Adjustment structure for master holder

Claim 1

In a duplicating machine, a carrier having a frame and a support surface overlaid by a master sheet, the carrier being cyclically operable to move the support surface and master sheet along a predetermined travel path in a predetermined direction for transferring images from the master sheet to a copy sheet, the carrier having a holding assembly for retaining an end of the master sheet, a bar mounted on the carrier frame, and a beam having opposite end portions and a central portion connected to the bar at a fixed pivot point, which beam supports the master sheet end holding assembly the improvement in drive means for pivoting the beam relative to the bar to angularly adjust the position of the master sheet relative to the carrier support surface comprising: a first rotatable cam projecting from the bar on one side of the pivotable connection between the bar and the beam, said first cam including a first post journalled in the bar and first boss eccentrically extending from said first post, and a second rotatable cam projecting from the bar on the opposite side of said pivotable connection, said second cam including a second post journalled in the bar and a second boss eccentrically extending from said second post, a first cam follower on one end portion of the beam for operatively engaging said first cam and a second cam follower on the opposite end portion of the beam for operatively engaing said second cam, said first cam follower being maintained in continuous engagement with said first cam and said second cam follower being maintained in continuous engagement with said second cam, and an adjustor connected to said first and second cams and having a knob mounted on the carrier outboard of the master sheet travel path said adjustor including a transversely extending first link integral with said first post and a transversely extending second link integral with said second post and a third link connecting said respective first and second links for translating linear movement of said knob into rotational movement of said cams whereby the beam opposite end portions are driven in the same rotational direction.