Rotary press

Details Rotary press Rotary press

1999-11-08

2001-10-09

Yan, Ren (Department: 2854)

Printing

Inkers

Roller

C101S148000

Reexamination Certificate

active

06298779

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary press having a printing unit for printing picture on a web fed by a paper feeder.
2. Description of Related Art
As shown in
FIG. 4
, a general offset rotary press
1
has a paper feeder
2
for feeding consecutive web W, a delivery device
3
for delivering the web W from the paper feeder
2
to downstream (in right direction in the figure), a printer
5
including a plurality of printing unit
5
A to
5
D having blanket cylinder
4
etc. thereinside for printing picture on the web W delivered by the delivery device
3
, a drier
6
for drying ink distributed on the printed web W, a cooler
7
for cooling the web W sent from the drier
6
, and a folding machine
8
for cutting and folding the web W.
As shown in
FIG. 5
, the respective printing units
5
A to
5
D (represented by the printing unit
5
A hereinafter) of the rotary press
1
include a print cylinder
50
having printing form, the blanket cylinder
4
for printing on the web W by being transferred with ink from the print cylinder
50
, a ink furnishing unit
51
for feeding the ink to the print cylinder
50
, and a water feeder
61
for feeding water to the print cylinder
50
.
Incidentally, the print cylinder
50
, the ink finishing unit
51
and the water feeder
61
are provided on the printing unit
5
A to upper and lower side of the web W for double-side printing of the web W.
The ink furnishing unit
51
includes an ink fountain
52
for storing the ink, an ink fountain roller
53
for drawing the ink out from the ink fountain
52
, an ink key (not shown) for adjusting ink draw amount by the ink fountain roller
53
, and an ink ductor
55
for transferring the ink from the ink fountain roller
53
to downstream ink transferring rollers
54
.
The ink transferring rollers
54
include a plurality of ink distributing roller
56
, a plurality of ink smoothing roller
58
and a plurality of ink form roller
59
. The ink drawn out by the ink fountain roller
53
is kneaded and leveled while passing the rollers
54
and is fed to the print cylinder
50
.
The water feeder
61
includes a water fountain
62
, a water fountain roller
63
for drawing water out from the water fountain
62
, a dampening roller
64
for transferring the water from the water fountain roller
63
, a water form roller
65
for applying the water to the print cylinder
50
, and a water rider
66
, the dampening roller
64
, the form roller
65
and the rider
66
forming the water transferring rollers
67
. The water drawn out by the water fountain roller
63
is leveled while passing the water transferring rollers
67
and is fed to the print cylinder
50
.
The drive of the ink transferring rollers
54
and the water transferring rollers
67
is conventionally transmitted from a main motor to respective printing units
5
A to
5
D through a line shaft. The drive is transmitted to printing cylinders such as the print cylinder
50
by a bevel gear etc., wherefrom the drive is transmitted to the ink transferring rollers
54
and the water transferring rollers
67
through a clutch
70
and an idler gear
71
, and further through a gear cooperative mechanism
72
as shown in a driving system of FIG.
6
.
When the ink transferring rollers
54
are driven, the drive from the clutch
70
and the idler gear
71
is transmitted to a gear
73
A coaxial with one of the three ink smoothing rollers
58
. A gear
74
is meshed with the gear
73
A and a timing pulley
75
is provided coaxially with the gear
74
. When a rotation of the gear
73
A is transmitted to the gear
74
and the other three gears
73
, the four ink smoothing rollers
58
are rotated and the ink transferring rollers
54
such as the ink distributing roller
56
are dragged to be rotated as shown in FIG.
5
.
The gear cooperative mechanism
72
is composed including the gear
73
A,
73
,
74
and the timing pulley
75
. The ink fountain roller
53
is driven by an ink fountain roller driving motor (not shown).
When the water transferring rollers
67
are driven, the form roller
65
is rotated by meshing the clutch
70
and a water driving gear
77
coaxial with the water form roller
65
and the water rider
66
is dragged to be rotated by the rotation.
Incidentally, the water fountain roller
63
is driven by a driving motor (not shown).
However, following disadvantages occur in driving the ink transferring rollers and the water transferring rollers of the conventional rotary press.
First, since the ink transferring rollers
54
and the water transferring rollers
67
are driven by the line shaft driven by a main motor and the gear cooperative mechanism connected to the line shaft, the ink transferring rollers
54
and the water transferring rollers
67
are driven at a rate proportional to a peripheral speed of the print cylinder. In order to change the peripheral speed of the respective rollers
54
and
67
, the number of teeth of the gear has to be changed or roller diameter has to be changed, which is difficult. Accordingly, doubling and hickey, which can be prevented by changing the peripheral speed, are likely to be caused, thereby preventing the print quality from being improved.
Second, since the ink transferring rollers
54
and the water transferring rollers
67
are driven by the gear cooperative mechanism connected to the line shaft, the respective rollers
54
and
67
cannot be independently driven and suspended without driving or suspending the printer body. Accordingly, an ink film is not formed on the ink transferring rollers
54
and emulsified status is not generated on the water transferring rollers
67
in advance and such process has to be conducted in initiating printing process. Therefore, extra web W is used before generating the ink film and the emulsified status, which increases paper spoilage.
Third, since the drive is transmitted and shut between; the ink transferring rollers
54
and the water transferring rollers
67
; and the printer body side by switching the clutch, both rollers
54
and
67
cannot be separately driven. Accordingly, when both of the rollers
54
and
67
or either one of the rollers has to be run idle for maintenance etc., the printer body has to be actuated. In this case, since the web W sandwiched between the blanket cylinders
4
will be fed, extra portion of the web W has to be cut. Consequently, the web W has to be inserted between the blanket cylinders, which is troublesome and deteriorates efficiency of printing process since the clutch has to be set on and off to deteriorate operability.
Fourth, the peripheral speeds of the print cylinder and the water form roller preferably have a difference in order to remove the hickey as the printing failure. On the other hand, in printing on a rough paper etc., paper dust or the like may be raised when there is a peripheral speed difference and the paper dust is likely to adhere on the surface of the water form roller, thereby hindering printing with good quality. However, since the water transferring rollers
67
cannot be driven with variable speed in the conventional drive, the peripheral speed of the water rollers cannot be changed freely in accordance with the paper. Accordingly, it is difficult to print on printing papers having different paper quality (e.g. coated paper and rough paper), thereby hindering improvement of printing quality.
The above problems occur because the rollers are mechanically driven. Accordingly, an electrically controlled driving means
88
can be designed as shown in FIG.
7
.
In this arrangement, when the individual member (such as first roller and ink form roller) is independently speed-proportionally-operated in proportion to a predetermined standard (spindle rotation), speed of the standard is detected by a rotational frequency detecting device
80
and spindle rotational frequency is outputted to an electric motor controller
81
by a ratio setting device
82
as a speed command defined in proportion to the first axis rotation speed. The electric motor

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