U.S. patent application number 11/662793 was filed with the patent office on 2009-02-26 for methods for carrying out a flying reel change.
Invention is credited to Anton Loffler, Thomas Potzkai.
Application Number | 20090050731 11/662793 |
Document ID | / |
Family ID | 34654839 |
Filed Date | 2009-02-26 |
United States Patent
Application |
20090050731 |
Kind Code |
A1 |
Loffler; Anton ; et
al. |
February 26, 2009 |
Methods for carrying out a flying reel change
Abstract
A flying reel change is accomplished by joining an exhausting
web of a first reel that is to be replaced to a web of a fresh or
replacement reel. The fresh reel is caused to run at the speed of
the exhausting reel to be replaced prior to such joining. The
exhausting web is joined to the fresh web once the diameter of the
reel to be replaced has reached a set minimum. This minimum
diameter may be fixed by the characteristics of a core for this
exhausting reel.
Inventors: |
Loffler; Anton;
(Frankenthal, DE) ; Potzkai; Thomas; (Gerolsheim,
DE) |
Correspondence
Address: |
Douglas R. Hanscom;Jones Tullar & Cooper P.C
P.O.BOX 2266 Eads Station
Arlington
VA
22202
US
|
Family ID: |
34654839 |
Appl. No.: |
11/662793 |
Filed: |
June 2, 2005 |
PCT Filed: |
June 2, 2005 |
PCT NO: |
PCT/EP05/52543 |
371 Date: |
April 12, 2008 |
Current U.S.
Class: |
242/555.7 ;
242/555.3 |
Current CPC
Class: |
B65H 2301/41376
20130101; B65H 2515/31 20130101; B65H 2405/422 20130101; B65H
2513/108 20130101; B65H 2301/41369 20130101; B65H 19/126 20130101;
B65H 2515/31 20130101; B65H 2511/142 20130101; B65H 75/242
20130101; B65H 19/1836 20130101; B65H 2515/30 20130101; B65H
2220/01 20130101; B65H 2511/142 20130101; B65H 2220/01 20130101;
B65H 2220/01 20130101; B65H 2515/30 20130101; B65H 2220/02
20130101; B65H 2513/108 20130101; B65H 2701/18442 20130101 |
Class at
Publication: |
242/555.7 ;
242/555.3 |
International
Class: |
B65H 21/00 20060101
B65H021/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 15, 2004 |
IB |
EP20041052176 |
Claims
1-49. (canceled)
50. A method for performing a flying roll change including:
providing a first, exhausting roll of material having a first web
of material; providing a second, fresh roll of material having a
second web of material; supporting said first roll of material for
rotation at a first web speed; supporting said second roll of
material for rotation at a second web speed; determining a minimum
diameter of said first roll of material; and connecting said first
web and said second web of material when said first roll of
material reaches said minimum diameter.
51. The method of claim 50 further including providing a material
core for at least said first roll of material and determining said
minimum diameter as a function of properties of said material
core.
52. The method of claim 50 further including providing a roll
changer having material roll clamping mandrels for supporting said
first and second rolls of material and determining said minimum
diameter as a function of properties of said roll clamping mandrels
for said first roll of material.
53. The method of claim 50 further including determining said
minimum diameter of said first roll as a function of a width of
said first web of material.
54. The method of claim 50 further including providing said first
web speed greater than said second web speed, reducing said first
web speed to said second web speed and connecting said first web
and said second web at said reduced first web speed.
55. The method of claim 54 further including providing a program
and using said program for reducing said first web speed and
connecting said first web to said second web.
56. The method of claim 50 further including providing a program
and using said program for connecting said first web and said
second web.
57. The method of claim 54 further including setting said second
web speed as a function of a width of said first and second webs of
material.
58. The method of claim 51 further including setting said second
web speed during said connecting of said first and second webs of
material as a function of said properties of said material
core.
59. The method of claim 52 further including providing a material
core for at least said first roll of material and determining said
minimum diameter also as a function of properties of said material
core.
60. The method of claim 54 further including providing a material
core for at least said first roll of material and setting said
second web speed during said connecting process as a function of
geometric dimensions of said core.
61. The method of claim 51 further including determining said
minimum diameter of said first roll of material as a function of
geometric properties of said material core.
62. The method of claim 60 further including setting said second
web speed as a function of an interior diameter of said material
core.
63. The method of claim 61 further including determining said
minimum diameter as a function of an interior diameter of said
core.
64. The method of claim 60 further including setting said second
web speed as a function of a wall thickness of said core.
65. The method of claim 61 further including determining said
minimum diameter as a function of a wall thickness of said material
core.
66. The method of claim 51 further including determining said
minimum diameter as a function of a modulus of elasticity of said
material core.
67. The method of claim 52 further including setting said second
web speed during said connecting of said first web and said second
web as a function of geometric characteristics of said roll
clamping mandrels.
68. The method of claim 52 further including determining said
minimum diameter as a function of lengths of clamping jaws on said
clamping mandrels.
69. A roll changer usable for feeding a web of material comprising:
a first roll support usable to rotatably support a first,
exhausting roll of material having a first web of material; a
second roll support usable to rotatably support a second, fresh
roll of material having a second web of material; first and second
roll support receptacles on said first roll support; third and
fourth roll support receptacles on said second roll support; a
support journal on each said support receptacle; and clamping jaws
on each said support journal.
70. The roll changer of claim 69 wherein said support journals on
each of said first and second roll supports have four of said
clamping jaws arranged in an axial direction of said support
journals.
71. The roll changer of claim 69 wherein an axial length of each
said support journal is at least 250 mm.
72. The roll changer of claim 69 wherein a sum of lengths of said
clamping jaws on each said support journal, in an axial direction
of said support journals is at least 300 mm.
73. The roll changer of claim 69 wherein each said support journal
has at least two of said clamping jaws arranged in an axial
direction of each said support journal.
74. The roll changer of claim 71 wherein said support journals have
at least four of said clamping jaws arranged in an axial direction
of said support journals.
75. The roll changer of claim 71 wherein said axial length of each
said support journal is at least 300 mm.
76. The roll changer of claim 75 wherein said length of each said
support journal is at least 330 mm.
77. The roll changer of claim 69 wherein a length of each said
clamping jaw, in an axial direction of each said support journal is
at least 80 mm.
78. The roll changer of claim 77 wherein said length of each said
clamping jaw is at least 95 mm.
79. The roll changer of claim 69 wherein an axial length of said
clamping jaws in an axial direction of each said support journal is
at least 340 mm.
80. The roll changer of claim 79 wherein said axial length of said
clamping jaws is at least 380 mm.
81. The roll changer of claim 69 further including a plurality of
said clamping jaws on each said support journal and defining a
circumferential, evenly spaced row on a circumference of said
support journal.
82. The roll changer of claim 69 wherein ones of said clamping jaws
on each said support journal are axially aligned.
83. The roll changer of claim 81 further including two rows of said
clamping jaws on each said support journal.
84. The roll changer of claim 69 wherein said clamping jaws on each
said support journal are adapted to receive a core of one of said
first and second rolls of material.
85. The roll changer of claim 84 wherein a length of each said core
is greater than 4000 mm.
86. The roll changer of claim 85 wherein said length of each said
core is greater than 4200 mm.
87. The roll changer of claim 84 wherein each said core has a wall
thickness greater than 10 mm.
88. The roll changer of claim 87 wherein said core wall thickness
is greater than 15 mm.
89. The roll changer of claim 87 wherein said core wall thickness
is greater than 17 mm.
90. The roll changer of claim 87 wherein said core wall thickness
is greater than 20 mm.
91. The roll changer of claim 84 wherein an interior diameter of
said core is 150.2 mm.+-.0.2 mm.
92. The roll changer of claim 69 wherein said roll changer is
adapted to perform a flying roll change between said first web of
material and said second web of material.
93. The roll changer of claim 69 wherein each of said support
journals has a diameter of greater than 140 mm.
94. The roll changer of claim 93 wherein each said support journal
diameter is between 145 mm and 155 mm.
95. The roll changer of claim 93 wherein each said support journal
diameter is between 148 mm and 152 mm.
96. The roll changer of claim 69 wherein said roll changer is
located before, in a direction of web travel, a web-fed rotogravure
printing press.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This patent application is the U.S. national phase, under 35
USC 371, of PCT/EP2005/052543, filed Jun. 2, 2005; published as WO
2006/029911 A1 on Mar. 23, 2006, and claiming priority to
PCT/EP2004/052176, filed Sep. 15, 2004, the disclosures of which
are expressly incorporated herein by reference.
FIELD OF THE INVENTION
[0002] The present invention is directed to methods for carrying
out a flying roll change. An exhausting first web from a first roll
of material is connected with a replacement, second web from a
second roll of material. The first web is connected with the second
web when the first roll of material reaches a minimum diameter.
BACKGROUND OF THE INVENTION
[0003] Roll changers are generally known in the art and are used in
connection with printing presses for feeding-in the web of material
which is employed as the material to be imprinted. Paper webs are
used, as a rule, as the material to be imprinted. In this case, the
web of material has been wound into a roll of material and is
unwound from this roll of material.
[0004] So that the entire printing press need not be stopped when
the web of material has run out, it is generally known to perform a
so-called flying roll change. A fresh roll of material, on which
appropriate web splice connections, such as, for example, adhesive
spots, have been prepared, for use in the connection of the web of
the fresh roll with the web of the roll of material which is
running out, is clamped in the roll changer to accomplish this
flying roll change. Then, in the course of the flying roll change,
the fresh roll of material is accelerated to a circumferential
speed which corresponds to the web speed of the drawn-in web of
material being supplied from the exhausting roll of material. In
the course of the actual roll change, the start of the web of the
fresh roll of material is connected with the web of the running-out
roll of material, and the running-out web of material is severed at
essentially the same time. In this way, the start of the web of the
fresh web of material is drawn into the printing press by the old
web of material and a stoppage of the press is avoided.
[0005] The roll of material which is running out has a continuously
changing, inherent critical resonant rpm which is a function of the
remaining thickness of the running-out roll of material and of the
geometric parameters of the running-out roll of material, and in
particular of its width and of the diameter of the core on which
the web of material has been wound.
[0006] With relatively large web widths, and in particular, with
web widths of, for example, greater than 3,600 mm, and with very
high web draw-off speeds, such as, for example, with web draw-off
speeds of 15 m/s, and because of the generation of vibrations in
the range of the inherent critical resonant rpm, it is possible for
critical vibration conditions to arise in the running-off roll of
material, when its remaining thickness falls below a defined value.
To avoid these critical vibration states, it is therefore often
necessary to reduce the web speed when the remaining thickness of
the exhausting roll of material falls below a defined value. Under
such conditions, this results in either that the exhausting roll of
material cannot be completely used up, in order to avoid critical
vibration conditions, or that the web draw-off speed must be
reduced during the flying roll change roll change. Printing costs
are increased, in an undesired manner, by both of these
occurrences.
[0007] FR 2 076 474 shows a single receptacle for rolls of
material, in which two rows of clamping jaws are arranged one
behind the other.
[0008] DE 36 27 533 A1 describes a roll changer in which a support
device is placed against a used-up roll.
[0009] DE 100 56 274 A1 discloses a clamping mandrel with two rows
of clamping jaws arranged one behind the other. A diameter of the
one row can be changed from 150 to 160 mm, and a diameter of the
other row can be changed from 70 to 80 mm.
[0010] Arrangements for unwinding rolls are known from EP 0 441 152
A, EP 0 708 047 A and EP 0 413 890 A, each of which has support
journals with movable clamping jaws.
[0011] U.S. Pat. No. 3,881,158 A, U.S. Pat. No. 5,360,502, U.S.
Pat. No. 5,316,230, U.S. Pat. No. 3,836,089 and U.S. Pat. No.
4,100,012 describe methods for roll changing.
[0012] U.S. Pat. No. 3,516,517 A and U.S. Pat. No. 4,173,314 A
describe methods in connection with a flying roll change. A roll
change is performed at a remaining roll size that is fixed for a
core diameter.
SUMMARY OF THE INVENTION
[0013] The present invention is directed to the object of providing
methods for a flying roll change.
[0014] In accordance with the present invention, this object is
attained by the provision of a first, exhausting roll of material,
having a first web being withdrawn from it, and a second, fresh
roll of material whose web is to be joined with the first,
exhausting web, during a flying roll change. The second web is
connected with the first web when the diameter of the exhausting
roll of material has reached a pre-set minimum. This minimum
diameter is set as a function of the properties of the roll core or
as a function of properties of a receptacle of a roll changer that
is intended to receive rolls of material.
[0015] The present invention relies on the basic principle of
reducing a free vibration length of the unwinding roll of material
in order to affect, in this way, the inherent critical resonant rpm
of the unwinding roll of material in the desired manner.
[0016] In the course of the employment of a roll changer, a
reduction of the free vibration length between the clamping points
of the unwinding roll of material at the roll changer takes place
because a support device is provided, which support device is
placed against the circumferential surface of the unwinding roll of
material. The free vibration length of the unwinding roll can be
considerably reduced by the use of this additional support of the
roll of material between the clamping points for the roll of
material. If, for example, the support device is brought to rest
against the circumferential surface of the roll of material exactly
in the center of the roll between the clamping points, the free
vibration length of the roll is halved, and the critical inherent
resonant rpm is correspondingly upwardly shifted. In this case, the
support device is arranged in such a way that it can be placed
against the circumferential surface of the unwinding roll of
material when the unwinding roll of material is arranged in the
position which is provided for accomplishing the flying roll
change. The critical vibrating conditions of the unwinding roll of
material occur, in particular, at a relatively small remaining web
thickness or roll diameter, and shortly before the exhaustion of
the roll of material. A support of the unwinding roll is thus
necessary, in particular, in the phase of operation which directly
precedes the roll change.
[0017] It is not a significant aspect of the present invention how
the support device is structurally embodied, so long as a
sufficient support of the unwinding roll of material, for the
reduction of the free vibration length, is assured. In accordance
with a preferred embodiment of the present invention, the support
device has at least one rotatably seated support belt which can be
pressed against the circumferential surface of the unwinding roll
of material. For example, this support belt can be seated on
rollers and rotates at a velocity which is corresponding to the
circumferential velocity of the unwinding roll of material.
[0018] Depending on the type of application, it can make sense to
greatly reduce the free vibration length of the unwinding roll of
material. This length reduction can be achieved in that several
support devices can be provided, all of which are placed against
the circumferential surface of the unwinding roll of material and
are spaced apart and located next to each other. In this case, the
free vibration length of the roll of material then corresponds only
to the respective distance between two adjacent support devices, or
to the distance of the first or last support device from the
clamping points of the unwinding roll of material. As a result, it
is therefore possible to affect the free vibration length of the
unwinding roll of material in any desired way.
[0019] The support device can be provided, in a particularly easy
way, if it does not have its own drive mechanism. In this case, the
support device can be driven by the unwinding roll of material
itself by the transfer of frictional forces from the roll of
material to the support device. To the extent that frictional
forces are employed for driving the support device, the support
device should preferably be made of a wear-resistant material and
with a relatively large coefficient of friction in the area of the
contact surface between the roll of material and the support
device.
[0020] Alternatively, it is also conceivable to provide a drive
mechanism for the support device, by the use of which drive
mechanism the support device is driven. For example, an electrical
motor can be provided as this drive mechanism, by the use of which,
one of the support rollers for seating the support belt is driven.
It is possible, by an appropriate control of the drive mechanism,
that prior to the support belt being brought into contact with the
roll of material, the support belt is accelerated to a velocity
which is synchronized with the circumferential velocity of the
unwinding roll of material. In this case, it it possible to avoid
an undesirable slippage between the support device and the
circumferential surface of the unwinding roll of material, or an
undesirable tearing of the web, when the belt is placed against the
roll of material.
[0021] Often, the employment of the support device is desirable
only during defined phases of the operation of the roll changer,
and in particular, is desirable during the phase of operation of
the roll changer directly prior to the flying roll change. For this
reason, it is particularly advantageous if the support device is
supported so that it is movable between at least two functional
positions. A first functional position corresponds to an actual
position of employment of the support device, in which first
functional position the support device is placed against the
circumferential surface of the unwinding roll of material and thus
appropriately supports the roll of material. A second functional
position of the support device corresponds to a position of rest,
in which second functional position the support device is not in
contact with the unwinding roll of material.
[0022] In principle, it makes no difference with respect to what
way the support device is fixed in place, relative to the roll
changer. In accordance with a first preferred embodiment of the
present invention, the support device is fastened on a roll stand
of the roll changer. This has the advantage that, when the roll
stand is pivoted, the support device is moved along with it. The
result is that no relative movement between the support device and
the respectively assigned roll of material occurs, in the course of
pivoting the roll stand. With this embodiment in particular, it is
possible for the support device to be brought against the unwinding
roll of material prior to the placement of the unwinding roll of
material into the position provided for the flying roll change.
During the pivoting of the roll stand, the unwinding roll of
material is also supported by the support device, preferably even
before the roll of material is accelerated from the stopped state.
Placement of the roll of material into contact with the support
belt occurs simultaneously.
[0023] To realize this embodiment of the present invention, the
support device can be fastened between two support arms of the roll
stand. These support arms also support the respectively assigned
roll of material.
[0024] As an alternative to this first embodiment of the present
invention, the support device can also be fastened on a base
underneath the position of the unwinding roll of material provided
for flying roll change. As a result, the support device is not an
integral part of the roll changer. This alternative embodiment is
of particular advantage when the support device can be lowered into
the base, so that in the position of rest, in which the support
device has been lowered into the base, it does not constitute an
obstacle.
[0025] To be able to control or to regulate the support process of
the unwinding roll of material, by employing the support device, at
least one sensor, for use in measuring a support parameter, such
as, for example, the actually provided support force or the belt
tension of the support belt, can be provided on the support device,
if required. A control device, or a control circuit can be
provided, and can process the results of the measurement provided
by the sensor and can control or can regulate the support device in
accordance with a predetermined desired value.
[0026] The employment of the support device offers particularly
beneficial advantages for use in roll changers in which rolls of
material of a width of greater than or equal to 3,600 mm are
processed. Such webs of material to be imprinted are used, in
particular, in the course of web-fed rotogravure printing, with the
use of web-fed rotogravure printing presses. The high printing
speeds, which are used during such rotogravure printing, lead to
the previously mentioned problems with regard to critical inherent
resonant rpm.
[0027] In accordance with the method for operating the roll changer
in accordance with the present invention, the support device is
brought to rest against the unwinding roll of material prior to an
arranging of the unwinding roll of material in a position which is
suitable for a flying roll change. During the pivoting of the roll
stand, for placing the roll of material into a position which is
suitable for a flying roll change, the support device remains in
engagement with the unwinding roll of material. This engagement
assures that the unwinding roll of material is also supported
during the roll stand pivoting process. As soon as the roll changer
has reached its end position, in which the unwinding roll of
material is placed in a position which is suitable for a flying
roll change, the support device continues to remain in engagement
with the unwinding roll of material until the flying roll change
has been terminated and the old, exhausted roll of material can be
appropriately braked.
[0028] To the free vibration lengths, or preferably in connection
therewith, it is possible, in the alternative discussed above, to
employ a support device. The prevention of inherently critical
resonant rpm can also be improved, in a second alternative, in that
the free vibration length of the unwinding roll of material can be
reduced by employing longer clamping mandrels which support the
roll of material.
[0029] To insure that such longer clamping mandrels provide a
sufficient clamping force against the inner diameter of the core of
the unwinding roll of material, at least two clamping jaws are
proposed to be arranged, one behind the other, on the clamping
mandrel and parallel with the longitudinal axis of the support
journal. It is possible to provide a greater clamping force by the
provision of this increase in the number of clamping jaws so that,
in addition to a reduction in the clamping length, the quality of
clamping is also achieved by increasing the clamping stiffness, due
to an increase of the clamping factor, or chuck factor.
[0030] In the absence of a center support, paper widths of greater
than 4,000 mm, and in particular of a width of 4,300 mm, and wound
on cores or sleeves of a diameter of 150 mm, do not allow for an
assured roll change at velocities of the roll of material greater
than 15 m/s in connection with core constructions that are
currently customary in the industry. In this case, it is possible,
by using long sleeves, to achieve maximum velocities of the roll of
material of 12 m/s, without the provision of a suitable
support.
[0031] Several clamping jaws are preferably distributed, adjoining
each other, in a row of clamping jaws, and in particular are
distributed evenly spaced apart from each other, around a
circumference of the support journal. In accordance with a
preferred embodiment of the present invention, two rows of clamping
jaws, spaced from each other in the axial direction, and with each
row respectively including eight clamping jaws, are arranged in the
circumferential direction on the clamping mandrel. This arrangement
of clamping jaws leads to the highly secure clamping of the roll of
material on the clamping mandrel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Preferred embodiments of the present invention are
represented in the drawings and will be described in greater detail
in what follows.
[0033] Shown are in:
[0034] FIG. 1, a side elevation view of a first preferred
embodiment of a roll changer with a support device in accordance
with the present invention, in
[0035] FIG. 2, a side elevation view of a second preferred
embodiment of a roll changer with a support device in accordance
with the present invention, in
[0036] FIG. 3, a perspective view of a clamping mandrel for use in
a roll changer, in
[0037] FIG. 4, a cross-sectional view of a support journal, in
[0038] FIG. 5, a cross-sectional view through a roll of material
with support journals, in
[0039] FIG. 6, a schematic side elevation view of a scissor-type
lifting table supporting a fresh roll of material, in
[0040] FIG. 7, a schematic side elevation view of a scissor-type
lifting table with a support device supporting an unwinding roll of
material, and in
[0041] FIG. 8, a schematic plan view of a roll changer in
accordance with the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0042] A first preferred embodiment of a roll changer 01 for use in
supplying a web 02 of material, and in particular for use in
supplying a paper web, and which is usable in a non-represented
printing press, is schematically represented in FIG. 1. A roll
stand 04, which can be pivoted around a pivot shaft 03, is provided
on the roll changer 01. Roll stand 04 is constituted by two spaced
support arms, which are located one behind the other in the drawing
plane shown in FIG. 1. Receptacles or roll end support journals 05,
which may be for example configured as clamping mandrels 05, and
which are located opposite each other, are fastened to the free
ends of the respective two spaced support arms of the roll stand
04, and between which clamping mandrels or roll end support
journals 05, rolls 06, 07 can be clamped to the roll changer 01, as
is depicted in FIG. 5.
[0043] In the operational configuration represented in FIG. 1, an
unwinding or exhausting, first roll 06 of material and a fresh or
second roll 07 of material, which has been prepared for a flying
roll change, are clamped to the roll changer 01. The roll stand 04
had previously been pivoted into the position represented in FIG.
1, so that the unwinding or exhausting, first roll of material 06
takes up a position that is required for accomplishing a flying
roll change. For use in supporting the fresh roll 07 of material
and for transmitting the pressure forces, such as acceleration and
braking stop forces to the fresh roll 07 in the loading position, a
first or fresh roll support belt 08 is pushed, from below, against
the circumference of the fresh roll 07 of material.
[0044] As soon as the roll stand 04 has reached the position
represented in FIG. 1, and in preparation for a roll change, an
exhausting roll support device 11, which is fastened on a base 09
underneath the unwinding or exhausting roll 06 of material, is
extended upward until a second or exhausting roll support belt 12,
which is seated on rollers 13, comes into contact with the
circumference of the unwinding or exhausting, first roll 06 of
material. Pneumatic actuating cylinders 14 are provided for use in
extending and retracting the support device 11 with respect to the
exhausting roll of material 06. The second, exhausting roll support
belt 12 is synchronized with the velocity of the paper web by the
use of a frequency-regulated rotary current motor which is not
specifically depicted in the drawings. Tearing of the web 02,
during contact between the web 02 and the belt 12 is avoided by the
provision of this frequency-regulated rotary current motor.
[0045] The free vibration length of the exhausting roll 06 of
material, between the receptacles 05, is reduced by the pressure of
the support belt 12 which is exerted against the circumference of
the unwinding, exhausting roll 06 of material. The result is that
the critical inherent resonant rpm of the roll 06 of material are
shifted into a non-critical rpm range.
[0046] A second preferred embodiment of a roll changer 16, in
accordance with the present invention, is represented in FIG. 2. As
previously described in connection with FIG. 1, a web 02 of
material, a pivot shaft 03, a roll stand 04, the receptacles or
support journals 05, the unwinding or exhausting roll 06 of
material, the fresh roll 07 of material and a support belt 08 for
support and for transfer of the driving forces of the fresh roll 07
of material are again provided on the roll changer 16.
[0047] In a structure which is different from the roll changer 01
depicted in FIG. 1, two spaced support devices 17 and 18 have been
provided on the roll changer 16 and are assigned to the left, or to
the right clamping location, respectively at the roll stand 04. As
indicated in dashed lines in FIG. 2, by the alternative depictions
of the support device 17, the support devices 17 and 18 can each be
displaced in linear guides 19 and can each be matched in this way
to the changing diameters of the rolls 06, 07, respectively of
material and can track their positions.
[0048] Support belts 22 are provided on each of the respective
support devices 17 and 18, which support belts can be brought to
rest against the circumference of the respective roll 06, 07 to be
supported. Pneumatic actuating cylinders 21 are provided for use in
bringing the support belts 22 into and out of contact with their
respective rolls 06, 07, and by whose extension and retraction the
seating structure of the support belts 22 can be pivoted.
[0049] The following procedure is followed prior to a flying roll
change by the roll changer 16. Initially, the unwinding, exhausting
first roll 06 of material is in its so-called run-off position and
is located on the right side of the pivot shaft 03, which
positioning is not represented in FIG. 2. In the course of the
continuing printing process, the unwinding roll 06 of material is
unwound in this position until its diameter falls below a defined
roll diameter, or falls below a defined remaining minimum thickness
of the roll 06 of material 02. When this defined remaining minimum
thickness is reached or is exceeded, the actuating cylinder 21 is
extended and the support belt 22 of the support device 17 is
brought into contact with the circumference of the roll 06 of
material 02. In this process the inherent critical resonant rpm of
the roll 06 of material are shifted into a non-critical rpm range,
so that the web 02 of material can be pulled off the exhausting
roll 06 at an unchanged speed.
[0050] As soon as the exhausting roll 06 of material has been
unwound to a remaining thickness, which remaining thickness makes a
roll change unavoidable, the exhausting roll 06 of material 02 is
pivoted into the position to the left of the pivot shaft 03 by
pivoting the roll stand 04, such as is represented in FIG. 2. The
support belt 22 continues to rest against the circumference of the
roll 06 of material 02 even during the pivot movement, and supports
the exhausting roll 06 of material 02 in this way.
[0051] After the exhausting roll 06 of material 02 has reached a
gluing position, or loading position, to the left of the pivot
shaft 03, as represented in FIG. 2, and the fresh roll 07 of
material, which has previously been prepared for the roll change,
has been clamped in the roll changer 16, a flying roll change
between the exhausting roll 06 of material and the fresh roll 07 of
material can be performed in a generally known manner. A reduction
of the draw-off speed of the web 02 of material is not required in
this process, because the critical resonant rpm of the roll 06 of
material have been shifted into a non-critical range as a result of
the employment of the support device 17.
[0052] Because the support belt 22 of the respective support device
17, 18 can be placed against the fresh roll 07 of material while it
is still stopped, and therefore rests against it during
acceleration of the fresh roll 07, the support device 17, 18 can be
embodied without a drive motor.
[0053] FIG. 3 shows a material roll, end-receiving receptacle 05
which may be configured, for example, as a clamping mandrel 05, in
connection with the roll changers 01 or 16 shown in FIGS. 1 and 21,
respectively. A support journal 24 is provided on the clamping
mandrel 05, and whose exterior circumference comes into contact
with the interior circumference of a roll 06, 07 of material, and
in particular with an inner circumference of a core 10, such as,
for example, a paper core 10, as shown in FIG. 5. To provide a
connection, which is fixed against relative rotation, of the roll
06, 07 of material with the clamping mandrels 15 by the provision
of a positive and non-positive connection, a plurality of clamping
jaws 26, with there being at least four such clamping jaws 26 in
particular, are provided in the circumferential direction of the
support journals 24. Since each of the support journals 24 has a
large insertion depth, by the use of which large insertion depth
the free vibration length between the clamping points can be
reduced, at least two clamping jaws 26 are arranged one behind the
other and are aligned with each other in the direction of the axial
or the longitudinal direction of the support journals 24 as seen in
FIGS. 3, 4 and 5. Several adjoining clamping jaws 26 are
distributed along the circumference of the support journal 24, and
are evenly spaced apart, in particular. In this case, the clamping
jaws 26 which are arranged next to each other, form ring-shaped
rows 27 or 28 of clamping jaws, with each such row 27 or 28
containing eight such clamping jaws 26. The support journal 24 of
the clamping mandrel 05 has an exterior diameter D24, as shown in
FIG. 4, of approximately 150 mm.
[0054] A clamping mandrel 05, including the support journal 24, is
shown in cross section in FIG. 4. A length l24 of the support
journal 24 is at least 250 mm in the axial direction of the support
journal 24. Lengths l24 of the support journal 24 of at least 300
mm, and in particular of at least 330 mm, are advantageous. A
length l26 of each of the clamping jaws 26, in the axial direction
of the support journal 24, is at least 80 mm, and in particular is
at least 95 mm. A sum of the lengths l26 of the clamping jaws 26 in
the axial direction of the support journals 24 is preferably at
least 300 mm, and in particular is 340 mm. In a further embodiment
of the present invention, the sum of the lengths l26 of the
clamping jaws 26 is 380 mm. A diameter D24 of the support journal
24 is greater than 140 mm, and in particular it is between 145 mm
and 155 mm. A diameter D24 between 148 mm and 152 mm is
particularly advantageous.
[0055] FIG. 5 shows a roll 06, 07 supported by the two axially
spaced clamping mandrels or receptacles 05, with each such roll 06,
07 having a core 10, such as is preferably used in the described
roll changer.
[0056] In the depiction of FIG. 5, the length l10 of the core 10 of
the roll 06, 07 resting on the clamping jaws 26 of the support
journal 24 is more than 4000 mm, and in particular is more than
4200 mm. A wall thickness b10 of the core 10 is more than 10 mm,
and in particular, it is greater than 15 mm. A thickness b10 of the
core wall of greater than 17 mm, and in particular of greater than
20 mm, is particularly advantageous. An interior diameter d10 of
the core 10 is 150.2+0.2 mm.
[0057] Alternatively, or as an aid to the previously discussed
steps for reducing the free clamping length of the roll of
material, a setting of the web speed and/or of the diameter of the
remaining or exhausting roll 06 during the flying roll change can
take place for performing the flying roll change.
[0058] As previously described, in the course of a flying roll
change, a first web 02 of material of a roll 06, of material, which
first web 02 of material runs at a first web speed, is connected
with a second web 29 of material of a fresh roll 07 of material,
which second web 29 of material runs at a second web speed. Prior
to connecting the first web 02 of material with the second web 29
of material, the first web speed can be reduced to a second web
speed, so that during the connection of the first web 02 to the
second web 29, during the flying roll change, the first web 02 of
material has a first web speed which is the same as the second web
speed.
[0059] Prior to connecting the webs 02, 29 of material, it is
possible to set a minimum diameter of the remaining or exhausting
roll 06 as a function of the width bO2 of the web 02, 29 of
material, which minimum diameter of the exhausting roll 06
determines the latest time at what time the two webs 02, 29 are
connected with each other.
[0060] In another embodiment of the present invention, the second
web speed, which is predetermined during the connecting process, or
the minimum diameter of the remaining roll 06, is set as a function
of properties of the material of the core 10 of a web 06, 07 of
material.
[0061] In another embodiment of the present invention, geometric
dimensions relating to the core 10 of the web 06, 07 of material,
such as, for example, the size of the interior diameter d10 of the
core 10, or the wall thickness b10 of the core 10, or the modulus
of elasticity of the material which constitutes the core 10,
determine the reduced web speed or the minimum diameter of the
remaining roll 06 of the first roll 02 of material during
connection.
[0062] In a further preferred embodiment of the present invention,
the second web speed, which is predetermined during the connecting
process, or by the minimum diameter of the remaining roll 06, is
set by the use of the geometric dimensions of the receptacle 10,
and in particular of the support journal 24. The reduced web speed
can also be set as a function of the length l26 of the clamping
jaws 26 of the support journal 24.
[0063] The reduction of the web speed and/or the setting of the
minimal diameter of the remaining roll 06 is controlled, together
with the connecting process, by the use of a suitable program.
[0064] Equipping the roll stand 04 with the roll 06, 07 of material
can take place with the aid of a wheeled cart 31, such as, for
example, with the aid of a scissor-type lifting table 31, as is
represented in FIGS. 6 and 7. Wheels 33 have been attached to the
wheeled cart 31, by the use of which a horizontal movement of the
wheeled cart 31 is possible. A vertical movement is also possible.
A support device 11, with a support belt 12, which support device
11 is pivotably fastened on the scissor-type lifting table 31, is
arranged on the wheeled cart 31, as seen in FIG. 7. This support
device 11 shown in FIG. 7 is substantially the same as the
previously described support device 11 shown in FIG. 1. The support
device 11 is motor-driven, such as, for example, by the utilization
of an AC motor, which AC motor accelerates the support belt 12 of
the support device 11 to the web speed. The support device 11 then
places belt 12 against the unwinding roll 07 of material by the of
a hydraulic device, such as depicted schematically at 14. Braking
of the roll 07 of material is also aided by this motor which drives
the support belt 12, because the motor of the support belt 12 of
the support device 11, together with the shaft motor of the roll
stand 04, both brake along the same torque curve until the
remaining roll 07 comes to a stop.
[0065] The roll 06, 07 of material is transported to the roll
changer 01 by a transport carriage 32 which may be pulled by a
chain. The transport carriage 32, with the roll 06 of material,
enters the scissor-type lifting table 31 at ground level. Wheels 34
have been attached to the transport carriage 32, by the use of
which, a movement of the transport carriage 32 inside the
scissor-type lifting table 31 is made possible. The scissor-type
lifting table 31 moves into a centered position and lifts the roll
06, 07 of material approximately 1600 mm above the ground. The
centered roll 06, 07 of material is subsequently placed into a
position wherein it can be placed on the shaft of the roll stand
04, as seen in FIG. 6. Upon reaching this position, the signal
"advance sleeve" is transmitted to the roll stand 04. The
receptacles or clamping mandrels 05, with their associated support
journals 24, are moved into the roll 06 of material. Once the
receptacles or clamping mandrels 05, with their associated support
journals 24, have been moved into the roll 06, 07 of material and
specifically into the core 10 of the roll of material 06, 07, and
the clamping jaws 26 have been spread open in the interior of the
core 10, the scissor-type lifting table 31 is lowered upon the
signal "roll placed on the shaft" and is moved into its initial
position.
[0066] During the roll change, after the rotation of the roll stand
04, the support device 11 moves against the unwinding roll 07 of
material, into a support position and stabilizes the unwinding roll
07 at its center. Upon the command "advance cutter" the unwinding
web 29 of material is cut off the roll 07 of material and the now
exhausted roll 07 of material is stopped via the shaft motor of the
roll stand 04. As previously described, the braking process of the
now exhausted roll 07 of material is supported by the support
device 11 of the scissor-type lifting table 31. The support belt 12
pivots away from the now exhausted roll 07 of material, and the
scissor-type lifting table 31 moves into its loading position in
order to load a fresh roll 07 of material.
[0067] The core 10 of the now exhausted remaining roll 07 is
removed by a core crane, and in particular a clamping crane with a
trolley. The removed roll 07 is conveyed to a carriage for
disposal.
[0068] A schematic plan view of the roll changer with various
stages of the roll supply is represented in FIG. 8.
[0069] While preferred embodiments of methods for carrying out a
flying reel change, in accordance with the present invention have
been set forth fully and completely hereinabove, it will be
apparent to one of skill in the art that various changes in, for
example, the specific structure of the printing press, the type of
printing being accomplished, and the like could be made without
departing from the true spirit and scope of the present invention
which is accordingly to be limited only by the appended claims.
* * * * *