Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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:~ CUTOFF AND TRANSFERENCE MECHANISM FOR REWINDER
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BACKGROUND AND SUMMARY OF INVENTION:
This invention relate~ to a cutoff and transference
mechanism for a rewinder and, more particularly, to a mechanism
utilizin.g a brush roll as an anvil roll.
.j In the rewinding of cross perforated webs such as
toilet tissue and kitchen toweling, a jumbo parent roll of five
feet or so in diameter is unwound and rewound on cores to form
the well-known retail sized rolls. To perform this efficiently, `:
la the web must be severed, carried to the rewinding station and
adhered to the core -- all at line speed~ ~xemplary of a
widely-employed cutoff and transfer mechanism is that of
co-owned, expired Patant No. RE. 28,353. :.
Prior to the '353 patent, there wa~ a rewinder speed : -:
limitation of 1500 feet per minute because above ~hat the cutoff
and tran~ference mechanism would literally hammer itself to
. pieces. The '353 patent overcame thi~ limitation by providing a
cutoff at one location and transfer at another location.
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' In the '353 patent, a bedroll containing an emergent
knife/impaiing means operated to simultaneously sever the web
along a line of transverse perforation and impale the leading
edge of the severed web for contxolled movement through an arc
- to the rewinding station. For this cutoff and impaling an anvil
roll containing resilient pads was employed and the emergent
knife/impaling means pressed the web against the anvil roll.
The invention utilizes a brush backup roll in place of
the conventional anvil roll. Such backup rolls have been used
in perforation, scoring and slitting, being available from The
Industrial Brush Co. o~ Fairfield, New Jersey. However, they
have not been used in an environment where the web had a free
leading edge. With rewinding speeds of the order of 2,000-3,000
feet per minute, any failure to control the free leading edge of
the web could result in a large quantity of paper being ruined
as well as costly clean-up.
In particular, it is critical to properly control the
free leading edge of the web on the pointed trans~er ~ingers or
by vacuum. Thi~ was insured by the combination of pointed
fingers and the resilient pads of the prior art. There was no
! obvious assurance that these finger~ operating against bristles
¦ would achieve tho necessary capturing of the edge port~on of the
web. Also, therc was no assurance that the vacuum pickup would
work on a free leading edge portion when in contact with brush
bristles. In particular, it was felt that a free wsb might be
caught on the bristles of the backup roll and thus frustrate the
object of the whole rewinding operationO
This unacceptable action does not occur when a brush
utilizing a substantially dense arrangement of bristles is
employed. Additionally, the use of a brush back-up roll results
in the significant advantage of not having to carefully time the
back-up or anvil roll. This wa-~ necessary with the pad-equipped
anvil rolls of the past to make sure that the emergent means
(particularly the knife blades) were circumferentially aligned
with the anvil roll pads. This advantage is on-going because
replacement is so much simpler in the inventive arrangement.
In general, the invention contemplates the steps of
continuously advancing a web along a longitudinal path,
advancing the web through a perforator in the path to develop
equally longitudinally spaced transverse lines of perforation,
thereafter advancing the web through a nip de~ined by a cutoff
bedroll and a brush equipped anvil roll, the bedroll being
equipped with emergent means for simultaneously completely ~;
transversely severing the web to provide a leading edge portion
and for controlling ths leading edge portion on either pointed
finger means or by vacuum, substantially completely severing the
web and controlling the leading edge portion, and advancing the
leading edge portion into contact with an adhesive equipped core
for transfer thereto.
An ob~ect Or the invention is to provide a novel backup
roll in combination with emergent means including both knife
means and means for controlling the free leading edge of a
severed web for arcuate travel to a web rewinding station.
Another object is to provide a backup roll which i~ not subject
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to the need for extensivsi assembly or setup -- especially the
need for timing the cutoff and transfer of the web. Other
~ objects and advantagPs of the invention may be seen in the
;~ details of the ensuing specification.
7 BRIEF DESCRIPTION OF DRAWING:
-1 The invention is described in conjunction with the
d accompanying drawing in which --
~ FIG. 1 is a side elevational view, essentially
j 10 schematic, of a rewinder incorporating the invention;
FIG. 2 is a developed fragmentary end elevational view,
essentially schematic of a rewinder construction of the winder
seen in FIG. 1;
FIG. 3 is an enlarged fragmentary side elevational view
of a portion of a bedroll carrying knife and pointed finger
emergent means for cutoff and transfer along with a backup brush
roll;
FIG. 4 is a view similar to FIG. 3 but features a
subsequent step in the bedroll and backup roll operation; and
FIG. 5 is a fragmentary side elevational view si~ilar
to FIGS. 3 and 4 but showing vacuum as the control means.
DETAILED DESCRIPTION
In the illustration given ln FIG. 1, the numeral 10
designate~ generally a frame which is conventional in
rewinders. More particularly, the frame 10 includes a pair of
longitudinally extending side frames 10a and 10b (see FIG. 2)
which provide an elongated path and support a number of
¦ rotatable rolls therebetween.
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Returning to FI&. 1, the numerals ll and 12 at the
upper left hand portion of the view designate pull rolls or draw
rolls which operate to advance a web W from a parent roll (not
shown). The web is further advanced by a perforator bedroll 13
and a transfer bedroll 14. Cross perforations as at W' are
provided in the web -- see also FIGS. 3 and 4 --by a
knife-equipped perforator bedroll 13 operating against a
stationary anvil 15. The widely used perforator is seen in
co-owned, expired Patent*No. 2,870,840.
The web in proceeding along the path P defined by the
frame 10 is in partial wrapping relation to a bedroll 14. The
numeral 16 designates the brush roll which operates as a backup
roll in combination with the bedroll 14 for the cutoff and
impalement of the free leading edge of the web W.
The invention i5 described in conjunction with a
"center-wound" type of rewinder, particularly of the type of
*Patent RE. 28,353. However, the invention can be used equally
advantageously with surface wound types such as those seen in
co-owned Patents No. 4,828,195 and 4,962,897, and earlier*Patent
No. 4,487,377.
Referring specifically to FI&. 1, the numeral 17
designates generally a mandrel-equipped turret which is mounted
for rotation in rewinder frame 10 and which is disposed in
30 parallel, side-by-side relation with the bedroll 14. In the
illustration given, the turret 17 is equipped with six mandrels
! as at 18, the mandrels being arranged for sequential movement
into web-contacting relation.
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,~, In the operation of the turret 17, a core on which the
web W is to be wound is inserted on the mandrel 18 in the
station designatieid by the letter A. In the operational
sequence, a mandrel 18 is rotated from the core-receiving
station A into the station B, where previously the core was slit
to corxespond to the axial length of toilet tissue or towel
rolls. Now the cutting is performed on the completely rewound
roll-termed a log.
Thus the station B is unused in current rewinders.
Further rotation of the turret 17 brings a mandrel 18 to the
station designated C where glue-applying mechanism operates to
provide each core segment with glue between the stations C and
D. 5till further rotation of the turret moves the mandrel into
the station D, where the new mandrel is accelerated to transfer
speed preparatory to transfer. In the station D, the mandrel 18
is engaged with the driving belt 19 and is accelerated to web
speed. As the mandrel moves toward station E transfer occurs.
During movement from station E to station F, the
mandrel 18 continues moving down and increasingly away from the
bedroll 14. Prior to reaching station F, a discrete,
predetermined length of the web has been wound and cut off,
after which the mandrel arrives in position F, which is the
finished roll-removing station.
Finished roll removal is achieved through the mechanism
seien in co-owned*Patent 2,769,600. The intermittent
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operation of the turret 17 is achieved through a Geneva gear and
other suitable mechanism ~not shown), which indexes shaft 20.
3 The mandrels 18 may be dri~en by a motsr through the belt 19
previously described. Details of the belt drive can be seen in
~ co-owned, expired Patent No. 3,116,890.
:~ CUTOFF AND TRANSFERENCE
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Turning now to FIG. 3, the symbol W again designates
the web but here in the process of being in contacted by the
emergent means 21. These operate in conjunction with the brush
roll 16 which is equipped with bristles protruding from a
central core 22 as at 23.
The emergent means includes a blade 24 which engages
~he web W at a line of cross perforations W' and results in a
free leading edge W'' which is impaled on a pointed finger means
25. More particularly, a plurality of such fingers are employed
aligned transversely of the rewinder so as to insure secure
capture of the free leading edge W ". More particularly, in
FIG. 3, the knife blade 24 is seen partially inserted into the
bristles 23 to insure proper cutoff.
In FIG. 4, the pointed finger means 25 are seen
entering into the protruding bristles 23 of the brush roll 16'
to make sure that this capture is achieved. After leaving the
bristles 23 of the roll 16' the finger means 25 convey the
leadin~ edge ~ " of the web W into contact with a core for the
development of a new retail sized roll.
In FIG. 5, an alternative embodiment is illustrated
where the pointed ~inger means are replaced by vacuum ports 125
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¦ in bedroll 114. There is however, the same emergent knife 124.
Also, the details of the bristle-equipped anvil roll 116 is
substantially the same as that of the embodiment illustrated in
FIG~. 3 and 4.
The bristle density is of the order o* about 500-3000
per square inch with 1600 being optimum. The bristle diameter
is of the order of about .005-.050 inch with .016 inch being
optimum The bristle length is of the order of about 0.25-1.25
inch with 0.5 inch being optimum. The roll diameter (including
protruberant bristl2s is of the order of about 5-20 inch with
7.5 inch being optimum.
It has been found advantageous to operate the
bristle-type anvil or backup roll at a speed different from the
speed of the web. More particularly, the surface speed of the
brush roll can range from 15% to 20~ below web speed to 15% to
20% above web speed. This avoids catching the we~ on the brush
roll.
The speed o~ the variou~ rolls is advantageously
achieved through drive means such as that depicted schematically
in FIG. 2 where the numeral 26 designates generally a timing
, belt connecting a pulley on the shaft 27 of the bedroll 14 and a
pulley on shaft 28 of the backup roll 16. These are
conventionally driven by motor means (not shown). An advantage
of the brush roll is that accuracy o~ gears is not needed.
While in the foregoing specification, a detailed
description of the invention has heen set do~n for the purpose
of illustration, many variations in the details hereingiven may
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be made by those skilled in the art without departing from the
~,spirit and scope of the invention.
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