THE PATENTS ACT, 1970 THE COMPLETE SPECIFICATION
(See section 10)

1. PRESSURE ROLLER UNIT.
2. Dr. Bhakulesh Mafatlal Khamar residing at 201, "Ashadha Vasundhra Colony, Gulbai Tekra, Ellisbridge, Ahmedabad - 380006, Gujarat, India, Nationality Indian.
3. The following specification describes the nature of this invention.

Pressure Roller Unit
Field of the invention
The Present invention relates to a pressure roller unit for rotary press and/or tablet compression machine to provide prerequisite compression for manufacturing of tablets, which comprises of upper and lower pressure roller assembly, in which upper is fixed and lower is adjustable at the frame and carry the pressure rollers.
Background of the Invention
Pressure roller unit is an integral part of tablet compression machine, such pressure roller units comprises of one side fixed hinge side pillar, Upper and lower carrier with pressure rollers and bearings, other side adjustable pillar unit, bottom of which a cylinder assembly is mounted which makes square assembly of pressing unit. Such type of pressure roller unit are bulky, clumsy and difficult to maintain. Such pressure roller unit are made up of many component and have sharp edges and corners Because of the complex and inflexible structure, this types of pressure roller units are more prone to accidents.
Pressure roller units are usually more complicated in design, requires lot of cleaning and not very easy to maintain particularly when it come to comply with CGMP requirement. Pressure roller units requires constant inspection in running condition and if it is made by complicated design it may lead to an accident, generation of black particles, upper punch break down and/or face wear and tear.
US patent 6186762 describes a pressure roller unit of cylindrical designed rotary press of guide column type on which upper and lower press rolls are mounted. In such pressure roller unit press rolls being supported only through guide column.
US patent 6116889 provides a rotary press specially for preparing tablets, with at least one pressure roller unit. The said pressure roller unit has cylindrical designed of guide column type.
In the conventional machine the cleaning of pressure roller unit is in situ by using liquid spray which can be done by skill engineer and not the shop floor worker.
There for there is a need for pressure roller unit for rotary press or tablet compression which is easy to clean, easy to inspect while in running condition, easy to comply with CGMP requirement and easy to maintain.
2

Summary of the Invention
The basic object of the invention is therefore to provide an improved version of pressure roller unit for rotary press or tablet compression machine which is easy to clean, easy to inspect while in running condition, easy to comply with CGMP requirement and easy to maintain.
To accomplish this object, the present invention provides independent units of pressure roller assembly for upper and lower pressure roller, unit which can be set independently. Such pressure roller units are used in rotary presses which comprises of upper pressure roller assembly and lower pressure roller assembly. The said upper pressure roller assembly consists of upper head unit, upper holder which guide and holds upper head, upper press roll with bearings and eccentric pin for penetration adjustment and location pin provided to position roller axis with turret PCD (Pitch Circle Diameter). The said lower pressure roller assembly consists of lower carrier, fabricated assembly hinged at one side of main body, lower pressure roll with bushes, unit of cylinder assembly and holder with adjusting nut.
In the present embodiment both the upper and lower roller assembly are made independent of each other thus any time upper unit can be pulled out on its sliding tenon type guide ways for cleaning by loosening top cleaning bolts. Thus while change over proper cleaning can be done if required.
Further more pressure rollers are mounted on needle roller bearings and side face thrust bearing which gives smooth rotational movement of roller at higher pressure and will avoid press roll jamming problems and increase life of roller. Because of the needle roller bearing external oil lubrication does not require which further reduces the cleaning problem.
In the present embodiment mounting of upper pressure roller assembly to upper top plate is provided with securing mechanism and is optionally aided by positioning mechanism.
In the present embodiment Lower pressure roller assembly hinged at one side and other side with spherical piston roll and ball race arrangement mounted on holder with adjusting nut which results in making lower roller assembly more flexible which require for thickness adjustment.
In the present embodiment lower roller assembly adjustment is with motorized main compression control assembly consists of main compression, motor and gear box mounted with cabinet tap.
In another embodiment lower roller assembly adjustment is with manual main compression control assembly consists of gear box assembly, drive rod, universal joint and drive knobs mounted with cabinet tap.
The various features of the novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects

attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.
Brief description of the drawings
Figure-1 is a sectional view taken through the pressure roller unit from side and top view I Figure-2 is an enlarged vertical sectional view taken for upper pressure roller assembly
Figure-3 is an enlarged vertical sectional view taken for lower pressure roller assembly
Figure-4 is a vertical sectional view taken through the adjustable mounting of the lower pressure roller assembly on a cabinet tap.
Figure-5 is a view of a tablet cpmpression machine with the pressure roller unit.
Description of the preferred embodiments:
The pressure roller unit for rotary press or tablet pressing machine comprises of a upper roller assembly, lower roller assembly, solid structural square four side support pillar, upper top plate, cabinet tap.
Pressure roller unit for rotary press and/or tablet compression machine comprises of upper top plate 1, cabinet top 16, and four side support pillars 62, upper pressure roller carrier 5 and lower pressure roller carrier 17. Four side support pillars 62 makes solid structural square design framing on which upper roller carrier 5 bolted firmly on top plate 1 and lower roll carrier 17 pivoted at one side and adjustable on other side with holder 29 mounted on cabinet top 16 wherein the upper and lower pressure roller carrier mounts 5, 17 are likewise of a massive and stable design. The adjustment arrangement for upper pressure roller 6 is arranged in the upper roller carrier 5 mounted on upper top plate 1 and the adjusting drive 30, 52 for the lower pressure roller 25 mounted on cabinet top 16The upper adjustment arrangement in the upper roller carrier 5 is used for setting the upper pressure roller 6 and thus the depth of penetration of the upper punch 14 on which the upper pressure roller 6 acts and for adjusting the upper and lower pressure rollers 6, 25 respective, jointly i.e. in parallel, at a fixed distance and thus for adjusting the pressing zone in the die fitted on turret 64. The adjusting drive comprises of adjusting nut and drive gear main compression. The adjusting drive 30,52 for the lower pressure roller 25 is used to set the tablet thickness in relation to the upper pressure roller 5.
The upper pressure roller assembly as shown in fig. 2 is mounted on upper top plate 1 by clamping of nut 30. This arrangement is called securing mechanism. The upper pressure roller assembly as shown in fig. 2 is optionally aided by positioning mechanism. Positioning mechanism is an appropriate arrangement of guide pin 13.

The upper pressure roller assembly as shown in fig. 2 contains upper top plate 1 on which carrier holder top 2 fitted with screws 4 and upper roller carrier 5 on which upper roller bush front and rear 10,29 mounted and guide pin 13 located on both bushes holding upper pressure roller 69 in which needle roller bearing 8 and side thrust bearing with thrust washer 7 fitted. The adjustment arrangement of upper pressure roller is achieved with help of electronic positioning of upper press roll pin 13 by rotational positioning, fixing of penetration disc 11 with help of key provided on press roll pin 13 and penetration disc 11 fitted with screws fixed on upper roll bush front 10. Upper roller assembly located on position over the upper punch 14 and pitch circle of turret 64 and upper punch 14 if you reverse the above procedure. Upper roller assembly sliding on carrier holder top tennon slots wherein by carrying out reverse procedure of above we can take out upper roller assembly from turret 64 and upper punch 14. The unique and feature of this arrangement is upper roller assembly can be remove locking plate 66 fitted on carrier holder top 2.
The lower pressure roller 25, which is shown on larger scale in Fig.-3, contains lower pressure roller 25 with lower carrier assembly. Lower carrier assembly consists of lower roll carrier-20, GM hinge bush 18 and lower roll carrier bush 27. The lower carrier assembly mounted on cabinet top 16 on one side fixed hinge positioning by carrier fulcrum pin 19 and on other side on fork pressure cylinder 35, GM bush 37 and fork pin 36. As shown in fig. 3, lower pressure unit consists of lower carrier assembly 17, pressure roller 25 and cylinder assembly 35 with piston rod 32, Hanging on piston rod guide 31 and adjusting nut 30 with thread fitting adjustable mounted on holder 29 which is fitted on cabinet top 16. Lower pressure roller 25 mounted on lower carrier assembly 17 with lower roll carrier bush 27 locating press roller pin 22 which is locked from side with locking cap 23 and alien cap screw 21, for free rotation of pressure roller 25 while tablet pressing. Needle roller bearing 24 fitted in between pressure roller 25 and lower press roller pin 22.
The adjusting mechanism for lower pressure roller 25, which is shown in larger scale in fig. 4 consists of synchroneous motor 59 with gear box 56 mounted on cabinet top 16 through main compression motor mounting flange 58 and drive transmission from synchroneous motor 59 to main compression connecting shaft 57 to gear box 56 to main compression connecting shaft 57 to gear box 56 to main compression drive shaft 53 to drive gear main compression 52 to adjusting nut 30. Clock wise rotation of adjusting nut 30 with life lower pressure roller 25 upward which result in decrease in tablet thickness and anti clock wise rotation of adjusting nut 30 will lower down lower pressure roller 25 which result in increase in tablet thickness.
Further hydraulic cylinder assembly mounted on adjusting nut 30 by spherical resting type (swiveling type) hydraulic piston rod 32 and piston rod guide 31 and on other end piston 41 with seals 48, 49, 50 bottom cover 42 and hex nut 44, spring 40, upper gland 38, gland bush 43, cylinder body upper 39 and fork pressure cylinder 35 fitted as cylinder assembly which is single side pressure acting type. Lower roll carrier 17, one side hinged on cabinet tap 16 with carrier fulcrum pin 19 as shown in fig 3 and other side with fork pressure cylinder 35 of cylinder assembly by fork pin 36. Acting hydraulic pressure on cylinder assembly piston41 will give compression force on lower punch while tablet making and continuous pressing taking place at time of turret 64 rotation between upper punch 14 and lower punch 15 as shown in fig 3. For

setting the minimum thickness of the tablet when the lower pressure roller 25 and adjusting nut 30 in up position, bottom cover 42 is made loose or rotate anti clock wise which results in positioning or lifting lower pressure roller and lower roll carrier resulting in setting of minimum thickness required. This adjustment should be changed if upper penetration as explained earlier fig 2 increases ore decreases.
Fig. 5 shows a view of the entire rotary tabletting press, in which the pressure roller unit comprising the upper roll carrier 5 and lower roll carrier 17 and upper and lower pressure rollers 6 and 25 is placed on upper top plate 1 and cabinet top 16 respectively. Fig 5 shows that the pressing force from rollers 6,25 is transmitted through the pressure rod 62 and lock nut 63 fitted on four corners between upper top plate 1 and cabinet top 16, connected to the bottom base plate 6 through four leg support 67. The upper and lower punches 14 and 15 engage dies of the die plate 64. The respective upper and lower pressure roller 6 and 25 act on the respective punch heads 14 and 15 during the rotation of the die table of the turret 64. The turret 64 is driven via a internal ring and pinion 69, 70 via gear box and drive motor 71 and 72. The massive cabinet top plate 1 accommodating upper pressure roller 6, the turret 64 and the drive motor 72 is mounted on bottom base plate 68 of rotary tabletting press by means of a plurality of rubber-bonded to metal mountings 77, the rotary tabletting press being carried by four leg support 67 which is fitted in between cabinet top 16 and bottom base plate 68.
While specific embodiments of the invention have been shown and described in detailed to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied other wise without departing from such principles.

LIST OF REFERENCE NUMBERS
SR.NO. DESCRIPTION
1 JPPER TOP PLATE
2 ( 3ARRIER HOLDER TOP
3 i ULEN CAP SCREW M16x30
4 , ^LLEN CAP SCREW M12x75
5 UPPER ROLL CARRIER
6 PRESS ROLL UPPER
7 THRUST BEARING WITH WASHER
8 NEEDLE ROLLER BEARING NO.RNA-6911
WITH OUT INNER RING
9 UPPER ROLL BUSH REAR
10 UPPER ROLL BUSH
11 PENETRATION DISK
12 ALLEN CAP SCREW M6x25
13 GUIDE PIN
14 UPPER PUNCH
15 LOWER PUNCH
16 CABINET TOP
17 LOWER ROLL CARRER
18 HINGE BUSH G.M.
19 CARRIER FULCRUM PIN
20 LOCKING CAP
21 ALLEN CAP SCREW M12x35
22 LOWER PRESS ROLL PIN
23 LOWER SEALING RING
24 NEEDLE ROLLER BEARING NO.RNA-6911
25 LOWER PRESS ROLL PIN
26 LOCKING CAP
27 LOWER ROLL CARRER
28 ALLEN CAP SCREW M6x16
29 HOLDER
30 ADJ. NUT
31 PISTON ROD GUIDE
32 HYD.PISTON ROD GUIDE
33 ALLEN CAP SCREW M20x90
34 ALLEN CAP SCREW M10x45
35 FORCK PRESSURE CYLINDER
36 FORK PIN
37 G.M. BUSH
38 GLAND UPPER
39 CYLINDER BODY UPPER
40 SPRING
41 PISTON
42 BOTTOM COVER
43 GLAND BUSH
44 HEX NUT M38x2
45 WIPER 45x45x7
46 P.U. SEAL 45x45x11
47 O' RING
48 RING 99.5x115x6
49 O' RING
50 O' RING 38x45
51 BUSH FORK CYLINDER
52 DRIVER GEAR MAIN COMP.
53 MAIN COMP. DRIVE SHAFT
54 GEAR LOCK WASHER
55 ALLEN CAP SCREW M6x20

56 GEAR BOX
57 MAIN COMP. CON. SHAFT
58 MAIN COMP. MOTOR MOUNT. FLANGE
59 MOTOR
60 LOCK WASHER
61 COVER
62 PRESSURE ROD ,
63 LOCK NUT PRESSURE ROD
64 TURRET
65 LOCKATOR PIN
66 LOCKING PLATE
67 LEG SUPPORT
68 BOTTOM BASE PLATE
69 INTERNAL GEAR
70 HELICAL PINION
71 GEARBOX
72 DRIVER MOTOR
73 V-BELT
74 V PULLEY GEAR BOX
75 V-PULLEY DRIVE MOTOR
76 MOTOR SLIDE ASSEMBLY
77 RUBBER BONDED TO MATEL MOUNT. PAD
78 HOOD

Claims:
1. Pressure roller unit comprising of a upper roller assembly mounted on upper top plate and lower roller assembly mounted on cabinet top wherein mounting of upper pressure roller assembly is provided by securing mechanism and is optionally aided by positioning mechanism.
2. The pressure roller unit in accordance with claim 1, wherein said upper pressure roller assembly comprises carrier holder top , upper carrier block and pressure roller assembly.
3. The pressure roller unit in accordance with claim 1, wherein said upper pressure roller assembly has a bearing between upper pressure roller and upper roll carrier.
4. The pressure roller unit in accordance with claim 1, wherein said lower pressure roller assembly comprises of lower carrier assembly, lower press roll assembly, cylinder assembly and main compression control assembly.
5. The pressure roller unit in accordance with claim 1, wherein said securing mechanism includes clamping, use of bolt and/or nut and like.
6. The pressure roller unit in accordance with claim 1, wherein said Positioning mechanism includes guide pin and/or stopper block.
7. Guide pin claimed in claim 6 can be either plain pin and/or Spring loaded pin.

DR. BAKULESH KHAMAR DIRECTOR RESEARCH KARNAVATI ENGINEERING LIMITED
Dated this 30th Day of September 2002