Varnishing apparatus
View Patent ↗To provide a varnishing apparatus for indirect printing with the lowest possible structural outlay, a varnishing mechanism of the varnishing apparatus for varnishing webs includes a form cylinder and a transfer cylinder, the web running between the transfer cylinders. At least one of the form cylinders bears a gravure printing form such that the web may be varnished on one or both sides.
1. A combination including a varnishing apparatus for varnishing a web and a dryer being arranged upstream or downstream of the varnishing apparatus, said varnishing apparatus comprising:
first and second varnishing mechanisms, each including a form cylinder and a transfer cylinder, the web having two sides running between the transfer cylinders, at least one of the form cylinders includes a gravure printing form, said varnishing apparatus being arranged for varnishing one of the sides of the web when one of said form cylinders includes a gravure printing form and varnishing both of the sides of the web when each of the form cylinders includes a gravure printing form, wherein each of said form cylinder and transfer cylinder comprise two ends and said varnishing apparatus includes side walls for holding the ends of said form cylinders and transfer cylinders, each of said side walls defining an opening therethrough with two sides, rectilinear guide elements being arranged on at least one side of each of said openings, at least one of said form cylinder and transfer cylinder of each of said first and second varnishing mechanisms comprising slides slidably arranged on said rectilinear guide elements. such that a space between the form and transfer cylinders of each of said first and second varnishing mechanisms is adjustable.
2. The combination of claim 1 , wherein only one of the form cylinders includes a gravure printing form and the other form cylinder includes an offset printing form, said varnishing apparatus further comprising a gravure inking unit settable against the form cylinder having the gravure printing form and an offset inking unit settable against the form cylinder having the offset printing form.
3. The combination of claim 1 , wherein one of said transfer cylinders is an impression cylinder.
4. The combination of claim 1 , wherein said form cylinder includes a replaceable sleeve-like printing form having an external diameter, said replaceable sleeve-like printing form being replaceable by replacement sleeve-like printing forms of the same or different external diameter.
5. The combination of claim 1 , wherein said form cylinder of each of said first and second varnishing mechanisms has an external diameter and is replaceable by a replacement form cylinder of the same or different external diameter.
6. The combination of claim 1 , further comprising a sleeve arranged on each of the transfer cylinders.
7. The combination of claim 1 , wherein each of said first and second varnishing mechanisms further comprises an inking unit settable on said form cylinders, said inking units being movably arranged for moving along said rectilinear guide elements.
8. The combination of claim 1 , wherein each of said first and second varnishing mechanisms further comprises an inking unit settable on said form cylinders, said inking units being arranged in a fixed position in said varnishing apparatus.
9. The combination of claim 7 , wherein said first and second varnishing mechanisms each comprise a moving device for moving said inking units in a direction approximately normal to a length of said rectilinear guide.
10. The combination of claim 1 , wherein at least one of the transfer cylinder and form cylinder of each of said first and second varnishing mechanisms is driven by an electric motor.