Packaging system

1. A packaging system comprising:

a packaging machine that has a plurality of first holding portions provided to be intermittently movable, and sequentially arranges each of the plurality of first holding portions at a plurality of stations including a supply station and a discharge station; and

a relay device that supplies a bag to the first holding portion arranged at the supply station and receives a bag discharged from the first holding portion arranged at the discharge station,

wherein the relay device includes:

a relay rotary table which intermittently rotates about a relay rotation axis extending parallel to a height direction;

a plurality of second holding portions which are attached to the relay rotary table and arranged at a pre-stage delivery station, the supply station, the discharge station, and a post-stage delivery station according to rotation of the relay rotary table; and

an adjustment unit which adjusts a relative angle of each of the plurality of second holding portions with respect to the relay rotary table,

wherein each of the plurality of second holding portions transfers a bag received at the pre-stage delivery station to the supply station and transfers a bag received at the discharge station to the post-stage delivery station, and

wherein the adjustment unit adjusts the relative angle of the second holding portion arranged at the supply station so as to match an angle of the first holding portion arranged at the supply station, and adjusts the relative angle of the second holding portion arranged at the discharge station so as to match an angle of the first holding portion arranged at the discharge station.

2. The packaging system as defined in claim 1 , wherein the adjustment unit includes:

a plurality of fixed shafts which are fixed to the relay rotary table and rotate about the relay rotation axis along with the relay rotary table;

a plurality of swinging portions which are rotatably attached to the plurality of fixed shafts, respectively;

a swing mechanism which swings each of the plurality of swinging portions depending on a position of the corresponding fixed shaft around the relay rotation axis; and

a plurality of rotary shafts which are respectively connected to the plurality of swinging portions, respectively connected to the plurality of second holding portions, and provided to be rotatable about a holding rotation axis which is a central axis of each of the plurality of rotary shafts, the plurality of rotary shafts each rotating about the holding rotation axis by an angle corresponding to swinging of the corresponding swinging portion, and

wherein the relative angle of each of the plurality of second holding portions is adjusted as each of the plurality of second holding portions rotates about the holding rotation axis along with the corresponding rotary shaft.

3. The packaging system as defined in claim 2 , wherein the swing mechanism includes:

a plurality of guide shafts which are fixed to the plurality of swinging portions, respectively; and

a guide plate which has a guide portion formed around the relay rotation axis, does not rotate about the relay rotation axis, and causes the plurality of guide shafts to be guided by the guide portion,

wherein the guide portion guides the plurality of guide shafts in such a manner that a distance between the relay rotation axis and each of the plurality of guide shafts varies in a rotation direction about the relay rotation axis, and

wherein each of the plurality of swinging portions swings about the corresponding fixed shaft depending on the distance of the corresponding guide shaft from the relay rotation axis.

4. The packaging system as defined in claim 3 , wherein the relay device further includes:

an elevating mechanism which raises and lowers the plurality of second holding portions parallel to the height direction;

a detection sensor which detects a position in the height direction of a bag held by the second holding portion arranged at the supply station or on an upstream side of the supply station; and

a control unit which controls the elevating mechanism in accordance with a detection result of the detection sensor and adjusts a position of each of the plurality of second holding portions in the height direction.

5. The packaging system as defined in claim 4 , wherein the plurality of second holding portions are arranged at a plurality of attachment positions which are angular positions different from each other in a rotational direction about the relay rotation axis.

6. The packaging system as defined in claim 5 , wherein at least some of the plurality of second holding portions are simultaneously arranged at the pre-stage delivery station, the supply station, the discharge station, and the post-stage delivery station.

7. The packaging system as defined in claim 3 , wherein the plurality of second holding portions are arranged at a plurality of attachment positions which are angular positions different from each other in a rotational direction about the relay rotation axis.

8. The packaging system as defined in claim 7 , wherein at least some of the plurality of second holding portions are simultaneously arranged at the pre-stage delivery station, the supply station, the discharge station, and the post-stage delivery station.

9. The packaging system as defined in claim 2 , wherein the relay device further includes:

an elevating mechanism which raises and lowers the plurality of second holding portions parallel to the height direction;

a detection sensor which detects a position in the height direction of a bag held by the second holding portion arranged at the supply station or on an upstream side of the supply station; and

a control unit which controls the elevating mechanism in accordance with a detection result of the detection sensor and adjusts a position of each of the plurality of second holding portions in the height direction.

10. The packaging system as defined in claim 9 , wherein the plurality of second holding portions are arranged at a plurality of attachment positions which are angular positions different from each other in a rotational direction about the relay rotation axis.

11. The packaging system as defined in claim 10 , wherein at least some of the plurality of second holding portions are simultaneously arranged at the pre-stage delivery station, the supply station, the discharge station, and the post-stage delivery station.

12. The packaging system as defined in claim 2 , wherein the plurality of second holding portions are arranged at a plurality of attachment positions which are angular positions different from each other in a rotational direction about the relay rotation axis.

13. The packaging system as defined in claim 12 , wherein at least some of the plurality of second holding portions are simultaneously arranged at the pre-stage delivery station, the supply station, the discharge station, and the post-stage delivery station.

14. The packaging system as defined in claim 1 , wherein the relay device further includes:

an elevating mechanism which raises and lowers the plurality of second holding portions parallel to the height direction;

a detection sensor which detects a position in the height direction of a bag held by the second holding portion arranged at the supply station or on an upstream side of the supply station; and

a control unit which controls the elevating mechanism in accordance with a detection result of the detection sensor and adjusts a position of each of the plurality of second holding portions in the height direction.

15. The packaging system as defined in claim 14 , wherein the plurality of second holding portions are arranged at a plurality of attachment positions which are angular positions different from each other in a rotational direction about the relay rotation axis.

16. The packaging system as defined in claim 15 , wherein at least some of the plurality of second holding portions are simultaneously arranged at the pre-stage delivery station, the supply station, the discharge station, and the post-stage delivery station.

17. The packaging system as defined in claim 1 , wherein the plurality of second holding portions are arranged at a plurality of attachment positions which are angular positions different from each other in a rotational direction about the relay rotation axis.

18. The packaging system as defined in claim 17 , wherein at least some of the plurality of second holding portions are simultaneously arranged at the pre-stage delivery station, the supply station, the discharge station, and the post-stage delivery station.