Capping device with bearing mechanism having a plurality of bearing members between a drive member and a capper body
A capping device fits caps onto containers by applying an axial force to the caps as they are threaded onto the containers. The capping device utilizes a drive member rotatable about an operational axis for imparting rotation to a capper body slidably coupled to the drive member. A helical spring urges the capper body away from the drive member with a biasing force. A bearing mechanism allows relative free sliding movement of the capper body relative to the drive member. The bearing mechanism includes a plurality of bearing members. In one embodiment, the bearing members are bushings. In another embodiment, the bearing members are ball bearings.
1. A capping device for fitting caps onto containers, said device comprising:
a drive member rotatable about an operational axis and defining a plurality of bores;
a capper body slidably coupled to said drive member and rotatably fixed to said drive member;
a biasing member urging said capper body away from said drive member with a biasing force; and
a bearing mechanism disposed between said drive member and said capper body for allowing relative sliding movement between said drive member and said capper body while preventing relative rotational movement between said drive member and said capper body, said bearing mechanism including a plurality of bushings having a generally annular shape disposed in said bores of said drive member and a plurality of guide shafts fixed to said capper body and slidable within said plurality of bushings.
2. A capping device as set forth in claim 1 wherein each of said plurality of bushings are spaced radially from said operational axis.
3. A capping device as set forth in claim 1 wherein each of said plurality of bushings are spaced circumferentially about said operational axis from one another.
4. A capping device as set forth in claim 1 wherein said plurality of bushings includes three bushings.
5. A capping device as set forth in claim 1 wherein each of said plurality of bushings includes a plurality of ribs defining an inner surface in contact with said guide shafts.
6. A capping device as set forth in claim 5 wherein said ribs are circumferentially spaced and define channels therebetween.
7. A capping device as set forth in claim 1 wherein each of said plurality of bushings includes a flexible body having an elongated opening defined therethrough so that said body is split and able to be compressed in diameter for fitting into said bore in said drive member.
8. A capping device as set forth in claim 7 wherein each of said plurality of bushings includes a flange portion extending radially outwardly from said body and each of said bores of said drive member defines an annular cavity for receiving said flange portion.