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A simplified impression control device which allows a predictable adjustment of type element free flight is illustrated in Figs. 1 and 2.
English (United States)
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This is the abbreviated version, containing approximately
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Impression Control for a Single Element Printer
A simplified impression control device which allows a predictable adjustment
of type element free flight is illustrated in Figs. 1 and 2.
The print cam 10, which rotates to cause movement of the rocker 12, is
shown engaged with print cam follower 14. Print cam follower 14 is pivotally
attached to rocker 12 at pivot 16 to provide an output for the motion of cam
follower 14. Cam follower 14 is engaged on its underside with fulcrum surface 18. Fulcrum surface 18, attached to impression shift lever 20, is supported on an
adjustable stud 22, which is in turn screwed into support member 24.
The raising and lowering of stud 22 will control the at-rest position of rocker
12 and thus the starting point of driven flight of rocker 12. By raising stud 22, the
amount of free flight, that movement of rocker 12 after cam 10 and follower 14
disengage due to dynamics, will be reduced. Inasmuch as the fulcrum surface
for fulcrum 18 is radial about the fulcrum pivot whenever the rocker 12 is in its
maximum powered position (just before free-flight begins), adjustment of the
screw 28 changes the start point of free-flight and the rest position of the rocker
together but does not change the powered stroke.
Impression control lever 20 may be then manually shifted by the operator
after the single screw adjustment to change the rate and thus increase or
decrease the powered drive stroke or the impact force of the type element onto