Valve, in particular glue valve

Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating

Reexamination Certificate

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Details

C239S075000, C239S584000, C251S129060, C251S129150

Reexamination Certificate

active

06170766

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a valve, in particular a glue valve, having an actuator made from magnetostrictive material for actuating a closure member at high-frequency, and having a magnetic field generator, in particular a field coil, assigned to the actuator.
Valves having a magnetostrictive actuator are advantageous chiefly when high-frequency opening and closing movements of the valve are required. An advantageous field of application is a glue valve for applying punctiform glue patterns to packages or blanks for packages. In the production of cigarette packets, above all, there is a need for high-frequency opening and closing movements of a glue valve, because of the high output of the packaging machines.
SUMMARY OF THE INVENTION
The valves so far known, which have a magnetically operable actuator, are problematic with regard to a precise response of the actuator, specifically effective expansion and contraction.
It is therefore the object of the invention to improve valves, in particular glue valves, with regard to the accuracy of the changes in length of the actuator.
To achieve this object, the inventive valve is characterized in that the actuator is connected to a holder which can be moved with high inertia, in particular in the case of thermal change in the actuator.
During the operation of a valve, in particular of a glue valve, thermal fluctuations occurring can impair the positioning accuracy of a conventional actuator.
The temperature fluctuations cause an additional change in length of the actuator which leads to superimposition with the changes in length produced by the magnetic field. In the case of the inventive valve, the influence of the change in length due to heat is eliminated in such a way that this slow change in length produces no effects on the short-term, high-frequency control movements of the actuator.
The actuator is advantageously connected to a movable inertial body which preferably consists of metal and has a high mass. Movements of the inertial body are produced in accordance with the changes in length of the actuator because of thermal influences. The opening and closing movements of the valve are not influenced thereby. The inertial body can advantageously be displaced against elastic pressure, in particular against compression springs.
Another particularity of the invention is the actuation of the actuator by an electrically generated magnetic field. The latter effects a lengthening of the actuator, and thus a movement of the same into the closed position of the valve. In order not to need continuously to energize the field coil in this extended position of the actuator, according to the invention the actuator is assigned a permanent magnet, in particular a tubular permanent magnet, which concentrically surrounds the actuator. Its effect is that the actuator is moved into the closed position when the coil is de-energized, and into the open position when the coil is energized.


REFERENCES:
patent: 4809885 (1989-03-01), Hayashi et al.
patent: 5697554 (1997-12-01), Auwaerter et al.
patent: 5868375 (1999-02-01), Reinicke et al.
patent: 5915361 (1999-06-01), Heinz et al.
patent: 40 20 164 (1992-01-01), None
patent: 43 25 143 (1994-12-01), None
patent: 195 00 706 (1996-07-01), None
Daniel J. Jendritza, Hartmut Janocha: Smarte Aktoren mit piezoelectriktrischen und magnetostriktiven Festkorperenergiewandlern. In: F & M 102 (1994) 11-12, S.592.
Patent Abstracts of Japan, vol. 199, No. 602, Feb. 29, 1996; & JP 07 259690 A (Unisia Jecs Corp), Oct. 9, 1995.

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