Offset printing machine having automatically releasably clamped blanket sheet
AssigneeTokyo Electric Co., Ltd.
InventorYoshiaki Ono
Life of this patent
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Abstract
An offset printing machine having a blanket sheet wrapped around an outer circumferential surface of a blanket cylinder 3 so as to come in contact with a master and having clamps 29 and 30 for releasably retaining opposite ends of the blanket sheet to the blanket cylinder 3. After ending a printing operation, the blanket sheet is removed from the clamps 29 and 30 and dumped. Accordingly, the cleaning of the blanket cylinder 3 can be omitted to prevent hands and clothes from being stained.
Claims9
In an offset printing machine for depositing ink onto a master wrapped around an outer circumferential surface of a cylindrical master cylinder, transferring the ink deposited on the master to an outer circumferential surface of a cylindrical blanket cylinder, and transferring the ink transferred to the outer circumferential surface of a cylindrical blanket cylinder to a sheet of paper;
- the improvement comprising a blanket sheet wrapped around the outer circumferential surface of the blanket cylinder so as to come in contact with the master, and an automatically actuatable clamp means for releasably retaining opposite ends of said blanket sheet to the blanket cylinder;
- the offset printing machine further including a first passage means for feeding a blanket sheet to the blanket cylinder, a second passage means for feeding a master sheet to the master cylinder, a discharge passage means independent from said first and second passage means for receiving a blanket sheet after being released from said automatically actuatable clamp, said discharge passage means extending along a tangent to a contact portion between the master cylinder and the blanket cylinder, means for feeding a master sheet and a sheet blanket from said master cylinder and said blanket cylinder through said discharge passage means with the inked surfaces of the master sheet and blanket sheet facing each other.
A method for mounting and dismounting a blanket sheet upon a blanket cylinder in an offset printing machine comprising:
- providing a blanket cylinder clamp means for automatically clamping and unclamping opposite ends of a blanket sheet;
- feeding a blanket sheet to said blanket cylinder and automatically clamping one end thereof;
- continuing feeding of said blanket sheet until the blanket sheet is disposed about the blanket cylinder and then automatically clamping the other end of the blanket sheet;
- and
- after a printing operation, automatically releasing an end of the blanket sheet and feeding said sheet into a discharge passageway adjacent to said blanket cylinder;
- the method further including providing clamping means for automatically clamping and releasing a master on a master cylinder, and unclamping the master sheet substantially at the same time as the blanket sheet such that said blanket sheet and master have inked surfaces facing each other;
- and
- discharging said master and blanket sheets through said discharge passageway with their inked surfaces facing each other.
Dependencies are inferred from the claim text.