초록 ▼

A roller assembly is provided for spreading and chilling a web in a printing press. The roller assembly includes a roller for chilling and spreading a web and a trolley roller contacting the roller, the trolley roller configured and arranged to impart a deflection in the roller. Also provided is a r

A roller assembly is provided for spreading and chilling a web in a printing press. The roller assembly includes a roller for chilling and spreading a web and a trolley roller contacting the roller, the trolley roller configured and arranged to impart a deflection in the roller. Also provided is a roller assembly for counteracting web loading on a roller in a printing press. This roller assembly includes a roller for transporting a web, the roller having an axis; a web wrapped partially around the roller and applying a load on the roller transverse to the axis; and a trolley roller contacting the roller, the trolley roller configured and arranged to impart a sufficient force on the roller to keep the axis of the roller linear under said load.

대표청구항 ▼

1. A roller assembly for spreading and chilling a web in a printing press comprising: a roller for chilling and spreading a web;a trolley roller contacting the roller, the trolley roller configured and arranged to impart a deflection in the roller; anda light source positioned to transmit light towa

1. A roller assembly for spreading and chilling a web in a printing press comprising: a roller for chilling and spreading a web;a trolley roller contacting the roller, the trolley roller configured and arranged to impart a deflection in the roller; anda light source positioned to transmit light towards the roller, whereby the light source cures ink on a web as the web passes over the roller. 2. The roller assembly as recited in claim 1, further comprising an actuator connected to the trolley roller, the actuator causing the trolley roller to impart the deflection. 3. The roller assembly of claim 1, wherein a web wraps around the roller, and the trolley roller contacts the roller in an area where the web is not present. 4. The roller assembly recited in claim 1 wherein the trolley roller contacts the roller substantially at a mid-span of the roller. 5. The roller assembly as recited in claim 1 wherein the ends of the roller are not deflected by the contact. 6. The roller assembly as recited in claim 1 wherein the axis of the roller is non-linear under said deflection. 7. The roller assembly as recited in claim 1, wherein the light source is an ultraviolet light source. 8. The roller assembly as recited in claim 1, wherein the roller is a flexible roller having an outside diameter of from about 4 inches to about 10 inches. 9. The roller assembly as recited in claim 8, wherein the flexible roller has an outer shell defining said outside diameter. 10. The roller assembly as recited in claim 9, wherein the outer shell has a wall thickness of about 0.3+/−0.2 inches. 11. The roller assembly as recited in claim 10, wherein the outside diameter is from about 7 inches to about 8 inches. 12. A printing press comprising: a printing section for printing on a web; andat least one roller assembly as recited in claim 1. 13. The printing press as recited in claim 12, wherein the at least one roller assembly is a plurality of roller assemblies. 14. A method for spreading and chilling a web comprising the steps of: passing a web over a roller assembly as recited in claim 1. 15. A roller assembly for spreading and chilling a web in a printing press comprising: a roller for chilling and spreading a web; anda trolley roller contacting the roller, the trolley roller configured and arranged to impart a deflection in the roller;wherein the roller is a flexible roller having an outside diameter of from about 4 inches to about 10 inches;wherein the flexible roller has an outer shell defining said outside diameter;wherein the outer shell has a wall thickness of about 0.3+/−0.2 inches;wherein the outer shell is made of aluminum. 16. A method for minimizing fluting in a web comprising the steps of: passing a web over a roller, the roller chilling the web;contacting the roller with a trolley roller causing the roller to deflect;spreading the web due to the deflection of the roller; andproviding a light source positioned to transmit light towards the roller, whereby the light source cures ink on a web as the web passes over the roller. 17. The method of claim 16, wherein the roller is a flexible roller having an outside diameter of from about 4 inches to about 10 inches, the flexible roller has an outer shell defining said outside diameter, wherein the outer shell has a wall thickness of about 0.3+/−0.2 inches, wherein the outside diameter is from about 7 inches to about 8 inches.