Fluent material handling – with receiver or receiver coacting mea – With conveying means to supply successive receivers – With lateral motion of registering head and receiver
Reexamination Certificate
2000-04-03
2001-09-04
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
With conveying means to supply successive receivers
With lateral motion of registering head and receiver
C141S067000
Reexamination Certificate
active
06283176
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a device for metering and dispensing powdered filling material into containers of the type known from DE 33 28 820 C2. The known device has a metal filling wheel for the powder. The manufacturing costs of a filling wheel of this kind are very high due to the large number of recesses that are required as weight saving measures and due to the desired precision of the bores for the metering pistons. Furthermore, the abrasion resistance of such a filling wheel and its ability to be cleaned or sterilized are critical when it is used in the pharmaceutical field. With the known device, it is also necessary to manually adjust each metering piston individually in its radial position if a different metering quantity is desired. Such an adjustment therefore requires a relatively large amount of time and requires trained personnel.
OBJECTS AND ADVANTAGES OF THE INVENTION
The device according to the invention for metering and dispensing powdered filling material into containers, has the advantage over the prior art that its filling wheel is relatively easy to manufacture, is easy to manipulate due to its light weight, and fulfills high demands with regard to the wear resistance and the ability to be cleaned or sterilized.
Other advantageous embodiments of the device according to the invention are defined in the claims. A particularly compact design and a high-performance of the device can be achieved if a number of filling wheels are disposed one after the other in terms of the feed direction of the containers. In this instance, a reduced number of metering pistons is disposed in each filling wheel in comparison to the use of a single filling wheel so that due to the larger angular intervals between the individual metering pistons, a reduced filling wheel diameter is permitted. If the filling material quantity is also reduced to half the amount when two filling wheels are used, then the filling wheel diameter can be additionally reduced due to the lower metering chamber volume.
A central and synchronous adjustment of the metering volume of the metering pistons can be achieved by means of an adjusting disk which cooperates with all of the metering pistons of a filling wheel simultaneously. In order to permit an automatic adjustment of the metering volume without additional manual interventions or adjustments on the filling wheel, in a preferred embodiment, the provision is made that the adjusting device and the filling wheel are coupled by means of a respective servo drive mechanism. It is therefore possible to operate the two servo drive mechanisms synchronously during normal operation and to drive the two servomotors asynchronously for a short time in order to adjust the metering pistons.
REFERENCES:
patent: 4671430 (1987-06-01), Dinius
patent: 4949766 (1990-08-01), Coatsworth
Kettenbach Bruno
Widmaier Juergen
Wurst Reiner
Douglas Steven O.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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