US2989262A - Counter roll winder - Google Patents

Description

June 20, 1961 L. HQRNBOSTEL COUNTER ROLL WINDER 5 Sheets-Sheet 1 Filed May 19, 1958 he 22b? U0 4/ Harnbosfe/ W M W Eff-1 5 June 20, 1961 HORNBOSTEL COUNTER ROLL WINDER 5 Sheets-$heet 2 Filed May 19, 1958 Lloyd Horn bosfe/ M M "272;;

June 20, 1961 L. HORNBOSTEL COUNTER ROLL WINDER 5 SheetsShoet 3 Filed May 19, 1958 June 20, 1961 HORNBOSTEL 2,989,252

COUNTER ROLL WINDER I Filed May 19, 1958 s Sheets-Sheet 4 Lloyd Horn bosfe/ w M W M 2 W 7 HZLZLHE June 20, 1961 L. HORNBOSTEVIL 2 COUNTER ROLL WINDER Filed May 19, 1958 5 Sheets-Sheet 5 U090 Hombosfe/ United States Patent 2,989,262 COUNT R ROLL WINDER Lloyd Hornbostel, Beloit, Wis., assignor to Beloit Iron Works, Beloit, Wis., a corporation of Wisconsin Filed May 19, 1958, 'Ser. No. 766,295 12 Claims. (Cl. 242- 56) The present invention relates to improvements in winding machines and particularly to an improved automatic winding machine which will continuously wind rolls of sheet material on cores from a parent roll and will automatically operate to discharge completed rolls from the machine when they are wound, cutting the strip of supply material and deliver a fresh core to the machine and start winding the cut lead end of the supply strip on the new core.

The invention contemplates the provision of first and second winding drums positioned to extend parallel to each other and driven in rotation to form a winding nest therebetween wherein a roll is supported while being wound. A supply strip of sheet material is fed from a parent roll over the first drum which is rotated toward the second drum to be wound on the roll. A pressure loaded rider roll bears down against the wound roll to hold it against the winding drums. Fresh winding cores are supplied froma magazine and are individually transferred by a first or primary transfer member consisting of a pair of transfer arms engaging the ends of the core and carrying it to the winding nest. A second transfer member consisting of a pair of transfer arms lifts the completed roll from the nest, rolling it over the top of the second winding drum to eject it from the machine. The transfer members are operated by a common drive which is controlled by a control mechanism operative in response to the wound roll reaching the desired diameter and lifting the rider roll. The common operating means first moves the second transfer member to carry the wound roll out of the nest and subsequently moves the first transfer member to move the fresh core into the nest while the rider roll starts the core spinning be fore it engages the paper. The control means operates a knife to sever the supply strip of sheet material and also operated a blower to carry the cut lead end of the strip against the fresh core. The control also operates a spray to spray liquid against the fresh core to cause the paper to adhere thereto.

An object of the invention is to provide a completely automatic machine which will form successive rolls of sheet material supplied from a parent roll.

A further object of the invention is to provide an improved automatic machine having a magazine for the supply of fresh cores for winding a supply strip of sheet material with means to transfer the cores to a Winding nest and to start them rotating before reaching the winding nest and to automatically sever the sheet material and start it winding on the new core when a previous roll has been wound.

Another object of the invention is to provide an improved means for handling the core as it is being wound, holding it in the winding nest and transferring the core from the winding nest to eject it from the machine.

A still further object of the invention is to provide an improved automatic winding machine for winding successive counter rolls of paper from a large parent roll which has improved features of automatic operation, making it especially well adapted to high speed automatic operation and making it reliable for continuous unattended operation.

Other objects and advantages will become more apparent with the teaching of the principles of the invention in connection with the disclosure of the preferred 2,989,262 Patented June 20, 1961 embodiment in the specification, claims and drawings, in which:

FIGURE 1 is a side elevational view of a winding machine embodying the principles of the present invention;

FIGURE 2 is a sectional view shown in enlarged detail and taken along the line i[I-II of FIGURE 1; and

FIGURES 3-9 are diagrammatic views showing the elements in sequential positions during the steps of operation of the machine.

As shown on the drawings:

, For convenience of description, the disclosure of the winding machine and its operation will be divided into three parts. The description will be presented under the headings Over-all machine, Steps of operation, and Machine details.

Over-all machine As illustrated in FIGURE 1, the machine includes a pair of cylindrically shaped, horizontally extending, .parallel spaced winding drums with a first drum shown at 10 and a second drum shown at 12. The space between the upper surface of the drums defines a winding nest 14 in which is located a roll 16 which is driven in rotation by the drums which are simultaneously rotated at the same speed and angular direction as indicated by the arrows 18 and 20. The roll is wound on a core 22. From a suitable source and guided by roll 37, a supply web or strip 38 passes over the drum 10. A plurality of fresh cores such as shown at 22b and 22c and 22d are carried in a supply magazine 24. Individual fresh or unwound cores are transported from the magazine 24 to the winding nest 14 by a transfer member 26. The transfer member moves in an arcuate path to carry a core 22a toward the nest and a cam 28 holds the core out of contact with the stop until it can be started rotating. While in the nest, the rolls are held against the winding drums 10 12 by a rider roll 34. The woundcores, when they reach the proper size, are transferred out of the nest by a second transfer member 30. In being carried out of the nest 14, they are rolled up over the top of the second winding drum 12 to an ejecting position 16a. The cores are held by the second transfer member and are held down on the drum 12 by a pressure arm 32 which bears against the core 22. 7

As the wound rolls are transferred from the nest 14, a knife 36 moves upwardly and slits the supply strip 38 which is being wound on the roll. A spray nozzle 40 sprays water against the fresh core 22a being delivered to the nest 14 and an air stream blown from a jet 42 blows the cut lead end of the strip against the new core to start it winding.

Steps of operation The series of positions of the elements of the machine in the steps of operation are shown in FIGURES 3-9 and like numbers indicate like parts and may be corresponded with the structure of FIGURE 1.

A fresh core 22a is first received by the transfer member 26 as will later be discussed in connection with FIG- URE 3, inasmuch as this may be regarded as occurring at either the beginning or the end of operation.

Starting the operation of the machine, as shown in FIGURE 4, a roll *16 supported on the winding drums 10 and 12 becomes fully wound. When it reaches a predetermined diameter, it lifts the rider roll 34 moving its supporting arm 35 upwardly to operate the switch 37. This starts a control mechanism in operation to move various elements and cause them to perform functions as will be described. 7

At this time, the secondary transfer member 30 which also may be referred to as a transfer arm, begins to move in a clockwise direction, as shown in FIGURE 4. At the same time, a pressure which has been applied to the rider which may also be referred to as the first transfer arm,

delays its action until the second transfer arm 30 has .moved a distance and then begins transferring the fresh core 22a. The cam 28 supports the core and holds it up offthe supply strip 38 of sheet material.

As illustrated in FIGURE 6, the rider roll 34 rides down off of the wound roll 16 to engage the supported core 22a. The rider roll 34 is spinning, since it was driven by engagement with the wound roll 16, and will, therefore, start the fresh core 22a rotating and accelerate it. In view of the light Weight of the core, its surface speed will approach the speed of travel of the strip of sheet material 38 to thereby be ready to start winding the fresh end of the strip after it is out.

As shown also in FIGURE 6, the knife moves upwardly between the drums and 12 a short distance and this movement coacting with the control mechanism, starts spraying water against the empty fresh core 22a from the nozzles 40. This also starts air blowing against the underside of the supply strip 38 from the air jet nozzles 42.

As shown in FIGURE 7, the first arm 26 continues moving in a clockwise direction, and the core will drop off the cam 28 to engage the first winding drum 10. At this point, pressure is again added to the rider roll 34 to press the core 22a against the drum 10.

The knife moves the rest of the way upwardly to engage the supply sheet 38 and sever it to provide a lead end 38a to start winding on the new core 220, and to form a cut trailing end 38b which will finish the wound roll 16.

The lead end 38a will be forced upwardly to be caught in the nip 44 between the rider roll 34 and the core 22a and will adhere to the wet core to start winding thereon.

The knife 36 will return in a downward direction between the winding drums 10 and 12, and will shut ofif the stream of water from the nozzles 40 and the air jet from the air nozzles 42.

As illustrated in FIGURE 8, the first arm 26 stops its clockwise movement with the core 22a in the winding nest 14 and being wound from the supply strip 38. The second transfer arm 30 also stops its clockwise movement and at that time the pressure arm 32 releases to release the core 22 of the wound roll 16. This permits the wound roll to move away from the machine and be ejected.

At that time, the control mechanism of the machine operates to start operation to return the second arm 30 and the first arm 26. There is a delay in the drive mechanism for the arms and the second arm 30 first begins moving back to the winding nest 14.

As shown in FIGURE 9, the second arm 30 returns .to engage the core 22a and the pressure arm 32 again applies pressure to the core. By this time, material will .have been wound on the core and it will have raised in the nest 14 to lift the core away from the first arm 26 and the first arm will then move in a counterclockwise direction back to its starting position.

When the first transfer arm 26 reaches its starting position, it will engage trip mechanism 46 to release the next succeeding fresh core 22b from the magazine 24, FIGURE 3. This will prepare the machine for a similar sequence of operations and operation of the machine will continue automatically as long as a continuing supply strip 38 is fed into the machine.

Machine details The machine is provided with a frame column 46, as illustrated in Figure 1, on one side of the machine. Inasmuch as the machine is symmetrical in construction, with the winding drums extending across the machine to the 4 side opposite from that shown in Figure 1, only one side need be illustrated for clarity of description. It will be understood that the opposite side of the machine is substantially identical in construction, and that the winding drums and other rolls or cylinders of the machine extend laterally across for a length required to wind sheet material of the width provided.

The frame column 46 is provided with bearings 48 and 50 rotatably supporting the winding drums l0 and 12. The drums 10 and 12 are supported on shafts 52 and 54, respectively, which are interconnected such as by gearing for rotation in the same direction and at the same speed, drive mechanism, not shown.

Another transfer arm similar to the first transfer arm 26 is provided on the other side of the machine and the arms are interconnected to move simultaneously. The transfer arm 26 is shown as pivotally supported for movement about a pivotal point coaxial with the drum shaft 52. The first transfer arm 26 has a U-shaped outer end 56 to provide a pocket 58 with a leading side 60 and a longer trailing side 62 to receive and transfer the cores.

The cores, such as 22a, as shown in detail in FIGURE 2, are provided with annular grooves 64 and 66 to form smaller lines for the core ends. The cores of FIGURES 39 are shown with the hub at the end of simplification of the schematic drawings. The sides 60 and 62 of the first transfer arm 26 engage the inner groove 64 of the core to transfer the core laterally and the cam 28 will engage the base of the groove 64 to support the core. The second transfer arm 30 will engage the outer groove 66 as will later be described in connection with the detailed view of FIGURE 2.

The magazine 24 has a side 68 with a similar side on the other side of the machine and has a pair of rails 70 therein spaced to enter the grooves 64 of the cores. A plurality of core holders 72a, 72b and 72c are pivotally mounted in the magazine and have arcuate faces 74a, 74b and 740 on the outer end to engage and hold the cores. A release rod 76 is slidably mounted for reciproeating movement in the direction of movement of the cores and is connected at a midpoint at each of the holders 72a, 72b and 720. The release rod 76 has a follower roller 78 which is engaged by shoulder 80 on the first transfer arm 26 when it is moved back to the position shown in FIGURE 1. When the arm 26 moves to the right, the holders permit each of the cores to move down one location and be stopped by a bellcrank shaped trip 82. The trip 82 is also pivotally mounted on the magazine and is pivotally secured to the rod 76. An upper arm 84 on the trip projects into the path of the lowermost core and will release it when the rod 76 is pushed by the first transfer arm 26 to permit the core to drop down into the pocket 58.

When the rod 76 is released, the cores roll down and are stopped with core 22c moving to position 22'c, and

core 22b moving to 22b, as shown in FIGURE 1.

The transfer members 26 and 30 are driven by a control shaft 86 carrying a sprocket 88. The sprocket 88 drives a chain 90 passing over sprockets 92 and 94 in driving connection with the transfer arm 26 and the second transfer arm 30. The chain also passes over a tightening sprocket 96. The sprocket 94 is connected directly to the transfer arm 30 while the sprocket 92 connects to the first transfer arm '26 only through a space dclay lug 98. The lug 98 is connected to the sprocket 92 and in one direction of movement engages a shoulder 100 on the arm 26 and in the other direction of movement engages a shoulder 101, which is arcuately spaced from the first shoulder. Thus, although both the first transfer arm 26 and the second transfer arm 30 are driven by a common drive chain 90, the space delay connection will cause a deferment in the movement of the first arm 26 after movement of the second transfer arm 30 in the manner described in connection with FIGURES 5 and 9.

Another arm similar to the second transfer member 30 will be located at the other side of the machine pivoted to transfer the other end of a wound core. The transfer arm 30 is mounted for pivotal movement coaxial with the drum shaft 54. The arm carries a vertically extending slot 102 with vertical sides which permit it to slide over the groove 66 of the core 22 as shown in FIGURE 2. At its inner side, the slot 102 has a plate 104 against which the surface of the base of the core groove 66 rides. Located at the other side of the slot 102 is a plate 105 which does not enter the groove 66 of the core, but engages the end 7 of the core. The pressure arm 32 is secured to a pivotal crank pin 106 carrying an arm 108 at its other end. The arm 108 is secured to a piston rod 110 which is connected to a piston slidable in a cylinder 112 carried on the arm 30. A pressure line 114 for pressurized air or other fluid leads into the upper end of the cylinder 112 in order that a downward pressure may be applied to the piston rod 110 and cause the arm 32 to push downwardly on the core thereby holding it down in engagement with the winding drum 12, This is especially useful in rolling the completed roll up over the top of the drum in the manner illustrated in FIGURES 5, 6 and 7. Pressure is released from the cylinder 112 when the completed roll 16 is ejected in the manner shown in FIGURE 8.

The air pressure to the line 114 is controlled by a pressure valve which is electrically or cam operated to be controlled by the main control shaft 86. This control shaft is suitably driven by a motor or the like, not shown, and its operation is initiated by operation of switch 37. The control members operated by the control shaft are not shown, but as will be appreciated by those skilled in the art, may be of a suitable nature for operating the elements with rotation of the control shaft 86.

The rider roll 34 is rotatably carried in bearings 116 supported on the rocker arm 35. The rocker arm is pivotally supported on a shaft 118 of the frame and the end of the arm opposite the bearings is connected to a piston rod 120 connected to a piston slidably mounted in a cylinder 122. An air line 124 connects the cylinder to force the rider roll 34 downwardly and apply pressure to the wound roll 16. Air to the line 124 is controlled by a cam or switch operated valve, not shown, actuated by the control shaft 86.

The knife 36 is carried at the end of a pivotal arm 128 mounted for movement about an axis coaxial with the shaft 54. Also carried on the am 128 is the air jet nozzle 42. The knife 36 extends across the machine so as to be able to engage the supply sheet 38 and sever the entire strip.

The knife carrying arm 128 is moved up and down by a connected arm 129 secured to a link 130 which in turn is connected to a crank arm 132. Arm 132 is connected to a pivotal shaft 134 to which is secured an arm 136 which carries a follower 140 which bears against a cam 142 mounted on the control shaft 86. A piston rod 144 is connected to a piston slidably located in a cylinder 146 and is connected to the arm 136 of the bell crank. Air pressure supplied through a line 148 holds the follower 140 against the cam 142 As the cam rotates, the knife and nozzles are moved upwardly and movement of the knife will actuate the air jets 42 and the water supply to the water nozzles 49. This may be done by a control switch or the like opening valves to cause the spray of water and the fiow of air in the manner discussed in connection with FIGURES 6 and 7. When the cam 142 has rotated a portion of its total 360 through which it is driven for each cycle of operation of the machine, follower 140 will drop down into cam recess 2 to rapidly move the knife 136 upwardly to cut out the supply sheet. Continued rotation of the cam 142 returns the knife 36 to its position out of the path of the strip 38.

In summary of operation of the machine, a first roll is started by starting the lead end of the supply strip 38 around a first core 22 and the core is positioned in the winding nest 14 to be driven in winding rotation 'by the drums 10 and 12 and pressed downwardly by the free rotating rider roller 34. When the roll builds up so that switch 37 is actuated, the second transfer member carries the completed roll up over the top of the drum 12 and the first transfer member 26 carries a fresh core 22 which was previously received from the magazine 24 into the winding nest 14. Before reaching the winding nest, the rider roll 34 starts the core rotating and the cam 28 holds the core out of contact with the strip until the core is dropped into the nest 1 4. Water is sprayed against the roll from nozzles 40 and the supply strip of sheet material is cut by the knife 36 and the cut end is blown up by air from the nozzles 42 to start winding on the new core.

Thus, it will be seen that I have provided an improved winding machine which meets the objectives and advantages hereinbefore set forth. The machine achieves a completely automatic mechanism for winding a series of rolls from a parent roll and automatically feeds fresh cores to the machine, cutting the material and delivering the wound rolls from the machine.

I have, in the drawings and specification, presented a detailed disclosure of the preferred embodiments of my invention, and it is to be understood that I do not intend to limit the invention to the specific form disclosed, but intend to cover all modifications, changes and alternative constructions and methods falling within the scope of the principles taught by my invention.

I claim as my invention:

1. A machine for winding rolls of sheet material from a supply strip which comprises a supply magazine for holding cylindrical unwound winding cores, first and second parallel winding drums forming a winding nest therebetween for cradling a core being wound with a supply strip of sheet material, a rider roll movable and supported to rotatably bear against the core and press it against said winding drums as the core is being wound, means for holding the rider roll against the core as it is being wound in the nest, a first transfer membertransferring individual cores from said magazine to said nest having .a positive control over the cores during transfer in a path substantially parallel to the surface of one of the drums, means for driving said transfer member in movement from the magazine to the nest, means holding said cores out of contact with the winding drums for a substantial portion of their movement by said first transfer member, a second transfer member transferring 'in dividual cores from the nest after they have been wound, means for driving said second transfer member in movement from the nest to remove the wound cores, cutting means for cutting the supply of sheet material after a core has been wound to form a lead end to start winding on a new core, means for applying water to the core as it is moved by said first transfer member, and means for carrying the cut lead end of supply sheet material into the nip between the rider roll and the core to start the end winding on an unwound core.

2. A machine for winding rolls of sheet material from a supply which comprises first and second spaced parallel winding drums forming a winding nest in the space between them for cradling a core on which an endless supply of sheet material is to be wound and driving the core in rotation with the strip of sheet material being fed over the first drum to be wound on a roll in the nest, a sup ply magazine for holding cylindrical winding cores, a first transfer member transferring individual cores in a path substantially parallel to the surface of one of the drums from said magazine to said nest having positive control over the cores during transfer, means for driving said transfer member in movement from the magazine to the nest, means holding said cores out of contact with the winding drums for a substantial portion of their movement by said first transfer member, a second transfer member transferring individual cores from the nest after 7 they have been Wound, means for driving said second transfer member in movement from the nest to move the wound cores, and cutting means for cutting the supply of sheet material after a core has been wound to form a lead end to start winding on a new core.

3. A machine for sequentially winding rolls of sheet material from an endless supply strip which comprises a pair of spaced parallel winding drums forming a winding nest therebetween in which a core is to be wound with a supply strip of sheet material and is to be carried and driven in winding rotation therein, a supply magazine for holding a series of unwound cylindrical winding cores, a first transfer member positioned to move from the magazine to said nest for transferring individual cores in a path substantially parallel to the surface of one of the drums to be wound having positive control over the cores during transfer, means holding said cores out of contact with the winding drum for a substantial portion of their movement by said first transfer member, a second transfer member movable away from said nest for transferring wound cores out of the nest, a rider roll rotatably supported on an axis parallel to the winding drums and supported to rotatably bear against a core and press it against the winding drums as the core is being wound in the nest, a cutter for cutting the supply strip after a core is wound and forming a lead end for winding on a fresh core, and means starting said lead end to wind on a core as it is transferred into said nest by said first transfer member.

4. A mechanism for automatically winding sequential rolls of sheet material from an endless supply which comprises a pair of spaced parallel winding drums positioned to form a winding nest between them to support and rotatably drive a core on which a supply strip of sheet material is to be wound, a rider roll positioned above the winding drums to engage a core as it is being Wound and urge it into driven rotational engagement with the winding drums, a first transfer member movable in a path to transfer a fresh core to the winding nest having positive control over the core during transfer, a second transfer member movable in a path to transfer a wound core out of the winding nest, means for guiding the path of movement of the rider roll to move out of engagement with the wound roll as it is being carried from the nest by the second transfer means and to automatically move into engagement with the fresh core as it is being moved into the winding nest whereby the core will be driven in rotation to start the winding of the sheet material, and means operative to automatically cut the strip of material when a wound roll is being transferred out of the nest to form a lead end for winding on the fresh core.

5. A machine for winding rolls of sheet material from a supply which comprises a pair of parallel spaced winding drums positioned to form an upwardly facing core supporting nest therebetween for winding a supply of strip material on a core, means for driving the winding drums to rotate the core as material is being wound, a rider roll positioned to engage the upper surface of the core as it is being wound in the nest and rotate therewith holding the core in engagement with the drums, a first transfer member movable in a path and adapted to carry a fresh core into said nest for winding, means for cutting the supply strip of material after a core is wound, a second transfer member movable in a path to remove a wound core from the nest, and means to guide the path of the fresh core on the first transfer member to engage the rider roll to start the core rotating before it is positioned in the nest whereby the lead end of the cut strip can begin winding on the fresh core.

6. A machine for winding rolls of sheet material from a supply strip which comprises a pair of winding rolls disposed in parallel spaced relation to define a Winding nest therebetween wherein a wound core is supported and driven in rotation, a first transfer member adapted to support a core to be wound and movable in a path into the nest to deliver a fresh unwound core having positive control over the core during transfer into the nest, a second transfer member movable in a path from the nest to remove a wound core, a common drive means for said first and second transfer members, means responsive to the size of a wound core in the nest connected to operate said common drive means when a core is wound to form a completed roll, and a space delay device deferring driving connection between the common driving means and the first transfer member for a predetermined amount of movement whereby the second transfer member may re move a wound roll from the nest before a fresh core is deposited therein.

7. A machine for winding rolls of sheet material from a supply strip which comprises a pair of spaced parallel winding drums forming a winding nest therebetween with a core to be wound supported on the drum surfaces and driven in rotation thereby. means for driving the drums to rotate the core, an endless strip of material being fed over one of the drums into the winding nest to wind on the core, a first transfer member movable in a path to deliver a fresh unwound core to said nest having positive control over the core during transfer to said nest, means holding said cores out of contact with the winding drums for a substantial portion of their movement by said first transfer member, a second transfer member movable in a path to remove a wound core from the nest, a cutting knife for cutting the strip of material after a core is wound to form a lead end for winding on a fresh core, a control means position to be in engagement with a roll and moving away from said nest with increase in roll size and operative in response to a roll being fully wound, means for driving said transfer members and connected to be operated by said control means, and means for driving said knife in a path to intersect the path of the strip of sheet material and connected to be operated by the control means whereby the strip is cut when a roll is completed.

8. A machine for winding rolls of a sheet material from a supply strip which comprises a winding station defined by parallel spaced rotatable Winding drums, first and second transfer members movable in a path to remove a complete wound core from the winding station and to deliver a fresh core to said station, said first transfer memher having positive control over the core during transfer to said winding station, means holding said cores out of contact with the winding drums for a substantial portion of their movement by said first transfer member, driving means for said transfer members, a knife movable in a path to intersect a supply strip of material being wound on the core to cut the strip and form a fresh lead end for winding on a fresh core, driving means for moving the knife, a spray nozzle positioned to spray liquid on a fresh core in order that the cut end of the supply strip will adhere thereto, an air nozzle positioned to force the lead end of the cut strip against a fresh core, and common control means in a position to be in engagement with a roll and moving away from said nest with in crease in roll size and connected to operate said spray nozzle and said air nozzle and connected to be operative when a roll in the winding station is fully wound.

9. A machine for winding rolls of sheet material from a supply strip which comprises first and second parallel adjacent winding drums forming a winding nest between them, a first transfer member movable in a path for bringing fresh cores into the winding nest to be wound, a second transfer member for removing wound cores from the nest, a cutting knife movable in a path to sever the supply strip when a core has been wound, supporting arms for the knife pivotally mounted to move the knife in a path coaxial with one of said winding drums, and operating means connected to said arms to move the knife to intersect the supply strip during operation of said second transfer member in removing the wound roll from the nest.

10. A machine for windin g rolls of sheet material from a supply strip which comprises first and second parallel adjacent winding drums forming a winding nest therebetween, a first transfer member movable in a path for bringing fresh cores into the winding nest to be wound, a second transfer member for removing wound rolls from the nest, a cutting knife movable in a path to sever the supply strip when a roll is wound, an operating arm connected to said knife for moving it to cutting position, means biasing said operating arm toward cutting position, a rotatable cam, and a follower engaging said cam and connected to said operating arm, said cam shaped to prevent movement of said operating arm toward said cutting position for a substantial portion of rotation of a the cam and having a drop-off point wherein the arm is suddenly released to be rapidly biased to cutting position.

11. A mechanism for winding rolls of sheet material from a supply strip which compiism first and second adjacent winding drums forming a winding nest between them, a first transfer member movable in a path for bringing fresh cores into the winding nest to be wound, a second transfer member for moving wound rolls from the nest, first driving means for said first transfer member, second driving means for said second transfer member, a cutting knife movable in "a path to intersect the supply strip after a roll has been wound, an operating member for driving said cutting knife, means for biasing said operating member in a direction to move the cutting knife to cutting position, a rotary cam, a follower connected to said operating member and in engagement with said cam, said cam having a drop-off portion permitting the operating memher to move the knife to cutting position, and a drive connecting means connected to said cam and to said first and said second driving means so that said transfer members and knife will be operated in related sequence.

12. A machine for winding rolls of sheet material from a supply strip which comprises a pair of spaced parallel winding drums forming a core supporting nest therebetween and for driving the core in rotation while it is being wound, first transfer means movable in a path to carry a fresh unwound core into said nest having positive control over the core during transfer, second transfer means movable in a path to transfer a wound roll out of said nest, cutting means for cutting the end of the strip being wound on the roll to form a lead end for winding a fresh core, means for delivering the lead end to a fresh core, and means for accelerating a fresh core in rotation while it is being transferred by said first transfer means into said nest and before it is driven in rotation by said drums, said fresh core being moved into contact with one of the drums before it receives said lead end.

References Cited in the file of this patent UNITED STATES PATENTS 1,613,381 Cameron Ian. 4, 1927 1,934,913 Crisp Nov. 14, 1933 1,946,801 Malkin et a1 Feb. 13, 1934 2,520,826 Beck Aug. 29, 1950 2,537,588 Husson Jan. 9, 1951 2,845,231 Grettve July 29, 1958 2,877,959 Aaron et a1 Mar. 17, 1959

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