Inspection device for the quality control of rod-shaped articles

1 . An inspection device for the quality control of rod-shaped articles, the device comprising:

a drum defining an outer surface and including a plurality of seats, each seat of the plurality adapted to receive a rod-shaped article;

an inductive sensor located at a seat of the plurality, the inductive sensor including a coil defining an inner volume large enough to receive therein an end of the rod-shaped article, the inductive sensor being adapted to sense a characteristic of a susceptor in the rod-shaped article;

wherein the coil includes a first semi-coil and a second semi-coil, the first semi-coil and the second semi-coil being movable from a first operative position where the first semi-coil and the second semi-coil are in contact to each other forming the coil where current can flow to a second operative position where the first semi-coil and the second semi-coil are separated from each other, and vice-versa;

the first semi-coil being located below the outer surface of the drum and the second semi-coil being located above the outer surface of the drum; and

an actuator adapted to move the first semi-coil and the second semi-coil from the first operative position to the second operative position and vice-versa.

2 . The inspection device according to claim 1 , including a control unit adapted to command the actuator to move the first semi-coil or the second semi-coil from the second operative position to the first operative position when a rod-shaped article is on the seat.

3 . The inspection device according to claim 1 - or 2 , wherein the seat includes a receiving surface, part of the outer surface of the drum, and wherein the first semi-coil is located below the receiving surface of the seat.

4 . An inspection device for the quality control of rod-shaped articles, the device comprising:

a drum including a plurality of seats, each seat of the plurality adapted to receive a rod-shaped article;

an inductive sensor located at a seat of the plurality, the inductive sensor including a coil defining an inner volume large enough to receive therein an end of the rod-shaped article, the inductive sensor being adapted to sense a characteristic of a susceptor in the rod-shaped article;

a compressed air system aligned with the seat of the plurality;

an actuator adapted to activate the compressed air system to blow air when the rod-shaped article is located in the seat to push the rod-shaped article inside the coil.

5 . The inspection device according to claim 1 , wherein the drum has a rotational axis and each seat of the plurality defines a longitudinal axis, the longitudinal axis and the rotational axis being parallel to each other.

6 . The inspection device according to claim 1 , wherein the length of the coil is comprised between 20 millimeters and 40 millimeters.

7 . The inspection device according to claim 1 , comprising a control unit electrically connected to the inductive sensor, the control unit being adapted to receive a signal from the inductive sensor and to compare the signal with a threshold.

8 . The inspection device according to claim 7 , wherein the control unit is adapted to calculate a length of a susceptor located in the rod-shaped article.

9 . The inspection device according to claim 1 , comprising a rejection device, adapted to reject rod-shaped articles on the basis of a signal emitted by the inductive sensor.

10 . The inspection device according to claim 1 , wherein the drum comprises a plurality of inductive sensors, a sensor for each seat of the plurality of seats.

11 . The inspection device according to claim 1 , wherein the seat defines a seat axis and the coil defines a coil axis, and wherein the coil axis and the seat axis are parallel to each other.

12 . An inspection device comprising:

a first drum defining a first outer surface and including a first plurality of seats, each seat of the first plurality adapted to receive a rod-shaped article;

a first inductive sensor positioned at a seat of the first plurality, the first inductive sensor including a first coil defining an inner volume large enough to receive therein a first end of the rod-shaped article, the first inductive sensor being adapted to sense a characteristic of a first susceptor in the rod-shaped article;

wherein the first coil includes a first semi-coil and a second semi-coil, the first semi-coil and the second semi-coil being movable from a first operative position where the first semi-coil and the second semi-coil are in contact to each other forming the first coil where current can flow to a second operative position where the first semi-coil and the second semi-coil are separated from each other, and vice-versa;

the first semi-coil being located below the first outer surface of the first drum and the second semi-coil being located above the first outer surface of the first drum;

a first actuator adapted to move the first semi-coil and the second semi-coil of the first coil from the first operative position to the second operative position and vice-versa in the first drum;

a second drum defining a second outer surface and including a second plurality of seats, each seat of the second plurality being adapted to receive a rod-shaped article;

a second inductive sensor located at a seat of the second plurality, the second inductive sensor including a second coil defining an inner volume large enough to receive therein a second end of the rod-shaped article, the second inductive sensor being adapted to sense a characteristic of a second susceptor in the rod-shaped article;

wherein the second coil includes a first semi-coil and a second semi-coil, the first semi-coil and the second semi-coil being movable from a first operative position where the first semi-coil and the second semi-coil are in contact to each other forming the second coil where current can flow to a second operative position where the first semi-coil and the second semi-coil are separated from each other, and vice-versa;

the first semi-coil of the second coil being located below the second outer surface and the second semi-coil of the second coil being located above the second outer surface;

a second actuator adapted to move the first semi-coil and the second semi-coil of the second coil from the first operative position to the second operative position and vice-versa in the second drum;

the first drum and the second drum being substantially tangent so as to allow a transfer of the rod-shaped article from the first drum to the second drum.

13 . An inspection device comprising:

a first drum including a first plurality of seats, each seat of the first plurality adapted to receive a rod-shaped article;

a first inductive sensor located at a seat of the first plurality, the first inductive sensor including a first coil defining an inner volume large enough to receive therein a first end of the rod-shaped article, the first inductive sensor being adapted to sense a characteristic of a first susceptor in the rod-shaped article;

a first compressed air system aligned with the seat of the first plurality;

a first actuator adapted to activate the first compressed air system to blow air when the rod-shaped article is located in the seat of the first plurality to push the rod-shaped article inside the first coil;

a second drum including a second plurality of seats, each seat of the second plurality adapted to receive a rod-shaped article;

a second inductive sensor positioned at a seat of the second plurality, the second inductive sensor including a second coil defining an inner volume large enough to receive therein a second end of the rod-shaped article, the second inductive sensor being adapted to sense a characteristic of a second susceptor in the rod-shaped article;

a second compressed air system aligned with the seat of the second plurality;

a second actuator adapted to activate the second compressed air system to blow air when the rod-shaped article is located in the seat of the second plurality to push the rod-shaped article inside the second coil of the second drum;

the first drum and the second drum being substantially tangent so as to allow a transfer of the rod-shaped article from the first drum to the second drum.

14 . A method to inspect rod-shaped articles, comprising:

providing an inspection device according to claim 1 ;

positioning the rod-shaped article in the seat of the drum wherein the first semi-coil and the second semi-coil are in the second operative position;

moving the first semi-coil and the second semi-coil in the first operative position; and

sensing a characteristic of the susceptor.

15 . A method to inspect rod-shaped articles, comprising:

providing an inspection device according to claim 2 ;

positioning the rod-shaped article in the seat of the drum;

pushing the rod-shaped article in the coil by means of an air flow; and

sensing a characteristic of the susceptor.

16 . The inspection device according to claim 4 , wherein the drum has a rotational axis and each seat of the plurality defines a longitudinal axis, the longitudinal axis and the rotational axis being parallel to each other.

17 . The inspection device according to claim 4 , wherein the length of the coil is comprised between 20 millimeters and 40 millimeters.

18 . The inspection device according to claim 4 , comprising a control unit electrically connected to the inductive sensor, the control unit being adapted to receive a signal from the inductive sensor and to compare the signal with a threshold.

19 . The inspection device according to claim 18 , wherein the control unit is adapted to calculate a length of a susceptor located in the rod-shaped article.

20 . The inspection device according to claim 4 , comprising a rejection device, adapted to reject rod-shaped articles on the basis of a signal emitted by the inductive sensor.