Winding – tensioning – or guiding – Unwinding – With supply coil replenishment
Reexamination Certificate
2003-01-30
2004-05-25
Jillions, John M. (Department: 3654)
Winding, tensioning, or guiding
Unwinding
With supply coil replenishment
C242S563100, C242S592000, C242S596100, C242S596800
Reexamination Certificate
active
06739546
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an axial-position adjustment apparatus for an arm shaft equipped with paper roll support arms in a paper web feed unit, adapted to adjust the axial position of the arm shaft so as to adjust the axial position of a side edge of paper web to fall within a predetermined range.
2. Description of the Related Art
Conventionally, a paper web feed unit of a rotary printing press is loaded with one to three paper rolls. As shown in
FIGS. 4 and 5
, a paper web feed unit R of a rotary newspaper-printing press includes an arm shaft
01
rotatably supported by frames F
1
and F
2
, and pairs of paper roll support arms A
1
and A
2
mounted on the arm shaft
01
such that the paired paper roll support arms A
1
and A
2
face each other with a predetermined interval established therebetween. A paper roll M is supported between end portions of the paper roll support arms A
1
and A
2
.
Center cones C
1
and C
2
are provided at the corresponding end portions of the paper roll support arms A
1
and A
2
while facing each other on the same axis. One center cone C
1
is provided in an axially fixed condition, whereas the other center cone C
2
is provided in an axially movable condition. Conical portions of the center cones C
1
and C
2
are inserted into opposite end opening portions of a tubular paper core of the paper roll M, thereby rotatably supporting the paper roll M by the paper roll support arms A
1
and A
2
.
Since the diameter of an opening portion of the tubular paper core varies greatly among paper rolls M, the insertion depth of a conical portion of the axially fixed center cone C into the opening portion of the tubular paper core is not constant. The axially protrudable center cone C
2
presses the paper roll M toward the axially fixed center cone C
1
, thereby causing the paper roll M to move toward the center cone C
1
. Therefore, the position of the paper roll M in the axial direction (in the width direction) varies.
Therefore, a side edge E of the paper roll M thus supported by the paper roll support arms A
1
and A
2
may shift axially beyond a predetermined range. In order to adjust the axial position of the side edge E to fall within the predetermined range, an arm-shaft axial-position adjustment apparatus (hereinafter called as an “axial-position adjustment apparatus) K
02
is used for axially moving the arm shaft
01
on which the paper roll support arms A
1
and A
2
are mounted.
Electric devices for controlling a center cone actuator, a tension control brake, and the like are provided on the paper roll support arms A
1
and A
2
. Electricity is supplied to these electric devices from slip ring units S
01
and S
02
provided separately from each other at the opposite sides of the arm shaft
01
.
The above-described conventional axial-position adjustment apparatus K
02
is described in, for example, “Newspaper Printing Handbook,” edited by The Technical Committee of The Japan Newspaper Publishers & Editors Association, published by The Japan Newspaper Publishers & Editors Association, Apr. 10, 1997, pp. 101-103. As shown in
FIG. 5
, the axial-position adjustment apparatus K
02
is provided at one end portion of the arm shaft
01
in the paper web feed unit R, whereas an arm-shaft-rotating apparatus (hereinafter called a “shaft-rotating apparatus”) K
01
for imparting an angular displacement to the paper roll support arms A
1
and A
2
is provided at the other end portion of the arm shaft
01
.
The axial-position adjustment apparatus K
02
is also described in “Newspaper Printing,” edited by The Engineering Committee of The Japan Newspaper Publishers & Editors Association, published by The Japan Newspaper Publishers & Editors Association, Oct. 31, 1980, pp. 65 and 66.
The axial-position adjustment apparatus K
02
will be described in detail with reference to FIG.
6
. The arm shaft
01
has a diameter-reduced shaft end portion
011
, which is integral with the remaining portion of the arm shaft
01
via a step. The arm shaft
01
is rotatably and axially movably supported, via a sleeve
02
, in a shaft hole formed in a casing B attached to an unillustrated frame. A male screw
011
a
is formed on an end part of the shaft end portion
011
located within the casing B.
A sleeve
03
having a radially inward protruding flange
03
a
is inserted into the shaft hole of the casing B. A slide key provided on the wall of the shaft hole prevents rotation of the sleeve
03
while allowing axial movement of the sleeve
03
.
The arm shaft
01
is rotatably inserted into the bore of the sleeve
03
; the shaft end portion
011
is inserted into the bore of the radially inward protruding flange
03
a
; and the end face of the radially inward protruding flange
03
a
is in contact with the step of the arm shaft
01
.
An annular male screw member
04
greater in diameter than the sleeve
03
is bolted to the radially inward protruding flange
03
a
. The thus-bolted annular male screw member
04
and the radially inward protruding flange
03
a
are sandwiched between the step of the arm shaft
01
and a nut
05
engaged with the male screw
011
a
of the shaft end portion
011
of the arm shaft
01
, to thereby be axially immovable in relation to the arm shaft
01
.
A worm wheel
07
having a female screw
06
formed on its bore is provided within the casing B coaxially with the arm shaft
01
in a rotatable, axially immovable condition, while being engaged with a worm
08
to be rotated.
The annular male screw member
04
is engaged with the female screw
06
of the worm wheel
07
.
When the worm
08
engaged with the worm wheel
07
is rotated by a motor
09
(FIG.
4
), the female screw
06
of the worm wheel
07
rotates. The annular male member
04
, which, together with the sleeve
03
, is nonrotatable, converts rotation of the female screw
06
to an axial movement of the annular male member
04
, thereby axially moving the arm shaft
01
via the sleeve
03
.
Electric devices provided on the paper roll support arms A
1
and A
2
receive electricity from the slip ring units S
01
and S
02
provided separately from each other at the opposite sides of the arm shaft
01
. Since the axial-position adjustment apparatus K
02
is provided at the shaft end portion
011
of the arm shaft
01
, whereas the shaft-rotating apparatus K
01
is provided at the other end portion of the arm shaft
01
, the slip ring unit S
01
is provided within a narrow space between the frame F
1
and the paper roll support arm A
1
, and the slip ring unit S
02
is provided within a narrow space between the frame F
2
and the paper roll support arm A
2
.
Conventional axial-position adjustment apparatuses such as those described above involve the following problems.
Since the axial-position adjustment apparatus is provided at an end portion of an arm shaft opposite the end portion at which a shaft-rotating apparatus is provided, space for mounting a slip ring unit is limited. Meanwhile, in recent years, demand for high-speed color printing of newspapers has been increasing in newspaper publishing companies. Thus, rotary newspaper-printing presses have been required to provide precision tension control on paper web in order to maintain or enhance printing quality in high-speed printing.
In order to meet the demand, a large number of control devices required for precision tension control on paper web are provided on paper roll support arms in a paper web feed unit, thereby increasing the number of wiring lines for electricity supply. Therefore, a slip ring unit for a large number of wiring lines must be mounted. However, such a slip ring unit requires wide space along the axial direction of the arm shaft, but the conventional axial-position adjustment apparatuses fail to provide such wide space for mounting the slip ring unit.
SUMMARY OF THE INVENTION
An object of the present invention is to solve the above-mentioned problem involved in the conventional axial-position adjustment apparatuses and to provide an axial-position adjustm
Jillions John M.
Tokyo Kikai Seisakusho Ltd.
Westerman Hattori Daniels & Adrian LLP
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