90
m
Drum Section
chap.2
Description
At times other than printing, the ink roller is separated from the inner surface of the drum by a fixed
clearance. During printing, however, the press roller rises and presses the ink roller into contact with the
drum inner surface, so that ink is supplied via the drum inner surface to the printing paper. This mechanism
prevents ink from being supplied to the drum inner surface if the printer is run without any paper.
When the master is detached in the platemaking process, ink on the drum surface is removed along with the
document, which means that in the first printing after the master is attached, there is a possibility of
insufficient ink on the drum surface, resulting in faint images.
To prevent such ink insufficiency when in the first printing, the machine is equipped with a mechanism for
raising and lowering the ink roller. Before paper is fed in, this mechanism pushes the ink roller against the
drum inner surface, so that ink is forcibly supplied immediately prior to the start of printing. As a result, the
images on the first sheet printed after platemaking are sufficiently bold.
Ink roller up and down operations are included as elements in the Fine Start mode, and therefore are
optimally controlled in accordance with room temperature, length of time out of use, number of sheets in last
run, etc.
Circuit
(2) Ink Roller Up/Down Mechanism
R8S02E31e
Summary of Contents for DP-S Series
Page 1: ......
Page 9: ......
Page 11: ......
Page 16: ...x Dimensions chap 1 15 R8S01001 xDimensions 622 1360 510 228 1080 710 980 688 370 mm...
Page 22: ...v Part Names and Their Functions chap 1 21 44000A1e 2A 2B 2C R8S01006a 2Detailed drawing...
Page 33: ...32 z Scanner Section chap 2 Circuit R8S02E03e...
Page 87: ...86 m Drum Section chap 2 2 Circuit R8S02E30...
Page 171: ...170 MEMO...
Page 193: ...192 MEMO...
Page 195: ...194 z Help mode List chap 7 z HELP Mode List...
Page 243: ...242 c HELP Mode Function and Operation Procedures chap 7...
Page 270: ...269 c HELP Mode Function and Operation Procedures chap 7...
Page 281: ...280 MEMO...
Page 293: ...292 z Electrical Parts Layout and Their Functions chap 9 MEMO...
Page 295: ...309 294 x Overall Wiring Layout chap 9 Overall Wiring Layout 1 Main PCB 2 2...
Page 297: ...311 296 x Overall Wiring Layout chap 9 Overall Wiring Layout 2 Drive PCB 2 2...