Printing – Inkers – Roller
Patent
1994-02-16
1995-01-24
Fisher, J. Reed
Printing
Inkers
Roller
101DIG32, B41F 3114, B41F 3138
Patent
active
053833945
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to apparatus for supplying ink to printing machines, and more particularly to an apparatus for supplying ink to printing machines which comprises an ink fountain roller, an ink distributing roller and a plurality of vibrating rollers divided axially of these rollers and arranged therebetween, each of the vibrating rollers being individually positionable alternatively at one of two positions between the rollers so as to be changeable in the state of contact thereof with the ink fountain roller and the ink distributing roller.
BACKGROUND ART
Such ink supply apparatus for printing machines are already known in which each of the vibrating rollers is rotatably mounted on the movable end of a pivotal arm. By moving the pivotal arm as by an air cylinder, the vibrating roller is shiftable to a first position in which the roller is in contact with the ink fountain roller and away from the ink distributing roller, or alternatively to a second position in which the vibrating roller is in contact with the ink distributing roller and away from the ink fountain roller.
However, the conventional ink supply apparatus described requires groups of pivotal arms for changing over the position of the vibrating rollers and therefore has the problem of necessitating a large space for the installation of the arrangement.
An object of the present invention is to overcome the above problem and to provide an ink supply apparatus for printing machines which is reduced in the installation space for the vibrating rollers.
DISCLOSURE OF THE INVENTION
The apparatus of the invention for supplying ink to a printing machine comprises an ink fountain roller and an ink distributing roller supported by a frame so as to be parallel to each other, and a plurality of vibrating rollers divided axially of the rollers and disposed therebetween as arranged at a spacing axially thereof, each of the vibrating rollers being individually positionable alternatively at one of two positions between the rollers so as to be changeable in the state of contact thereof with the ink fountain roller and the ink distributing roller, the ink supplying apparatus being characterized in that a fixed shaft fixed to the frame extends through interiors of the plurality of tubular vibrating rollers with a clearance therebetween in the radial direction, a permanent magnet being provided on an inner peripheral portion of each of the vibrating rollers, a magnetic device including an electromagnet being individually provided on an outer peripheral portion of the fixed shaft inside each of the vibrating rollers, each of the vibrating rollers being individually positionable alternatively at one of the two positions in the state where the permanent magnet of the vibrating roller and the magnetic device of the fixed shaft are individually opposed to each other with a predetermined clearance therebetween in the radial direction by the change-over of the state of current supply to the electromagnet of each magnetic device.
The adjacent vibrating rollers may be connected together end-to-end by a flexible tubular portion having a small wall thickness.
The tubular permanent magnet is fixed to the inner peripheral portion of each of the vibrating rollers. The magnetic device comprises the substantially tubular permanent magnet and the electromagnet, the permanent magnet being fixed to the outer peripheral portion of the fixed shaft and being partially cut out, the electromagnet being fixed to the outer peripheral portion of the fixed shaft at the position of the cut-out portion. The position of the vibrating roller may be changed over by a change-over of the state of current supply to the electromagnet of each magnetic device.
Tubular permanent magnets for positioning the vibrating rollers are fixedly provided in the axial direction outside the vibrating rollers at both ends. The vibrating rollers are axially positionable by mutual repellent force between the respective permanent magnets of the vibrating rollers and repellent force fr
REFERENCES:
patent: 4632029 (1986-12-01), Simeth
patent: 4987831 (1991-01-01), Weder
Fisher J. Reed
I. mar Planning, Inc.
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