US3844501A

US3844501A - Machine and method for winding

Info

Publication number: US3844501A
Application number: US00296960A
Authority: US
Inventors: H Spencer
Original assignee: Paper Converting Machine Co
Current assignee: Paper Converting Machine Co
Priority date: 1972-10-12
Filing date: 1972-10-12
Publication date: 1974-10-29
Anticipated expiration: 1991-10-29
Also published as: JPS4972562A; DE2325660A1; DE2325660C2; IT977443B; CA986901A; FR2203369A5; SE400258B; GB1378096A; BE795742A; JPS5229383B2

Abstract

A machine and method for winding a web sequentially on cores without the use of adhesive, wherein oscillating roll means are interposed between a web feeder and a transfer station mandrel for redirecting the path of travel of the advancing web while maintaining the distance between the feeder and the transfer station constant so as to avoid marking the web while arranging the web for glueless transfer.

Description

United States Patent 1 1 Spencer ml I 3,844,501 1 Oct. 29,1974v 1 1 MACHINE AND METHOD FOR WINDING [751 lnventor: Harvey ,1. Spencer, Green Bay, Wis.

[73] Assignee: Paper Converting Machine Company, Green Bay, Wis.

{22] Filed: Oct. 12, 1972 [21] Appl. No.: 296,960

152] U.S. Cl 242/56 A [51} Int. Cl B65hI9/20 [58] Field of Search 242/56 A, 56 R, 56.4, 56.5, 242/58.4, 64

[56] References Cited UNITED STATES PATENTS 2,787,427 4/1957 Marczincsin 242/56 A 3345,00) 10/1967 Rockstrom v 242/56 A 3,377,032 4/1968 Jacobs ct a1. 242/56 R 11 1.. fig

Hellemans 242/56 R Nystrand 242/56 A Primary Examin,erJohn W. Huckert Assistant ExaminerJon W. Henry Attorney, Agent, or FirmDawsot 1, Tilton, Fallon & Lungmus [5 7 ABSTRACT A machine and method for winding a web sequentially on cores without the use of adhesive, wherein oscillating roll means are interposed between a web feeder and a transfer station mandrel for redirecting the'path of travel of the advancing web while maintaining the distance between the feeder and the transfer station constant so as to avoidmarking the web while arranging the web for glueless transfer.

14 Claims, 7 Drawing Figures "tin PATENIEUnmzsmm v sum 1 w a FIG! I MACHINE AND METHOD FOR WINDING BACKGROUND AND SUMMARY OF INVENTION This invention is an improvement on the web winder set forth in co-owned, allowed application of Ernst D. Nystrand, Ser. No. 108,067, filed .Ian. 20, l97l,.now US. Pat. No. 3,697,010.

The winder in the above-identified application has been used for winding large rolls of web material to form parent rolls, i.e., rolls having thousands of feet of web material. A feature of the invention of the earlier winder was the use of an air jet and knife arrangement to effect transfer and thus eliminate the need for adhesively securing the leading edge of a severed web to a new core. This is particularly important in the winding of plastic webs such as polyethylene.

However, when the principle of the earlier winder was employed for the rewindin'g of such webs into retail sized rolls, viz., from 10 to I feet, it was found that there was a disadvantageous scoring or marking of the web just prior to cut-off and transfer. Inasmuch as this marked portion of the web constituted the tail of the roll just being finished, it would be thefirst portion used by the housewife hence, objectionable. On the other hand, when the same material was wound into parent rolls, the marking of several feet in the tail was unobjectionable because this amount usually was sacrificed when the parent roll was threaded into a revwinding machine.

To overcome the'disadvantage characteristic of the earlier winder, I have proposed asequence of steps and arrangement of elements which substantially eliminate the disadvantageous marking. l have determined that the marking characteristic of the earlier winder was attributable to relative movement between the advancing web and the surface of a core next in line for winding. Through the use of an oscillating roll arrangement, I have been able to avoid the undesirable relative movement, yet at the same time provide a mechanism suitable for glueless transfer, viz., through the air blast and knife arrangement previously referred to.

DETAILED DESCRIPTION OF THE INVENTION The invention is described in conjunction with an illustrative embodiment in the accompanying drawings, in which:

FIG. I is a perspective view of apparatus embodying teachingsof the invention, and showing one end of the machinery; r v

FIG. 2 is another perspective view of apparatus revealing the other end;

FIG. 3 is a schematic side elevational view of certain operative portions of the machine of FIGS. 1 and 2 with which the instant invention is concerned;

FIGS. 4-6 are further schematic views essentially similar to FIG. 3 but showing the parts thereof in differentoperational positions; and

FIG. 7 is a perspective view of the central portion of v FIG. 2.

In the illustration given and with reference to FIGS. 1 and 2, the numeral 10 designates generally the machine frame. In the illustration given, the frame is essentially a box-like structure supporting a plurality of rolls in the interior thereof and which are driven through gearing generally designated 11 from a motor (not shown). In FIG. I, the numeral 12 designates a discharge platform or way wherein finished retail sized rolls of plastic web material -such as polyethylene are directed out of the frame 10.

In FIG. 2, the numeral 13 designates a core hopper for supplying cores to be wound in sequence and discharged from the other side of the machine on the way 12.

Referring to FIGS. 2 and 3, it will be seen that a roll is in the process of being wound at 14 in the winding stations of the turret 15, the shaft of the latter being generally designated 15a in FIG. 3. The turret 15 includes a plurality of mandrels or arbors which, when the turret rotates, orbit through a plurality of positions or stations. In the illustration given, a four-arbor turret is employed with arbor stations for unloading being represented by'the numeral 16, for core loading as at 17, and for transfer as at 18.

Stations

17 and 18 are indicated also on FIG. 2. The turret is arranged for rotation about the axis of the shaft 15a so as to bring the various arbors thereof sequentially through the transfer station, winding station, etc. It will be appreciated that the invention can also'be employed to advantage where the cores are eliminated and the web wound directly on the mandrels or arbors, viz., core means.

Web material W (still referring to FIG. 3) is brought into the frame from a parent roll source (not shown) by means of feed rolls l9 and 20. The rolls l9 and 20 are suitably driven from the gearing 11 and serve to feed or advance the web W at a constant rate toward the turret for winding.

The numeral 21 in FIG. 3 designates an auxiliary roll which is mounted for free rotation in the frame 10, but with its axis fixed. It will be noted that in FIG. 3, the path of travel of the web W issuch as to be partially but substantially wrapped around the auxiliary roll 21. In the illustration given, the diameter of the auxiliary roll 21 is the same (O.D.-) as the core (or mandrel,when no core is used) onto which the web is to be wound. However, three

other rolls

22, 23, and 24 also serve to determine the path of travel of the web W from'the feed rolls 19-20 to the arbor in the winding station 14. The

rolls

22, 23, and 24 are mounted on a sub-frame 25 (see FIG. 2) for oscillation to the positions 22', 23', and 24' as designated in FIGS. 4-6.

Referring again to FIG. 3, the machine condition corresponds to the middle of a winding cycle. During the winding operation and relative to the arbor 14a, the

arbor 14a moves in a counterclockwise direction toward the winding station and thus permits a successive arbor 18a to arrive at the transfer station. A previously wound roll, held by arbor 16a, is unloaded at the unloading station 16, and an arbor 17a is equipped or loaded with a core in the core loading station 17. It will be appreciated that more or less arbors may be used as desired, and also the various stations may be relocated.

In the instant case, the arbors employed include coni- I are axially movable relative to each other so as to be inserted into the open ends of a core. One of such chucks can be seen in the central portion of FIG. 2 where the same is designated by the letter C. On the other hand, it is possible to use for the arbor means a single rod or mandrel extending across the web, with or without a core, in conventional fashion. For example, the mandrels shown in the above-identified Nystrand application Ser. No. 108,067 may be advantageously employed. In view of the air jet procedure for transferring the leading edge of this severed web, it is unnecessary to employ glue, so that the mandrels can be employed with or without cores.

Still referring to FIG. 3, the web is seen to be partially wrapped around the auxiliary roll 21, also partially wrapped around the first oscillating roll 22, and to a lesser degree partially wrapped around the second oscillating roll 23. Thereafter the path of web travel takes it past the third oscillating roll 24 where the degree of wrap is minimal. The subframe 25 is mounted on a crank mechanism 26 (see FIG. 2) which oscillates the three rolls from the condition of FIG. 3 to that of FIGS. 4-6.

Referring now to FIG. 4, it will be noted that the

rolls

22 and 23 in going from the FIG. 3 position to the FIG. 4 position where they are'designated 22' and 23' have moved in a partial arc around the auxiliary roll 21. In similar fashion, the third oscillating roll 24 has moved in a partial are around a core transfer station 18. It will be appreciated that with the configuration of elements in FIG. 6, the core in station 18 will be free to move counterclockwise to the winding station without any impediment by the third oscillating roll 24. After the roll 24 has moved from its 24" position back to the 24 position of FIG 3, the succeeding core-equipped mandrel can move into the transfer station. Thus, the oscillating movement achieved through the crank mechanism 26 occurs at the beginning stages of a new winding cycle wherein an arbor to which the web has just been transferred is moved toward the winding station 14 while a succeeding mandrel is moved toward the transfer station 18 from the core loading station 17.

An important difference between the configurations depicted in FIGS. 3 and 4 is the disposition of the web W. For example, in FIG. 4 the web has been virtually unwrapped from around the auxiliary roll 21 and has minimal contact with the first oscillating roll 22'. However, the web has been substantially wrapped around the third oscillating roll 24 and around the core in the transfer position 18. With respect to the new core, this partial wrapping of the web is referred to as pre-wrap since the web is wrapped on the new core but it is not yet being wound on the new core. Pre-wrapping of the web on the new or rewind" core 18 at the transfer station facilitates a glueless transfer by trapping a leading edge of the web, after severing, between the core 18 and the web being fed on it during' pre-wrap. It will be observed from a comparison of FIG. 3 (prior to prewrap) and FIG. 4 (pre-wrap established) that the amount of pre-wrap established about the new core 18 by the roll 24 is greater than 180. When the leading edge of the web is trapped on the rewind core and transfer completed, the pre-wrap is removed. The rewind core is then indexed to the winding station and the roll 24 is moved to the position shown in FIG. 3 without changing thelengthof the web being fed to the turret.

This is due to the fact that the amount of wrap removed from the new core 18 is correspondingly increased about the auxiliary roll 21. This maintains web tension constant which is important in holding the unglued web to the core during removal of the pre-wrap and subsequent winding. Thus, I have maintained constant the length of web which extends from the feed rolls 19-20 to the mandrel in the transfer station 18. It will be ap preciated that the arbor chucks in the transfer station 18 and the winding station 14 are rotating. Further, the surface speed of the core in the station 18 is the same as the lineal speed of the web W. The angular speed of the mandrel in the winding station I4 decreases to compensate for the build up of the web thereon.

Through the configuration of the oscillating roll means, consisting of the rolls 22', 23', and 24', I am able to develop a nip 27 for glueless transfer without the disadvantage of relative movement between the web and the core on the arbor 18a. By maintaining constant the length of the web between the feed rolls I9-20 and the contact with the core in station 18 while achieving the nip 27 by pre-wrapping that core, there is the absence of undesirable relative movement between the web and the core at station 18.

Once the nip 27 has been achieved as depicted in FIG. 4, the machine is in condition for cutoff and transfer. The initial step for achieving this is seen in FIG. 5 wherein a nose piece 28 is pivoted downwardly about a pivot center 29 so as to be directed toward and close to the nip 27. The nose piece 28 can be seen in greater detail in the above-identified Nystrand application. The nose piece 28 is seen to include a knife-receiving recess 30 and a bore or passage 31 for the delivery of a jet of air. Also seen in schematic form but which can be seen in greater detail in the above-mentioned Nystrand application is a knife 32. As the knife 32 moves upwardly to the 32' position seen in FIG. 6, the web W is severed and the leading edge of the severed web is directed by the air jet issuing from the bore 31 into the nip 27 where it is picked up by the web partially wrapped around the roll 24' and held against the core on the mandrel 18a. The gap at the nip 27 is relatively small, the surface of the roll 24' being about l/32 inch away from the surface of the core in the station 18. The same degree of spacing exists in the configuration seen in FIG. 3 wherein the third oscillating roll is designated 24. Still further in FIG. 3, there is the same small spacing between the first oscillating roll 22 and the auxiliary roll 21, and this still further applies to the disposition of the first oscillating roll 22' relative to the auxiliary roll 21 in FIGS. 4-6.

I have found it further advantageous to equip the nose piece structure 28 i.e., the arms 33 which pivot around the pivot shaft center 29 with a further roll 34. The function of the roll 34 is to be in pressure engagement with'the web partially wrapped on the surface of the core in station 18 (see FIGS. 5 and 6) to further insure the entry'of the severed leading edge into the nip 27. Optimally, the urging roll 34 includes a center shaft 35 (seen only in FIG. 5) which is driven so as to develop a surface speed on the shell 36 which is slightly greater than the lineal speed of the web W. However, there is an impositive connection between the shaft 35 and the shell 36 by means of a bearing 37 so that there results only a slight urging of the composite roll 34 relative to the web W.

Once cut-off has been achieved as depicted in FIG. 6, the knife 32' retreats to the 32 position of FIGS. 3-5 and the nose piece, or, more properly, the arms 33 rotate clockwise to the position of FIGS. 3 and 4 taking with them the urging roll 34.

Referring now to FIG. 7, which is an enlarged perspective view of the central portion of the machine seen in FIG. 2, the means for oscillating the

rolls

22, 23, and 24 can be seen in greater detail. The numeral 38 designates a pair of spaced-apart plates which rotatably support the three rolls 22, 23, and 24. The three rolls are designated .via their shaft ends and from the position of the third oscillating roll 24 relative to the core equipped arbor 18a. It will be appreciated that the configuration of elements in FIG. 7 corresponds to that shown in FIGS. 4-6, as contrasted to the showing in FIG. 3 where the third oscillating roll 24 is above the core in station 18. To achieve the oscillation previously described, the brackets 38 are supported by two pairs of cranks 39 and 40. More particularly, the crank 39 is pivotally connected to the bracket 38, as at 42, while a similar connection is provided relative to the crank 40 as at 43. In turn, each crank has its own rocker shaft, as at 44 for the crank 39, and 45 for the crank 40. The drives for the two cranks include

gears

46 and 47 which are engaged by adriven gear 48. The gear 48 is driven by the gear 49 through an intermediate gear 50 and cross shaft 51. The gear 49 is caused to rock or oscillate via the motion imparted to its shaft 52 through the rocker arm 53 (see the forward left hand portion of FIG. 7).

Another rocking action is imparted via the arm 54 to the knife 32 (see the central lower portion of FIG. 7).

Also, reference to the left hand portion of FIG. 7 reveals that the auxiliary roll 21 is supported on a fixed support 55 outside of the brackets 38.

The arm 56 of the turret which supports the core in station 18 can be seen in the lower left hand portion of FIG. 7 along with a gear driven friction clutch drive'57 therefor.

I claim:

1. In a web winding machine, a frame, a turret rotatably'mounted on said frame and equipped with a plurality of rotatable arbor means, means for rotating said turret to move each arbor means sequentially between a transfer station and a winding station, feed roll means rotatably mounted on said frame adjacent to said transfer station but spaced therefrom for advancing a web, an auxiliary roll rotatably mounted on said frame between said feed roll means and transfer station, oscillating roll means on said frame including first and second rolls for redirecting the path of travel of said web between said feed roll means and arbor means in said transfer station while maintaining substantially constant the length of web therebetween, means for moving said oscillating roll means between a first position of partially wrapping said auxiliary roll with the advancing web by means of said first roll and a second position to unwrap said auxiliary roll by said first roll and to form a nip with said arbor. means in said transfer station, by means of said second roll of said oscillating roll means, and means operably associated with said frame for severing said web and urging the advancing severed edgeof said web into said nip. v

2. The machine of claim 1 in which said operably associated means includes a roll movable into contact with said web on one arbor means in said transfer station for urging the leading severed edge of said web against said arbor means and into said nip.

3. The machine of claim I in which said oscillating roll means includes a third roll and crank means on said frame for moving said first and third rolls in a partial are about said auxiliary roll and for moving said second roll in a partial are about arbor means in said transfer station.

4. The machine of claim I in which said arbor'means includes a pair of axially spaced-apart chucks insertable into the end of a core. 9

5. The machine of claim 1 in which said arbor means includes a mandrel.

6. In a method of winding a web sequentially on core means without the use of adhesive, the steps of winding a web on a rotating first core means in a winding position while directing the advancing web into partial wrapping relation of at least with an auxiliary roll, moving a second rotating core means into a transfer position adjacent the advancing web, thereafter and prior to cut-off and transfer of said web to said second core means redirecting the advancing web out of wrapping relation with said auxiliary roll and into partial wrapping relation of at least 180 with both said second core means and an oscillating roll positioned in a first position adjacent said second core means and forming a nip therewith, thereafter substantially simultaneously severing said web and urging the advancing severed web edge into said nip, and thereafter moving said oscillating roll to a second position adjacent said transfer position to unwrap a started core means while simulta neously increasing the wrap of said web about said auxiliary roll greater than 180 to maintain constant web length.

7. The method of claim 6 in which said-web is urged against said secondcore means just prior to cut-off and at a point upstream of cut-off in the direction of travel of said web.

8. In a web winding machine of high cyclic rate, a frame;- a turret rotatably mounted on said frame and equipped with a plurality of rotatable, driven arbor means; means for rotating said turret to move each arbor means sequentially between a transfer station and a winding station; means for feeding a web toward said transfer station at a constant speed; an auxiliary roll carried by said frame and engaging said web before i said web reaches said transfer station; movable roll means carried by said frame and including a first roll associated with said auxiliary roll and a second roll associated with an arbor means at said transfer station, said web engaging said first and second rolls before said web reaches said transfer station; means synchronized with said means for rotating said turret for alternately moving said movable roll means to. a first position for establishing a pre-wrap of said web about an arbor means at said transfer station with said second roll of said movable roll means while unwrapping said web from said auxiliary roll with said first roll, and to a secby said first roll to maintain a constant web length be-.

fore said transfer station; and means for severing said web while'in pre-wrap engagement with said arbor means at said transfer station to start winding said web on said arbor means at said transfer station.

9. The apparatus of claim 8 wherein the circumference of each of said arbor means is substantially the same as the diameter of said auxiliary roll; and wherein said first and second rolls of said movable roll means are moved in an arc greater than 180 respectively about said auxiliary roll and arbor means in said transfer station between said first and second positions.

10. The apparatus of claim 8 wherein said movable roll means further includes a subframe movably carried by said frame for holding said first roll and said second roll in fixed position relative to each other such that when said movable roll means is in said first position, the prewrap of said web on said arbor means and the wrap of said web on said second roll is greater than 180, and the wrap of said web on said auxiliary roll and said first roll is removed, and when said movable roll means is in said second position, the pre-wrap of said web is removed from said arbor means and the wrap of said web on said second roll is reduced, and the wrap of said web on said auxiliary roll and said first roll is greater than 180.

11. The apparatus of claim 10 wherein the diameter of said auxiliary roll is the same as the diameter of said arbor means and the amount of web pre-wrap on said arbor means when said movable roll means is in said second position is substantially the same as the amount of web on said auxiliary roll when said movable roll means is in said first position, thereby to maintain the length of said web constant between said auxiliary roll and said arbor means at said transfer station.

12. The apparatus of claim 8 further comprising means for urging the leading severed edge of said web into engagement with said arbor means at said transfer station and beneath the web being wound thereon from said movable roll means to start a new rewinding roll.

13. In a method of winding a web at high cyclic rate on a core without adhesive, the steps comprising: feeding said web at substantially constant speed; engaging an auxiliary roll and a first roll with said web before feeding said web to a core at a transfer station; moving a second roll in an arc about said arbor means in said transfer station to establish a pre-wrap of said web greater than on a rewind core at said transfer station; then severing said web and urging the leading edge between said core and and portion of the web being fed thereon to trap said severed leading edge; and simultaneously and equally moving said first and second rolls respectively in arcs greater than 180 about said auxiliary roll and said arbor means in a direction reverse of the first-mentioned movement of said second roll to remove the pre-wrap of said web on a started core and to increase the wrap of web on said auxiliary roll.

14. The method of claim 13 further comprising the steps of advancing a started rewind core to a winding station and winding said web thereon; moving a new core to said transfer station; then pre-wrapping said new core with said web while simultaneously and in equal amount decreasing the wrap of said web on said auxiliary roll.

Claims

1. In a web winding machine, a frame, a turret rotatably mounted on said frame and equipped with a plurality of rotatable arbor means, means for rotating said turret to move each arbor means sequentially between a transfer station and a winding station, feed roll means rotatably mounted on said frame adjacent to said transfer station but spaced therefrom for advancing a web, an auxiliary roll rotatably mounted on said frame between said feed roll means and transfer station, oscillating roll means on said frame including first and second rolls for redirecting the path of travel of said web between said feed roll means and arbor means in said transfer station while maintaining substantially constant the length of web therebetween, means for moving said oscillating roll means between a first position of partially wrapping said auxiliary roll with the advancing web by means of said first roll and a second position to unwrap said auxiliary roll by said first roll and to form a nip with said arbor means in said transfer station, by means of said second roll of said oscillating roll means, and means operably associated with said frame for severing said web and urging the advancing severed edge of said web into said nip.

3. The machine of claim 1 in which said oscillating roll means includes a third roll and crank means on said frame for moving said first and third rolls in a partial arc about said auxiliary roll and for moving said second roll in a partial arc about arbor means in said transfer station.

4. The machine of claim 1 in which said arbor means includes a pair of axially spaced-apart chucks insertable into the end of a core.

5. The machine of claim 1 in which said arbor means includes a mandrel.

6. In a method of winding a web sequentially on core means without the use of adhesive, the steps of winding a web on a rotating first core means in a winding position while directing the advancing web into partial wrapping relation of at least 180* with an auxiliary roll, moving a second rotating core means into a transfer position adjacent the advancing web, thereafter and prior to cut-off and transfer of said web to said second core means redirecting the advancing web out of wrapping relation with said auxiliary roll and into partial wrapping relation of at least 180* with both said second core means and an oscillating roll positioned in a first position adjacent said second core means and forming a nip therewith, thereafter substantially simultaneously severing said web and urging the advancing severed web edge into said nip, and thereafter moving said oscilLating roll to a second position adjacent said transfer position to unwrap a started core means while simultaneously increasing the wrap of said web about said auxiliary roll greater than 180* to maintain constant web length.

7. The method of claim 6 in which said web is urged against said second core means just prior to cut-off and at a point upstream of cut-off in the direction of travel of said web.

8. In a web winding machine of high cyclic rate, a frame; a turret rotatably mounted on said frame and equipped with a plurality of rotatable, driven arbor means; means for rotating said turret to move each arbor means sequentially between a transfer station and a winding station; means for feeding a web toward said transfer station at a constant speed; an auxiliary roll carried by said frame and engaging said web before said web reaches said transfer station; movable roll means carried by said frame and including a first roll associated with said auxiliary roll and a second roll associated with an arbor means at said transfer station, said web engaging said first and second rolls before said web reaches said transfer station; means synchronized with said means for rotating said turret for alternately moving said movable roll means to a first position for establishing a pre-wrap of said web about an arbor means at said transfer station with said second roll of said movable roll means while unwrapping said web from said auxiliary roll with said first roll, and to a second position for removing said prewrap from said arbor means at said transfer station with said second roll after said web is secured to said arbor means while increasing the wrap of said web about said auxiliary roll and by said first roll to maintain a constant web length before said transfer station; and means for severing said web while in pre-wrap engagement with said arbor means at said transfer station to start winding said web on said arbor means at said transfer station.

9. The apparatus of claim 8 wherein the circumference of each of said arbor means is substantially the same as the diameter of said auxiliary roll; and wherein said first and second rolls of said movable roll means are moved in an arc greater than 180* respectively about said auxiliary roll and arbor means in said transfer station between said first and second positions.

10. The apparatus of claim 8 wherein said movable roll means further includes a subframe movably carried by said frame for holding said first roll and said second roll in fixed position relative to each other such that when said movable roll means is in said first position, the prewrap of said web on said arbor means and the wrap of said web on said second roll is greater than 180*, and the wrap of said web on said auxiliary roll and said first roll is removed, and when said movable roll means is in said second position, the pre-wrap of said web is removed from said arbor means and the wrap of said web on said second roll is reduced, and the wrap of said web on said auxiliary roll and said first roll is greater than 180*.

13. In a method of winding a web at high cyclic rate on a core without adhesive, the steps comprising: feeding said web at substantially constant speed; engaging aN auxiliary roll and a first roll with said web before feeding said web to a core at a transfer station; moving a second roll in an arc about said arbor means in said transfer station to establish a pre-wrap of said web greater than 180* on a rewind core at said transfer station; then severing said web and urging the leading edge between said core and and portion of the web being fed thereon to trap said severed leading edge; and simultaneously and equally moving said first and second rolls respectively in arcs greater than 180* about said auxiliary roll and said arbor means in a direction reverse of the first-mentioned movement of said second roll to remove the pre-wrap of said web on a started core and to increase the wrap of web on said auxiliary roll.