Plastic article or earthenware shaping or treating: apparatus – Plural sets each comprising a female mold and opposed... – Molds or press members traveling transversely to molding motion
Patent
1997-01-29
1998-06-09
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
Plural sets each comprising a female mold and opposed...
Molds or press members traveling transversely to molding motion
425353, 425DIG5, B30B 1108
Patent
active
057629781
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a compression machine for making tablets.
BACKGROUND ART
Known compression machines for making tablets consist of a turret, that is driven so that it rotates around its vertical axis, and that is fitted with a die hole or matrix plate located near its mid-height coaxially therewith.
The die holes made in this plate consist of holes with their axes regularly spaced apart along a circumference coaxial with the turret, and are parallel to the axis of the turret.
Each die hole has two related punches, upper and lower, guided by respective housings in the turret. The housings and the respective die hole are coaxial.
The working heads of each pair of punches faces each other and have such a diameter that they fit, from above and below, into the related die hole.
As it is known, production of a tablet by means of a compression machine involves, in sequence, loading a die hole with powder or granular material, volumetric determination of the amount of material put into the die hole to form the tablet, pre-compression of the tablet material and subsequent final compression of the same, with consequent forming of a tablet of a pre-established thickness. Finally the tablet thus formed is ejected from the die hole.
The steps just described are performed, in sequence, while each die hole travels along a predetermined arc of a round. Usually this arc extends along a full round made by the turret.
In particular, suitable driving means, connected with the punches and designed to impart guided axial stokes to the punches in their housings, work in correspondence with the filling, batching and ejecting stations.
A compressing machine for making tablets of the above described type is disclosed in the U.S. Pat. No. 4,943,227, owned by the same Applicant.
This machine comprises a cylindrical chamber, made in the turret and coaxial with the turret axis, set into communication with the die holes by means of infeed channels, which are made in the die hole plate and preferably arranged radially with respect to the axis of the turret.
The cylindrical chamber is filled with the material to be supplied to the die holes in order to make the tablets.
The die holes are loaded rapidly due to the centrifugal force resulting from rotation of the turret.
In practice, as soon as the working head of the upper punch uncovers the opening section of the infeed channel, the material is pushed inside the die hole.
The distance between the opposing working heads of the punches determines, in a loading stage, the die hole volume, i.e. the volumetric determination of the tablet being formed.
The punches are moved by driving means comprising fixed cam grooves, integral with the machine structure and designed to be engaged by rollers which are rotatably supported by the same punches on a radial axis.
In the known compressing machines for making tablets, it is difficult to change, according to the needs, the batch of material fed for making a single tablet.
It is necessary to act on the lower punch driving in order to change the distance between the working heads of the punches, and this operation requires the substitution of the whole group that drives the punches in the loading and batching steps after the ready tablets have been ejected.
Obviously, this results in high construction and operation costs as well as in a limited through-put.
An improved compression machine for making tablets is disclosed in the Italian Patent Application No. BO93A000493, owned by the same Applicant.
This machine includes punches that carry pairs of rotating rollers, fastened to the opposite ends of a cross pin, and engaging respective cam grooves made in the fixed structure of the machine.
The aforementioned rollers can fit into the cam grooves either at the level of the lower wall or at the level of the upper wall of the path defined by the cam groove.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a device that allows for a simple and quick adjustment operation of the batching means in compre
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patent: 4943227 (1990-07-01), Facchini
patent: 5350548 (1994-09-01), Hinzpeter et al.
I.M.A. - Industria Macchine Automatiche - S.p.A.
Mackey James P.
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