Apparatus for separating small articles

• US 5,826,696 A
• Filed: 08/10/1995
• Issued: 10/27/1998
• Est. Priority Date: 08/11/1994
• Status: Expired due to Fees

• Current Assignee: Walter Grassle GmbH
• Original Assignee: Walter Grassle GmbH
• Inventors: Varhaniovsky, Gyula, Schiffer, Werner, Kirchner, Thomas, Asteriadis, Nikolaus, Rupp, Michael
• Primary Examiner(s): Terrell, William E.
• Assistant Examiner(s): Tran, Khoi H.
• Application Number:
  US08/513,238
• Time in Patent Office: 1,174 Days
• Field of Search: 198/392, 198/396, 198/397, 198/443
• US Class Current: 198/392
• CPC Class Codes: B07C 5/36 Sorting apparatus characterised by the means used for distribution sorting according to destination B07C3/003, B07C3/02
• CPC Class Codes: B65G 29/00 Rotary conveyors, e.g. rotating discs, arms, star-wheels or cones mechanical projectors B65G31/00; screw or rotary spiral conveyors B65G33/00
• CPC Class Codes: B65G 47/1457 Rotating movement in the plane of the rotating part
• CPC Class Codes: B65G 47/848 the article-engaging elements being suction or magnetic means
• CPC Class Codes: G01N 2035/00188 the analyte being in the solid state
• CPC Class Codes: G01N 33/15 Medicinal preparations ; Physical properties thereof, e.g. dissolubility drug screening with animal cells G01N33/5008

Abstract

In an apparatus for inspecting small articles, such as in particular tablets, for obtaining a precise lining up of the articles there is a rotationally symmetrical separating body (4) rotatable about a vertical rotation axis (A), which has a substantially conical feed section (6) and a section (7, 8) for orienting and/or separating the articles (G) surrounded by a ring slot (S) at least corresponding to the thickness of the articles (G). The separating section (8) is subdivided into individual shafts (11) for receiving the articles (G) by ribs (9) circumferentially succeeding one another with a spacing at least corresponding to the width or diameter of the articles (G).

Claims

1. An apparatus for separating small articles comprising:

a rotatably mounted separating device which rotates about a vertical axis and having symmetry about the vertical axis, the device having an upper substantially conical feed section and a base extending below the conical feed section;

an outer section spaced from the base by a dimension at least equal to a thickness of the small articles and surrounding the base, the spacing of the outer section from the base defining a slot through which the small articles pass vertically;

a part of the base being divided into a plurality of spaced apart individual shafts disposed circumferentially about the base for receiving the small articles from the slot, the shafts having a dimension at least equal to the thickness of the small articles with adjacent shafts being separated by ribs between the shafts disposed circumferentially about the base;

hold back members associated with the individual shafts, each hold back member selectively blocking passage of the small articles from each shaft when disposed in a first position in the shaft and permitting the articles to pass through the shaft when disposed in second position outside the shaft, the hold back members comprising springs which, without external influence, are positioned in the first position; and

magnets associated with springs, each spring being selectively magnetically linked with the associated spring, each magnet upon being magnetically linked with the associated spring positioning the associated spring in the second position to permit the small articles to pass through the associated shaft.

2. An apparatus according to claim 1 wherein:

the outer section comprises a torus surrounding the base.

3. An apparatus according to claim 2 wherein:

the torus is fixed.

4. An apparatus according to claim 1 wherein:

the upper substantially conical feed section and the torus forms a funnel in a vicinity of a top of the slot.

5. An apparatus according to claim 1 wherein:

the outer section is substantially cylindrical.

6. An apparatus according to claim 1 wherein:

the part of the base divided into spaced apart individual shafts is a lower part of the base and is substantially frustum-shaped.

7. An apparatus according to claim 1 wherein:

an upper part of the base is substantially cylindrical.

8. An apparatus according to claim 1 further comprising:

a transfer area adjacent the base having a substantially horizontal surface for receiving the small articles from the individual shafts.

9. An apparatus according to claim 8 wherein:

the substantially horizontal surface comprises at least one disk having a face with suction holes disposed in a circular path and coupled to a vacuum source for retaining the articles.

10. An apparatus according to claim 9 wherein:

the suction holes move synchronously with lower ends of the shafts.

11. An apparatus according to claim 10 wherein:

the shafts and suction holes have an identical circumferential spacing relative to the vertical axis.

12. An apparatus according to claim 1 further comprising:

a first support for receiving the small articles from the individual;

a second support for receiving the small articles from the first support; and

a vacuum source coupled to the first and second supports for holding the articles.

13. An apparatus according to claim 12 wherein:

the separating device is concentric to and moves synchronously with the first support and is connected to the first support device.

14. An apparatus according to claim 12 further comprising:

a detector device positioned radially relative to the first support; and

suction holes coupled to the vacuum source for holding the articles on the first support.

15. An apparatus according to claim 14 wherein:

the suction holes of the first and second supports are connectable to stationary suction channels which are connectable to the vacuum source.

16. An apparatus according to claim 14 further comprising:

a bypass with a support curve for correctly positioning a supply of the articles in front of the suction holes of the first support.

17. An apparatus according to claim 12 wherein:

the first and second supports each comprise suction holes disposed in a circular path in a circumferential wall thereof, circumferential walls of the first and second supports during rotation of the first and second supports pass each other with a spacing exceeding the thickness of the articles, the suction holes facing one another and being oriented in an aligned manner to each other at a transfer point between the first and second supports.

18. An apparatus according to claim 17 further comprising:

a plurality of detector devices arranged in a vicinity of a path of movement of the suction holes, one detector device being oriented radially relative to and facing the first support, and at least one additional detector device being positioned axially parallel to and facing a path of movement of the suction holes in the second support.

19. An apparatus according to claim 1 further comprising:

a device for transferring the small articles to the separating device.

20. An apparatus according to claim 19 wherein:

the device for transferring the small articles transfers the small articles to the upper conical feed section.

21. An apparatus according to claim 19 wherein:

the device for transferring the small articles is a supply chute.

22. An apparatus according to claim 19 further comprising:

a vibrating drive for vibrating the device for transferring the articles.

23. An apparatus according to claim 19 wherein:

the device for transferring the articles has a screen for separating fragments.

24. An apparatus according to claim 1 wherein:

a bottom article in each shaft is held by the spring associated with the shaft.

25. An apparatus according to claim 1 further comprising:

separating devices disposed in the slots for separating individual small articles in the slots.