Operating lever mechanism for offset printing press
AssigneeRyobi Ltd.
InventorsKoji Ishii, Naoki Ikeda
Life of this patent
Estimating the term…
Abstract
An offset printing press having an operating lever mechanism which is capable of controlling sequential printing operations by manipulating a single operating lever. The offset printing press includes an inking roller system and a dampening roller system. The inking roller system is supported to a first pair of frames, while the dampening roller system is supported to a second pair of frames pivotable relative to the first pair of frames. The operation lever provides pivotal motion of the second pair of frames for selectively applying water to a plate cylinder from the dampening roller system. Further, rollers in the dampening roller system are movable toward and away from each other.
Claims8
An offset printing press having a plate cylinder, a blanket cylinder, an impression cylinder, a paper feed mechanism including a suction foot and a pump drive motor for generating negative pressure in the suction foot, a printer drive motor, an inking roller system, a dampening roller system, the inking roller system including ink applicator rollers in contact with the plate cylinder, and the dampening roller system including a fountain roller, a metering roller in rotational contact with the fountain roller, a water distributor roller in rotational contact with the fountain roller, a water delivery roller in rotational contact with the water distributor roller, and a water applicator roller in rotational contact with the water delivery roller for applying water to the plate cylinder, each of said cylinders having a shaft and each of said rollers having an axis about which it may be rotated, the offset printing press comprising;
- a first pair of frames for rotatably supporting said inking roller system and for rotatably supporting said water delivery roller, said water applicator roller, said plate cylinder, said blanket cylinder, and said impression cylinder;
- a second pair of frames for rotatably supporting said metering roller, and said water distributor roller, said second pair of frames being pivotally connected to said first pair of frames by pivot pins, said pivot pins being aligned to define a pivoting axis, the axis of rotation of said fountain roller being coaxial with said pivoting axis defined by said pivot pins;
- first biasing means connected between said first and second pair of frames for normally urging said second pair of frames toward a first direction so that said water distributor roller on said second pair of frames is brought into contact with said water delivery roller;
- an operation shaft rotatably extending through said first pair of frames;
- an operating lever fixedly connected to said operation shaft;
- a drive source drivingly connected to said fountain roller for rotating said fountain roller about its axis of rotation;
- gear trains for driving said metering roller and said water distributor roller to rotate, each about its axis of rotation, in cooperation with said fountain roller;
- a positioning cam member fixedly connected to said operation shaft for defining a plurality of tilting stages of said operating lever;
- a plurality of cam members rotatably supported by said first pair of frames;
- abutting members connected to said second pair of frames, said cam members being abuttable on said abutting members;
- and
- a plurality of first link members each having first and second end portions said first end portion being rotatably connected to said operation shaft and said second end portion being rotatably connected to one of said cam members, so that said cam members may be brought into abutment with said abutting members to pivot said second pair of frames in a second direction against the biasing force of said first biasing means, so that said water distributor roller is moved away from said water delivery roller.
Dependencies are inferred from the claim text.