Identifier: modernmechanisme00benj (find matches)
Title: Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics
Year: 1892 (1890s)
Authors: Benjamin, Park, 1849-1922
Subjects: Mechanical engineering
Publisher: New York, D. Appleton
Contributing Library: Mugar Memorial Library, Boston University
Digitizing Sponsor: Boston University

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ving forward again. The frame of this press is extended upwardso as to provide bearings over the travel of the bed for the rolls carrying the wiping cloths.These cloths extended from one roll down under what is termed a pad, and then upward to 664 PRESSES, PRINTING. another roll; the rolls beinja: intermittently moved, one to unroll a small portion of the cloth, and the other to roll up a like portion, thereby presenting a fresh wiping surface below thepad. There are a number of these pads extending transversely across the machine so as tobear the cloths upon the plate as the latter travels beneath them. These pads were given aconstant transverse reciprocating motion, so that tlie cloths were rubbed over the surface ofthe inked plate as the bed moves forward into the j)lane of impression with the cylinder. Theplate is kept constantly heated by gas jets burning below the bed ; and in some cases one ormore of the wiping cloths is dampened by passing the cloth through a water trough, the
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amount of water absorbed thereby being regulated by a squeezing roll ; and finally the lastpad, or the one nearest the impression cylinder, has or may have its cloth omitted and the chalkapplied to its under surface so as to give the final polish to the plate just before printing ;the cloth also in some cases is emploved with this pad, and in this case the cloth has chalkautomatically applied to it instead of to the pad. The sheets to be printed are fed by a girlfrom the usual feed-board to the grippers of the impression cylinder, and after being printedupon are delivered in the usual manner. This flat-bed plate-printing machine has met with great success in printing many diflficult PRESSES, DRAWING. 665 plates entirely automatic, arid has lately been used by the United States Government withgreat success for printing the cigar and beer internal revenue stamps, which are considered avery severe test on the automatic inking and wiping features of the machine. The art of plate printing

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