FORM 2
THE PATENTS ACT, 1970 THE COMPLETE SPECIFICATION
(See section 10)
1. FORCE FEELDPROVISION SPEED TABLET COMPRESSION MACHINE.
2. Dr. Bhakulesh Mafatlal Khamar residing at 201, "Ashadha Vasundhra Colony, Gulbai Tekra, EUisbridge, Ahmedabad - 380006, Gujarat, India, Nationality Indian.
3. The following specification describes the nature of this invention.

FORCE FEEDER FOR HIGH SPEED TABLET .COMPRESSION
MACHINE
'»\ »•; ■-
Field of the invention \-
The present invention pertains to a Force Feeder for high speed tablet compression machine which has a staged (peddle) design which provides proper filling of die cavities of tablet compression machines even at a high speed of turret.
Background of the Invention
Force feeder is one of the most important components of tablets compression machine. The function of force feeder in tablet compression machines is to feed powder/granules to die cavities for manufacturing of tablets. If the force feeder is not appropriately designed it may result in weight variation of tablet, air entrapment, and increased rejection rate of tablet. The normal force feeder design works well as long as speed of machine is slow. It does not work properly when the speed of machine is increased. Traditional force feeder if used in high speed tablet compression machine it may result in non-formation of tablet and ultimately results in decreased yield.
Traditionally feeders to tablet compression machines are of two types, gravity or force feeder. Force feeder are of rotary type or centrifugal type.
Rotary type of force feeder are traditionally used. When turret speed is increased for increasing output of tableting machine the conventional force feeder are found to be inadequate so there is a need to improve force feeder to feed cavities properly with granulation at high speed.
Summary of the Invention
The present invention relates to a Force feeding system for a tableting machine to provide in which the powdered or granulated material to be tableted is fed on to the surface of rotating die table by three stage rotating impeller force feeding system' so as to fill dies in the die table and be compressed into a tablet in each di between a pair of punches one of the punches being subsequently

withdrawn from the die and the other punch being pushed through
the die to eject the tablet from the die.
In a conventional force feeding system for a tabletting machine is of two stage means two impeller design type wherein the present invention provides force feeder is of three stage means three impeller design type which give proper feeding of granules/powered on die table which gives consistence weight of tablet even at higher speed of machine.
Present invention provides force feeder for high speed tableting machine comprise of feeder body with impeller assembly mounted on feed frame plate by L- bracket which is firmly fixed on cabinet top and force feeder drive assembly mounted at bottom side of cabinet top and coupled with universal joint and drive rod to give positive rotational movement to three stage impeller by gear train assembly.
In the preferred embodiment feeder body with impeller assembly comprising of feeder bottom plate, feeder body, top cover and cover in which bottom two impeller are fixed on bearing and shaft between feeder bottom plate and feeder body. A drive gear train assembly.
Further more force feeder drive assembly comprising of geared motor mounted on bottom side of cabinet top by motor mounting housing which is coupled for driving top impeller assembly through drive rod motor side to universal joint to driver spindle to driver and top impeller shaft. Now on top impeller shaft a gear(35 teeth) mounted which drives two bottom impeller through gear train assembly. The said gear train assembly consists of on gear of 40 teeth and five gear of 24 teeth.
In another embodiment of present invention, the gear train assembly for driving bottom impeller can be replaced by a timing pulley and timing belt driven assembly.
In another embodiment of present invention force feeder drive assembly placed at bottom side of cabinet top to have bottom driving of force feeder assembly can be replaced by mounting the same on upper top plate and coupled with top impeller assembly by universal joint and detachable drive rod.

Brief Description of the drawings:
Fig.-1 Vertical sectional view taken through the force feeding system showing feeder housing assembly/drive mechanism assembly and stand assembly.
Fig.-2 is an enlarged vertical sectional view taken for feeder body housing assembly with feeder stand.
Fig.-3 is an enlarged vertical sectional view taken for feeder drive motor assembly with gear train assembly.
Fig.-4 is a view of a rotary tableting press with the force feeder assembly and feeder drive assembly.
Description of the preferred embodiment
The force feeder unit for rotary tableting machine comprises of three stage force feeder assembly fig. 2., in which impellers are rotating by feeder drive assembly fig.-3. A scraper plate - 55 with scraper homing 54 mounted on feeder stand 29 for scraping the excess powder lying on the rotary die table (turret) and take off plate 51 mounted on feeder body for taking out tablet from rotary die table.
The force feeder feeding assembly for rotary tableting presses comprises a massive designed three stage(peddle) designed with a bottom drive motor as shown in fig. 3 with gear box 1 which is mounted bottom face side of cabinet top 34 by motor mounting housing-2 bolted on top and bottom flanges by hex bolt 5 for rigid clamping. The driver rod motor side 3 driven by motor with gear box 1 which is at one end fixed with lock washer 7 and hex bolt 5, and other end universal joint 8 with grub screw 9 locked, which is further connected to drive spindle 10 with grub screw 9, a cylindrical pin 11 fitted on drive spindle 10 on which stopper bush 12 and driver 13 is sliding against driver spring 14 which helps in engagement of driver 13 with top impeller shaft 19 driving slot for rotation of top impeller. The driver 13 is guided by nylon bush 15 which is fitted on driver bearing housing 16 located on feeder mounting plate 29 by alien cap screw 17, for removal of face feeding assembly as shown in fig 2 from feeder mounting plate,

unlock locking knob 40 and disengage driver 13 from tap impeller shaft 19 by pushing sliding stopper bush 12 down and slide down force feeding assembly from feeder stand for cleaning or maintenance or inspection. The top impeller assembly 24 is mounted on D-type slot of top impeller shaft 19 and bolted by locking washer 30 and hex bolt 31 firmly and top impeller shaft 19 rotating on sealed ball bearing 22 and oil seal 20 mounted on top cover 26 and feeder body 27. A gear (35 teeth) fitted on top impeller shaft 19 which is further connected to gear train assembly five gears of (24 teeth) 33 through idler gear(40 teeth) 32 which rotate bottom impeller assembly Lh and Rh 41 and 48. Gear train assembly33 comprises of five gears (24 teeth) and idler gear (40 teeth) 32 fitted and rotating on idler gear shaft 45 which is both end located on top cover 26 and feeder body 27 by sealed ball bearing 42 and impeller spaler 23 for free high speed rotational motion. Powder or granulated material is fed through inlet guide 58 over top impeller assembly 24 and top cover 26 then the cavity further transfer to bottom plate,28 and Rh side cavity i.e. bottom impeller Rh side 48 through eliptical open window provided. Top impeller assembly 24 rotating 1:1 ration of speed of output shaft of motor with gear box 1 and further speed increases for bottom impeller assembly Lh and Rh 41 and 48 as the top impeller 24 rotating at higher speed so proper powder/granulated material takes place to the bottom impeller assembly Rh and Lh 41 and 48 which leads to a proper filling of die cavity at the higher speed which results in better weight variation in tablet, less air entrapment, increased in yield of tablet due to less rejection in tablet produced.
The feeder bottom plate 28 fitted with feeder body 27 by brass slotted csk screw 53 and which is having cavity to store the powder/granulated material to be fed. on die table through openings provided at bottom of bottom plate 28 and rotating bottom impeller Rh 48 even at higher speed and bottom impeller Lh 41 also bring back powder is excess removed by dozing system. So during high speed tabletting feeder feeder bottom plate 28 cavities are filled with granulated material which is fed to die packets by rotating impellers(peddles) Rh and Lh 48 and 41 respectively. A gear train assembly is fitted on top side cavity of feeder body 27 and on which top cover 26 is fitted by csk screw 49. This top cover bottom side having bores to align gear train assembly and on top side having cavity on which top impeller assembly 24 is rotation and powder or granulated material directly coming in this cavity which is further transferred to feeder bottom

plate 28 and bottom irripeller Lh and Rh 41 and 48 respectively through opening provided from top cover 26 and feeder body 27. A top cover 26 is closed on top by polycarbonate transparent sheet of cover 25 by csk screws 49 and on which in let guide 58 is fitted which is hollow through which powder or granulated material is transferred to force feeder assembly.
As shown in fig 2, force feeder component jointly consisting of feeder bottom plate 28 feeder body 27, top cover 26, cover 25 and impeller top 19 and bottom Lh and Rh, 41 and 48 respectively . This assembly is fitted on feeder mounting plate 29 by locking knob 40. A feeder mounting plate 29 further mounted with L bracket Lh 35 and Rh 36 side by alien lap screw 39 and further firmly fixed with cabinet top 34 by alien cap screw 37. A guard for L bracket 56 for Lh side 35 and Rh side 36 is fixed by adjusting screw 57 to close driver with stop bush assembly. A scraper bracket 543 and scraper plate 55 to scrap the excess powder or granulated material from turret die part face which is further circulated to opposite force feeder assembly and take of plate 51 will take out/guide ejected tablet on turret die table to the discharge chute of the machine.
Fig 4 shown a view of entire rotary tabletting press, in which force feeder assembly comprising of cabinet top 34 on which top side L bracket Lh and Rh 35 and 36 respectively fixed on which feeder mounting plate 29 fixed on which feeder bottom plated feeder body 28 and 27 firmly fitted with locking knob 40, this force feeder assembly consisting of top impeller assembly 24, bottom impeller Lh and Rh side 41 and 48 respectively. Gear train assembly to rotate three impeller for constant and proper feeding of powder/granulated material on die cavity. The drive assembly for force feeder assembly is mounted at bottom side of cabinet top 34 which consist of motor with gear box 1, motor mounting housing 2, drive rod motor side 3, universal joint 8, driver spindle 1, driver 13 and top impeller shaft 19 which drives top impeller assembly and bottom impeller assembly.
While specific embodiments of the inventioh have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.

Claims:
1. Force feeder assembly comprising of feeder pedal/s along pitch circle and an
independent input pedal/s to feed the feeder pedals.
2. Force feeder assembly in accordance with claim 1 wherein the said feeder
pedals are synchronized with each other.
3. Force feeder assembly in accordance with claim 1 wherein the said input pedals are mounted at different level/s in any appropriate position with respect to feeder pedal.
4. Force feeder assembly in accordance with claim 1 wherein the said feeder pedal/s are mounted at the bottom of input feeder and on the pitch circle.
5. Force feeder assembly in accordance with claim 1 wherein input pedal is at the
same level as that of feeder pedal but having its axis of rotation on circle other
than pitch circle.
6. Force feeder assembly in accordance with claim 1 and 2 wherein the said input
pedals is directly driven by drive mechanism of force feeder and subsequent
synchronized motion to the other feeder pedals.
Dated this 30th Day of September 2002
DR. BAKULESH KHAMAR DIRECTOR RESEARCH KARNAVATI ENGINEERING LIMITED