Duplicating apparatus

Duplicating apparatus including means for transferring printed information from a master card to a receiving copy by means of the hectographic process comprising the combination of a frame, a master card carrying drum rotatable in a predetermined sense for effecting one duplication per revolution of said drum when a receiving copy is present, a main shaft extending horizontally and being journalled to said frame, said drum being of relatively large diameter and being fixedly supported to the intermediate portion of said main shaft for rotation therewith, actuating means connected to said main shaft for rotating same, whereby any number of copies can be made from a master on the drum by simply turning the drum with the master attached thereto the desired number of times while feeding separate receiving copies thereto, a pressure roll made of rubber-like material rotatably mounted to said frame on a pressure roll shaft parallel to said main shaft and vertically spaced therebelow, means for maintaining the periphery of said pressure roll in constant frictional engagement with the periphery of said drum, a feed roll made of rubber-like material rotatably mounted to said frame on a feed roll shaft located essentially forwardly of said pressure roll shaft and extending parallel thereto, drive means for interconnecting said feed roll and said pressure roll and for causing rotation of said feed roll upon rotation of said pressure roll in the same sense and at the same linear speed, a pivotable shaft mounted to said frame parallel to said main shaft and extending slightly above and slightly behind said feed roll shaft, a moistening roll yoke secured to said pivotable shaft for angular displacement therewith, a moistening roll rotatably mounted to said yoke around an axis parallel to said pivotable shaft, said moistening roll being substantially shorter than said feed roll, a pair of forwardly extending spring located nip roll levers pivotably mounted on said pivotable shaft and rotatable relative thereto, each said nip roll lever carrying a freely rotatable nip roll resiliently urged into constant engagement with said feed roll, the nip rolls and the feed roll forming a means for initially receiving the receiving copy into the apparatus and for cooperating with each other to feed the copy directly to the drum and pressure roll, a cam lever connected to said pivotable shaft and projecting rearwardly toward said main shaft, return spring means for urging said cam lever toward said main shaft, cam means secured to said main shaft for pivoting said cam lever, pivotable shaft, and yoke to raise and lower said moistening roll toward and away from said feed roll, whereby the turning movements of the main shaft are translated directly into intermittent movements of the moistening roll into and out of engagement with the feed roll to thus permit contact therewith over a substantial angular displacement of said cam means, wick means for wetting said moistening roll with solvent, stop means for controlling the starting angular position of said main shaft at the beginning of every successive revolution of said drum, and adjustment means for said stop means for varying said starting angular position to vary the angular position of the master on the drum, relative to the leading edge of the sheet, to vary the location of the master relative to the leading edge of the receiving copy.