A mandrel for use in a printing apparatus includes a substantially cylindrical mandrel shaft and plastic expansion rings that are slidably and coaxially mounted on the mandrel shaft. The mandrel also includes a locking assembly including a fixed stop ring and a single locking ring that is axially movably mounted on the mandrel shaft. The expansion rings are positioned between the stop ring and the locking ring. In the unlocked position of the locking ring the expansion rings are in a released state in which the axial compression and the radial expansion of the expansion rings are smaller than in a locked position of the locking ring. A printing cylinder sleeve can be fixedly connected to the mandrel by bringing the expansion rings in the radially expanded state. When the printing cylinder sleeve has to be exchanged, this is feasible when the expansion rings are in the released state.

A mandrel for use in a printing apparatus includes a substantially cylindrical mandrel shaft and plastic expansion rings that are slidably and coaxially mounted on the mandrel shaft. The mandrel also includes a locking assembly including a fixed stop ring and a single locking ring that is axially movably mounted on the mandrel shaft. The expansion rings are positioned between the stop ring and the locking ring. In the unlocked position of the locking ring the expansion rings are in a released state in which the axial compression and the radial expansion of the expansion rings are smaller than in a locked position of the locking ring. A printing cylinder sleeve can be fixedly connected to the mandrel by bringing the expansion rings in the radially expanded state. When the printing cylinder sleeve has to be exchanged, this is feasible when the expansion rings are in the released state.

A layer transferring device includes: a main casing having an opening and accommodating a heat roller, a motor, and a first transmission gear therein; a film cartridge; and a cover at which a pressure roller and a second transmission gear is provided and movable about a pivot axis to open and close the opening. The heat roller is movable toward and away from the pressure roller when the cover is closed. When the film cartridge is attached to the main casing and the cover is closed, the multilayer film contacts and passes through between the pressure roller and the heat roller. When the cover is closed, the first transmission gear for receiving a driving force from the motor and the second transmission gear for transmitting a driving force to the pressure roller are positioned between the pivot axis and the heat roller and in meshing engagement with each other.

A layer transferring device includes: a main casing having an opening and accommodating a heat roller, a motor, and a first transmission gear therein; a film cartridge; and a cover at which a pressure roller and a second transmission gear is provided and movable about a pivot axis to open and close the opening. The heat roller is movable toward and away from the pressure roller when the cover is closed. When the film cartridge is attached to the main casing and the cover is closed, the multilayer film contacts and passes through between the pressure roller and the heat roller. When the cover is closed, the first transmission gear for receiving a driving force from the motor and the second transmission gear for transmitting a driving force to the pressure roller are positioned between the pivot axis and the heat roller and in meshing engagement with each other.

An over-varnish unit and mandrel pre-spin system for a can decorator, especially for beverage can bodies, can have a mandrel pre-spin belt that is outside of the over-varnish unit housing. The position of the can infeed on the mandrel wheel and the print point is controlled.

An over-varnish unit and mandrel pre-spin system for a can decorator, especially for beverage can bodies, can have a mandrel pre-spin belt that is outside of the over-varnish unit housing. The position of the can infeed on the mandrel wheel and the print point is controlled.

A layer transferring device includes: a main casing having an opening and accommodating a heat roller, a motor, and a first transmission gear therein; a film cartridge; and a cover at which a pressure roller and a second transmission gear is provided and movable about a pivot axis to open and close the opening. The heat roller is movable toward and away from the pressure roller when the cover is closed. When the film cartridge is attached to the main casing and the cover is closed, the multilayer film contacts and passes through between the pressure roller and the heat roller. When the cover is closed, the first transmission gear for receiving a driving force from the motor and the second transmission gear for transmitting a driving force to the pressure roller are positioned between the pivot axis and the heat roller and in meshing engagement with each other.

A layer transferring device includes: a main casing having an opening and accommodating a heat roller, a motor, and a first transmission gear therein; a film cartridge; and a cover at which a pressure roller and a second transmission gear is provided and movable about a pivot axis to open and close the opening. The heat roller is movable toward and away from the pressure roller when the cover is closed. When the film cartridge is attached to the main casing and the cover is closed, the multilayer film contacts and passes through between the pressure roller and the heat roller. When the cover is closed, the first transmission gear for receiving a driving force from the motor and the second transmission gear for transmitting a driving force to the pressure roller are positioned between the pivot axis and the heat roller and in meshing engagement with each other.

An over-varnish unit and mandrel pre-spin system for a can decorator, especially for beverage can bodies, can have a mandrel pre-spin belt that is outside of the over-varnish unit housing. The position of the can infeed on the mandrel wheel and the print point is controlled.

An over-varnish unit and mandrel pre-spin system for a can decorator, especially for beverage can bodies, can have a mandrel pre-spin belt that is outside of the over-varnish unit housing. The position of the can infeed on the mandrel wheel and the print point is controlled.