Pressure roller unit

Details Pressure roller unit Pressure roller unit

1998-01-21

2001-02-13

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For press shaping surface

C425S345000

Reexamination Certificate

active

06186762

ABSTRACT:

FIELD OF THE INVENTION
The present invention pertains to a pressure roller unit for rotary presses, especially for preparing tablets, with a frame lockable at the rotary press and with two bearing blocks which are adjustable at the frame and carry the pressure rollers.
BACKGROUND OF THE INVENTION
Such pressure roller units are used in rotary presses which comprise a frame, a rotor with drive, upper and lower rockers, which guide upper and lower pressure rollers, a frame housing, corner connections, and a cover plate. The forces occurring during the pressing process are directly introduced into the cover plate and the frame via the punches and the rockers and induce vibrations in these membrane-like components due to the pressing forces. These vibrations lead to considerable noise emissions.
A pressure roller unit of this type has been known from U.S. Pat. No. 3,891,375. In this pressure roller unit, the frame comprises upper and lower crossbeams, which are connected by vertical braces, and two columns arranged between these, on which the bearing blocks of the pressure rollers are slidable. The frame is mounted pivotably around a vertical axis in the press frame and forms a part of the press housing in the closed position. The frame may be pivoted by about 90° from a working position into the open position, in which case the drive of the pressure rollers is uncoupled and the pressure rollers are disengaged from the upper and lower punches. The bearing block for the upper pressure roller is connected to the upper crossbeam by means of an adjustable spacer. The spacer is used to set the depth of penetration of the upper punches into the dies of the die disk. The bearing block for the lower pressure roller is connected via a shaft to a hydraulic adjusting unit, which acts on the lower pressure roller for the purpose of setting the tablet thickness. The drawback is that the pressing force passes over the press frame and that the mounting of the bearing blocks for the pressure rollers at the two vertical columns and at the frame pivotable in the press frame is soft and elastic, so that the prior-art pressure roller unit can be used for weak pressing forces only.
SUMMARY AND OBJECTS OF THE INVENTION
The basic object of the present invention is therefore to improve the pressure roller unit of this type.
To accomplish this object, the present invention provides for the frame formed from a guide column and bearing blocks arranged at jointly adjustable upper and lower pressure roller mounts guided by the guide column. As a result, a pressure roller unit which can be used to absorb strong pressing forces is created, whose guide column can be designed as an extremely stable guide column, and the pressing force is prevented from passing over the press frame. Furthermore, the upper and lower pressure roller mounts may be adjusted not only independently from one another, but also together, in order to thus make possible the adjustment of the pressing zone in the case of the parallel adjustment of both pressure roller mounts at a fixed distance from another, or the adjustment of the web height for setting the tablet thickness in the case of the setting of the lower pressure roller mount in relation to the upper pressure roller mount.
In the preferred embodiment, the guide column and the pressure roller mounts have a cylindrical design and the pressure roller mounts are mounted in the guide column. Thus, this forms the housing of the pressure roller unit at the same time.
In another embodiment of the present invention, the upper pressure roller mount is provided with an upper adjusting drive acting on the guide column, and the lower pressure roller mount is provided with a lower adjusting drive, which is mounted in the upper pressure roller mount and acts on same.
Furthermore, the guide column is mounted vertically upright on a frame plate of the rotary press and can be set and locked by means of an adjusting drive. This design and arrangement of the pressure roller unit is possible, because the pressing forces of both pressure rollers are absorbed exclusively by the guide column, and this guide column can thus be arranged freely on a component standing on a massive, rigid and twisting-resistant frame plate of the rotary press.
The various features of the novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.


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patent: 5229044 (1993-07-01), Shimada et al.
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patent: 165401 (1904-09-01), None
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patent: 0 460 295 A1 (1991-12-01), None
patent: 2 252 917 (1975-06-01), None

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