CA1201055A

CA1201055A - Cut off knife

Info

Publication number: CA1201055A
Application number: CA000439720A
Authority: CA
Inventors: Louis J. Bagnato
Original assignee: Beloit Corp
Current assignee: Beloit Corp
Priority date: 1983-02-04
Filing date: 1983-10-26
Publication date: 1986-02-25
Also published as: JPS643781B2; EP0118384A1; AU2403384A; AU548813B2; JPS59153748A; BR8400526A; MX157932A

Abstract

ABSTRACT OF THE DISCLOSURE
A paper machine winder having parallel rotatable winder drums providing a winding nest therebetween with a core carrier movable to drop a core into the nest and having a roll ejector for pushing a wound roll out of the nest, a means for applying a glue to the surface of the core and a knife for severing the trailing end of the web when the roll is wound movable in a path eccentric to the first drum and extending the full length of the drum, the first drum being perforate and having vacuum means therein.

Description

S P E C I F I C A T I O N

T I T L E

" CUT OFF E :NI FE "

BACRGROUND OF T~E INv~h~ION
The present invention relates to improvements in paper machine winders~ and more particùlarly winders which receive a continual supply of paper web at a high speed, wind it into a roll and automatically discharge the wound roll, provide a fresh core for starting a new roll and sever the web to release the wound roll and start the lead end of the fresh web onto the new core. The features of the invention particularly relate to an improvefl mechanism for performing the sequence of operations necessary to cut the web in an improved manner.
As is known, with developments an~ improvements, there is a constant increase in the ~peed of paper machines. The economics of such improvements are obvious inasmuch as a papermaker reduces his cost of operation and capital equipment if his output on any given machine can be increased. ~ne example of speed increases has been in newsprint machines which operate frequently at 1000 meter~ per mlnute (3300 fpm) and are being designed for 1200 meters per minute (4000 fpm) with the speed capabilities continually increasing. Frequently, such winders are used in conjunction with papermaking machines, and as the speed and output of the papermaking machine increases, the speea capability of the winder must also be increased~ ~he paper machine winder operates essentially as a batch operation, with the winding being temporarily stopped between each wound roll to allow for cutting the web and for starting the web on a fresh core. Additionally~ time must be allowed for splices, slitter setting changing, blade changes, and with the temporary shut-down necessary, the winding machine must operate at a sufficiently high speed to catch up with the output of the papermaking machine. The rule of thumb used to be that the winder should be designed for three times the paper machine speed. However, when winding rolls of smaller diameters such as 40" which is customary for newsprint, merely increasing the top speed of the winder is of limited value because the run times are too short between completing the roll and beginning a fresh roll.
It is accordingly an object of the present invention to improve the speed of output of a paper machine winder by shortening the down times, and in part;cular provlding improved structure for cutting the web and facilitating the discharge of the wound roll and the starting of the fresh roll.
In devices heretofore available, the most consistently recurring down-time in a paper machine winder is caused by changing roll sets. As the winder is decelerated to a halt, ~hucks are retracted, guards positioned, the wound roll is discharged onto a table or a cradle, new cores are inserted and fastened to the tails, guard and rider roll are lowered, chucks are inserted and the winder is started again. Automatic sequence of these operations has improveA the speed of operat;on and reduced the time needed between rolls, but even with these functions integrated into a fully automatic machine, the down-time between cores is relatively large.

_~_ ~Lz~s~

A further object of the invention is to provide an improved structure for the operation of a two drum or shaftless winder wherein the time required between rolls is reduced to increase the total output of the machine and reduce the overall operation time for winding rolls. A feature of the invention is to provide for rapid automatic change-over from the complete wound roll to starting the fresh core in a manner which is reliable to the extent of starting a fresh core without losing the web, and in particular cutting the web in an improved manner. When the full core is completed, it is pushed out of the winding nest between the drums, a full width serrated knlfe is moved upwardly between the drums into the nest in a unique path having a center eccentric to the first drum to intersect the web simultaneously while being ejected. The web is cut by the knife on the first drum, which is a suction drum, and simultaneously, a fresh core i5 brought into the nest between the drums having been prepared by adhesive on its surface, and the cut lead end of the web is immediately started onto the fresh core with the whole intermediate operation between ejection of the roll and starting of the fresh core being maintained at a minimum so as to be accomplishable in a tîme span of somewhere between 30 and 50 seconds. By the reduction of the time between rolls, the overall output of the machine is increased so that the winder can more readily keep up with the output o a high speed papermaking machine.
Other ob-~ects, advantages and features, as well as equivalent strucl:ures and methods which are intended to be covered herein, will be more apparent from the teaching of the principles of the invention in aonnection with the disclosure of the preferred embodiments thereof in the specification, claims and drawinys in ~Jhich:

5.5 DESCRIPTION OF T~E DR~WINGS
FIGURE 1 is an end elevational view, sh~wn somewhat schematically, of a two drum winder constructing and operating in accordance with the principles of the present invention showing the condition of the wound roll as it builds up to full 6ize;
FIGURE 2 is another schematic end elevational view lllustrating the beginning of forcing the wound roll out of the winding nest between the drums; -FIGURE 3 is another schematic end elevational viewshowing the web being cut just prior to the wound roll being ejected and a fresh core being dropped into the winding nest;
FIGURE 4 is another schematic end elevational view showing the fresh core dropped into place, the knife be;ng retracted, and winding started on the core:
FIGURE 5 is another schematic end elevational view showing the core insertion mechanism being withdrawn and winding being started on ~he fresh core; and FIGURE 6 is another schematic end elevational view showing the operation of the mechanism when a bad start is encountered with the improperly started roll being ejected.
DESCRIPTION
As illustrated in each of the Figures, the two drum winder mechanism includes first and second drums 10 and 11 extending horizontally on parallel axes with means to drive the drums in rotation~ The drums define a winding nest 17 therebetween for supporting a roll being wound with the roll shown at 14 in Figure 1 as it is begun ana at ~S in Figure 1 as it is being completed.
A web W is led over the first or front drum 10 which is constructed as a perforated roll shell having perforations 12 therethrough. The drum becomes a vacuum chamber by applying ~39 C~S~

vacuum to the front side drum journal by means shown schematically at 23. ~he suction holds the web to the roll when the web is severed.
The second or back drum 11 will present a smooth supporting surface 13 to ~he roll 14 being wound.
- Operating in con~unction with the winding drums is a core carrier 16 which operates to bring a fresh core ;nto the winding nest 17 and has a roll e~ector surface 21 for forcing the wound roll out of the winding nest onto roll table 32a shown in Figure 3.
~ he core carrier receives a fresh core 18 and holds the fresh core between movable jaws 19 and 20 which receive a fresh core and drop it at the appropriate time when the carrier is moved over the winding nest.
For severing the web when the wound roll 15 is complete, a knife 31 is supported on a knife carrier and arm 24 and moved upwardly between the drums from a recessed position, as shown in Figure 1, to a cutting position, as shown in Figure 3. The knife has a concave curvature essentially conforming with the outer surface of the drum 10. The knife extends continuously across the full width of the web and has a serrated cutting edge 32.
The arm for carrying the knife moves pivotally to carry the knife between the recessed position and the cutting position movable about a center 25 which is slightly eccentric from the rotational center 26 of the drum 10. Thls will move ~he knife 31 in a generally concentric path with the roll, but moving the cuttlng edge 32 ever increasingly closer to the surface of the web as it moves into the final cutting position of Figure 3.
In winding operation, as shown in Figure 1, the web W
feed~ under the front drum 10 up onto the surface of a roll 14 being wound. The rolls 10 and 11 are driven rotationally at the surface speed of the rotation of the roll 14 being wound with control as to the tightness of winding and the tightness of the roll being obtained by applying a controlled torque differential to the rolls lO and 11 as will be recognized by those versed in the art. When the roll is wound to the desired size as ~ndicated at 15 in Figure 1, the carrier 16 is moved to the right as indicated s~hematically by the arrowed line 26 in Figure 2.
Prior to the roll 15 being completed, a fresh core 18 is placed into the carrier and the holding jaws 1~ and 20 are brought together to clamp the core as shown in Figure 2. An adhesive substance is applied to the outer surface of the core either by an adhesive spray extending for the full length of the core or by means applying an adhesive tape to the core surface. The adhesive on the outer surface of the core will serve to form an attachment for the lead end of the paper web when it is cut. When roll 15 is completed, drums lO and ll are slowed to a stop.
As the carrier 16 is brought to the right as shown in Figure 2, the surface 21 on the carrier engages the outer surface of the roll and the carrier, acting as an ejector, forces the roll to thP right, as shown ;n the drawings, up over the back drum ll onto the roll receiving table 32a.
The knife 31 has begun its travel, as indicated by the arrowed line 25 from its recessed position, shown in Figure 1, toward the cutting position of Figure 3. Movement of the knife is in a curved path up between the space between the drums lO
and ll.
Referring to Figure 3, when the completed roll 15 moves ~ ~
up over the drum 11, drum ll is free to rotate, and the knife has travelled to its cutting position of Figure 3, as indicated by the arrowed line 25, to where it inter~ects the web at point QS~

30. The completed roll pulls the web taut over the serrated edge of the knife, which extends ~he full width of the web, and the web is cut.
Vacuum is applied to the roll lO to hold the cut lead end of the web in placeO Vacuum will be controlled by a ~echanism shown at 23 schematical:Ly in Figure 1 in a manner which will be fully appreciated by those versed in the art.
At that point, the fresh core is brought fully over the nest 17 between the drums as illustrated in Figure 4. The corë
is dropped by separating the jaws 19 and 20, and the lead end of the cut web will adhere to the adhesive surface of the core 18 upon start of rotation of drums 10 and ll. As the lead end follows around with the core, it immediately begins to wind onto the core starting a new roll as illustrated in Figure 5. In the meantime, the knife has moved back down to its retracted position, as indicated by the arrowed line 25 in Figure 4 to where it is in the retracted position of Figure 5 where it remains during the winding operation. The carrier 16 is withdrawn to the position shown in Figure 5 in advance of the front drum 10 ready to receive a fresh core.
A feature of the invention is the reliable and secure cutting operation which occurs in Figure 3 ln such a manner that the functions of cutting and bringing the fresh core can be performed very rapidly substantially shortening the time between the ejection of the comple~e roll and the starting of ~he roll onto the fresh core. If the cutting is not accomplished reliably and rapidly~ not only will the amount of time consumed be increased, but the chance of losing the lead end of the web will be increased. If such a mishap occurs at this point, time must be allotted for the operator to pick up the lead end of the web and correc~ lthe deficiencies and this greatly slows the overall operation of the winder. Furthermore, if a mishap SS

occurs at cutting, the starting of the lead end onto the fresh core can malfunction resulting in a bad start. While the cutting arrangement as illustrated greatly reduces this possibility, the present structure permits eiection of a small roll which has been the result of a bad ~tart, as illustrated in Figure 6. As soon as the bad start is noticed, the carrier can be brough~ over in the manner indicated by the arrowed lîne 29 to force the bad start roll 33 out of the nest. Because the fresh core has been placed into the carrier immediately when it is withdrawn to the left as shown in Figure 5, a fresh core 34 will be on the carrier to immediately start a new roll when the bad start roll 33 is ejected. The e~ection of the bad start roll, of course, will be accompanied by movement of the knife 31 from its retracted position as shown in Fi~ure 1 up to its cutting position as shown in Figure 3. The lead end will be held onto the drum 10 as it is stopped and the web i~ cut, so that when the core 34 is dropped into the nest between the rolls, the lead end will immediately be adhered to the surface of the core and the drums again started up with the lead end of the web following the surface of the core.
Thus, the knife having its concave shape, moves along the surface of the front drum 10 into the space between the drums and the lead cutting edge 32 simultaneously cuts the full width of the web in a rapid reliable manner. The intersection of the cutting edge 32 of the knife and the web causes a coaction with thle web being held on the stopped drum 10 so that the tension of the web being pulled as the completed roll 15 rolls away from the drums will cause the web to be pulled a~ainst the ~errlated knife to cause the cutting operation.
The function of the knife in cutting is not limited to one size of roll, but operates in essentially the ~ame fashion with all sizes and is performed au~omatically as the finished ss roll is propelled out of the ne~t between the drums. All of the functions can be accomplished automatically with thè parts operating in seguence. The fresh cores can be brought into position from above or loaded axially into the jaws and this can be done rapidly with adequate spac:e being provided by the carrier located above and in advance of the front drum 10.
The knife also functions t:o sever the tails of the web when the winder is initially threaded without a wound roll resting on the winder drum. In this operation, the winder is threaded in the conventional manner bringing the full width w~b and/or slit tails around the suction winder drum in a counter-clockwise direction. When the web or slit tails are threaded~
the knife is rotated counter-clockwise with the serrated leading edge moving into a position to capture the threaded tails between the outside surface of the drums 10 and the serrated edge of the knife. The operator then pulls the threaded tails away from the winder and the serrated leading edge of the knife ~evers the web with the web being held closely between the drum surface and the knife. The tails are severed in a length suitable to continue the automatic operation.
With the knife moving in its path substantially conforming to the outer surface of the drum, but moving along the surface approaching the drum because of its eccentric mounting, the inner ~oncave surface of the knife 31 provides a shield or holder which holds the web captive between the drum and the knife so that the knife per~orms a dual function of a cutter and safety holder. Thus, any loose or frayed ends of the web will be forced to travel along the surface of the drum aided by suction within the drum. The knife is compactly held and construc~ed requiring a minimum of space for its opera~ional movement between the drums and moves to a noninterfering inoperative position.

g _

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A paper machine winder comprising in combination:
first and second parallel winder drums defining a winding nest therebetween for supporting a roll being wound onto a core with a web fed onto the roll under the first drum;
a knife for severing the trailing end of the web after the roll is fully wound;
a knife arm means supporting the knife and movable about an axis eccentric to the axis of the first drum moving the knife in a path to intersect with the web on the first drum and toward the surface of the first drum;
a core supply carrier movable from a retracted position away from the nest to an operative position above the nest for depositing a fresh core to be wound; and a roll ejector movable in the path to engage the outer surface of a wound roll forcing it out of the nest.

2. A paper machine winder comprising in combination:
first and second parallel winder drums defining a winding nest therebetween for supporting a roll being wound onto a core with a web being fed onto the roll over the first drum:
a knife extending substantially for the length of the first drum and having a conforming curvature substantially concentric with said first drum and movable in a path away from the nest toward an operative position into engagement with the web in the nest for severing the web as a wound roll is moved out of the winding nest; and a roll ejector movable into engagement with the wound roll to force it out of the nest preparatory for placing a fresh core into winding position.

3. A paper machine winder constructed in accordance with claim 1:
wherein said knife extends for substantially the full length of the first drum.

4. A paper machine winder constructed in accordance with claim 2:
and including a core supply carrier movable from a retracted position to an operative position above the nest for bringing a fresh core into winding position.

5. A paper machine winder comprising in combination:
first and second parallel winder drums defining a winding nest therebetween for supporting a roll being wound onto a core with a web fed onto the roll under the first drum;
said first drum being a hollow roll shell with perforations therein and having means for applying a vacuum within the drum to selectively hold the web being wound onto the drum surface;
a knife movable along the surface of the first drum vertically upwardly into the nest to intersect and sever the web being fed through a wound roll as the roll is being ejected from the winding nest; and a core supply carrier movable from a retracted position to an operative position for delivering a fresh core into the winding nest.

6. A paper machine winder constructed in accordance with claim 5:
including a roll ejector carried with the core carrier for engaging and forcing a wound roll out of the nest as a fresh core is brought into the nest.

7. A paper machine winder constructed in accordance with claim 5:
wherein said core carrier has a downwardly facing core pocket with jaws for holding the core in position and for releasing the core as the carrier is moved into position above the nest.

8. A paper machine winder constructed in accordance with claim 5:
including means for applying an adhesive to the full length of the core prior to the core being moved into the winding nest.

9. A paper machine winder constructed in accordance with claim 5:
including means for controlling the vacuum applied to the interior of the first drum.

10. A paper machine winder constructed in accordance with claim 2:
wherein said knife has a serrated cutting edge extending for the full length thereof.

11. A paper machine winder constructed in accordance with claim 2:
including a knife carrier arm means mounted on a pivotal center below the first drum and further from the nest than the axis of the first drum so that the knife moves in a path eccentric to the curvature of the first drum to substantially intersect with the drum surface as the web is cut.