parts (motors 24, 46) are used.
The heater 34) has been described, but the number of load components is not limited to this number, and it is not necessary to add the zero-crossing detection circuit 54 even if other load components such as solenoids are increased.

In addition, in this embodiment, the control means is a microcomputer 2
8 is used, but as shown in FIG.
6 and the AND circuit 58, the operation signal of the load component is output from the logic circuit 56, and the AND circuit 58 obtains the logical product with the zero-crossing detection (pulse wave) in the zero-crossing detection circuit 54. Solid state relay 3 only
2, 36, 50 switch elements may be activated.

〔The invention's effect〕

As described above, in the load component drive circuit of the automatic processor according to the present invention, a single zero-crossing detection circuit for detecting the timing of cutting the zero axis of the load component drive AC wave, and the load arranged in the automatic processor. Control means for controlling the operation of the parts,
When the operation signal is generated from the control means and the zero-crossing detection circuit detects the timing, the load component driving AC wave is supplied to the load component and / or the operation signal from the control means is stopped. Further, by having a plurality of solid state relays that stop the supply of the load component driving AC wave to the load component when the zero-crossing detection circuit detects the timing, the number of load components can be reduced. In addition, a single zero-crossing detection circuit can prevent a malfunction of the control circuit and reduce the number of parts. Alternatively, it has an excellent effect of reducing the unit price of parts.

[Brief description of drawings]

FIG. 1 is a piping diagram of the automatic developing machine according to the present embodiment, FIG. 2 is a circuit diagram when a microcomputer is used as a control means, and FIG. 3 shows conduction and interruption states of switch elements of a solid state relay. FIG. 4 is a circuit diagram when a logic circuit and an AND circuit are used as the control means. 10 ... Automatic developing machine, 28 ... Micro computer, 32, 36, 50 ... Solid state relay, 54 ... Zero crossing detection circuit.

Claims (3)

[Claims] 1. A single zero-crossing detection circuit for detecting a timing of cutting a zero axis of an AC wave for driving a load component, and a control means for controlling an operation of a load component arranged in an automatic processor.
When the operation signal is generated from the control means and the zero-crossing detection circuit detects the timing, the load component driving AC wave is supplied to the load component and / or the operation signal from the control means is stopped. And a load component drive circuit for an automatic processor, comprising: a plurality of solid state relays that stop the supply of the load component drive AC wave to the load component when the zero-crossing detection circuit detects the timing. 2. The control means is a microcomputer, and the pulse signal from the zero-crossing detection circuit is input to the microcomputer, as set forth in claim (1). Drive circuit for load parts of automatic processor. 3. The control means comprises a logic circuit for transmitting the actuation signal and a number of AND circuits corresponding to the number of the solid state relays, and the pulse signal and the actuation signal are input to the AND circuit, respectively. The load component drive circuit for an automatic processor according to claim (1), wherein the solid state relay is controlled by the output of the AND circuit.