DE2016291A1 - Formation of colour images - Google Patents

Abstract

A photo-electrophoretic process for producing a polychrome image comprises submitting a first image forming suspension layer to an electrical field applied between electrodes. One of the electrodes is partially transparent. The suspension consists of finely divided particles of an electrically photosensitive pigment, which is also of a primary colour, in a liquid medium. The exposure of this suspension to a selective negative of colour photography, with electromagnetic radiation traversing the transparent electrode, forms an image. A supplementary layer of a second similar suspension is similarly exposed, forming a second image which, combined with the first, produces a multicoloured image.

Description

Circuit for controlling work processes, especially in centrifuges The invention relates to a circuit for controlling work processes, in particular in centrifuges using timing relays, output relays and time setpoint potentiometers.

There have been controls for centrifuges, especially sugar centrifuges proposed in which the automatic sequence of operations by means of shift drums is controlled, whereby the Schaltwalsen read out timing relays at certain times so that the individual operations take place for a desired period of time. Further it is known that switching disks are lined up pivotably on a shaft, the when the shaft rotates according to a program in chronological order control holder actuate.

These controls have the disadvantage that by the roller drive motor large newspaper arrows occur. On the other hand, there is no revealing time change possible. The adjustability is in a very limited range. Another The disadvantage is that there is a dead time after each continuous program run necessary roll return to the zero point occurs.

Furthermore, a circuit for controlling centrifuges is known which from an electronic time relay, a rotary selector, output relay and potentiometers for the time specification for the individual program items.

These switching devices are designed in such a way that ait the help of the rotary selector a potentiometer is connected to the electronic time relay and thus the program time is determined, after which an output relay is switched. Is the first When the program point has elapsed, the rotary selector turns the next potentiometer into the electronic timing relay switched on after the previous time setting switched off became. After the specified time has elapsed, the following output relay switches. To The end of the last time step can be used to activate the entire program sequence using a repeat switch be repeated.

The disadvantage of this circuit is essentially its occurrence of malfunctions ii rotary selector and poor timing accuracy. This causes a high risk for the operating personnel, especially when due to failure of the rotary selector in the centrifuge lateral pole. would have to be initiated at a later date. aside from that the entire process implementation is called into question by the inaccuracy of time. Another disadvantage is that searching for and finding errors is due to the circuit structure is very complicated.

Furthermore, a circuit is known which consists of meohanlsoben timing elements and output relay exists. When the centrifuge is started up, the first timer is energized, after which the associated output relay is switched, this picks up the next timer, after which the next assigned timer relay is switched. After the last time stage has elapsed, a repeat stage the entire program be repeated.

The disadvantages of this circuit are essentially that the mechanical timers have a short lifespan and are resistant to contamination and high humidity are very prone to failure. The consequence of this is non-compliance of the program and the technology to be carried out with it. Another disadvantage This circuit is the large volume that an unacceptably high space requirement requires. Error detection is relatively complicated and time consuming.

The purpose of the invention is to provide a circuit for controlling work processes, especially in centrifuges that require considerably less space and is less prone to failure.

The invention is based on the object of a circuit for controlling of work processes, especially in the case of centrifuges, that are easy to use in Construction using components that are not mechanically moved a precise lateral Adherence to the individual program points and quick error detection and elimination enables.

According to the invention, the Auigabe is achieved in that one or two electronic time relays connected to time setpoint potentiometers in such a way that they can be interrupted are that only one time setpoint potentiometer at a selectable point in time is in contact with an electronic timing relay. flat expiration one at the respective Time setpoint potentiometer becomes an output relay connected to the first timing relay. After the command has been issued, the time setpoint potentlometer becomes separated from this electronic timing relay and the electronic timing relay switched off. Another tent setpoint potentiometer is now attached to the second electronic timing relay switched on and the second electronic time relay is switched on when the first command output is complete. All following time setpoint potentiometers and output relays of a relay chain formed therewith are connected analogously, wherein the relay chain is advantageously constructed with the aid of plug-in modules.

For the purpose of initiating one or more additional operations can during the duration of a previously initiated operation An analog timing relay chain with any output relay connected to the first timing relay chain. In these newly formed timing relay chains can turn one or more output relays each one newly formed Time relay chain can be switched on. This holding process can be continued at will will.

Another inventive feature is that relay contacts of the Output relay in the switching path from the timing relay to the output relay are that the output relays are energized in a consecutive switching sequence can be. Furthermore, the last output relay is a formed relay chain In each case an auxiliary relay is connected downstream via a sohaltdiode, its excitation coil is connected in parallel with a capacitor.

The advantage of the circuit according to the invention is that it is a has high operational reliability and a longer service life than the known circuits, since apart from the output relay no mechanically moving components are used. A Another advantage is that due to the special structure of the invention Circuit and, through the use of plug-in modules, a quick and simplified one Troubleshooting can be carried out. There is also the advantage in the extremely small construction volume with minimal economic effort compared to the known circuits. Maintaining a high level of time accuracy is another advantage consider.

The operation of the circuit according to the invention is as follows explained in more detail using an exemplary embodiment shown in the drawing.

A time relay is activated by a start command at a start contact bi d01 switched on with a setpoint adjusted on a time setpoint potentiometer ri.

After this set time has elapsed, the time relay dOl switches an output relay di an as this sets the time setpoint potentiometer ri and the Time relay dOd out of order. At the same time there is a time relay dO2 and a time setpoint potentiometer r2 released for excitation. A start command that now follows on a start contact b2 or the output relay dl switches on the timing relay d02 and the time setpoint potentiometer r2 to the time relay dO2. After the time set point potentiometer r2 on Timer relay d02 switches the timer relay d02 to an output relay d2 a.

This separates the time setpoint potentiometer r2 from the time relay dO2 and the time relay dO2 switched off.

The one that is out of order during the runtime of the time relay dO2 Time relay dOl is now released for the next pickup by output relay d2. Then the timing relay is activated by a switching contact b3 or by the output relay d2 d01 switched on again and a time setpoint potentiometer r3 to the time relay d01 switched on. After the set time on the tent setpoint potentiometer r9 an output relay d3 is switched on, which the time relay d01 and the time set potentiometer r3 out of service. Repeat the switching operations described above each with freely selectable setpoints on the respective time setpoint potentiometer r1 to rn up to an output relay dn, the output relays dl to dn-1 until the program is completed, i.e. until the output relay is activated hold dn. At the same time, an auxiliary relay dx is switched on by the output relay dn, wherein the excitation coil of the auxiliary relay dx with a capacitor c for drop-out delay of the auxiliary relay dx is connected in parallel. The now effective dropout delay on Auxiliary relay dx leads to a safe shutdown of the built-up, described above Timing relay chain.

To interlock the output relays dft to dn with each other and for Fuse or on delay of the auxiliary relay dx are switching diodes n is nn; nx provided. Furthermore, relay contacts df to dn of output relays d1 to d @ so are in the control path from the timing relay d01; d02 switched after the output relays d1 to d @, that the Output relay dl to dn in d @ order of operations dl; d2; d3 to dn can be excited.

Due to the circuit according to the invention, it is possible to use any Output relays d1 to dn further parallel running analog timing relay chains to turn on.

In the application of the circuit according to the invention, in particular at Zontrifugen it is possible to make the necessary electrical and teohnologisohen To control work processes in ire selectable times and desired sequence.

Claims (4)

Claims Circuit for controlling work processes, especially in centrifuges using timing relays, output relays and time setpoint potentiometer, thereby characterized that one or two electronic time relays (d01; d025 with Time setpoint potentiometers (r1 to rn) are connected interruptible that each only one. Time setpoint potentiometer (r1 to rn) at a selectable point in time is in contact with a time relay (dOl or d02) and after a time has elapsed on the respective Time setpoint potentiometer (r1 to rn) set time an output relay (d1 to dn) the timing relay (d01) is switched on, after its command the relevant Time setpoint potentiometer (r1 to rn) separated from the electronic time relay (d01), the electronic time relay (d01) is switched off and another time setpoint potentiometer Cr1 to rn) the electronic timing relay (d02) is switched on, the electronic Time relay (d02) switched on and all subsequent time setpoint potentiometers (r1 to rn) and output relays Cdi to dn) analogous to a relay chain formed therewith are switched. 2. A circuit according to claim 1 characterized in that for the purpose the initiation of one or more additional work steps during the implementation of a previously initiated operation one or more analogous to the first Timing relay chain built-in timing relay chains each with any output relay (d1 to dn) of the first timing relay chain are connected and further timing relay chains in turn, one output relay each (d1 to dn) of the newly formed Time relay chains are switched on, this switching process being repeatable as required is. 3. Circuit according to claim 1 and 2 thereby gekennseicbnet, dnß relay contacts (d1 to dn) so in the switching path from the timing relays (d01; d02) to the output relays (d1 to dn) are connected that the output relays Cdl to dn) in the sequence dl; ; d1; d3 to dn are excitable. 4. A circuit according to claim 1 to 3, characterized in that the Output relay (dn) An auxiliary relay (dx) is connected downstream via a switching diode (nx) whose excitation coil is connected in parallel with a capacitor (c).