Reprex ll-No impression?

Photo show Cap W, 72 pt next to Boxcar base.A couple of months back, I took off the gear racks, one side at a time and cleaned off 40 years of ink, grime and paper dust. All are back on in exactly the same position and tightened down with hex head screws. Nothing was dis-assembled from the roller carriage. Now, when the carriage in on impression and not tripped off impression, (the other lever), there is an space of 1/8″ between impression cylinder and type-high. Anyone have any ideas what may be wrong? This press is in a college setting and has been used since I worked on it.

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Paul Moxon, Moderator
16 years ago

Perhaps there is too much packing on the cylinder. I tallied what you told us:

.024 four sheets of tympan
.006 one top sheet
.005 mylar draw sheet
.030 Red board
.065 Total packing
Plus the thickness of paperstock

The Reprex manual (page 2) says the cylinder undercut is normally .040″, but could it be .070″? (You should be able to see the number stamped into the cylinder when the carriage is at the feed board.)

Too much packing would cause the cylinder to shift into trip when contacting a type-high form. See the 3rd paragraph of Scott Fisk’s post about his Reprex:

Eric Holub
16 years ago

Did the students remove 1/8″ of packing? Or remove a galley-height plate?

Paul Moxon, Moderator
16 years ago

By “end” I assume that you mean the cover plate? This merely protects the carriage mechanisms from damage and dirt. It will be useful for you to remove it and see how the trip mechanism works, or in this case how it doesn’t. Please take a photo of this area and we’ll go from there.

Mike Day
Mike Day
16 years ago

Sorry, I misunderstood. Yes, the smooth part is right down on the rails.

If I take off the end with impression lever to see inside, is that likely to
surprise me with a spring popping out or something falling out?

Interesting, the trip lever on the lower right when facing the handle side of the press, has always given us problems. Maybe it is worn enough that it needs a few turns on the bolt at the end of the rod on the other side. I am going up today and will report back.

Paul Moxon, Moderator
16 years ago

I’m not referring to the four carriage bearings, bur rather the smooth ends of the cylinder that contact the smooth rails above the bed. Technically, a flat bed press is only in print when these two surfaces contact. Any gap between a type high form resting on a type high bed is then derived from the cylinder undercut and is made up by packing.

I suspect that there is something loose in the linkage of the trip lever and the eccentric that raises and lowers the cylinder.

Paul Moxon, Moderator
16 years ago

Are the cylinder bearers are contacting the bed bearers in print mode?

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