Tool-holder for a tablet making machine

Details Tool-holder for a tablet making machine Tool-holder for a tablet making machine

1997-04-23

1999-03-16

Ryan, Patrick

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

Including support or guide means for disassembled element

425193, 425345, 425353, B30B 1108

Patent

active

058826963

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a tablet making machine.


BACKGROUND ART

Currently, tablet making machines are known in which material to be compressed in powder or granular form, is supplied to the inner room of each matrix of a matrix assembly that is fixed peripherally to a rotary turret.
Each die matrix is entered, on opposing faces, by a pair of stamping heads which are secured to respective punches.
The punches of each pair of stamping heads are guided by respective coaxial holes made along the periphery of the rotary turret.
The punches are activated axially by suitable driving means, including e.g. cam means, which control the position of the punches upon rotation of the turret for each working cycle.
In particular, the Italian Patent Application No. 3514A/90, owned by the Applicant, describes a machine of the type as mentioned, in which there are means for coupling the stamping heads with the respective punches, and means provided in the punches for locking the coupling means.
The stamping heads are secured to, or released from, the punches by tightening or releasing the locking means.
The above mentioned locking means include a screw member that passes through a transverse hole made in the respective punch and that engages wedging means made in form of a wedge that enters an indentation made in the stamping head.
The compressing device has achieved good results, and in particular allows for quick and easy change over of the heads, so that tablets with different sizes can be produced.
However, the rigid locking of the coupling means with respect to the punches may bring about damaging stress.
For example, the coupling means may be displaced while engaging the stamping heads, and the displacement would also concern the locking means.


DISCLOSURE OF THE INVENTION

The object of the present invention is to provide an improved compressing device for a tablet making machine, that allows for a very good coupling between the punches and the stamping heads, while preventing possible damaging stress.
The above mentioned object is obtained by means of an improved stamping device for a tablet making machine, including a matrix plate formed around a rotary turret, at least a pair of coaxial punches which are guided for axial motion by respective holes made in the turret, at least a pair of stamping heads adapted to be respectively coupled with said punches in axial alignment therewith, so as to enter and exit a respective matrix of said matrix plate due to vertical motion of the respective punches, coupling means for securing each stamping head to a respective punch, and locking means for each punch in lock said coupling means to a position in which the respective stamping head is joined to the respective punch.
Each locking means includes a screw member that passes through a transverse hole made in said punch, the screw member having a head having a concentric semi-spherical section that matches a complementary recess connected to the outer surface of the respective punch.


BRIEF DESCRIPTION OF THE DRAWINGS

The characteristic features of the present invention are pointed out in the following with reference to the enclosed drawings, in which:
FIG. 1 shows a vertical sectional view of the compressing device, in which only one compressing head is illustrated;
FIG. 2 shows a corresponding sectional view of the device when the stamping head is removed from the punch.


BEST MODE OF CARRYING OUT THE INVENTION

With reference to the above mentioned figures, reference numeral 1 indicates an upper stamping head of the improved compressing device.
The stamping head 1 is moved, in a known manner, to enter a respective matrix carried by a table 2 formed in a periphery extension of a rotary turret 3 of the tablet making machine.
In fact, the table 2 of the rotary turret 3 carries a plurality of matrices which are regularly spaced apart along its periphery.
Each matrix delimits a room that is engaged, at both opposing faces, by a pair of coaxial stamping heads 1, i.e. an upper head and a lower head.

REFERENCES:
patent: 3507009 (1970-04-01), Comly
patent: 4475880 (1984-10-01), Crossley et al.
patent: 5022256 (1991-06-01), van der Meulen
patent: 5071607 (1991-12-01), Ayer et al.
patent: 5462427 (1995-10-01), Kramer

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