DE69929541T2 - DEVICE AND METHOD FOR CONTROLLING DESTROYING - Google Patents

Description

technical area

The The present invention relates to a method and an apparatus for controlling the spraying of Wiping water in a printing machine by means of electrically controlled spray valves in a spray stick.

background the invention

As is known in the art, is a Sprühdämpfungsvorrichtung in the form of a spray stick, which is provided with electrically controlled spray valves, in a printing machine for spraying of mop water used on a rotating roller for conveying to a printing plate, See, for example, EP-A-0 325 381.

Of the spray ramp with its valves can be supplied from a source, where the control means for the valves can be supplied from another source and with the spray stick can be combined on the frame in a printing press. That means that certain important factors for the spray result may not be considered become.

It can for be more beneficial to the user, from a single source integrated spray process to buy, including the spray stick with its valves, with an internal feedback from for the spray result important parameters or properties is provided, so that the spraying completely regulated he follows.

The invention

The The present invention provides a method according to claim 1 and an apparatus according to claim 4. According to the invention For example, the supply of electrical pulses to the solenoid of each valve and the current profile from the solenoid to a valve-regulating one Computer to be returned, to provide an indication of the functionality of the valve. This feedback can be used for diagnosis, correction and / or alarm. It creates an important opportunity for preventive maintenance and can reduce the number of unwanted Minimize interruptions.

In addition, the physical properties of the wiping water, which has been supplied to the valves is, recorded and fed to a computer The single output leads to the valves and one communications receiver having an on / off information, so that an integrated spraying process is produced.

Usually are the temperature, the pressure and the flow rate of the Wischwassers detected, because of these properties for the spray result the biggest meaning have.

Brief description of the drawing

The invention will be described in more detail below with reference to the appended drawing, in which: 1 a general representation of a first embodiment of the invention on a spray stick, 2 that too 1 corresponds, a second embodiment of the invention, 3 a representation of a sensor portion to be used, and 4 a graphical representation of a current signal, a movement of a Sprühventilstößels, which has been induced by the current signal, and a Sprühdurchflußprofil, which has been generated by the movement.

Detailed description the embodiments

In the 1 and 2 is a spray stick 1 shown for a printing press. The construction and function of such a spray stick is well known in the art, and the spray stick will not be described in detail hereinbelow. In the spray stick 1 become spray valves 2 with a so-called mopping water through a pipe 3 supplied, and the spraying of the wiper water through the valves is monitored in each valve by a solenoid-controlled plunger.

Each electromagnet is electrically connected by a cable 4 actuated. The current for actuating the electromagnet can be like the line a) in 4 that is, as a square wave (slightly modified by trigger tips at the ends, not shown), with the pulses for opening the valve having a typical duration of 5 ms and the time period for the zero crossing of the current having a typical duration of 8 ms. The resulting movements of the valve stem can according to the line b) in 4 run, and the spray flow profile of the valves 2 can then as in line c) in 4 shown run. The normal spray flow profile is thus a series of spray pulses of a very short duration which provides the desired spray result on the roll of the printing press where the spray stick is mounted. Every valve 2 is individually controlled, as by the four lines 4 in 1 is indicated.

The single current signal through the line 4 will be in a computer 5 with a power supply 6 (for example, 24 V) and a communication receiver 7 with an on / off information for externally activating the computer controlled controller 5 generated.

The computer 5 has a sensorab cut 5 ' (also in 3 shown), in which sensors 8th . 9 . 10 for detecting a respective temperature, a pressure and a flow of the wiper water in the tube 3 are provided.

These values are stored internally in the microprocessor of the computer 5 are supplied as important control parameters to provide adequate spray flow profiles for the valves to perform the desired spraying (uniformity, distribution, amount, etc.) on the press roll.

Every computer 5 can in practice have eight output lines 4 have. Thus, two spray sticks 1 each with four valves 2 or a spray stick with eight valves.

As a modification of the in 1 illustrated embodiment, the sensor section 5 ' in the spray stick 1 be arranged. In this case, the sensors are 8th . 9 . 10 externally with the computer 5 connected.

In a second embodiment, see 2 , which is preferred when an integrated spray stick unit is desired, the entire computer can with its sensor section within the Sprühstockes 1 next to the valves 2 be arranged. Here extend the mop tube 3 , the power supply 6 and the communication receiver 7 in the spray stick 1 ,

An important feature of the computer 5 is the ability to provide feedback on the functioning of the plunger with respect to its solenoid in each valve in response to the supplied current profile. The current for the electromagnet can be measured, for example, via a resistor and to the computer 5 to be led back. If this measured profile deviates too much from a predetermined profile window, this can be interpreted as an indication of poor performance. The current profile can be used to diagnose the function of each valve so that timely action can be taken to prevent unwanted stops. Alternatively, individual corrections of the current may be made to restore the function of a valve. Furthermore, an alarm can be triggered at a current profile, which is outside predetermined limits. That is, the duty cycle for a valve can be analyzed.

Claims (8)

Method for controlling the spraying of mop water in a printing press by means of electrically controlled spray valves ( 2 ) in a spray stick ( 1 ), characterized in that physical properties of the valve (s) ( 2 ) and a computer ( 5 ), which individual output lines ( 4 ) to the valves and a communication receiver ( 7 ) with an on / off information, so that an integrated spray process is generated. Method according to claim 1, characterized in that that the Temperature, the pressure and the flow rate of the wiper water are detected. Method according to claim 1, characterized in that the current profile of the electromagnet of each valve ( 2 ) to the computer ( 5 ) is returned to provide an indication of the operability of the valve. Device for controlling the spraying of mop water in a printing press by means of electrically controlled spray valves ( 2 ) in a spray stick ( 1 ), characterized by a computer ( 5 ) with individual output lines ( 4 ) to the valves ( 2 ) and a communication receiver ( 7 ) with on / off information and by means ( 5 ' . 8th . 9 . 10 ) for detecting physical properties of the fountain solution supplied to the valves and supplying the detected physical characteristics to the computer. Apparatus according to claim 4, characterized in that the means comprises a sensor section ( 5 ' ), through which the wiper water is supplied and which with sensors ( 8th . 9 . 10 ) is provided for temperature, pressure and flow rate. Apparatus according to claim 5, characterized in that the sensor section ( 5 ' ) in connection with the computer ( 5 ) is arranged. Apparatus according to claim 5, characterized in that the sensor section ( 5 ' ) in the spray stick ( 1 ) is arranged. Apparatus according to claim 5, characterized in that both the computer ( 5 ) and the sensor section ( 5 ' ) in the spray stick ( 1 ) are arranged.