Capping head for the application in vacuum conditions of caps on bottles or containers in general, a capping machine comprising said head, and a method for the application of caps that can be applied by means of said machine
Described herein is a capping head for the application of caps on bottles or containers, in which the capping head is enclosed within a casing having an end mouth that engages the bottle or the container during application of the cap so as to define a closed chamber, within which the capping head is contained. Said closed chamber is set in communication with a source of vacuum so as to empty the bottle or container of the air contained therein before completion of application of the cap.
1. A capping head device for application of a cap to a container, comprising:
a casing having an end mouth designed to fit on the container so as to define a closed chamber;
a capping head disposed within said chamber, said capping head directly contacting the caps so as to apply the cap to the container; and
means for connecting said closed chamber with a source of vacuum for the purpose of communicating said vacuum to the space inside the container before the end of application of the cap on the container, said connecting means being configured to control fluid communication between said closed chamber and said source of vacuum in direct dependence on the relative axial position of said casing with respect to said capping head,
wherein said casing is mounted on said capping head so as to be movable therewith towards and away from the container, and that said closed chamber is defined by said casing when the casing engages the container as a result of the lowering movement of the capping head onto the container,
wherein said casing is mounted on the structure of the capping head with interposition of rolling bearings and has its end mouth made in an end wall that is elastically compliant within the casing, and wherein
said connection means comprise valve means set between the structure of the casing and the structure of the capping head,
said valve means comprising a valve body rigidly connected to the casing and mounted to be axially slidable with respect to a valve element, said valve element being mounted with interposition of the aforesaid rolling bearings on the structure of the capping head.