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US 5,152,224 AGranted
Isolated ink feed mechanism
AssigneeHarris Graphics Corporation
InventorGlenn A. Guaraldi
Life of this patent
Estimating the term…
Abstract
An offset printing apparatus rotates the plate cylinder steadily with a minimum of torsional interference caused by impact of the reciprocating ductor roll with the vibrator roll. The vibrator roll is driven to rotate independently of rotation of the other rolls which lead successively to the plate cylinder.
Claims17
A printing apparatus comprising:
- an ink fountain for containing a quantity of ink;
- a fountain roll for picking up ink from said ink fountain;
- a first distributor roll;
- a movable ductor roll for transferring ink from said fountain roll to said first distributor roll, said ductor roll having a first position in rolling engagement with said fountain roll to be rotated by said fountain roll at a first speed, said ductor roll having a second position spaced from said fountain roll and in rolling engagement with said first distributor roll to be rotated by said first distributor roll at a second speed greater than said first speed;
- means for moving said ductor roll between said first and second positions;
- a second distributor roll for receiving ink from said first distributor roll;
- a plate cylinder for carrying an image to be printed and to which ink from said ink fountain is transferred by said fountain roll, said ductor roll, and said first and second distributor rolls;
- a first driving means comprising a first motor for rotating said first distributor roll;
- and
- a second driving means separate from said first driving means, said second driving means comprising a second motor for rotating said second distributor roll and said plate cylinder.
7 more elements
A printing apparatus comprising:
- an ink fountain for containing a quantity of ink;
- a fountain roll for picking up ink from aid ink fountain;
- a first distributor roll;
- a movable ductor roll for transferring ink from said fountain roll to said first distributor roll, said ductor roll having a first position in rolling engagement with said fountain roll to be rotated by said fountain roll at a first speed, said ductor roll having a second position spaced from said fountain roll and in rolling engagement with said first distributor roll to be rotated by said first distributor roll at a second speed greater than said first speed, said ductor roll being supported in continuous ink transferring relationship with said first distributor roll;
- means for moving said ductor roll between said first and second positions;
- a plate cylinder for carrying an image to be printed and to which ink from said ink fountain is transferred by said fountain roll, said ductor roll, and said first and second distributor rolls;
- a second distributor roll for receiving ink from said first distributor roll;
- a first driving means comprising a first motor for rotating said first distributor roll;
- and
- a second driving means separated from said first driving means, said second driving means comprising a second motor for rotating said second distributor roll and said plate cylinder.
7 more elements
A printing apparatus comprising:
- an ink fountain for containing a quantity of ink;
- a fountain roll for picking up ink from said ink fountain;
- a first distributor roll;
- a movable ductor roll for transferring ink from said fountain roll to said first distributor roll, said ductor roll having a first position spaced from said first distributor roll and in rolling engagement with said fountain roll to be rotated by said fountain roll at a first speed, said ductor roll having a second position spaced from said fountain roll and in rolling engagement with said first distributor roll to be rotated by said first distributor roll at a second speed greater than said first speed;
- means for moving said ductor roll between said first and second positions;
- a second distributor roll for receiving ink from said first distributor roll, said second distributor roll being spaced from said first distributor roll;
- a plate cylinder for carrying an image to be printed and to which ink from said ink fountain is transferred by said fountain roll, said ductor roll, and said first and second distributor rolls;
- a first driving means comprising a first motor for rotating said first distributor roll;
- a second driving means separated from said first driving means, said second driving means comprising a second motor for rotating said second distributor roll and said plate cylinder;
- and
- a swing roll for transferring ink between said first distributor roll and said second distributor roll, said swing roll being movable between an engaged position in ink transferring relationship with both of said distributor rolls and a disengaged position in ink transferring relationship with only one of said distributor rolls.
8 more elements
A printing apparatus comprising:
- an ink fountain for containing a quantity of ink;
- a fountain roll for picking up ink from said ink fountain;
- a first distributor roll;
- a movable ductor roll for transferring ink from said fountain roll to said first distributor roll, said ductor roll having a first position in rolling engagement with said fountain roll to be rotated by said first distributor roll at a first speed, said ductor roll having a second position spaced from said fountain roll and in rolling engagement with said first distributor roll to be rotated by said first distributor roll at a second speed greater than said first speed, said ductor roll being supported in continuous ink transferring relationship with said first distributor roll;
- means for moving said ductor roll between said first and second position;
- a second distributor roll for receiving ink from said first distributor roll, said second distributor roll being spaced from said first distributor roll;
- a plate cylinder for carrying an image to be printed and to which ink from said ink fountain is transferred by said fountain roll, said ductor roll, and said first and second distributor rolls;
- a first driving means comprising a first motor for rotating said first distributor roll;
- a second driving means separated from said first driving means, said second driving means comprising a second motor for rotating said second distributor roll and said plate cylinder;
- and
- a swing roll for transferring ink between said first distributor roll and said second distributor roll, said swing roll being supported in continuous ink transferring relationship with said first distributor roll, said swing roll being movable between a disengaged position not in ink transferring relationship with said second distributor roll and an engaged position in ink transferring relationship with said second distributor roll.
8 more elements
Dependencies are inferred from the claim text.