Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For press shaping surface
Patent
1996-08-30
1998-12-01
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For press shaping surface
425195, 425345, B30B 1502
Patent
active
058434887
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a device for fixing shaped dies, which are provided with mold cavities and are circular cylindrical on their outer circumference, in the die table of a tabletting press, especially a rotary tabletting press.
BACKGROUND OF THE INVENTION
Modern tabletting presses are suitable for pressing tablets of various types and shapes. The adjustment of the individual dies to the upper and lower punches is not necessary in the case of circularly symmetrical tablets. If a circularly symmetrical tablet is to have lettering on both sides or is to have predetermined breaking scores on both sides, the adjustment of the upper punches and lower punches in relation to one another is important. This has hitherto been done by means of guide sleeves provided with grooves for the upper punch and the lower punch. Adjustment of the die with circularly symmetrical hole to the punches is not necessary.
If the shape of the tablet is not circularly symmetrical, so-called shaped dies are needed, and the adjustment of the upper and lower punches to one another alone is not sufficient. Shaped dies are dies which are circularly cylindrical on the outer circumference and whose mold cavity is aligned asymmetrically rather than rotationally symmetrically to the axis of the die. To make it possible to prepare asymmetric tablets in mold cavities, the upper and lower punches must be adjusted to one another and to the mold cavity of the shaped die.
To fix shaped dies in the prior-art devices, an upper curve segment is removed in the curve path for the upper punch. The upper punch is then guided by the upper guide sleeve of the rotor of the tabletting press. The shaped die is subsequently pressed into the die hole of the die table by means of the upper punch. The upper punch and the shaped die are thus adjusted to one another. While the upper punch fixes the shaped die, the latter is fastened by means of the corresponding die holders. The upper punch is then again moved up and down for checking, and the die wall of the shaped die should not be touched. It is now checked whether the upper punch and the shaped die are still adjusted correctly to one another. The shaped die may thus be displaced tangentially with the die holders during the fastening. The entire fixation process must be repeated in this case. The situation is similar if the upper punch touches the shaped die for checking during the repeated lowering of the upper punch. The fixation of the shaped die in relation to the upper punches is tantamount to the fixation of the shaped die in relation to the lower punches, because these are aligned with the upper punches due to the respective guide sleeves and their grooves. This laborious and time-consuming fixation of the shaped dies in relation to the upper punches means machine downtimes. However, since modern tabletting presses represent a high investment value, short downtimes must be achieved.
SUMMARY AND OBJECTS OF THE INVENTION
The basic object of the present invention is to provide a device with which the shaped dies can be fixed in relation to the upper punches in a simple manner.
According to the invention, a device for fixing shaped dies is provided. The shaped dies are provided with nonrotationally symmetrical mold cavities and are circularly symmetrical on an outer circumference. The dies are fastened by means of die holders engaging annular T-slots in a die table of a tabletting press, particularly a rotary tabletting press. Each shaped die has at least one centering surface associated with the nonrotationally symmetrical mold cavity. One centering piece, engaging the centering surface, is detachably movably arranged on the die table for each of the shaped dies. By using shaped dies with centering surfaces associated with the mold cavity, the centering surfaces can be fixed with a centering piece in relation to the upper punches of the tabletting press in a simple manner, as a result of which the machine downtimes for replacing the shaped dies are greatly reduced. The
REFERENCES:
patent: 2989781 (1961-06-01), Frank
patent: 3318265 (1967-05-01), Winters et al.
patent: 3565016 (1971-02-01), Christie
patent: 5116214 (1992-05-01), Korsch et al.
patent: 5635223 (1997-06-01), Korsch et al.
Korsch Wolfgang
Sommerfeld Peter
Korsch Pressen GmbH
Mackey James P.
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