Method of detecting foreign matters mixed in a liquid contained in transparent receptacles and apparatus relevant thereto

DETAILED DESCRIPTION OF THE INVENTION In the embodiment of the present invention illustrated in FIGS.
2 through 5, parts other than the projectors 17 and 17' and the ray receivers 18 and 18' in the first inspection means 9 and the second inspection means 11 belong to well-known arts.
Therefore, some of them that are of no particular importance are herein omitted from illustration, and also as to other well-known parts than the above defined, explanation thereof will be simplified.
First, the well-known parts in the present embodiment will be explained.
Referring to FIGS.
2 and 3, the reference numeral 1 denotes a screw feeder which supplies receptacles loaded on a belt conveyor 2 to a star wheel 3.
The receptacles 50 supplied to the notches of the star wheel 3 are guided by a guide plate 4 with the rotation of the star wheel 3 to be supplied to seats 6 of a turntable 5.
The turntable 5 rotates continuously and synchronously with the star wheel 3, and the receptacles 50 supplied to the seats 6 of this turntable 5 are firmly held by caps 7 which hang in vertically movable fashion from a supporting plate 47 mounted on posts 46 erected on the turntable 5.
On the periphery of the turntable 5 there are installed the first turning means for receptacle 8, the first inspection means 9, the second turning means for receptacle 10 and the second inspection means 11, and the first and second turning means for receptacle are respectively provided with a motor 12, a pulley 13 and a belt 14.
This belt 14 comes in contact with a pulley 15 fixed on the supporting shaft of the seat 6 supported on the turntable 5 in rotatable fashion, and rotates the receptacle 50 at high speed.
The first and second inspection means 9 and 11 are respectively equipped with a projector 17 and a ray receiver 18.
This projector 17 is, as illustrated in FIGS.
3 and 5, provided with a lens case 42 which accommodates condenser lenses 31, 31' disposed in the front part thereof and projection heads 30 disposed in the rear part thereof to confront the respective lenses