# Patent

## Title
System and method for dispensing prescriptions

## Abstract

An apparatus for transporting a workpiece within a three-dimensional volume includes: a first rail extending in a generally horizontal direction; a first carriage that is slidably connected to the first rail for movement in the horizontal direction; a second rail attached to the first carriage and extending in a generally vertical direction; a second carriage that is slidably connected to the second rail for movement in the vertical direction; a traveler unit mounted to and revolvable along a generally horizontal annular path about the second carriage; and a gripper unit mounted to the traveler unit configured to grip the workpiece.

## Background
RELATED APPLICATION
The present application is a divisional of and claims priority from U.S. application Ser. No. 10/437,353, filed May 13, 2003, now U.S. Pat. No. 7,971,541, entitled “SYSTEM AND METHOD FOR DISPENSING PRESCRIPTIONS”, which claims priority from U.S. Application No. 60/380,402, filed May 14, 2002, the disclosures of which are incorporated herein as if set forth fully.


FIELD OF THE INVENTION
The present invention is directed generally to the dispensing of prescriptions of pharmaceuticals, and more specifically is directed to the automated dispensing of pharmaceuticals.
BACKGROUND OF THE INVENTION
Pharmacy generally began with the compounding of medicines which entailed the actual mixing and preparing of medications. Heretofore, pharmacy has been, to a great extent, a profession of dispensing, that is, the pouring, counting, and labeling of a prescription, and subsequently transferring the dispensed medication to the patient. Because of the repetitiveness of many of the pharmacist's tasks, automation of these tasks has been desirable.
Some attempts have been made to automate the pharmacy environment. Different exemplary approaches are shown in U.S. Pat. No. 5,337,919 to Spaulding et al. and U.S. Pat. Nos. 6,006,946; 6,036,812 and 6,176,392 to Williams et al. These systems utilize robotic arms to grasp a container, carry it to one of a number of bins containing tablets (from which a designated number of tablets are dispensed), carry it to a printer, where a prescription label is applied, and release the filled container in a desired location. Tablets are counted and dispensed with any number of counting devices. Drawbacks to these systems typically include the relatively low speed at which prescriptions are filled and the absence in these systems of securing a closure (i.e., a lid) on the container after it is filled.
SUMMARY OF THE INVENTION
The present invention is directed to an automated system and method for dispensing pharmaceuticals, particularly tablets and capsules, and other small discrete objects. Embodiments of the system and method are capable of receiving a patient's prescription information, selecting a container, labeling the container, dispensing the tablets or capsules into the labeled container, applying a closure to the filled, labeled container, and offloading the container to a designated location. Preferably, the tablets are dispensed with high speed dispensing bins that employ forced air to agitate and singulate the tablets. The other functions within the system are typically carried out at stations designed to offer speed, flexibility and precision to the dispensing operation.
As a first aspect, embodiments of the invention are directed to a method of dispensing solid pharmaceutical items of substantially identical size and configuration from a bulk of such solid pharmaceutical items stored in a housing. The method comprises the steps of: providing a singulating bin comprising a hopper and a dispensing channel fluidly connected thereto, the dispensing channel defining a flow path; applying a forwardly-directed jet into the dispensing channel; passing a series of solid pharmaceutical items in single file from the hopper into the dispensing channel; accelerating the solid pharmaceutical items in the dispensing channel with the forwardly-directed jet; counting the number of solid pharmaceutical items that pass a predetermined point in the dispensing channel; comparing the number of solid pharmaceutical items that have passed the predetermined point with a predetermined number; and applying a rearwardly-directed jet into the dispensing channel after a predetermined number of solid pharmaceutical items have passed the predetermined point to draw any additional items in the dispensing channel back into the hopper. This method can dispense pharmaceutical items rapidly and accurately.
As a second aspect, embodiments of the present invention are directed to an apparatus for dispensing solid pharmaceutical items, comprising: a frame; a container dispensing station attached to the frame; a labeling station attached to the frame; a labeling carrier configured to grasp and transport a container from the container dispensing station to the labeling station; a dispensing station having a plurality of bins that receive and dispense solid pharmaceutical items; a dispensing carrier that receives a labeled container from the labeling carrier and transports the labeled container to the dispensing station for filling with solid pharmaceutical items from one of the bins; and a controller operatively connected with and controlling the operation of the container dispensing station, the labeling station, the labeling carrier, the dispensing station, and the dispensing carrier. Such an apparatus can dispense filled, labeled pharmaceuticals rapidly and accurately.
As a third aspect, embodiments of the present invention are directed to an apparatus for dispensing solid pharmaceutical items, comprising a dispensing station comprising a plurality of bins for storing the items, each of the bins containing items of substantially identical size and configuration, and at least some of the bins containing items that differ in size and/or composition from the items contained in others of the housings. Each of the bins includes a dispensing outlet on one side that dispenses items, a replenishment opening on a side thereof opposite the dispensing outlet, and an electronic unit that monitors the counting of items traveling through the dispensing outlet. The bins are mounted on a frame such that the dispensing outlets face an access region within the frame and the replenishment openings face away from the frame. A dispensing carrier is configured to transport containers to be filled with the items. The dispensing carrier is positioned within the access region. A controller controls the operation of the dispensing carrier. In this configuration, bins can be replenished without removing them from the frame or interfering with the operation of the apparatus as it dispenses from other bins.
Those skilled in this art will recognize that many of the individual stations within the apparatus described above and combinations thereof also represent additional embodiments of the invention.



BRIEF DRAWINGS OF THE DRAWINGS
FIG. 1 is a flow chart illustrating an embodiment of a method according to the present invention.
FIG. 2 is a perspective view of a pharmaceutical tablet dispensing system according to the present invention.
FIG. 3 is a cutaway view of the system of FIG. 2 illustrating the container dispensing station, the labeling carrier, the dispensing carrier, and the closure dispensing station.
FIG. 4 is a top view of the container dispensing station of the system of FIG. 2 showing the cup holding a container in the donating position.
FIG. 5 is a top view of the container dispensing station of FIG. 4 showing the cup holding a container in the receiving position.
FIG. 6 is an enlarged perspective view of the container dispensing station of FIG. 4.
FIG. 7 is a perspective view of the gripping unit of the label carrier of the system of FIG. 2 with the fingers thereof rotated to a radially inward position and the unit itself in a raised position above the container-dispensing cup.
FIG. 7A is a section view of the gripping unit of FIG. 7.
FIG. 8 is a perspective view of the gripping unit of FIG. 7 with the fingers thereof in the process of rotating radially outwardly and the unit itself in a lowered position into a container in the container dispensing cup.
FIG. 9 is a perspective view of the gripping unit of FIG. 7 with the fingers thereof rotated to a radially outward position and the unit itself rising with the container above the container dispensing cup.
FIG. 10 is a bottom view of the gripping unit of FIG. 7 with the fingers thereof in rotated to a radially inward position.
FIG. 11 is a bottom view of the gripping unit of FIG. 7 with the fingers thereof rotated to an intermediate position.
FIG. 12 is a bottom view of the gripping unit of FIG. 7 with the fingers thereof in rotated to a radially outward position.
FIG. 13 is a schematic top view of the labeling station of the system of FIG. 2 prior to the application of a label on a container.
FIGS. 14-16 are schematic top views of the labeling station of FIG. 13 during the application of a label on a container as the container is held and rotated by the gripping unit of FIG. 7.
FIG. 17 is an enlarged perspective view of the transfer of a container from the labeling carrier of FIG. 7 to the dispensing carrier of the system of FIG. 2.
FIG. 18 is an enlarged perspective view of the lower carriage and the grip unit of the dispensing carrier of FIG. 17 illustrating that the lower carriage can be moved vertically and horizontally and that the grip unit can be rotated about two axes.
FIG. 19 is an enlarged perspective view of a dispensing bin employed in the system of FIG. 2.
FIGS. 20A and 20B are section views of the dispensing bin of FIG. 19 showing how the size of the dispensing channel of the dispensing bin can be adjusted.
FIG. 21 is a greatly enlarged side view of the dispensing bin of FIG. 19 showing how the height of the dispensing channel can be adjusted.
FIG. 22 is a bottom view of the dispensing bin of FIG. 19 showing how the width of the dispensing channel can be adjusted.
FIG. 23 is an enlarged exploded view of the dispensing bin of FIG. 19 showing its interconnection with the low pressure manifold, the high pressure conduit, and the electronics mounted on the frame of FIG. 3.
FIG. 23A is a schematic diagram of the controller and three exemplary connector boards from the frame and three exemplary bin-controlling circuit boards.
FIG. 23B is a schematic diagram of another embodiment of the controller of the system of FIG. 2.
FIG. 24 is an enlarged assembled view of the dispensing bin of FIG. 19 with the low pressure manifold, the high pressure conduit, and the electronics mounted on the frame.
FIG. 25 is an enlarged side view of the securing member of the dispensing bin of FIG. 19 showing how the securing member locks the dispensing bin in place on the frame.
FIG. 26 is an enlarged section view of the assembled dispensing bin and frame of FIG. 24 with tablets loaded into the bin.
FIG. 27 is an enlarged section view of the assembled dispensing bin and frame of FIG. 24 with tablets being agitated by low pressure air flowing upwardly through the bin.
FIG. 28 is an enlarged section view of the assembled dispensing bin and frame of FIG. 24 with high pressure air being applied to the dispensing channel, such that tablets are drawn therein in single file in a lengthwise orientation.
FIG. 29 is an enlarged section view of the assembled dispensing bin and frame of FIG. 24 with a desired number of tablets dispensed into the container.
FIG. 30 is an enlarged perspective view of the closure dispenser of the closure dispensing station of the system of FIG. 2.
FIG. 31 is an enlarged perspective view of the closure dispenser of FIG. 30 with the closure bin removed.
FIG. 32 is a greatly enlarged section view of a closure unable to be oriented with the closure dispenser of FIG. 30.
FIG. 33 is a greatly enlarged section view of a closure able to be oriented with the closure dispenser of FIG. 30.
FIG. 34 is a bottom perspective view of the closure dispenser of FIG. 30.
FIG. 35 is an enlarged side perspective view of the closure holder of the system of FIG. 2 with a filled container in a lower position.
FIG. 36 is an enlarged side perspective view of the closure holder of FIG. 35 with the container raised to engage a closure.
FIG. 37 is an enlarged side perspective view of the closure holder of FIG. 35 with the filled, closed container lowered.



DETAILED DESCRIPTION OF THE INVENTION
The present invention will now be described more fully hereinafter, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, like numbers refer to like elements throughout. Thicknesses and dimensions of some components may be exaggerated for clarity. It will be understood that when an element is referred to as being “connected” or “coupled” to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly connected” or “directly coupled” to another element, there are no intervening elements present.
As described above, the invention relates to a system and process for dispensing pharmaceuticals. The process is described generally with reference to FIG. 1. The process begins with the identification of the proper container, tablets or capsules and closure to be dispensed based on a patient's prescription information (Box 20). A container of the proper size is dispensed at a container dispensing station (Box 22), then grasped and moved to a labeling station (Box 24). The labeling station applies a label (Box 26), after which the container is transferred to a transport system and moved to a tablet dispensing station (Box 28), from which the designated tablets are dispensed in the designated amount into the container (Box 30). The filled container is then grasped again and moved to a closure dispensing station (Box 32), where a closure of the proper size has been dispensed (Box 34). The filled container is secured with a closure (Box 36), then transported to an offload station and offloaded (Box 38).
A system that can carry out this process is illustrated in FIGS. 2-37 and designated broadly therein at 40. Referring first to FIGS. 2 and 3, the system 40 includes a support frame 44 for the mounting of its various components. The illustrated support frame 40 includes a base 46 that rests on an underlying surface. Four uprights 48 extend vertically from the base 46 and define an internal cavity 45 within which the operable components of the system 40 generally reside. A pair of top rails 50 are attached to the upper ends of the uprights 48, and two cross-members 52 span the distance between the front and rear ends of the top rails 50. Top, intermediate and bottom arches 54, 55, 56 are mounted to extend from the front surfaces of the front uprights 48. The frame 44 also includes two lower rails 51 that extend between pairs of uprights 48 well below the top rails 52, and further includes a pair of intermediate rails 53 that are mounted in vertical alignment between two uprights 48 below one of the top rails 52.
Those skilled in this art will recognize that the frame 40 illustrated herein is exemplary and can take many configurations that would be suitable for use with the present invention. The frame 40 provides a strong, rigid foundation to which other components can be attached at desired locations, and other frame forms able to serve this purpose may also be acceptable for use with this invention.
Referring again to FIGS. 2 and 3, the system 40 generally includes as operative stations a controller 42, a container dispensing station 58, a labeling station 60, a tablet dispensing station 62, a closure dispensing station 64, and an offloading station 66. Containers, tablets and closures are moved between these stations with two different conveying devices: a labeling carrier 68 and a dispensing carrier 70. Each of the operative stations and the conveying devices is described in detail below.
The controller 42, which is mounted to and below the top arch 54, controls the operation of remainder of the system 40. In some embodiments, the controller 42 will be operatively connected with an external device, such as a personal or mainframe computer, that provides input information regarding prescriptions. In other embodiments, the controller 42 may be a stand-alone computer that directly receives manual input from a pharmacist or other operator. An exemplary controller is a conventional microprocessor-based personal computer.
Referring now to FIGS. 4-6, the container dispensing station 58, which is mounted to the bottom arch 56, comprises a plurality of tubes 80 oriented generally vertically and about a common axis of rotation. In the illustrated embodiment, three sets of tubes 80 of different sizes are illustrated; the ensuing discussion is equally applicable to each.
A bottom plate 82 is fixed to the bottom ends of the tubes 80 and a top plate 84 fixed to the top ends of the tubes 80. Each of the bottom and top plates 82, 84 have apertures that correspond to the ends of the tubes 80. The tubes 80 and bottom and top plates 82, 84 are free to rotate as a unit about the axis of rotation A1 and are driven by a motor or other rotary drive unit attached to the bottom plate 82 (the motor is not shown). A sorting plate 86 or other member is fixed to the lower arch 56 below and parallel to the bottom plate 82. The sorting plate 86 includes a slotted opening 87 at one edge. As is shown in FIGS. 5 and 5, a cup 88 or other receiving member is pivotally attached to lower surface of the sorting plate 86 such that it may move between a receiving position below the opening 87 (FIG. 5) and a donating position beyond the perimeter of the sorting plate 86 (FIG. 4) (pivoting of the cup 88 is controlled by the controller 42 through a second motor (not shown)).
Prior to operation, the tubes 80 within each set are filled with containers of similar size, with each set of tubes 80 housing containers of different sizes. Filling can be carried out by loading the containers in a preferred orientation through an orientation tube 84a (see FIG. 2), which has an opening 85a with a downward extending finger 86a that ensure that the containers are loaded with their open ends facing upwardly. The containers travel through the orientation tube 84 through the openings in the top plate 84 in an upright orientation with their open ends facing upwardly, so that they are vertically stacked within the tubes 80. In some embodiments, each set of tubes 80 is filled with different sizes of containers, while in other embodiments, individual tubes 80 within the same set of tubes may be filled with different sizes of containers.
In operation, the controller 42 signals the container dispensing station 58 that a container of a specified size is desired. The bottom and top plates 82, 84 rotate until a tube 80 that houses a container is positioned above the opening 87. At this point, the cup 88 is in its receiving position beneath the opening 87 (FIG. 5). The lowermost container drops downwardly through the opening 87 and into the cup 88. The controller 42 then signals the cup 88 to pivot to its donating position (FIGS. 4 and 6), wherein the container can be grasped by the labeling carrier 68. The cup 88 includes a support finger 89 trailing the receptacle portion of the cup 88 to support containers remaining in the tubes 80 when the cup 88 is in the donating position.
Those skilled in this art will appreciate that other container dispensing apparatus may be employed with the present invention. For example, the containers may be presented for grasping in a horizontal disposition, or the dispensing apparatus may include a conveyor unit that presents the containers one at a time for grasping. The skilled artisan will recognize additional embodiments that would be suitable for use with the inventive system.
From the container dispensing station 58, the container is moved to the labeling station 60; this movement is carried out by the labeling carrier 68 (see FIGS. 3 and 7-12). The labeling carrier 68 comprises an upright support member 91 fixed to the base of the frame 40, a carriage 92 attached to and moveable vertically on the support member 91, a swing arm 94 attached thereto that pivots about a vertical axis A2, and a gripping unit 96 attached to the free end of the swing arm 94. Both the vertical movement of the carriage 92 and the pivoting of the swing arm 94 and gripping unit 96 can be induced with conventional robotic techniques that need not be described in detail herein.
The gripping unit 96 has a body portion 98, a base 102 rotatably attached to the body portion 98 for rotation about an axis A3, a clutch mechanism 101 attached to the body portion 98 and coupled to the base 102, a plurality of fingers 104 (three are illustrated herein) that are rotatable and eccentrically mounted to the base 102 and extend downwardly therefrom generally parallel to each other, and a motor 100 attached to the body portion 98 and coupled to the fingers 104. Each finger 104 is fixed to a finger shaft 105, which in turn is fixed to a planet gear 106 such that, as the planet gear 106 rotates, so must the attached finger 104. Each planet gear 106 is attached to the base 102 in such a way as to be able to rotate freely relative thereto. A sun gear 107 is rotatably mounted onto the base 102 and can freely rotate in relation thereto about the axis A3. Each planet gear 106 engages the sun gear 107, so that when the sun gear 107 rotates in relation to the base 102, the planet gears 106 also rotate relative to the base 102 about a respective axis A4, A5, A6. A motor shaft 108 is fixed to the sun gear 107 along the axis A3 and is coupled to the motor 100 via a motor gear train 109.
Each finger 104 has an arcuate outer surface 104a that defines a portion of a circle, such that, when all of the fingers 104 are rotated to a radially inward position (FIGS. 7 and 10), the outer surfaces 104a of the fingers 104 form a stepped vertical cylinder, with their vertices 104b adjacent to one another. The fingers 104 can be rotated about their eccentric axes of rotation A4, A5, A6 (FIG. 11) so that their vertices 104b move radially outwardly from each other; rotation in this manner expands the circle defined by the radially outwardmost portions of the outer surfaces 104a of the fingers 104 (see FIGS. 8, 9 and 12). In operation, after the container of the desired size has been dispensed in one of the cups 88 as discussed above, the controller 42 signals the labeling carrier 68 to grasp the container. The carriage 92 slides on the support member 91, thereby moving the swing arm 94 to a height such that the lower ends of the fingers 104 are above the upper edge of the container. Also, the swing arm 94 pivots relative to the carriage 92 such that the fingers 104 are positioned directly over the container. At this point, the fingers 104 are rotated radially inwardly (FIGS. 7 and 10) to a retracted position. The carriage 92 then descends, which action lowers the fingers 104 into the cavity of the container. The motor 100 then exerts a torque on the sun gear 107 via the motor gear train 109 and the motor shaft 108, thereby causing the sun gear 107 to exert a torque on the planet gears 106 and a torque on the base 102 (via the planet gears 106 and finger shafts 105). Because the clutch 101 restrains the base 102 from rotating (via a pulley 101a and a belt 101b), the planet gears 106 rotate about axes A4, A5, A6 in response to this torque, causing the fingers 104 to turn and expand radially outward (see FIGS. 8 and 11) until they contact the inside surface of the container (see FIGS. 9 and 12). At this point, the container wall resists further expansion of the fingers 104, thereby inducing an opposing torque on the base 102 transmitted via the fingers 104, finger shafts 105, and planet gears 106. Once this opposing torque exceeds the breaking torque of the clutch 101, the base 102 and container—now held by the fingers 104—rotates about the axis A3. The clutch 101 continues to exert a restraining torque on the base 102 as the base 102 rotates. The fingers 104 continue to exert pressure on the inside of the container (as explained above) as the base 102 rotates, thereby inducing the container to rotate and enabling the fingers 104 to lift the container from the cup 88. The controller 42 signals the carriage 92 to rise on the support member 91. As this occurs, the fingers 104 lift and carry the container from the cup 88, and the container continues to rotate relative to the body portion 98 due to the rotation of the base 102.
Other techniques for grasping and moving the container from the container dispensing station 58 will be apparent to those skilled in this art. For example, the gripping fingers may take a different configuration (e.g., they may not form a cylinder when rotated inwardly). As another example, gripping fingers may be used that grip the outer surface of the container. Alternatively, suction may be employed to temporarily grasp and move the container.
Once the labeling carrier 68 has retrieved the container from the cup 88, it carries the container to the labeling station 60 (see FIGS. 3 and 13-16). The labeling station 60 includes a printer 110 that is controlled by the controller 42. The printer 110, which is mounted to one side of the base 46, prints and presents an adhesive label that is to be affixed to the container. The labeling station 60 also includes a wiping device, such as the brush 112 illustrated in FIG. 8, that is positioned adjacent to the exit port 114 of the printer 110.
Returning to the operation of the system 40, once the container has been grasped and is being rotated by the labeling carrier 68, it is moved (under the direction of the controller 42) to the exit port 114 of the printer 110 through appropriate translation of the carriage 92 on the support member 91 and pivoting of the swing arm 94 relative to the carriage 92 (FIG. 13). Once the printed label has exited the exit port 114, the labeling carrier 68 presents the rotating container to the label (FIG. 13); the rotation of the container enables the wiping device to smoothly apply the label to the container (augmented by the brush 112—see FIGS. 14-16).
Those skilled in this art will appreciate that other structures and components for affixing a printed label to a container may also be employed with the present invention. For example, the container may be transferred to pinch rollers located at the exit port 114.
After the container has been labeled, the labeling carrier 68 moves to a transfer position (through appropriate movements of the carriage 92, swing arm 94, and body portion 98, as directed by the controller 42) and transfers the labeled container to the dispensing carrier 70 (FIGS. 3, 17 and 18). The dispensing carrier 70 includes an upper carriage 120 that slides upon a rail 122 extending between the cross-members 52, a rail 124 that extends downwardly from the carriage 120, a lower carriage 126 that slides vertically along the rail 124, and a grip unit 128 that is mounted on the lower carriage 126 via horizontally disposed circular tracks 130 that revolve around the lower carriage 126. The grip unit 128 includes a traveler unit 132 that is mounted to the tracks 130, an axle 134 that is rotatably mounted in and extends from the traveler unit 132, and a gripping mechanism 136 that is attached to and is rotatable with the axle 134. The gripping mechanism 136 has two jaws 138 that can confront each other and exert clamping force on an object (such as a container of the type discussed herein). Notably, the jaws 138 have a curved portion 139 that assists in gripping the cylindrical container. Also, the jaws 138 may be configured such that they compress the container only to a desired torque level (e.g. with a clutch mechanism, or with a sensor that detects a predetermined current level for the drive motor) in order to prevent crushing of the container, or such that they compress only to predetermined positions selected to match the sizes of the different containers used with the system 40.
The dispensing carrier 70 has the capability of moving the gripping mechanism 136 (and, in turn, an object grasped therein) to designated locations within the cavity 45 of the frame 44. Movement from end to end within the cavity 45 (i.e., toward and away from the arches 54, 55, 56) is accomplished by inducing movement of the upper carriage 120 on the rail 122. Vertical movement is accomplished by inducing movement of the lower carriage 126 on the rail 124. The grip unit 128 may also revolve around the rail 124 about an axis A7 through revolution of the tracks 130 around the carriage 126. The gripping mechanism 136 may rotate relative to the traveler unit 132 about an axis A8 defined by the axle 134. Induction and control of these movements may be achieved through conventional robotic techniques that need not be described in detail herein. The skilled artisan will also appreciate that other components for grasping and maneuvering a container may also be employed with the present invention.
Returning to operation of the system 40, transfer of the labeled container from the labeling carrier 68 to the dispensing carrier 70 is achieved by the controller 42 directing the dispensing carrier 70 to move the gripping mechanism 136 to a position in which the jaws 138 can clamp onto the outer surface of the container as it is presented by the labeling carrier 68. Preferably, the position for transfer is proximate to the printer 110 and the tablet dispensing station 62. The controller 42 first signals the dispensing carrier 70 to close the jaws 138 onto the outer surface of the container, then directs the labeling carrier 68 to retract the fingers 104 to their radially inward positions so that the container is held only by the jaws 138. The fingers 104 are then withdrawn from the container (through either upward movement of the fingers 104 by the labeling carrier 68 or downward movement of the labeled container by the dispensing container 70), and the labeled container is ready to be filled with tablets.
Filling of labeled containers with tablets is carried out by the tablet dispensing station 62 (see FIGS. 2 and 19-29). The tablet dispensing station 62 comprises a plurality of tablet dispensing bins 150, each of which holds a bulk supply of individual tablets (typically the bins 150 will hold different tablets). The dispensing bins 150, which are typically substantially identical in size and configuration, are organized in an array mounted on the intermediate rails 53 of the frame 44, and each has a dispensing channel 154 with an outlet that faces generally in the same direction, to create an access region for the dispensing carrier 70. The identity of the tablets in each bins is known by the controller 42, which can direct the dispensing carrier 70 to transport the container to the proper bin 150. In some embodiments, the bins 150 may be labeled with a bar code or other indicia to allow the dispensing carrier 70 to confirm that it has arrived at the proper bin 150.
The dispensing bins 150 are configured to singulate, count, and dispense the tablets contained therein, with the operation of the bins 150 and the counting of the tablets being controlled by the controller 42. Some embodiments may employ the controller 42 as the device which monitors the locations and contents of the bins 150; others may employ the controller 42 to monitor the locations of the bins, with the bins 150 including indicia (such as a bar code or electronic transmitter) to identify the contents to the controller 42; in still other embodiments the bins 150 may generate and provide location and content information to the controller 42, with the result that the bins 150 may be moved to different positions on the frame 42 without the need for manual modification of the controller 42 (i.e. the bins 150 will update the controller 42 automatically).
Any of a number of dispensing units that singulate and count discrete objects may be employed; however, dispensing units that rely upon targeted air flow and a singulating nozzle assembly, such as the devices described in co-pending U.S. patent application Ser. No. 09/934,940, filed Aug. 22, 2001 and entitled DEVICE TO COUNT AND DISPENSE ARTICLES and in U.S. Provisional Application No. 60/306,782, filed Jul. 20, 2001 for DEVICE TO COUNT AND DISPENSE ARTICLES, are preferred (these applications are hereby incorporated herein by reference in their entireties). Bins of this variety may also include additional features, such as those described below.
Referring now to FIGS. 19 and 23-29, the bins 150 can be described generally as having a tablet-filled hopper 153 through which air flows and agitates the tablets contained therein, and the aforementioned dispensing channel 154 through which the tablets are dispensed one at a time. Suction can be applied to the channel 154 through a forwardly-directed jet 155; a rearwardly-directed jet 156 is also included that can reverse the motion of tablets within the channel 154. The jets 155, 156 are controlled by the controller 42, which initiates forward air flow in response to a customer order and activates rearward air flow in response to the passage of a certain quantity of tablets through in the dispensing channel 154 (as detected by a counting sensor 154a located in the dispensing channel 154). Alternatively, the jets 155, 156 may be controlled by a local controller unique to each bin 150 (as described in some detail below). The bins 150 can filled or replenished with tablets via access from a pivoting door 180 located at the upper rear portion of the bin 150. Notably, the location of the door 180 opposite the outlet of the dispensing channel 154 enables an operator to replenish the bin 150 without disconnecting it from the frame 44 or interfering with the dispensing from this or another bin 150. Also, the pivoting of the lower end portion of the door 180 and the inclusion of side walls 180a causes an open door 180 to form a funnel-like configuration, which configuration can facilitate pouring of pharmaceuticals into the bin 150.
Referring now to FIGS. 20A through 22, the bins 150 may include components that permit the entry to the dispensing channel 154 to be adjusted in size to complement the size and configuration of the tablet to be dispensed. This can be achieved through a stationary wall 160, a moveable wall 161, a moveable ceiling 162 and a moveable floor 163 that form the entry to (and in some instances the perimeter of) the dispensing channel 154. In the illustrated embodiment, the stationary wall 160 is a portion 151a of the housing 151 of the bin 150. The stationary wall 160 also forms a portion of a recess 301 that extends inwardly into the housing 151. The ceiling 162 is part of a ceiling unit 302 that fits within the recess 301. The ceiling unit 302 also includes a vertical panel 304 extends downwardly from a lateral edge of the ceiling 162. The vertical panel 304 includes two apertures and an engagement projection 306 that engages a slot in a wall of the recess 301. Also, an adjustment knob 320 and attached threaded shank 322 insert through a threaded nut 324 attached to the vertical panel 304; the knob 320 is held in place within a recess in the housing 151. The moveable wall 161 is part of a moveable wall unit 308 that includes front and rear panels 310, 312 that extend transversely from front and rear portions of the moveable wall 161. Two posts 314 extend from the moveable wall 161 and pass through the apertures of the vertical panel 304 of the ceiling unit 302 into elongated slots 316 of the housing. A front projection 318 extends beyond the front panel 310 and is received in a slot 319 in the housing. The moveable floor 163 is part of a floor unit 326 that also includes a front portion 328 with a slot 330 that receives the front projection 318 of the moveable wall 161, gussets 331, 332, 333 that help to guide the moveable wall 161, and an adjustment knob 334 and an attached threaded shank 336 that extend into and through an attached nut 338. The adjustment knob 334 is maintained in place within a slot 340 in the housing of the bin 150, and the floor 163 is maintained in vertical position by two tines 342. Two springs 344 surround the posts 314 between the moveable wall 161 and the vertical panel 304.
In addition, the floor 163 includes a series of apertures 349 located to the side of the dispensing channel 154. These apertures 349 can provide additional flow to this region of the bin 150. The additional flow can encourage tablets that tumble to a position adjacent the dispensing channel 154 during agitation to rejoin the remaining tablets; otherwise, they may remain in this “dead” area, which can tend to clog entry into the dispensing channel 154.
To adjust the width of the dispensing channel 154 (FIG. 22), the adjustment knob 334 is rotated about its axis. Rotation of the shank 336 within the nut 338 induces the floor 163 to slide horizontally between the housing 151 and the tines 342. In doing so, the posts 314 are free to slide through the apertures in the vertical panel 304; the moveable wall 161 is maintained in contact with the floor 163 by compression from the springs 344. In the illustrated embodiment, the exact position of the moveable wall 161 can be monitored with markings 346 located on the rear portion of the floor 163.
To adjust the height of the ceiling 162 (FIG. 21), the adjustment knob 320 is rotated. Interaction between the shank 322 and the nut 324 causes the ceiling unit 302 to slide within the recess 301. The posts 314 slide within the slots 316 in the housing 151, and the moveable wall 161 is driven upwardly or downwardly by the ceiling 162. The front projection 318 of the moveable wall 161 remains in the slots 319, 330. The exact position of the ceiling 162 can be monitored with markings 348 located on the side of the housing 151.
Notably, the configuration of the dispensing channel 154 described above can provide an essentially “gapless” channel for the tablets to travel in, which can improve performance of the system 40. Also, the floor 163 and the stationary wall 160 of the dispensing channel 154 remain in place, which provides a constant location to which the container receiving tablets can be delivered.
A further optional feature of the illustrated dispensing channel 154 is a splash guard 158 (FIG. 28), which is located at the outlet of the dispensing channel 154. The splash guard 158 can reduce or eliminate the risk that a tablet traveling to the container falls or bounces outside the container. In one embodiment, the splash guard 158 is formed of a spongy foam material (such as polyethylene foam); such a material enables the container to be compressed against the splash guard 158, causing it to deform around the upper edge of the container and seal it so that tablets do not stray from the container. With a splash guard of this construction, the presentation of the container to the dispensing channel 154 by the dispensing carrier 70 can occur with a larger margin for error in positioning.
Another feature of the tablet dispensing station 62 that may be included with the present invention is illustrated in FIGS. 3 and 23-25. As can be seen therein, a low pressure manifold 170 having a number of inlets 171 is mounted to the frame 44 and extends horizontally; the manifold 170, which is fluidly connected to a low pressure source such as a vacuum motor (not shown), provides low level (i.e., about 2 psi) suction to the bin 150 to either (a) maintain a door 172 in a closed position when the particular bin 150 is not in use or (b) agitate tablets within the bin when the door 172 is opened by a solenoid 173 or other actuating unit within the bin 150. Of course, individual blowers may be used for each bin in lieu of the manifold 170 with multiple inlets 171. Also, a high pressure (i.e., about 30 psi) conduit 175 with a fitting 176 also extends horizontally from its mounting point on the frame 44, with the fitting 176 projecting toward the bin 150. The fitting 176 may be a check valve, so that high pressure air is not expelled if the bin 150 is not present. The high pressure conduit 175 is fluidly connected to a high pressure source (not shown). Further, a connector circuit board 177 is mounted horizontally below the manifold 170; the circuit board 177 or other electrical connector provides an electrical connection between the controller 42 and the bin-controlling circuit board 177a (or other electronic component) of the bin 150 for power and data signals from the controller 42, such as those that control the opening and closing of the door 172, the application of suction and/or positive pressure through the conduit 175, and the counting sensor 154a. Thus, all three of these connections should be made for the bin 150 to operate.
Despite the presence of the hopper door 180 through which the hopper 153 can be refilled, there are instances for which it would be desirable to remove the bin 150 from the frame 44 (for example, to adjust the size of the entry to the dispensing channel 154). When the bin 150 has been removed, reinstallation requires that connections be re-established between the bin 150 and the manifold 170, the conduit 175, and the connector circuit board 177.
The frame 44 illustrated herein includes prongs 183 (FIG. 23) that facilitate re-establishment of the aforementioned connections. The prongs 183 are positioned below the manifold 170 and are configured for slidable movement with slots 184 on the housing 151 that receives the prongs 183. The prongs 183 include recesses 183a that receive pins 187 located on a pivoting member 189. As the prongs 183 slide to completely fill the slots 184, an opening 172b of the housing 151 aligns with an inlet 171 of the manifold 170, the bin-controlling circuit board 177a located on the front edge of the hopper 153 comes into contact with the connector circuit board 177, and a fitting 188 that extends from the front of the housing 151 below the bin-controlling circuit board 177a locks with the fitting 176 of the conduit 175. As such, simply sliding the bin 150 back into place (FIGS. 23 and 24) can re-establish all of these operative connections without additional steps. The bin 150 can be secured firmly into place by pivoting the member 189 so that the posts 187 fill the slots 183a (FIGS. 24 and 25).
Referring now to FIG. 23A, the connector board 177 is mounted to the frame 44 and supports electronic circuitry which contains a “location identifier” unique to the physical location of the connector board 177 on the frame 44. The connector board 177 provides its mating bin-controlling circuit board 177a with regulated and unregulated power, a physical connection to the data bus 177b, and the location identifier for the connector board 177. The connector board 177 communicates power and data to the bin-controlling circuit board 177a via the bus 177b (which is a power and data bus).
Still referring to FIG. 23A, the bin-controlling circuit board 177a contains a “bin identifier” unique to that bin that can be read by the controller 42. The bin-controlling circuit board 177a processes counting and dispensing functions such as triggering the solenoid 173, triggering the air valves 190, and processing signals from the sensor 154a. The bin-controlling circuit board 177a can receive dispense instructions and communicate its unique identifier and other information relative to its counting function, such as count status, empty condition, and the like. In some embodiments the bin-controlling circuit board 177a may also send or receive data such as inventory levels or sensor condition. Upon command from the controller 42 the bin controlling circuit board 177a can initiate and control the dispense and count process.
With this configuration, the controller 42 can search for a unique bin identifier and associate it with a certain location identifier. The controller 42 may then direct the dispensing carrier 70 to carry the container to the appropriate position for dispensing. Thus, once a pharmaceutical has been associated with a particular bin 150 via its “bin identifier”, accurate dispensing of the pharmaceutical becomes independent of a priori knowledge of the pharmaceutical's physical location on the frame 44. This gives the user the ability to quickly re-arrange the bin locations according to changing requirements such as alphabetization or utilization ranking.
Referring now to FIG. 23B, in other embodiments of the system 42, each bin 150 may contain an additional machine readable identifier 150a which is more readily accessible to an operator wielding a reader 150b which is connected to the controller 42. Using this reader 150b, the operator may select and read the bin identifier 150a to automatically associate various external data such as pharmaceutical identifiers, replenishment quantities, etc., to the bins' information set. This identifier 150a may be placed on the inside of the replenishment door 180 so that the door 180 must be opened before the reader can access the identifier 150a. 
To fill the container, the dispensing carrier 70, directed by the controller 42, moves the container to the exit port of the selected dispensing bin 150. The controller 42 signals the solenoid 173 to open the door 172 (more specifically, the solenoid 173 retracts, and a plunger 173a moves toward the door 172, striking a finger 172a located on the top portion of the door 172 and causing it to pivot open—see FIG. 27). This opening of the door 172 draws low pressure air up through the hopper 153 from a screen 153a on the bottom of the hopper 153, through another screen 153b on the top portion of the hopper 153, and to the opening 172b, thereby agitating the tablets contained in the hopper 153 (FIG. 27). Once agitation has commenced, the controller 42 signals a valve 190a connected with the forwardly-directed jets to open, which causes high pressure air to be drawn outwardly through the dispensing channel 154 (FIG. 28). Tablets are oriented into a preferred orientation by the shape of the entry to the dispensing channel 154 and dispensed into the container through the dispensing channel 154. The counting sensor 154a counts the tablets as they pass through a predetermined point in the dispensing channel 154. Once dispensing is complete (i.e., a predetermined number of tablets has been dispensed), the controller 42 activates the valve 190b associated with the rearwardly-directed jet 56 and deactivates the dispensing bin 150, the solenoid 173 deactivates, thereby closing the door 172 (FIG. 29), and the dispensing carrier 70 moves the filled container to the closure dispensing station 64.
Referring now to FIGS. 30-37, the closure dispensing station 64 includes two closure dispensers 200 and two closure holders 202, each of which is mounted to the intermediate arch 55 of the frame 44 between the container dispensing station 58 and the labeling station 60. Typically, each closure dispenser 200 and closure holder 202 contains and manipulates a single size of closure. The closure dispensers 200 house a bulk supply of closures and dispense them, in a preferred orientation, one at a time to a respective closure holder 202, where they are secured onto a filled container. One each of a closure dispenser 200 and a closure holder 202 are described in detail below; those skilled in this art will appreciate that any number of closure dispensers and closure holders may be employed with the present invention.
The closure dispenser 200 (FIGS. 30-34) includes an open-ended bin 204 that feeds a rotatable hopper 206. The hopper 206 has an open top end to receive closures from the bin 204 and a circumferential groove 208 at its lower end that surrounds a central circular island 209. The groove 208 has a depth that is approximately the diameter of a closure and a width that is approximately the width of the closure. A circumferential protrusion 210 juts radially inwardly from the wall 207 of the hopper 206 above the groove 208 and island 209. The sizes and configurations of the groove 208, island 209 and protrusion 210 are such that a closure (which is a flat, open-ended cylinder) can enter the groove 208 from above only when the closure is oriented so that the open end of the closure faces the island 209. This occurs because the open end of the closure can receive a portion of the edge of the island 209, thereby allowing the closure to be positioned slightly farther from the wall 207 (and, therefore, slide into the groove 208) than a closure oriented with the closed end facing the island 209, which cannot pass between the island 209 and the protrusion 210 in this manner (compare FIGS. 32 and 33).
The floor 211 of the hopper 206 has an opening 213 through which one closure can pass. The floor 211 abuts a plate 214 (FIG. 34) that also includes at least one opening 212 that has a length in a direction substantially tangent to the groove 208 that is sufficient to pass one closure. The hopper 206 is rotatably mounted on the plate 214. A channel 218 is positioned below the opening 212 and leads to the closure holder 202; the channel 218 is sized such that the closure substantially maintains the orientation it takes upon exiting the opening 212.
Closures are dispensed by filling the bin with closures and rotating the hopper 206 relative to the plate 214. As the hopper 206 rotates, each closure tumbles until it eventually reaches the desired orientation and slides into the groove 208 (tumbling of the closures is augmented by two agitating projections 209a). As the hopper 206 continues to rotate, the closure eventually reaches the opening 213, at which point it passes through the opening 212 and falls into the channel 218. The channel 218 conveys the closure in its desired orientation to the closure holder 202.
Those skilled in this art will appreciate that other techniques for separating and orienting closures may also be employed. For example, a conventional “pick-and-place” device may be used. Additional sensors and controllers may also be used.
Referring now to FIG. 35, the closure holder 202 includes a vertical mounting post 222 upon which are mounted a container receiving stage 224 and a closure holding stage 226. The container receiving stage 226 comprises a block 228 that is slidable relative to the mounting post 222 driven by a rack-and-pinion drive unit 227. A platform 230 extends generally horizontally away from the block 228. Two open-ended cups 232a, 232b sized to receive filled containers are mounted on the upper surface of the platform 230. A rotatable drive wheel 233 or other rotary drive unit is positioned between the cups 232a, 232b that rotates the cups 232a, 232b about their respective longitudinal axes; rotation of the drive wheel 233 is controlled by the controller 42.
Referring still to FIG. 35, the closure holding stage 226 has a ceiling 234 and three downwardly-extending walls 236 that form two closure securing compartments 238. A fork 239 is mounted to the mounting post 222 and forms the rear wall of the securing compartments 238; the fork 239 includes openings that receive closures from the channels 218. A pair of ledges 240a, 240b extend into each compartment 238 from the opposing surfaces of the walls 236. The ledges 240a, 240b extend a sufficient distance from the walls 236 that a closure cannot pass downwardly between the ledges 240a, 240b, but a container can pass upwardly between them. The ledges 240a, 240b, walls 236 and ceiling 234 are also configured so that a closure can pass forwardly (i.e., away from the fork 239) to allow a combined container and closure to pass out of the compartments 238.
Returning to the operation of the system 40, after the container is filled with tablets at the tablet dispensing station 62, the dispensing carrier 70 grasps the filled container, conveys it to the closure dispensing station 64, and places it in a selected cup 232a, 232b as directed by the controller 42 (FIG. 35). The block 228 slides upwardly relative to the mounting post 222, thereby moving the platform 230 upwardly. The platform 230 ascends, and the upper end of the container contacts and intercepts the closure positioned in the compartment 238. The container and closure continue to rise until the container compresses the closure against the ceiling 234 (FIG. 36). The selected cup 232a then rotates, thereby rotating the container, as the ceiling 234 holds the closure in place, causing the container to rotate relative to the closure. This rotation secures the closure to the container. The platform 230 then lowers; the closed container descends until the closure contacts the ledges 240a, 240b, with the closed container dangling therefrom (FIG. 37). The dispensing carrier 70 then moves to the closed container, grasps it, and moves it to the offloading station 66.
Referring now to FIG. 2, the offloading station 66 includes a plurality of compartments 250 positioned between the intermediate and upper arches 55, 54. These can be organized in any manner desired by the operator; for example, they may be organized by customer name, time of dispensing, contents of the container, or any other scheme. The dispensing carrier 70 conveys the closed container to the compartment directed by the controller 42 and releases it there. The dispensing carrier is then free to grasp another labeled container at the labeling station 60 and perform its operations again.
The foregoing is illustrative of the present invention, and is not to be construed as limiting thereof. Although exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. As such, all such modifications are intended to be included within the scope of this invention. The scope of the invention is to be defined by the following claims.

## Claims

1. An apparatus for transporting a workpiece within a three-dimensional volume, comprising:
a first rail extending in a generally horizontal direction;
a first carriage that is slidably connected to the first rail for movement in the horizontal direction;
a second rail attached to the first carriage and extending in a generally vertical direction;
a second carriage that is slidably connected to the second rail for movement in the vertical direction;
a traveler unit mounted to and revolvable along a generally horizontal annular path about the second carriage; and
a gripper unit mounted to the traveler unit configured to grip the workpiece, the gripper unit including a pair of opposed jaws;
wherein the traveler unit is revolvable relative to the second carriage; and
wherein the gripper unit includes a clutch mechanism that ceases inward movement of the jaws after a predetermined magnitude of compression exerted by the jaws on a workpiece is reached.

2. The apparatus defined in claim 1, wherein the gripper unit is configured to rotate about a generally horizontal axis.

3. The apparatus defined in claim 1, wherein the gripper unit includes a pair of opposed jaws, one of the jaws being movable toward the other of the jaws to grip workpieces of different sizes.

4. The apparatus defined in claim 3, wherein each of the jaws includes a curved portion.

5. An apparatus for transporting a workpiece within a three-dimensional volume, comprising:
a first rail extending in a generally horizontal direction;
a first carriage that is slidably connected to the first rail for movement in the horizontal direction;
a second rail attached to the first carriage and extending in a generally vertical direction;
a second carriage that is slidably connected to the second rail for movement in the vertical direction;
a traveler unit mounted to and revolvable along a generally horizontal annular path about the second carriage; and
a gripper unit mounted to the traveler unit configured to grip the workpiece;
wherein the gripper unit includes a pair of opposed jaws, one of the jaws being movable toward the other of the jaws to grip workpieces of different sizes, and
wherein the gripper unit is rotatable about a horizontal axis and is mounted on the traveler unit such that the horizontal axis is generally in a plane defined by the jaws and perpendicular to the direction of movement of the movable jaw.

6. The apparatus defined in claim 5, wherein each of the jaws includes a curved portion.

7. The apparatus defined in claim 5, wherein the gripper unit includes a clutch mechanism that ceases inward movement of the jaws after a predetermined magnitude of compression exerted by the jaws on a workpiece is reached.

8. An apparatus for transporting a workpiece within a three-dimensional volume, comprising:
a first rail extending in a generally horizontal direction;
a first carriage that is connected to the first rail for movement in the horizontal direction;
a second rail attached to the first carriage and extending in a generally vertical direction;
a second carriage that is connected to the second rail for movement in the vertical direction;
a traveler unit mounted to and revolvable along a generally horizontal annular path about the second carriage; and
a gripper unit mounted to the traveler unit configured to grip the workpiece, the gripper unit including a pair of opposed jaws;
wherein the traveler unit is revolvable relative to the second carriage; and
wherein the gripper unit includes a mechanism that ceases inward movement of the jaws after a predetermined magnitude of compression exerted by the jaws on a workpiece is reached.

9. The apparatus defined in claim 8, wherein the gripper unit is configured to rotate about a generally horizontal axis.

10. The apparatus defined in claim 8, wherein the gripper unit includes a pair of opposed jaws, one of the jaws being movable toward the other of the jaws to grip workpieces of different sizes.

11. The apparatus defined in claim 10, wherein each of the jaws includes a curved portion.

12. An apparatus for transporting a workpiece within a three-dimensional volume, comprising:
a first rail extending in a generally horizontal direction;
a first carriage that is connected to the first rail for movement in the horizontal direction;
a second rail attached to the first carriage and extending in a generally vertical direction;
a second carriage that is connected to the second rail for movement in the vertical direction;
a traveler unit mounted to and revolvable along a generally horizontal annular path about the second carriage; and
a gripper unit mounted to the traveler unit configured to grip the workpiece;
wherein the gripper unit includes a pair of opposed jaws, one of the jaws being movable toward the other of the jaws to grip workpieces of different sizes, and
wherein the gripper unit is rotatable about a horizontal axis and is mounted on the traveler unit such that the horizontal axis is generally in a plane defined by the jaws and perpendicular to the direction of movement of the movable jaw.

13. The apparatus defined in claim 12, wherein each of the jaws includes a curved portion.

14. The apparatus defined in claim 12, wherein the gripper unit includes a clutch mechanism that ceases inward movement of the jaws after a predetermined magnitude of compression exerted by the jaws on a workpiece is reached.