Method and apparatus for placement of a doctor blade against an ink-dispensing roller
First Claim
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1. A method for placement of a doctor blade against an ink-dispensing roller in a web-fed rotary press, said method comprising:
- providing at least a first doctor blade bar having at least a first doctor blade supporting base body;
resiliently supporting a first doctor blade in said doctor blade supporting base body;
moving said doctor blade along a first curved path of travel corresponding to one arm of a parabola toward an ink dispensing roller;
bringing a working edge of said doctor blade into linear contact against a surface of an ink dispensing roller at a contact point remote from a final working position of said doctor blade, said contact point being at an axis of symmetry of said parabola;
moving said doctor blade along a second path of travel along a jacket surface of an ink dispensing roller into said final working position; and
pushing said doctor blade into said doctor blade supporting base body while moving said doctor blade along said second path of travel along a jacket surface into said doctor blade working position.
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Abstract
A method and apparatus for placement of a doctor blade bar against an ink dispensing roller utilizes doctor blade supporting base bodies which have resiliently supported doctor blades and which are shiftable between rest and work positions along doctor blade base support beams by blade base shifting devices. The doctor blades are moved into engagement with the screen roller along a curved path. The resilient support of the doctor blades eliminates blade warping and possible damage to the working edge of the blades.
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Citations
20 Claims
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1. A method for placement of a doctor blade against an ink-dispensing roller in a web-fed rotary press, said method comprising:
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providing at least a first doctor blade bar having at least a first doctor blade supporting base body; resiliently supporting a first doctor blade in said doctor blade supporting base body; moving said doctor blade along a first curved path of travel corresponding to one arm of a parabola toward an ink dispensing roller; bringing a working edge of said doctor blade into linear contact against a surface of an ink dispensing roller at a contact point remote from a final working position of said doctor blade, said contact point being at an axis of symmetry of said parabola; moving said doctor blade along a second path of travel along a jacket surface of an ink dispensing roller into said final working position; and pushing said doctor blade into said doctor blade supporting base body while moving said doctor blade along said second path of travel along a jacket surface into said doctor blade working position. - View Dependent Claims (2, 3)
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4. Apparatus for the placement of a doctor blade supported in a doctor blade bar against an ink dispensing roller in a web-fed rotary printing press, said apparatus comprising:
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at least a first doctor blade supporting base body forming a doctor blade bar; at least a first doctor blade resiliently supported in said doctor blade bar at a negative placement angle with respect to an ink-dispensing roller; means to move said doctor blade bar initially along a first curved path of travel which correspond to one arm of a parabola until a working end of said first doctor blade engages a jacket of an ink-dispensing roller at a first angle at a contact point which is on an axis of symmetry of said parabola, and is pushed back into said doctor blade bar against a force of a biasing means, said first angle being generally perpendicular to a tangent line at said contact point of said working end of said first doctor blade with a jacket of an ink-dispensing roller, and to subsequently move said doctor blade bar along a second path of travel generally along a jacket of an ink-dispensing roller to a working position of said doctor blade wherein said doctor blade is at a negative placement angle with regard to said tangent line; transport edges provided on first portions of said doctor blade bar; and doctor blade base support beams having first and second ribs which are engageable with said transport edges when said doctor blade bar is moved by said means to initially and subsequently move said doctor blade bar. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Apparatus for the placement of a doctor blade supported in a doctor blade bar against an ink dispensing roller in a web-fed rotary printing press, said apparatus comprising:
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at least a first doctor blade supporting base body forming a doctor blade bar; at least a first doctor blade resiliently supported in said doctor blade bar at a negative placement angle with respect to an ink-dispensing roller; means to move said doctor blade bar initially along a first path until a working end of said first doctor blade engages a jacket of an ink-dispensing roller at a first angle, and is pushed back into said doctor blade bar against a force of a biasing means, said first angle being generally perpendicular to a tangent line at a contact point of said working end of said first doctor blade with a jacket of an ink-dispensing roller, and to move said doctor blade bar subsequently along a second path generally along a jacket of an ink-dispensing roller to a working position of said doctor blade wherein said doctor blade is at a negative placement angle with regard to said tangent line; transport edges provided on first portions of said doctor blade bar; and doctor blade base support beams having first and second ribs which are engageable with said transport edges when said doctor blade bar is moved by said means to initially and subsequently move said doctor blade bar, said means including a blade base shifting assembly secured to each of said doctor blade base support beams and having a rotatable body with two angled, fork shaped ends and wherein said rotatable body is rotatably seated in said doctor blade bar support beam by a dowel screw.-.
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20. A method for placement of a doctor blade against an ink-dispensing roller in a web-fed rotary press, said method comprising:
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providing at least a first doctor blade bar having at least a first doctor blade supporting base body; resiliently supporting a first doctor blade in said doctor blade supporting base body; moving said doctor blade bar initially along a first curved path of travel until a working end of said first doctor blade is engaging a jacket of an ink-dispensing roller at a first angle, and forcing said first doctor blade back into said doctor blade bar against a force of a biasing means, said first angle being generally perpendicular to a tangent line at a contact point of said working end of said first doctor blade with a jacket of an ink-dispensing roller, moving said doctor blade bar subsequently along a second path and moving said working end of said first doctor blade generally along a jacket of an ink dispensing roller to a working position of said doctor blade; and terminating said movement of said doctor blade bar along a jacket of an ink dispensing roller when said working doctor blade has taken up a negative placement angle against a jacket of an ink dispensing roller.
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Specification