Apparatus for high-speed accurate counting and handling of discrete objects such as tablets

• US 4,066,173 A
• Filed: 11/17/1975
• Issued: 01/03/1978
• Est. Priority Date: 03/21/1974
• Status: Expired due to Term

• Current Assignee: Hoffmann-La Roche Incorporated (Roche Holding AG)
• Original Assignee: Hoffmann-La Roche Incorporated (Roche Holding AG)
• Inventors: DEZabala, Edward Francis, Adams, Jim Mills
• Primary Examiner(s): Werner, Frank E.
• Application Number:
  US05/632,438
• Time in Patent Office: 778 Days
• Field of Search: 214/1 C, 221/2, 221/7, 53/59 R, 53/78, 15/303, 15/316 R, 15/339, 15/405, 425/135, 425/140, 425/141, 425/149, 235/92 V, 235/92 DN
• US Class Current: 414/675
• CPC Class Codes: B30B 11/005 Control arrangements
• CPC Class Codes: B30B 11/08 co-operating with moulds carried by a turntable
• CPC Class Codes: B30B 15/32 Discharging presses
• CPC Class Codes: G06M 3/02 for performing an operation at a predetermined value of the count, e.g. arresting a machine G06M3/04 takes precedence
• CPC Class Codes: G06M 7/00 Counting of objects carried by a conveyor

Abstract

There is disclosed a highly accurate counting and handling arrangement particularly adaptable to large-volume, high-speed multiple-output apparatus producing discrete, solid particular objects, such as tablets. Sensing means, preferably retroreflective optical sensors, fluidic sensors or strain-gauge sensing arrangements, are employed in associated with existing apparatus to detect each object at the point where the objects are substantially completely formed. The signals generated by the individual sensors are received by a control counter arrangement which provides a continuous separate displayed counting for each sensor employed. The control counter arrangement has provision for separately presetting the maximum desired count of sensed objects for each sensor employed. A gated dispensing assembly is additionally provided in association with each sensor employed which is adapted to predeterminably control the procession of the objects from their point of virtual completion to a pre-established destination under the supervision of the respective separate maximum preset facility of the control counter arrangement.

Claims

1. An ultra-accurate counting and handling system for use with high-speed press apparatus having a horizontally rotatable die table for making discrete, solid particular objects, comprising:

a. sensing means including a directional sensor arrangement predeterminably arranged relative to each station of the apparatus at which the formation of the objects is virtually completed, each said sensor arrangement including a retro-reflective sensor arranged to have an operative face thereof proximate the said respective station of the apparatus at a pre-established optimum sensing angle α

of between 18° and

30°

relative to the horizontal and which is aimed at a point of the said respective station whereat the objects are substantially fully ejected from their dies;

b. control counter means responsive to said sensing means for providing a continuous count of the objects sensed by each said sensor arrangement, said counter means including first means enabling a presetting of the maximum desired count of sensed objects for each said station of the apparatus;

c. gating and handling means including a gated dispensing arrangement associated with each said station of the apparatus and having a first portion thereof situate proximate the said respective station, each said gated dispensing arrangement being adapted to predeterminably control the procession of the objects from said respective station of the apparatus to a pre-established destination under the supervision of said first means.

2. The system according to claim 1 wherein there exists about the rotatable rotary die table a pair of said stations of the apparatus at which the objects are virtually fully ejected, and wherein there is associated with each a respective sensor and a respective gated dispensing arrangement.

3. An ultra-accurate counting and handling system for use with high-speed apparatus making discrete, solid particular objects comprising:

a. sensing means including a directional sensor arrangement predeterminably arranged relative to each station of the apparatus at which the formation of the objects is virtually completed, each said sensor arrangement including a retroreflective sensor arranged to have an operative face thereof proximate the said respective station of the apparatus at a pre-established optimum sensing angle α

relative to the virtually completed objects;

b. control counter means responsive to said sensing means for providing a continuous count of the objects sensed by each said sensor arrangement, said counter means including first means enabling a presetting of the maximum desired count of sensed objects for each said station of the apparatus;

c. gating and handling means including a gated dispensing arrangement associated with each said station of the apparatus and having a first portion thereof situate proximate the said respective station, each said gated dispensing arrangement being adapted to predeterminably control the procession of the objects from said respective station of the apparatus to a pre-established destination under the supervision of said first means;

d. said at least one sensor arrangement including purge means at least a portion of which is mounted to be in operative arrangement with the face of said retroreflective sensor for continuously purging said face of particle accumulations by way of a maintained pressure differential proximate said face.

4. The system according to claim 3 wherein said portion of said purge means about said face is a substantially cylindrically shaped apertured canopy upon said face and having predetermined dimensions relative to said sensor face, there being in communication with said canopy at least one narrow slot by way of which said pressure differential is introduced to said face for providing continuous flushing thereof to combat particle accumulation.

5. The system according to claim 4 wherein said purge means includes fluid source means in communication with said at least one narrow slot for providing a source of positively pressurized fluid to flush said sensor face.

6. The system according to claim 5 wherein said pressurized source of fluid is predeterminably controlled as to the volume and pressure of fluid supplied and said at least one slot is predeterminably arranged in said canopy and dimensioned relative to the maintained pressure of said fluid source, for providing a purging action within said canopy in the form of a substantially continuous and uniform positive pressure wave front emanating from the aperture of said canopy.

7. The system according to claim 6 wherein said at least one slot is formed in the side of said cylindrically shaped canopy and is arranged to direct a fluid stream from said source off of the side of said canopy opposite thereto so as to create an outwardly-directed substantially continuous and uniform wave front of fluid at the aperture of said cylindrical canopy.

8. An ultra-accurate counting and handling system for use with high-speed apparatus making discrete, solid particular objects comprising:

a. sensing means including a directional sensor arrangement predeterminably arranged relative to each station of the apparatus at which the formation of the objects is virtually completed, each said sensor arrangement including a retroreflective sensor arranged to have an operative face thereof proximate the said respective station of the apparatus at a pre-established optimum sensing angle α

relative to the virtually completed objects;

b. control counter means responsive to said sensing means for providing a continuous count of the objects sensed by each said sensor arrangement, said counter means including first means enabling a presetting of the maximum desired count of sensed objects for each said station of the apparatus;

c. gating and handling means including a gated dispensing arrangement associated with each said station of the apparatus and having a first portion thereof situate proximate the said respective station, each said gated dispensing arrangement being adapted to predeterminably control the procession of the objects from said respective station of the apparatus to a pre-established destination under the supervision of said first means;

d. said sensing means further including a spring-loaded mounting mechanism associated with each said sensing arrangement for housing the sensor and providing adjustable stationary mounting of the latter relative to said respective station of the apparatus; and

e. purge means assembled on at least one said mounting mechanism in operative arrangement with the face of the sensor arrangement associated therewith for continuously purging said face of particle accumulations by way of a predeterminably maintained pressure differential across said face.

9. The system according to claim 8 wherein said purge means is provided with control means for enabling said purging action to be nondisturbing with regard to the formation and sensing of the objects.

10. The system according to claim 8 further including excess particle control means arranged in front of said mounted purge means and sensor arrangement relative to the direction of movement of the objects at the said respective station of the apparatus, for providing a stationary barrier in conjunction with a continuously operating vacuum source situated behind said barrier in said direction of object movement to deter the movement of loose particles along the path of movement of the objects.

11. An ultra-accurate counting and handling system for use with high-speed apparatus making discrete, solid particular objects, comprising:

a. sensing means including a directional sensor arrangement predeterminably arranged relative to each station of the apparatus at which the formation of the objects is virtually completed, each said sensor arrangement having an optical face positioned proximate said station to which it is associated;

b. control counter means responsive to said sensing means for providing a separate continuous count of the objects sensed by each said sensor arrangement, said counter means including first means enabling a separate presetting of the maximum desired count of sensed objects for each said station of the apparatus; and

c. gating and handling means including a gated dispensing arrangement associated with each said station of the apparatus and having a first portion thereof situate proximate the said respective station, each said gated dispensing arrangement being adapted to predeterminably control the procession of the objects from said respective station of the apparatus to a pre-established destination under the supervision of said first means;

d. said gated dispensing arrangement including a gate assembly adapted to receive the objects from the said respective station of the apparatus, said gate assembly being comprised of guide means positioned for directing said completed tablets away from said station, a chute arrangement a first portion of which is arranged proximate said guide means to receive the objects from the latter, and a gate mechanism arranged relative to said chute arrangement for controllably directing the movement of the objects through said chute arrangement, each said gate assembly chute arrangement having at least two defined paths of movement for the objects;

e. said first means including gate actuation control means for causing, in response to an attainment of the preset count established in said first means for a station of the apparatus, each said gate mechanism to undergo a switching movement resulting in the objects being then diverted to an alternate one of said at least two paths of said chute arrangement; and

f. said gating and handling means further including a deduster assembly coupled to said gate assembly for receiving the objects as they emerge from one of the said defined paths of said gate assembly, said deduster assembly having means for maintaining the objects in the path associated with the movement thereof through said gate assembly while separating the objects from loose particles heretofore moving along with the objects.

12. The system according to claim 11 wherein said deduster assembly further includes vibrator means for providing movement of the objects through said deduster assembly as well as providing separation of loose particles from the objects.

13. The system according to claim 12 wherein said deduster assembly further includes a tubular structure in communication with said gate assembly and having a separator arrangement therein for preserving separate paths defined originally by said gate assembly, said tubular structure having an output for the objects corresponding to each said path jointly defined by said gate assembly and said deduster assembly.

14. The system according to claim 13 wherein said separator arrangement is comprised of a screen arranged to define a pair of longitudinally extending adjacent troughs in said tubular structure partitioned by a vertically oriented extension thereof, said separator arrangement enabling a separation of the loose particles from the objects.

15. The system according to claim 13 wherein said deduster assembly further includes a chute arrangement coupled to the output portion of said tubular structure, said chute arrangement having a separate respective chute for each output of said tubular structure leading to a predefined destination for each said defined path.