System and method for automatically feeding, inspecting and diverting tablets for continuous filling of tablet containers

• US 5,522,512 A
• Filed: 05/09/1994
• Issued: 06/04/1996
• Est. Priority Date: 05/09/1994
• Status: Expired due to Fees

• Current Assignee: Merck & Co., Inc.
• Original Assignee: Merck & Co., Inc.
• Inventors: Archer, John R., Cumpstey, David E., Owen, Stephen, Gray, Richard H.
• Primary Examiner(s): Dayoan, D. Glenn
• Application Number:
  US08/239,794
• Time in Patent Office: 757 Days
• Field of Search: 209/580, 209/581, 209/582, 209/586, 209/587, 209/657, 209/910, 209/920, 209/539, 53/52
• US Class Current: 209/580
• CPC Class Codes: B07C 5/342 according to optical properties, e.g. colour according to radiation transmittivity B07C5/3416
• CPC Class Codes: B07C 5/38 Collecting or arranging articles in groups
• CPC Class Codes: B65B 5/103 for packaging pills or tablets
• CPC Class Codes: B65B 57/14 and operating to control, or stop, the feed of articles or material to be packaged
• CPC Class Codes: G01N 21/9508 Capsules; Tablets
• CPC Class Codes: G06V 20/66 Trinkets, e.g. shirt buttons or jewellery items recognising microscopic objects G06V20/69
• CPC Class Codes: Y10S 209/92 Vibratory feed conveyor

Abstract

A system and method for automatically feeding, inspecting and diverting tablets for continuous filling of tablet containers includes a tablet conveyor system which divides the tablets in a plurality of tablet streams for inspection by color, size and shape. Following the tablet inspection, each tablet passes through a tablet diverter which diverts the tablets to a recycle stream, reject stream or one of two bottle filling positions based upon instruction from the inspection. A bottle conveyor system is provided which feeds empty bottles into a bottle escapement mechanism which positions the empty bottles for filling. Filled bottles are moved from the bottle escapement mechanism to an exit conveyor. The entire system is computer controlled by various control mechanisms to enable the system to be fully operational without operator assistance.

Claims

1. A system for automatically filling bottles with tablets comprising:

a) a hopper for storing tablets;

b) a feeder for diverting said stored tablets into a plurality of tablet streams;

c) a conveyor for continuously conveying said plurality of tablet streams from said feeder past an inspection station, said inspection station comprising a means for inspecting each tablet passing said inspection station by color, shape and size and producing a first signal indicating whether each tablet satisfies predetermined target values as well as a tablet count;

d) a tablet diverter receiving said tablets passing said inspection system, said tablet diverter including flaps to divert a said tablet into a stream for recycling, rejection, or bottle filling each said flap responsive to said first signal from said inspection station for diverting a tablet to a said stream;

e) a bottle filling station for receiving tablets satisfying said predetermined target values and diverted to said bottle filling stream, said bottle filling station including;

i) bottle escapement device positioning at least one empty bottle for filling;

ii) an in-feed bottle conveyor feeding a stream of empty bottles to said bottle escapement device; and

iii) an out-feed bottle conveyor receiving filled bottles from said bottle escapement device and directing a stream of filled bottles away from said bottle escapement device;

f) a controller regulating said feeder, said inspection station, said tablet diverter such that tablets can be fed automatically from said hopper to said inspection system, inspected, and diverted into one of said recycle, reject or bottle filling streams and further regulating said bottle filling system such that empty bottles can be continuously filled by tablets diverted to said bottle filling stream.

2. The system of claim 1 wherein each plurality of tablet streams further comprises a plurality of pairs of tablet streams, each pair of tablet streams having an inspection system, tablet diverter and bottle escapement device.

3. The system of claim 1 wherein said feeder is a vibratory feeder.

4. The system of claim 1 further comprising:

a) optical sensors positioned between said tablet diverter and said bottle escapement device for detecting a number of tablets entering said bottle escapement device, generating a second signal indicative of said number and transmitting said second signal to said controller; and

b) a bottle diverter downstream of said bottle escapement device;

c) wherein said controller compares said second signal with said first signal and diverts a filled bottle if said number of tablets detected by said optical sensors fails to correspond to a number of tablets diverted for bottle filling by said tablet diverter.

5. The system of claim 1 wherein said conveyor system includes of up to four conveyor belts for said tablet stream.

6. The system of claim 1 wherein said means for inspecting further comprises inspection cameras for inspecting said tablets.

7. The system of claim 1 further comprising a partitioned chute in communication with said hopper, said partitioned chute dividing said stored tablets into a plurality of tablet streams onto said vibratory feeder.

8. The system of claim 1 wherein said controller first compares a sensed color, shape or size with predetermined target values for color and size and produces said first signal indicating whether an inspected tablet should be recycled, rejected, accepted or identified as a rogue tablet and if an inspected tablet is accepted then regulates said tablet diverter to divert said accepted tablet to one of said pair of bottles in said bottle escapement device.

9. The system of claim 1, wherein said bottle escapement device comprises a star wheel having at least a pair of bottle receiving stations and means to intermittently rotate said star wheel to position an empty bottle in at least one of said bottle filling stations to receive a tablet diverted to said bottle filling stream.

10. The system of claim 1 wherein said hopper has a valve controlled by said controller for directing tablets to said feeder.

22. The system of claim 1 wherein said bottle escapement device comprises:

a) a body having;

i) a first opening, a first recess sized to receive said container and a first chute interconnecting said first opening and said first recess;

ii) a second opening, a second recess sized to receive said container and a second chute interconnecting said second opening and second recess; and

b) means on said body for connecting said body to a drive that rotates said body in 180°

segments;

c) wherein said first recess and said second recess are located in said body on a line of said body intersecting a longitudinal axis thereof;

d) wherein said first and second openings are sized and said first and second chutes are configured to receive said tablets so that a bottle in either said first or said second recess can be continually filled with said tablets traveling through respective said first or second chutes while said body is rotated said 180°

segment.

23. The system of claim 22 further comprising a device for rotating said body in said 180°

segments.

24. The system of claim 22 wherein said first opening is aligned with said longitudinal axis of said body and said second opening surrounds said first opening and extends around a peripheral portion of said body.

25. The system of claim 22 wherein said body is cylindrical in shape, said first and second recesses are dramatically opposed on a side surface of said body and said first and second openings are located on one end of said cylindrical body.

27. The system of claim 8 wherein said predetermined target values comprise a tablet shape template.

11. A method of automatically filling bottles with tablets comprising the steps of:

a) providing a source of tablets;

b) separating said source of tablets into a plurality of tablet streams;

c) feeding said plurality of tablet streams such that each said tablet stream comprises a continuous stream of discrete tablets;

d) inspecting each discrete tablet for at least one of size, shape, color and count;

e) diverting said inspected tablets based on said inspection step into a recycle stream, reject stream and an accept stream;

f) providing a continuous stream of empty bottles;

g) positioning at least one empty bottle to receive diverted tablets from said accept stream to fill said empty bottle;

h) recovering said filled bottle; and

i) controlling said separating, feeding inspecting, diverting, providing, positioning and recovering steps to automatically fill said empty bottles with a predetermined number and type of tablet.

12. The method of claim 11, wherein said inspection step further comprises identifying a rogue tablet and said controlling step ceases automatic filling until said rogue tablet is diverted.

13. The method of claim 11 further comprises verifying said count of tablets made during said inspection step after diversion and prior to filling said empty bottle and diverting said filled bottle if a count from said verification step differs from a count derived by said inspection step.

14. The method of claim 11 further comprising the step of determining a target tablet size, shape and color by:

i) feeding target tablets of a predetermined size and color for inspection;

ii) inspecting said target tablets;

iii) recycling said target tablets until said target tablet size and color are determined; and

iv) storing said target tablet size for comparison with inspected tablets during said inspection step.

15. The method of claim 11 wherein each inspected tablet is diverted only once.

16. The method of claim 11 wherein said separating step further comprising dividing said plurality of tablet streams into a plurality of pairs of tablet streams.

17. The method of claim 16, wherein each said pair of tablet streams has a discrete inspection step.

18. The method of claim 11 wherein said inspecting step first determines whether to recycle, reject or accept an inspected tablet, and if said inspected tablet is accepted, said inspected tablet is diverted to one of two empty bottles positioned to be filled.

19. The method of claim 17 wherein said controlling step senses when a bottle becomes filled and diverts said accepted tablets to an empty bottle.

20. The method of claim 11 wherein tablets entering said recycle stream are directed to said hopper.

21. The method of claim 11 wherein a plurality of empty bottles are provided for said positioning step and bottles not positioned for filling are recycled for subsequent positioning.

26. The method of claim 11 wherein said one empty bottle is continually filled while being moved from a bottle filling station to a bottle exit station, and after filling, said bottle is ejected and replaced with an empty bottle for subsequent filling.

28. The method of claim 11 wherein said inspecting step includes generating a tablet shape template for inspecting tablet shape.