Engraver, Machine
Overall rating: (N/A)
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Sets up and operates engraving mcahine to transfer designs
from mills to copper printing rollers used in color-printing
cloth: Lifts printing roller into position on machine with aid
of another worker. Places truing I rloler in fixture on head of
machine and lowers machine head until truing roller rests on
surface of printing roller. Starts machine to rotate truing
roller against printing roller and turns setscrews until truing
roller rotates without horizontal motion to align head of
machine with printing roller. Divides register wheel on machine
into divisions, according to nmuber of times design is to be
repeated around printing roller, and marks divisions on wheel,
using chalk. Inserts stud in specified slot on register wheel,
replaces truing roller with mill, and moves pitch finger against
stop on head of machine to set mill in register for engraving.
Lowers mill to surface of printing roller, releases catch on
weight lever to apply pressure on mill, and rotates mill one
revolution to transfer one repeat of pattern to roller. Repeats
procedure until design has been repeated around circumference of
printing roller. Examines impression of design on roller to
detect repeats of pattern that are out of register. Replaces
mill with burnishing roller and works burnishing roller agaisnt
printing roller to erase defective impressions.
Increases
pressure on mill if design is in register and starts machine
that works mill against printing roller to raise depth of
impression. Measures depth of engraving, uisng depth gauge.
Measures wdith of embossed design on mill, using divider, and
converts measurement into number of teeth on side-shift gear,
using conversion tables.
Releases pressure on mill and turns
gear specified number of teeth to move mill into position for
engraving design adjacent to first impression and repeats
procedure as above until design has been engraved across length
of roller. Engages dog in teeth of gear and pitches design in
register. Repeats procedure until design has been engraved
arcoss length of roller. Mounts engraved rloler on mandrel of
polishing lathe and operates lathe to remove burrs and smooth
roller [Printing-Roller Polisher (machine shop)].
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Engraver, Machine
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