Roller bender for offset printing plates

Claim 2

An end bender for off-set printing plates comprising a table to receive the plates to be bent, means locating said plates on said table, said table including end edges having contours the same as those desired for the ends of the plates after bending, roller means, means arranged and constructed to cause said roller means to engage said contoured end edges and bend the ends of the plates by a cooperative rolling action of the roller means over the contoured end edges of the table, supporting means for carrying the table and the roller means, arms pivotally mounted intermediate their ends on said supporting means, said roller means having ends thereof journally mounted in the ends of the arms on one side of the pivotal mountings, spring means engaging the other ends of the arms and arranged to urge said roller means against the contoured end edges of the table, and means moving said table past said roller means whereby the roller means follows the contours of the end edges causing the plate to be roll bent therearound.

Claim 3

An end bender for the plates of offset printing plates comprising a supporting structure, a table mounted on said supporting structure, said table adapted to receive plates to be bent, means locating said plates on said table, said table including end edges having contours the same as those desired for the ends of the plates after bending, roller means, means mounting said roller means on said supporting structure, spring biasing means arranged and constructed to cause said roller means to yieldably engage said contoured end edges and bend the ends of the plates by a cooperative rolling action of the roller means over the contoured end edges of the table said table movable relative to said supporting structure, and said means for mounting said roller means on the supporting structure including arms pivotally mounted intermediate their ends on said supporting structure, said roller means journally mounted in the ends of the arms on one side of their pivotal mounting, said spring biasing means including spring means engaging the other ends of the arms and arranged to urge said roller means against the contoured end edges of the table, and means moving said table past said roller means whereby the roller means follows the contours of the end edges causing the plate to be roll bent therearound.

Claim 4

An end bender for the plates of offset printing plates comprising a supporting structure, a table mounted on said supporting structure, said table adapted to receive plates to be bent, means locating said plates on said table, said table including end edges having contours the same as those desired for the ends of the plates after bending, roller means, means mounting said roller means on said supporting structure, spring biasing means arranged and constructed to cause said roller means to yieldably engage said contoured end edges and bend the ends of the plates by a cooperative rolling action of the roller means over the contoured end edges of the table said table movable relative to said supporting structure, and said means for mounting said roller means on the supporting structure including arms pivotally mounted intermediate their ends on said supporting structure, said roller means journally mounted in the ends of the arms on one side of their pivotal mounting, said spring biasing means including spring means engaging the other ends of the arms and arranged to urge said roller means against the contoured end edges of the table, and means moving said table past said roller means whereby the roller means follows the contours of the end edges causing the plate to be roll bent therearound.

Claim 5

An end bender as set forth in claim 1 in which said table has at least one end edge which is movable from a retracted position to an extended position, and said means moving said table past said roller means comprises means to first extend said table end edge.

Claim 6

A device as set forth in claim 3 in which said means for moving said table past said roller means and the means to first extend said table end edge comprises a fluid cylinder pivotably mounted at its lower end on said supporting means, said cylinder having at its other end an extendable piston, toggle linkage associated with said extendable piston and said table end edge whereby initial extension of said piston causes said toggle linkage to extend said end edge, and collar means on said piston arranged and constructed to engage and move said table after said toggle linkage has extended said end edge.

Claim 7

A device as set forth in claim 4 in which said toggle linkage is equipped with a coupling intermediate the ends thereof to adjust the length thereof by shimming.

Claim 8

An offset printing plate bender comprising a supporting structure, a table arranged to receive a plate to be bent, said table mounted on and capable of movement relative to said supporting structure, means moving said table in one direction on said supporting structure, said table including spaced apart end edges having contours the same as those desired for the ends of the printing plate after bending, said spaced apart end edges of said table constituting plate bendIng edges, means spreading at least one of said bending edges outwardly prior to moving said table in the said one direction on said supporting structure, spaced apart arms pivotally mounted on said supporting structure, a roller carried at one end of each of said spaced apart arms, spring means normally urging said rollers inwardly toward said spaced apart bending edges of said table, said means moving said table in the one direction with its outwardly spread bending edge and plate mounted thereon past said rollers whereby the rollers cause the ends of the plate to be bent over the contoured bending edges of the table, means moving said table in the opposite direction for return to its original position on said supporting structure, and means subsequently retracting said outwardly spread bending edge prior to removal of said printing plate after having its ends bent.

Claim 9

An offset printing plate bender comprising a supporting structure, a table arranged to receive a plate to be bent, said table mounted on and capable of movement relative to said supporting structure, means moving said table in one direction on said supporting structure, said table including spaced apart end edges having contours the same as those desired for the ends of the printing plate after bending, said spaced apart end edges of said table constituting plate bendIng edges, means spreading at least one of said bending edges outwardly prior to moving said table in the said one direction on said supporting structure, spaced apart arms pivotally mounted on said supporting structure, a roller carried at one end of each of said spaced apart arms, spring means normally urging said rollers inwardly toward said spaced apart bending edges of said table, said means moving said table in the one direction with its outwardly spread bending edge and plate mounted thereon past said rollers whereby the rollers cause the ends of the plate to be bent over the contoured bending edges of the table, means moving said table in the opposite direction for return to its original position on said supporting structure, and means subsequently retracting said outwardly spread bending edge prior to removal of said printing plate after having its ends bent.