US3566806A - Rotary tabletting machines - Google Patents

Rotary tabletting machines Download PDF

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Publication number
US3566806A
US3566806A US844525A US3566806DA US3566806A US 3566806 A US3566806 A US 3566806A US 844525 A US844525 A US 844525A US 3566806D A US3566806D A US 3566806DA US 3566806 A US3566806 A US 3566806A
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United States
Prior art keywords
die
machine
dies
tabletting
die table
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Expired - Lifetime
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US844525A
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English (en)
Inventor
Eric Forster
Ernest Frederick Sumner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manesty Machines Ltd
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Manesty Machines Ltd
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Publication date
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Publication of US3566806A publication Critical patent/US3566806A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0023—Drive arrangements for movable carriers, e.g. turntables

Definitions

  • This invention concerns rotary tabletting machines of the type (hereinafter referred to as of the type-described comprising a turret rotatable about a vertical axis and shaped to provide a horizontal circular die table having a plurality of dies arranged in a circle therearound with a lower punch projecting upwards into each said die from below, and to provide a flange about the die table in which flange are slidably located upper punches aligned with respective ones of the dies, the punches being adapted, upon rotation of the turret, to move relative the dies to compress particulate, granular or like material therein into tablets, and then to eject the tablets.
  • the material to be tabletted is usually supplied to the dies by means of one or more stationary filling shoes which rest on the die table and under which the successive dies pass upon rotation of the turret, openings being provided in the bottom of the or each shoe for the material to fall through into the dies.
  • the present invention provides a rotary tabletting machine, of the type described, characterized in that the annular space occurring between the die table and the flange thereabove is enclosedas .
  • the said annular space is enclosed by a circular wall provided at top and bottom with resiliently-loaded sealing strips engaging with the upper surface of the table and the under surface of the flange.
  • the circular wall is conveniently composed of arcuate sections.
  • the machine is a two-station machine wherein each die has a tablet formed therein during each successive half-revolution of the table, and each section of the wall is approximately semicircular and mounted upon a respective stationary part of the machine by a respective mounting.
  • Each such mounting is preferably adjacent a respective die filling sector of the table, and is conveniently in the form of a hollow feed block whereby material for tabletting can be introduced into the feed chamber in the regions of the filling sectors.
  • the arrangement of the invention preferably also includes, above the table at the or each filling sector, a downwardly inclined deflector the function of which is to tend to deflect tabletting material into the dies as the latter pass through the filling sector.
  • FIG. l is a cross-sectional elevation of the entire machine
  • FIG. 2 is an enlarged fragmentary detail of part of the machine of PEG. 1',
  • FIG. 3 is a fragmentary sectional plan corresponding to FIG. 2, the position of the section having been indicated by the lines IIIIII in FIGS. I and 2;
  • FIG. 4 is a fragmentary section, as indicated by the line IV-IV of FIG. 3, to a more enlarged scale, showing further details of the machine;
  • FIG. 5 is a detached elevation showing part of FIG. 4 when viewed as indicated by the arrow V.
  • the illustrated machine in general overall constructions, resembles known two-station rotary tabletting machines in that it comprises a supporting framework 10 wherein is journaled a vertical turret shaft 11 on which a turret 112 is secured, an appropriate drive motor 13 being provided for driving the turret 12, by way of a drive belt 14, pulley l5, worm shaft 16, worm wheel 17, drive shaft 18 and drive pinion 19 which meshes with a gear ring 20 set into an annular recess in the underside of the turret 12, and thereby rotating the turret 12 about a vertical axis.
  • the turret I2 is shaped to provide a substantially horizontal circular die table 21 having an array of die holes 22 vertically therethrough, these die holes 22 being arranged on a circle around the rotational axis of the turret 12 (see FIG. 3) and each accommodating a respective tabletting die 23 which is in the form of a hard metal sleeve of short axial length.
  • a respective lower punch 24 projects upwards from below the die table 21 into each of the dies 23, such punches 24 being accommodated for vertical sliding movement in respective holes in an annular skirt 25 of the turret 12.
  • the turret i2 is also shaped to provide, above the die table 2i, a flange 26 which overhangs the circle of dies 23 and has therethrough upper punch holes each of which accommodates a respective upper punch 27 which is axially aligned with a respective one of the dies 23.
  • Cam tracks 28 and 29 are provided for engagement by enlargements or protrusions 30 and 31 on the lower ends of the lower punches 24 and on the upper ends of the upper punches 27, for causing axial up and down movement thereof and effecting the necessary punch movements associated with tabletting operations and at each of two diametrically opposed positions (which correspond to two tabletting stations of the machine) there are upper and lower pressure rolls 32,33 between which the corresponding pairs of punches 27 and 24 pass so that endwise pressure is applied to the successive pairs of punches 27,24 to apply tabletting pressure to tabletting material in the corresponding die 23.
  • the parts as so far described are comparable with prior known machines.
  • the machine of the invention differs from the known machines, however, in the means provided for supplying tabletting material to the dies 23.
  • this gap or space 34 is employed as a tabletting material feed chamber, and this is achieved by enclosing the space concerned, making provision for feeding tabletting material thereto, and making provision for ensuring that at least part of any material in such space 34, upon rotation of the die table 21, is constrained to move over the dies 23 for filling the latter.
  • the wall section 35 comprises two side-byside metal strips 36 and 37 of width just less than the vertical spacing between the die table 21 and the flange 26, which strips are curved to approximately semicircular form so that each resembles one-half of a cylinder of short axial length.
  • the radii of curvature of the strips are somewhat less than the radius of the circle in which the dies 23 are arranged around the die table 21.
  • the two side-by-side strips 36 and 37 are rigidly secured to one another, at appropriate intervals, by rivets 38 with the result that the wall section 35 may be regarded as being l-I- shaped in cross section, providing narrow upper and lower channels each of which accommodates a respective nylon scraper blade 41,42.
  • a sinuous spring 43 accommodated between the strips 36,37 and abutting against the confronting edges of the blades 41 and 42, serves to load such blades 41,42 so as to protrude from their respective channels in the wall section 35.
  • the blades 41,42 may be composed of a plurality of sections.
  • the wall section 35 is secured, by way of the strip 36, to a curved open side 44 of a saddle-shaped hollow feed block 45 the general shape of which can best be seen from FIG. 3.
  • This feed block 45 is flat on its underside for mounting on a mounting plate 46 in turn mounted upon a respective appropriate support column 47 provided on the frame of the machine and to project a short distance over the die table 21, as can be seen from FIGS. 1 and 3, so that the curved side 44 of the feed block 45 follows, but just lies inside the path of movement of the dies 23 therepast.
  • the feed block 45 is hollow; it has an inlet connection 48 joining with its top and an outlet opening 49 in its bottom, such outlet opening 49 being generally of arcuate form and overlying a number of the dies 23 in the die table 21 as can be seen in FIG. 3.
  • the lower scraper blade 42 and the lower parts of the strips 36,37 are relieved or gapped in register with the outlet opening 49, as indicated at 50 in FIG. 1, to permit material to flow from the interior of the feed block 45, through the open side 44 thereof and the gap 50, into the annular gap 34 which forms the feed chamber of the machine.
  • an inclined deflector plate 52 Secured within the feed block 45, by screws 51 is an inclined deflector plate 52 which projects through the gap 50 into the feed chamber 34 and is formed therein with a lead-in tongue 53, the edge 56 of such plate 52 remote from the tongue 53 being close to the upper surface of the die table 21.
  • the two wall sections 35 are appropriately mounted by their feed blocks 45 being secured on their mounting plate 46, which are at diametrically opposed positions, relative to the turret 12, so that the feed blocks 45 are in advance of their corresponding pressure roll pairs 32,33, and the upper and lower edges of the wall sections 35 seal respectively with the lower surface of the flange 26 and the upper surface of the die table 21 by their scraper blades 41,42.
  • Each of the wall sections 35, together with its feed block 45, extends around one-half of the turret 12.
  • a finished tablet deflector 54- is provided on one side of each feed block 45, and these are associated with respective tablet takeoff chutes 55 the positions of which are indicated diagrammatically in FIG, 1.
  • Each feed block 45 has a funnellike hopper 56a secured to its inlet connection 48 and material (not shown) to be tabletted is supplied to the feed chamber 34 between the flange 26 and the die table 21 by being filled into the hopper 56a to fall into the interior of the feed block 45 and pass through the curved open side 44 thereof. Material present in the block 45 can also rest on the die table 21 by way of the outlet opening 49.
  • the upper punch 27 is raised clear of the die 23 and the lower punch 24 is raised to a position wherein its top face is just flush with the top surface of the die table 21, this position of the lower punch 24 being necessary for the removal of a previously formed tablet.
  • the die 23 moves towards a first die filling sector of the table 21, which sector corresponds to the outlet opening 49 in a first one of the feed I blocks 45 and during this movement the upper punch 27 is retained in its raised disposition, whilst the lower punch 24 effects slight downward movement.
  • the die 23 moves beneath the deflector plate 52 thereof and with continued movement the deflector plate 52 and the tongue 53 thereof deflect tabletting material carried on the die table 21 firstly radially outwards of the die table 21 the path of the die 23 and then down into the die 23, at the same time as the lower punch 24 is moved downwards to encourage the die 23 to fill.
  • the die 23 accordingly passes the lower edge 56 of the deflector plate 52 at least partially filled with tabletting material, and now moves past the bottom of the inlet connection 48 where the latter connects with the feed block 45.
  • the lower punch 24 With continued movement of the die 23, and whilst still in the region of the feed block 45, the lower punch 24 now moves upwards slightly to reduce the filled volume of the die 23, thereby effecting so-called weight-adjustment by ejecting upwards out of the die 23 any tabletting material exceeding a predetermined amount.
  • the die 23 now passes towards the respective end of the first feed block 45 adjacent which scrapers 57 and 58 project inwardly over the die table 21 to sweep inwards of the die table 21 any (jected or other tabletting material overlying the die 23 or disposed between the die 23 and the outer edge ofthe die table 21.
  • the die 23 then passes under a tail plate 59 which projects from the respective end of the feed block 45, and the upper punch 27 commences moving downwards.
  • the upper punch enters the die 23 from above and slight initial pressure is applied to the tabletting material from above and below, by way of the two punches 24,27 under the influence of their cam tracks 28,29.
  • the two punches 24,27 With continued rotation of the turret 12, the two punches 24,27 now move between the pressure rolls 33,32 whereat considerable endwise pressure is applied to the punches 24,27 to tend to move them towards each other and compress the material in the die 23 into a coherent tablet 60 (FIG. 4).
  • the upper punch 27 is raised by continued movement of the turret 12, until it is back at the position occupied at the beginning of the cycle and the lower punch 24 is similarly raised to bring the tablet 60 to an ejection position as shown in FIG. 4 wherein its lowermost surface is flush with or just above the upper surface of the die table 21.
  • the die 23 and tablet 60 are now moving towards the feed block 45 of the second station of the machine, the table 2t having performed half a revolution, for the commencement of a second tabletting cycle which is identical with that just described during the second half of the complete revolution of the turret.
  • the die 23 approaches the second feed block 4-5 'deflector plate 52 of the second feed block 45 at the commencement of the second tabletting cycle.
  • the arrangement of the invention provides for substantially all, or at least a large proportion, of the tabletting material present in the feed chamber 34 and available for filling the dies 23 to be constrained to move with the die table 21 as compared with the known stationary feed arrangements wherein the tabletting material is effectively initially stationary relative to the die table and has to catch up with the speed of rotation of the die table at the same time as falling into the dies, for filling the latter.
  • radial vanes or the like may be provided in the feed chamber (e.g. projecting outwardly from a ring surrounding the hub or center of the turret) to ensure that the tabletting material is positively caused to follow the rotation of the die table rather than reliance being placed upon the fric- 1.
  • a rotary tabletting machine comprising a turret rotatable about a vertical axis shaped to provide-a horizontal circular die table above which is a flange, said flange and said die' table defining between them an annular space around said turret, a plurality of dies arranged in a circle around said horizontal die with each of said dies, wall means enclosing said annular space as a material feed chamber for occupation by material to be tabletted, whereby said material will move with said die table upon rotation of said turret, deflector means in said material feed chamber to cause at least some of tabletting material therein to follow a path over the dies in said die table, in the region of a die filling sector of said table, actuating means constraining said upper and lower punches to move relative to said dies so as to cause each said upper punch to be raised clear.
  • each said lower punch to be lowered as its said die moves in said filling sector for tabletting material to fill into said die, to bring said upper punch down into its said die upon the latter moving out of said filling sector, to apply endwise pressure to said upper and lower punches to compress said material in said die to form a tablet, to raise said upper punch and said lower punch to eject said tablet from said die.
  • said wall means comprises a circular wall provided at top and bottom with resiliently loaded sealing strips engaging respectively with the upper surface of said die table and the lower surface of said flange.
  • a machine asset forth in claim 3 which is a two-station machine wherein each said die has a tablet formed therein during each successive half-revolution of said die table, characterized in that each said arcuate wall section is semicircular.
  • a machine as set forth in claim 4 further including, for each said wall section, a mounting located at the respective said filling sector,
  • each said mounting comprises a hollow feed block, supply means, whereby tabletting material may be supplied to said feed block, being connected to said feed block.
  • a machine as claimed in claim 6 further including, con nected to said feed block, a downwardly-inclined deflector disposed to deflect material, in said feed block downwards table, a lower punch projecting upwards into each of said dies, into said dies as P through Said filling Sectoran upper punch slidably located in said flange in alignment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Basic Packing Technique (AREA)
US844525A 1968-07-25 1969-07-24 Rotary tabletting machines Expired - Lifetime US3566806A (en)

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GB3550568 1968-07-25

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704976A (en) * 1970-04-15 1972-12-05 Ross Petersen Tablet press
US4403935A (en) * 1980-03-27 1983-09-13 Manesty Machines Limited Tabletting machines
US4988275A (en) * 1987-04-27 1991-01-29 Firma Wilhelm Fette Gmbh Rotary pelletizing machine
US5213818A (en) * 1990-05-21 1993-05-25 I.M.A. Industria Machine Automatiche S.P.A. Device for taking and conveying tablets coming out of a rotary tabletting machine
US5395227A (en) * 1993-08-20 1995-03-07 Westinghouse Electric Corporation Adjustable powder flow gate for a rotary pellet press
EP0743169A2 (de) * 1995-05-18 1996-11-20 BWI plc Rundlauf-Tablettierpresse
EP0823324A1 (de) * 1996-08-09 1998-02-11 Courtoy Rundlauf-Tablettierpresse
US6116889A (en) * 1997-01-31 2000-09-12 Korsch Pressen Gmbh Rotary press
EP1627727A3 (de) * 2004-08-19 2007-01-03 Fette GmbH Rundläufertablettenpresse
US20100136180A1 (en) * 2007-02-01 2010-06-03 Nestec S.A. Method and apparatus for making centre-filled shaped food products
US20100285166A1 (en) * 2009-05-11 2010-11-11 Fette Gmbh Rotary press

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1289570A (en) * 1914-11-30 1918-12-31 Francis J Stokes Rotary tablet-machine.
US3029470A (en) * 1959-07-13 1962-04-17 Stokes F J Corp Tablet making machine
US3460487A (en) * 1967-09-22 1969-08-12 Sterling Drug Inc Tablet forming machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1289570A (en) * 1914-11-30 1918-12-31 Francis J Stokes Rotary tablet-machine.
US3029470A (en) * 1959-07-13 1962-04-17 Stokes F J Corp Tablet making machine
US3460487A (en) * 1967-09-22 1969-08-12 Sterling Drug Inc Tablet forming machines

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704976A (en) * 1970-04-15 1972-12-05 Ross Petersen Tablet press
US4403935A (en) * 1980-03-27 1983-09-13 Manesty Machines Limited Tabletting machines
US4475880A (en) * 1980-03-27 1984-10-09 Manesty Machines Limited Tabletting machines
US4988275A (en) * 1987-04-27 1991-01-29 Firma Wilhelm Fette Gmbh Rotary pelletizing machine
US5213818A (en) * 1990-05-21 1993-05-25 I.M.A. Industria Machine Automatiche S.P.A. Device for taking and conveying tablets coming out of a rotary tabletting machine
US5395227A (en) * 1993-08-20 1995-03-07 Westinghouse Electric Corporation Adjustable powder flow gate for a rotary pellet press
US6068465A (en) * 1995-05-18 2000-05-30 Bwi Plc Rotary tabletting press
EP0743169A2 (de) * 1995-05-18 1996-11-20 BWI plc Rundlauf-Tablettierpresse
EP0743169A3 (de) * 1995-05-18 1997-09-24 Bwi Plc Rundlauf-Tablettierpresse
EP0823324A1 (de) * 1996-08-09 1998-02-11 Courtoy Rundlauf-Tablettierpresse
US6116889A (en) * 1997-01-31 2000-09-12 Korsch Pressen Gmbh Rotary press
EP1627727A3 (de) * 2004-08-19 2007-01-03 Fette GmbH Rundläufertablettenpresse
US20100136180A1 (en) * 2007-02-01 2010-06-03 Nestec S.A. Method and apparatus for making centre-filled shaped food products
US8876521B2 (en) * 2007-02-01 2014-11-04 Nestec S.A. Method and apparatus for making centre-filled shaped food products
US20100285166A1 (en) * 2009-05-11 2010-11-11 Fette Gmbh Rotary press
US8096801B2 (en) * 2009-05-11 2012-01-17 Fette Gmbh Rotary press

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DE6928976U (de) 1969-11-13

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