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Gripper and ejector elements are separately cammed for coaxial movement so as to receive and retain a sheet against the surface of a drum while enhancing sheet stripping as the drum rotates.
English (United States)
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Gripper and ejector elements are separately cammed for coaxial movement
so as to receive and retain a sheet against the surface of a drum while enhancing
sheet stripping as the drum rotates.
Drum 10 and the gripper/ejector mechanism 11 rotate around fixed shaft 12
on which are attached cam elements 15, 16 and 17, with cams 16 and 17 being
identical. L-shaped gripper edge 20 is attached to slide 21, and a cam follower
wheel 22 is attached to the outer arms of slide 21. Slide 21 is normally biased in
an outward radial direction by spring 23. Ejector 30 surrounds slide 21 and
includes pivot wheels 31 and 32 for following cams 16 and 17, respectively.
Ejector 30 is likewise biased in an outward radial direction similar to slide 21 but
by means not shown.
The sequence of operations is best understood from Fig. 2, where
gripper/ejector 11 is shown in detail in position D, but is shown symbolically as it
would appear when rotated to positions A, B and C. In this example,
gripper/ejector 11 functions to retain a flexible medium, such as a sheet of paper,
on the surface of drum 10 as it rotates through about 180 degrees. As drum 10
rotates counterclockwise, the movement of assembly 11 past radial line 35
results in the slide 21 and gripper lip 20 being cammed outward, as shown at
position A, to receive sheet 36. Cam 15 retracts gripper 20 as radial line 37 is
reached so that sheet 36 is gripped in flush relation with the outer diameter of