| 摘要 |
Auxiliary form roller apparatus is provided for rotary offset lithographic duplicating machines to increase the number of form rollers and more uniformly distribute the ink over the master cylinder. The apparatus has a frame formed by a pair of oppositely-disposed, substantially J-shaped support arms which are separated and joined by laterally extending support members. One end of each support arm is bifurcated to receive the main frame support rod of the duplicating machine and the other end of the arm is slotted to slidably receive and support one of the end bearings of a rotatable, auxiliary form roller which is disposed between the arms and is adapted to bear against the master cylinder at a location which is spaced a peripheral distance from the existing form rollers of the machine. A laterally-oscillating, rotatable auxiliary oscillator roller is swingably mounted on the support arms and is so disposed as to engage the auxiliary form roller and one of the existing form rollers of the machine to provide for uniform ink transfer from the existing form roller to the auxiliary form roller. The frame arms are apertured between the ends thereof to receive a laterally-extending, eccentric adjusting rod which also passes through and is supported by a pair of mounting blocks which are adapted to be secured to the main frame members of the duplicator to support the apparatus. Rotatable eccentric bearings are provided for the adjusting rod so that the axis of the auxiliary form roller may be suitably adjusted with respect to the axis of the master cylinder to provide a uniform line contact between the auxiliary form roller and the master cylinder.
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