A welding head comprises a welding element for welding a lid to an opening device of a container, a supporting body for supporting the welding element and a compensating device for compensating a possible mutual mispositioning of the welding element and the lid during welding of the lid to the opening device, the compensating device being interposed between the supporting body and the welding element, the compensating device comprising a planar spring arrangement provided with at least one planar spring element having a first member and a second member mutually connected by deformable elements.

Screw cap, loading piston, and method for aligning the screw cap and the loading piston in relation to each other and a method for screwing a screw cap onto a threaded neck portion of a packaging container. The screw cap can include a base portion having a top and a bottom surface, an annular portion raised from the base portion, the annular portion having an inner and an outer surface, and at least one first threaded portion arranged on the inner surface of the annular portion, wherein the base portion can include engagement means, such that the screw cap can engage a tool with at least one complementary engagement means in a process of screwing the cap onto the container with the complementary threaded neck portion.

A capping head for the application of caps on containers or bottles, as well as a capping assembly, are provided. The capping head comprises a hollow housing internally defining at least a first chamber in which a shaft rotating about a longitudinal axis is housed, the rotating shaft being coupled with the hollow housing through the interposition of a magnetic or electromagnetic decoupling assembly comprising at least a rotor and a stator. The decoupling assembly being suitable to allow a relative rotation between the hollow housing and the rotating shaft when the rotating shaft is subjected to a braking torque exceeding a threshold torque. Means for enhancing the thermal dissipation power generated by the decoupling assembly is located inside the hollow housing.

A quick-change coupling is described for a container treatment machine, in particular a capping machine, with an outer member and an inner member engaging therewith in a positive-fit manner, between which members torques in a working direction of rotation and axial forces can be transmitted. Due to the fact that the outer member and the inner member are connectable to each other by pushing one into the other and twisting, a simple connection/separation of the quick-change coupling is possible without tools, as well as reliable and play-free transmission of unidirectional torques and contact pressure forces.

Screw cap (200), loading piston (300), method for aligning the screw cap (200) and the loading piston (300) in relation to each other and a method for screwing a screw cap (200) onto a threaded neck portion of a packaging container. The screw cap (200) comprises a base portion (210) comprising a top (212) and a bottom surface (214); an annular portion (220) raised from the base portion (210), the annular portion having an inner (222) and an outer surface (224); at least one first threaded portion (252) arranged on the inner surface (222) of the annular portion, wherein
the base portion (210) comprises engagement means (240), such that the screw cap (200) is configured to engage a tool (300) with at least one complementary engagement means in a process of screwing the cap onto the container with the complementary threaded neck portion.

A capping machine includes a gripper having a pair of gripping arms provided on an outer peripheral portion of a rotating body and configured to grip a cylindrical portion of a vessel, an opening and closing device configured to open and close the gripping arms, and a capping head liftably and rotatably provided on the rotating body. The gripping arms are arranged symmetrically with respect to a radius of the rotating body. The gripper has a protrusion for preventing the vessel from rotating on a vessel gripping surface of the gripping arms. The gripping arms have outer and inner gripping surfaces which are connected in a V shape. The protrusion is formed only on the inner gripping surface of a right gripping arm. A cap held by the capping head is screwed onto the vessel while sticking the protrusion into the cylindrical portion.

A cap attachment-detachment device includes an operation portion that moves in an up-and-down direction, and grips and rotates a cap so as to attach the cap to or attach the cap from a container. The operation portion includes a first grip claw, a second grip claw and the pressing member. The first grip claw and the second grip claw are provided to be opposite to each other and configured to be capable of applying an obliquely upward force inwardly to an upper portion of a side surface of the cap. The pressing member is configured to be capable of coming into contact with an upper surface of the cap.

The present invention concerns a motion transmission group for capping heads for screw caps. This group comprises a device for applying in use a predefined axial load to means of axial engagement of the caps which a capping head associated in use with said group is provided with. The device comprises at least one axially pre-loaded compression spring so as to generate in use this predefined axial load. The device is separable from the main structure of the transmission group as a single body, with the aforesaid at least one spring maintained associated with a support structure of the device in pre-loaded condition by means of two axial positioning portions to allow the replacement of the device with a structurally similar device, but suitable to generate in use a different axial load.

A capping machine includes a gripper having a pair of gripping arms provided on an outer peripheral portion of a rotating body and configured to grip a cylindrical portion of a vessel, an opening and closing device configured to open and close the gripping arms, and a capping head liftably and rotatably provided on the rotating body. The gripping arms are arranged symmetrically with respect to a radius of the rotating body. The gripper has a protrusion for preventing the vessel from rotating on a vessel gripping surface of the gripping arms. The gripping arms have outer and inner gripping surfaces which are connected in a V shape. The protrusion is formed only on the inner gripping surface of a right gripping arm. A cap held by the capping head is screwed onto the vessel while sticking the protrusion into the cylindrical portion.

A system and method for a self-actuating, mechanically-biased container restraint. The system requires no computer-aided control or timing, nor is any external power source needed, other than the force exerted as a container is inserted into the restraint. The system relies upon an assembly including mechanically-biased pivoting levers, each of which has a horizontal element and a vertical element. All actuation occurs as the base of an inserted container comes into contact with the upper surface of the horizontal elements of multiple pivoted levers positioned at the base of a channel adapted to serve as a guide for the inserted tube. The levers are biased in this elevated position by mechanical means, such as a spring. As the inserted tube presses the horizontal members downward, the top portions of the vertical members are pivoted inward toward the container's exterior. Friction pads situated upon the interior surface of each vertical element are brought into contact with the exterior of the container, thereby gripping it. This gripping action holds the container with sufficient friction to permit the removal or attachment of a screw cap. Further embodiments of the invention include a mechanically biased platform supporting the channel and the pivoting levers. This base is biased and positioned to permit the channel and the pivoting lever assembly to be translated downward against the force biasing the platform and translate through the body of the container restraint. This further advancement of container, the channel and the lever assembly cause the pivoting levers to assume fully engaged gripping positions, and brings the vertical elements of the levers (and flexible friction pads upon them) into full upright positions. In this position the friction pads apply a maximum static friction force to the exterior of the container.