Printing – Multicolor – Rotary machines
Patent
1987-02-02
1989-05-30
Fisher, J. Reed
Printing
Multicolor
Rotary machines
101248, B41F 506, B41F 1312
Patent
active
048339830
ABSTRACT:
This invention relates to an adjusting apparatus for adjusting the speed of a plate roller relative to a pressing roller for achieving registration between a plurality of printing means comprising a driving shaft at one end of which is a pressing roller. The adjusting apparatus further includes first and second transmission gear wheels, both of which are mounted on a transmission shaft. The first transmission gear wheel engages a main gear wheel which may be coupled to the driving shaft by a first clutch. The second transmission gear wheel engages an adjustment gear wheel which may be coupled to the driving shaft by a second clutch. First and second clutches are electrically operated such that only one clutch is operative at any time. Thus, when the first clutch is engaged, the main gear wheel is coupled to the driving shaft and drives the first transmission gear wheel and a plate cylinder driven gear wheel to drive the plate cylinder at a first speed. Alternately, when the second clutch is engaged, the adjustment gear having less teeth than the main drive gear, is coupled to the driving shaft and therefore powers the second transmission gear wheel which in turn is coupled to the first transmission gear wheel, driving the main gear wheel and the plate cylinder driven gear. Thus, the plate cylinder is now operated at a second speed by virtue of the gear ratio between the adjustment gear wheel and the second transmission gear wheel.
REFERENCES:
patent: 3742849 (1973-07-01), Greiner
patent: 4363270 (1982-12-01), Ury et al.
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