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US 4,054,685 AGranted
Method and apparatus for making wiping cylinder of steel engraving printing press
AssigneeDe La Rue Giori S.A.
InventorGualtiero Giori
Life of this patent
Estimating the term…
Abstract
A wiping cylinder is coated with a synthetic resin plastic composition by rotating the cylinder downwardly past a straight-edge blade on which the plastic composition is supplied so that a thin uniform layer is spread onto the cylinder. The blade is progressively retracted from the cylinder so that successive layers are applied to provide the desired total thickness. Provision is made for first heating and then cooling a layer after it has been applied.
Claims13
A method of making a wiping cylinder of a steel engraving press which comprises the steps of
- a. providing a metal base cylinder, covering said cylinder with a layer of rubber of uniform thickness,
- b. mounting said cylinder for rotation about its longitudinal axis with said axis horizontal,
- c. mounting a straight doctor blade horizontally at one side of said cylinder for micrometric movement toward and away from said cylinder, said blade extending parallel to the cylinder the full length of said cylinder,
- d. bringing said blade into engagement with the periphery of said covered cylinder,
- e. retracting said blade micrometrically while keeping it parallel to the cylinder to provide a predetermined small uniform space between said blade and cylinder, said space extending the full length of said cylinder,
- f. supplying heat-hardenable plastic composition to the upper side of said blade while rotating said cylinder slowly in a direction to cause its periphery to move downwardly past said blade to thereby apply to said cylinder a thin uniform layer of said composition having a thickness determined by said space between said blade and said cylinder,
- g. discontinuing the supply of said composition to said blade and continuing rotation of said cylinder with said blade in said position to smooth said layer without applying additional plastic composition,
- h. removing said blade from said cylinder, and rotating said coated cylinder while applying to said cylinder simultaneously throughout its length radiant heat to effect predetermined hardening of said layer.
5 more elements
Apparatus for coating a wiping cylinder of a steel engraving press with a plastic composition comprising:
- a. means for mounting a rubber covered metal base cylinder for rotation about it longitudinal axis with said axis horizontal,
- b. a straight blade extending the full length of said cylinder and having a straight edge presented to said cylinder,
- c. means mounting said blade horizontal at one side of said cylinder for movement toward and away from said cylinder while maintaining said straight edge parallel to the axis of said cylinder,
- d. means for moving said blade into engagement with the periphery of said rubber covered cylinder and for then micrometrically retracting said blade to provide a predetermined small uniform space between said blade and said cylinder said space extending the full length of the cylinder,
- e. means on the upper side of said blade for receiving a supply of heat-hardenable plastic composition and bringing said composition into engagement with the periphery of said cylinder,
- f. means for rotating said cylinder slowly in a direction to cause its periphery to move downwardly past said blade to thereby apply to said cylinder a thin uniform layer of said composition having a thickness determined by said space between said blade and cylinder,
- g. means for discontinuing the application of said composition to said cylinder while continuing to rotate said cylinder with said blade in position to smooth said layer without applying additional plastic composition, and
- h. means for applying radiant heat to said cylinder throughout its length, as said cylinder is rotated to effect predetermined hardening of said layer.
5 more elements
Dependencies are inferred from the claim text.