Textiles: fluid treating apparatus – Machines – Liquid flowing
Reexamination Certificate
1999-12-03
2001-07-10
Coe, Philip R. (Department: 1746)
Textiles: fluid treating apparatus
Machines
Liquid flowing
C068S175000, C068S903000
Reexamination Certificate
active
06257028
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a treatment device for a continuously moving web. The device has a machine frame and a container that is supported in the machine frame to hold a treatment fluid and has a drum that can rotate in the container in the treatment fluid. This drum has a cylindrical, fluid-permeable circumference, at the bottom of which the web rests against the region which is immersed in the container, at a looping angle of at least, and further has a driven eccentric shaft which is rotationally mounted in fixed external bearings. Also provided is a drum shaft that carries the drum, eccentrically mounted on the eccentric shaft, structured as a hollow shaft, and surrounding the eccentric shaft, which is rotationally mounted at its ends on regions of the eccentric shaft that are eccentric to the axis of rotation of the eccentric shaft.
Such a treatment device is described in German Patent 11 13 201. The rotating eccentric shaft has regions eccentric to its axis of rotation, on which the drum shaft is mounted by means of roller bearings. As the eccentric shaft rotates, the drum shaft and therefore the drum supported on it perform an eccentric movement. At the same time, the drum rotates, in which connection it can be entrained by the web, but also can itself be driven. The web surrounds the drum and is moved back and forth in the treatment fluid contained in the container, as the drum performs its eccentric movement, perpendicular to the plane of the fluid, thereby resulting in an increased bath exchange and an improved treatment effect, particularly washing effect.
Because of the eccentric movement of the drum, strong vibrations occur, which made a special foundation necessary for the known device. In addition, the parts of the device were subject to significant alternating stresses over an extended period of time, which placed special demands on the material.
SUMMARY OF THE INVENTION
The invention is based on the task of reducing the vibration related problems present in prior art devices of the type set forth above. The present invention improves on existing designs by providing that the drum shaft be suppported on the machine frame at both ends, an an elastically resilient manner, in a plane perpendicular to its axis.
In this way, the mounting of the drum shaft on the eccentric shaft can be relieved of part of the weight of the drum, and the drum shaft can be relieved of part of the mass forces. The mass forces of the drum and the drum shaft which are passed on to the eccentric shaft are passed on to the machine stand, in damped manner. This already achieves a significant improvement in the effects of vibrations.
In the preferred embodiment, the drum shaft is suspended on the machine stand in elastically resilient manner, i.e. the elastically resilient support is located above the drum shaft and is subject to tensile stress.
According to another important aspect of the invention, the hollow elements, namely the rods and the drum shaft, form buoyancy elements which can take over a significant part of the weight of the drum and the drum shaft when the drum is immersed in the treatment fluid in its operating state.
The hollow rods are actually known from German Patent 44 13 871 C1, but they deviate from the state of the art of the preamble with regard to the mounting of the drum and the production of the eccentric movement.
In another aspect of the invention, if the drum has an endless stretchably elastic pulling drive element, such as a belt or several parallel round belts, this pulling drive element can simultaneously serve as an elastic support which catches at least part of the weight of the drum and the drum shaft.
The drive is provided at only one end of the drum. At the other end, the elastic support can be formed such that the drum shaft carries a pivot bearing at that end, which is supported on the machine frame via by springs, particularly by tension springs.
Another aspect of the invention concerns the buoyancy volume and the stress on the stretchably elastic supports on the two ends of the drum shaft. The volume of the drum shaft and the rods which is immersed in the treatment fluid is sized in such a way that at the typical operational immersion depth, the buoyancy is 70 to 90% of the weight of the drum and the drum shaft), while the remaining weight is carried by the stretchably elastic pulling drive element at the one end and the springs at the other end of the drum shaft. Hence, a significant part of the weight of the drum and the drum shaft are therefore equalized by the buoyancy, while only a small part is to be caught by the stretchably elastic support.
To reduce the development of vibrations, equalization masses are provided at the eccentric shaft in the vicinity of the eccentric regions. (Such equalization masses on treatment devices of the type in question are known.)
A significant aspect of the present invention is the combination of the aforementioned characteristics, namely utilization of the buoyancy of the drum and the drum shaft, the elastically resilient support of the two ends of the drum shaft, and the equalization masses on the eccentric shaft. These characteristics, in combination, result in a device which gives off hardly any significant vibrations to the environment in operation, and in particular no longer requires a complicated, separate foundation.
REFERENCES:
patent: 2963893 (1960-12-01), Kusters
patent: 3700404 (1972-10-01), Janisch et al.
patent: 3774419 (1973-11-01), Appenzeller
patent: 5768919 (1998-06-01), Kurschatke
patent: 11 13 201 (1961-08-01), None
patent: 44 13 871 (1995-01-01), None
Coe Philip R.
Eduard Kusters Maschinenfabrik GmbH & Co. KG
Kenyon & Kenyon
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