MXPA99011172A - Surface winder with pinch cutoff - Google Patents

Abstract

A surface winder includes first (20) and second (22) winding rolls for winding a web on a center member, a stationary surface (27) spaced from the first winding roll for rolling a center member on the stationary surface, and a pinch pad (24) for pinching the web against a pinch surface upstream of the center member (c) and thereby severing the web. The first winding roll is provided with a high friction surface, and only a short length of web needs to be stretched between the pinch surface (25) and the first roll to tension and sever the web. The severed web is wound on the center member (c) as the center member rolls on the stationary surface.

Description

DEVANATING YOUR PERFECTION WITH PRESSURE CLIPPING BACKGROUND This invention relates to a winder for winding a continuous paper in rolls or rolls. More particularly, the invention relates to a surface winder, which includes a rotary pressure cushion, which compresses the continuous paper against a stationary surface to split the continuous paper. Redevelopers are used to convert large parent rolls of paper into retail size rolls and toilet paper and paper towels. Commonly used are two types of redevadoras - redevanadoras of center and redevanadoras of surface. Center redevelopers are described, for example, in the US reissue patent no. 28, 353 and wind the web in a core, which is rotated by a mandrel. Surface redevelopers are described, for example, in U.S. Pat. 4, 723, 724 and 5, 104, 055 and wind the web in a core, which is rotated by a three-roll support. The critical operation in both the center redefining and the surface redevelopment is the sequence of steps referred to as trimming and transfer. The continuous paper must be split at the end of the winding of a roll, the leading edge of the continuous paper must be transferred to a new core, and the new core must be turned to start winding a new roll. These steps must be accomplished repeatedly and reliably, while the continuous paper is moving at high speed. It is also desirable that each roll has an exact sheet count and that the web be rolled uniformly and substantially without wrinkling. In the US patent no. 4, 723,724, a stationary plate or dead plate (21 7 in Figs. 1 1 - 1 5; 31 7 in Fig. 1 8; 41 7 in Fig. 18A) is used upstream of the second coil wound to initiate rotation of the core and to transfer the continuous paper to a core equipped with glue. The core compresses the continuous paper against the stationary plate to tension and split the continuous paper, and the paper is wound on the core as the core rolls along the stationary plate. In Figures 11-15, a rotary pressure arm 221 presses the web against an upper belt 209 to isolate a line of perforations P in which the web is split. U.S. Patent No. 5, 137, 225 also discloses a surface rewinder, which uses a stationary surface to effect temporary braking of the web between the stationary surface and the core, thereby causing tearing of the web between the newly finished web and the incoming core. This process, which uses the core to compress and slow down the continuous paper, stretches the web from the core pressure point to the finished coiled roll to nibble a hole between the two points. This long distance between the core and the finished roll must be lengthened by at least the percentage of stretch in the material, commonly 6 to 25%. This elongation is created by the core being compressed to the stationary surface, the speed of core insertion being less than the speed of the continuous paper. Indeed, there is at least the same amount of loose continuous paper generated upstream of the inserted core as required to lengthen and break the continuous paper downstream of the core, plus the distance that the core must still travel before it reaches the first roll. of winding and accelerate at the speed of the continuous paper. Problems with this method are the significant amount of loose paper generated upstream, and the difficulty in running short perforations which result in more than one perforation between the inserted core and the finished coiled roll. The excess of relaxation generated causes problems of uncontrollable wrinkling and tension of the continuous paper, which limit the speed of the machine. The large distance from the core to the finished coiled roll also limits the length of the perforation that can be run, and the maximum stretch that can be run. This method also requires a rigid core to compress the continuous paper to the stationary surface to minimize the slippage of the continuous paper as it is stretched, thus increasing the cost of the cores. European patent 0 694 020B 1 uses a cushion / presser member to cooperate with the surface portions of the first winding roll, which have a low coefficient of friction. This low coefficient of friction in the first winding roll is highly undesirable since it allows winding products to become unstable during winding due to sliding between the product and the winding drums. This is explained in US Pat. Nos. 5, 370.335 and 5, 505.405.

BRIEF DESCRIPTION OF THE INVENTION The invention solves the above problems. The invention uses a pressure cushion, similar to that described in the co-owned US patent no. 4, 723,724, in combination with a first winding roll surface, which has a high coefficient of friction (i.e., an aggressive surface). This combination results in a very short continuous paper distance between the pressure pad and the aggressive surface of the first roll of winding. Only this short length of continuous paper needs to be stretched to create separation and transfer of continuous paper. The elongation of the paper is not required all the way to the coiled roll. The second advantage of short distance is that there is considerably less elongation required to split the web, which results in considerably less loose web generated upstream of the inserted core. The combination also allows the use of cores with considerably less firmness.

The pressure cushion is located upstream of the first winding roll where it can press against a dead plate having a low coefficient of friction, which allows the first roll of winding to have a surface with a high coefficient of friction. The result is a shorter continuous paper length for splitting the continuous paper and a high friction surface in the first winding roll both to split the continuous paper and to eliminate the sliding during the winding.

DESCRIPTION OF THE DRAWINGS The invention will be explained in conjunction with illustrative embodiments shown in the accompanying drawings, in which Figure 1 illustrates a surface re-builder formed in accordance with the invention before a new core is inserted; Figure 2 shows the core and pressure cushion just before the continuous paper is compressed; Figure 3 shows the start of the compression of the continuous paper; Figure 4 shows the partition and transfer of the continuous paper to a new core; Figure 5 shows the end of the compression of the continuous paper; Figure 6 shows the continuous paper being wrapped around a new core; Figure 7 shows the new core that continues to wrap the continuous paper; Figure 8 illustrates a surface trimmer with a modified pressure arm; Figure 9 illustrates another embodiment of a pressure arm and a spring retainer for the new core; Figure 1 0 illustrates the pressure arm of Figure 9 with a different stationary plate; Figure 1 1 illustrates a re-winder which is formed according to the invention, which winds the web in recirculated mandrels; Figure 12 is an extended view of the three roll winding support of Figure 11; Figure 1 3 illustrates the trimmer of Figure 1 1 as the continuous paper is compressed and split; Figure 14 illustrates the transfer of the continuous paper to a mandrel; Figure 1 5 illustrates a rewinder, which winds the web in hollow cores; Figure 1 6 is an extended view of the three roll winding support of Figure 15; Figure 1 7 illustrates the trimmer of Figure 1 5 as the continuous paper is compressed and split; Figure 1 8 illustrates the transfer of continuous paper to a core; Figure 1 9 illustrates a trimmer similar to the trimmer of Figure 1 5 with a modified core delivery mechanism; Figure 20 is an extended fragmentary view of the core delivery mechanism of Figure 1 9; and Figure 21 is an enlarged fragmentary view of a portion of Figure 20.

DESCRIPTION OF SPECIFIC EMBODIMENTS Referring to Figure 1, a surface rewinder includes a conventional three-roll winding support, which includes a first winding roller or upper winding roller 20, a second winding roller or lower winding roller 21, and a master roller 22. The rollers rotate in the direction of the arrows to wind a continuous paper W in a hollow core cardboard C to form a roll L of paper wound by convolucíones, such as, toilet paper or paper towels. The web is advanced in a downstream direction as indicated by the arrow A and preferably drilled transversely along longitudinally spaced lines of perforation to form individual sheets. The first winding roller 20 preferably has a uniform outer surface with a high coefficient of friction, so that the continuous paper does not slide on the rotating roller. For example, the surface can be formed from tungsten carbide 600 RA, which extends over the entire surface of the roller, which is meshed with continuous paper. The first winding roller rotates at the speed of the web. The second winding roller 21 can be movably mounted on the rewinder, so that the roller can move towards and away from the first winding roll as described in US Pat. 4,828, 1 95 and 4, 909,452. The second winding roller may also have a variable speed profile as described in U.S. Pat. 5,370,335. The master roller 22 is mounted as a pivot, so that it moves away from the second roller as the winding roll is formed. Before the continuous paper reaches the first winding roller 20, it travels on a stationary pressure bar 24, which is mounted adjacent to the first winding roller. The pressure bar has a pressed surface to the continuous paper 25, which has a relatively low coefficient of friction, so that there is little or no entrainment in the continuous paper during the normal winding. In one embodiment, the pressure bar surface 25 was formed from mild steel. A stationary plate 27 (also referred to as a transfer plate or dead plate) is mounted below the first winding roller 20 upstream of the second winding roller 21. The upstream end 28 of the stationary plate is separated from the first winding roller at a distance slightly greater than the diameter of the cores C. The spacing between the remainder of the stationary plate and the first winding roll is slightly smaller than the diameter of the cores, so that the cores will be slightly compressed and will be rolled along the stationary plate by the rotary winding roller. The stationary plate preferably has a high friction surface, for example, tungsten carbide, in order to start the core rotation as soon as possible. A pressure arm 30 is mounted on a rotatable arrow 31. Either of a single pressure arm or a plurality of axially spaced pressure arms can be mounted on the arrow 31. The pressure arm includes a core engaging surface 32 and a pressure cushion 33. The pressure cushion is preferably formed from docile, compressible, resilient, high friction material, such as polyurethane or rubber. Shore A. The cushion can also have a high durometer surface on a low durometer base to decrease wear. Figure 1 illustrates the pressure arm in the process of advancing a core C along a curved core guide 35 towards the first winding roller 20 and the stationary plate 27. The circumferential rings of adhesive have already been applied to the core in the conventional way. The pressure arm 30 and arrow 31 can be provided with a vacuum port 36 to hold the core against the pressure arm. Figure 2 illustrates the pressure arm moving the core into the space between the upstream end 28 of the stationary plate and the first winding roller 20. The pressure pad has been accelerated to approximately one-half the speed of the continuous paper . The core travels near the continuous paper, but do not press the continuous paper. The pressure cushion 33 has not yet engaged the web, and the paper continues to be wound on the roll L. Figure 3 illustrates the start of web press. The perforation P, which forms the last sheet to be wound on the roll L, in order to give a desired exact sheet count, is represented by a gallon and is located on the first winding roll just downstream of the core C. The pre-drilling P2 is also on the surface of the first winding roller. The pressure cushion 33 begins to compress the web paper W against the stationary pressure surface of the pressure bar 24.

In Figure 4, the pressure cushion 33 continues to compress the web against the pressure bar, and the web has slowed sufficiently and stretched sufficiently, so that the web is split into the perforation. ,, which is closer to the pressure bar. Due to the high friction surface in the first winding roller 20, the web is not stretched to any significant degree between the perforations P-, and P2. Because the continuous paper has decreased its velocity at the pressure point, a small amount of relaxation S develops on the paper upstream of the pressure bar. Figure 5 illustrates the end of the compression of the continuous paper and the pressure cushion 33 is moving out of contact with the pressure bar 24. The continuous paper is compressed, preferably, for about 1 .27 cm from the paper trip continuous on the first winding roller. At a continuous paper speed of 1 5.24 meters per second, the duration of the continuous paper pressure is approximately 0.0016 seconds. Approximately 1.27 cm of elongation or stretching is imparted to the continuous paper between the pressure cushion and the perforation P, which has been split. The core C has been moved by the pressure arm along the stationary plate 27 to a position in which it is compressed by the first winding roll and begins to roll on the stationary plate. A high friction surface on the stationary plate will minimize the slippage of the core and ensure that the core starts rolling as soon as possible. Preferably, the profile of the stationary plate is such that the core will be pressed against the web and the first winding roller immediately after the web is split. In Figure 6, the core C continues rolling on the stationary plate. The glue rings in the core collect the continuous web paper behind the conductive portion 38 of the split web, so that the web begins to wind on the core as the core rolls on the stationary plate. The tail 39 of the continuous paper running under the perforation P continues to wind up in the roll L. In Figure 7, the core has rolled past the stationary plate 27, and the conductive portion 38 of the web is folded back on the outside of the transferred web. The length of the back fold is determined by the position of the perforation P at the moment of transfer of the continuous paper to the core with glue. The core continues rolling on the stationary plate and rolls the continuous paper around it to start a new roll. When the core and the roll in formation reach the second winding roll 21, the roll is wound between the first and second winding rolls, and eventually comes into contact with the master roll 22. A modified pressure arm 42 is illustrated in FIG. Figure 8. A plurality of axially spaced pressure arms extend from a rotatable arrow 43, and a compliant, high friction pressure cushion 44 is mounted on each pressure arm. A core engaging surface 45 on each pressure arm advances a core C onto a stationary plate 46 as the pressure cushion approaches the pressure rod 24. The pressure arms extend through grooves in the core guide 47, and the pressure cushions compress the continuous paper against the stationary pressure bar to tension and split the continuous paper into the perforation. P ^ The split continuous paper is transferred to the core as the core begins to roll on the stationary plate, and the Continuous paper is picked up by the glue in the core. In Figure 9, a new core C is supported in a spring-shaped retainer 50 at the upstream end of the stationary plate 51. A plurality of axially spaced pressure arms 52 are mounted on the arrow 53 and pass through slots in the retainer to push the core onto the stationary plate. The core bends the end of the spring retainer inward as it exits the spring retainer. A pressure cushion 54 in each pressure arm compresses the web against the stationary pressure bar 24 to split the web into the perforation PL The broken web is collected by an axial glue line 55 in the core. Figure 1 0 illustrates a pressure arm 58, which is similar to the pressure arm of Figure 9. However, the spring retainer is omitted, and the core is advanced by the pressure arm along a core guide 50 to a stationary plate 60. A pressure cushion 61 compresses the web against a pressure bar 24, before the core comes into contact with the web in the first winding roller 20.

Using the pressure arm to insert the core between the stationary plate and the first winding roller facilitates the proper timing between the partition of the continuous paper and the contact of the core with the continuous paper, and simplifies the structure of the core insertion device . However, other means for inserting the core can be used. For example, the core can be inserted by a conveyor, an impeller or other equivalent device. Figure 1 1 illustrates a complete winder apparatus 65, which is designed to wind the web in recycled mandrels instead of cores. The mandrels can be either solid or hollow. In one embodiment, tubular steel mandrels were used. Solid plastic mandrels could also be used. After a roll is wound on a mandrel, the mandrel is removed from the roll to provide a coreless roll having a central opening. The extracted mandrel is then recycled for additional winding cycles. U.S. Patent No. 5,421, 536 discloses an apparatus for winding and recycling mandrels. The trimmer 65 includes a frame 66 on which two pairs of drag rollers 67 and 68 are mounted. The feed rollers feed the web W through a perforator 69 to a three-roll winding support formed by a first winding roller 70, a second winding roller 71, and a master roller 72. The perforator 69 includes a rotary perforating roller 75 and a knife bar or anvil 76, to form longitudinally spaced transverse perforation lines in the web.

Referring to Figure 12, the first winding roll includes a dopable, compressible, resilient outer layer 73, which has a relatively high coefficient of friction. The outer layer may be formed from tape, which is wrapped around the roll, or from rubber or polyurethane. The second winding roller 71 has a smooth outer surface, and the master roll 72 has a rough surface with a high coefficient of friction. The first winding roller is rotatably mounted on the frame on a fixed axis. The second winding roller 71 is mounted on a pivot arm 77, and the master roller 72 is mounted on a pivot arm 78. A roll L is being wound on a mandrel Mi. The continuous paper travels from the drag rollers 68 on a pressure bar 80, which is mounted in the frame upstream of the first winding roller 70. The pressure bar has a smooth, low friction surface. If desired, the pressure bar can be positioned so that the continuous paper does not come into contact with the pressure bar during normal winding. A curved stationary plate 82 is mounted below the first winding roller 70 on a bar 83 in the frame. The stationary plate includes an upstream portion 84, in which a cushion 85 (FIGS. 1 3 and 14) and axially spaced handles 86 are mounted, which extend into the notches 87 in the second winding roller. The cushion 85 is formed from compliant, compliant, resilient material, such as soft rubber or soft polyurethane. It may be advantageous if the surface of the cushion 85 has a relatively high coefficient of friction to initiate core rotation. The hands 86 have a smooth surface. A pressure arm 90 is mounted on an arrow 91, which is rotatably mounted on the frame. A pressure cushion 92 is mounted on the pressure arm and extends beyond the end of the pressure arm.

The pressure cushion is formed from high friction, docile, compressible, resilient material, such as rubber or polyurethane. Returning to FIG. 11, top and bottom sprockets 94 and 95 are rotatably mounted on the frame, and a chain 96 is driven by the sprockets. A plurality of carriers of mandrels 98 is mounted on the chain 96 to collect the mandrels M from a mandrel conveyor 99 and to transport the mandrels passing a transfer glue applicator 1 01 to a mandrel insertion position at the upstream end of the plate stationary 82 (Fig. 1 3). Each mandrel carrier includes a pair of pivoting jaws 1 02 and 103 (Fig. 1 3) for holding a mandrel. The glue applicator 101 includes a pivot arm 105 (Fig. 1 2), which is immersed in a bath of transfer adhesive 1 06 and applies an axial line of the transfer adhesive to the mandrel. The adhesive is a relatively low tack adhesive, so that the mandrel can be removed from the wound roll, but the adhesive has sufficient tack to transfer the continuous paper to the mandrel. Referring to Figure 1 3, the mandrel carrier deposits a mandrel with glue M2 at the upstream end of the stationary plate 82, where it is supported by a chuck retainer spring 1 08, which is mounted on the stationary plate . The mandrel does not come into contact with the continuous paper when it is held by the retainer spring. The line of glue on the mandrel is placed at approximately 1 2:00 o'clock in Figure 1 3. When the perforation for the last sheet for the winding roll L is just downstream of the mandrel M2, the rotation of the arrow 91 causes the pressure cushion 92 to compress the web against the stationary pressure bar 80. Although the pressure cushion is moving in the same direction as the continuous paper, the pressure cushion is moving at a lower speed than the continuous paper, preferably at about half the speed of the continuous paper. Consequently, the continuous paper decreases its speed by the pressure cushion. The pressure cushion continues to compress the continuous paper as the pressure arm 90 rotates, and the continuous paper is tensioned and stretched so that it breaks into the desired perforation to form a leading edge 1 10 as shown in Figure 1 3 The rotation of the pressure arm 90 also moves the mandrel M2 past the detent spring 108 (Fig. 14), so that the mandrel comes into contact with the web and starts to roll on the stationary plate 82 under the influence of the first winding roller 70. Although the mandrel is solid, the mandrel can be inserted between the first winding roller and the stationary plate due to the compliant layers 73 and 85. As the mandrel rolls, the line of glue on the mandrel the paper web picks up slightly upstream of the conductive edge, and the web is transferred to the mandrel as shown in Figure 14. As is well known in the art, the speed either of any ao both the second winding roller 71 and the master roll 72 is changed at an appropriate time, so that the winding roll L moves past the lower winding roll 71 and the master roll 72 and below the exit chute 1 1 2. Subsequently, the mandrel is removed from the wound roll by an extractor assembly of mandrels 1 13 (Figure 1 1), and the extracted mandrel is returned by means of a conduit 1 14 to a chuck hopper 15, where the recycled mandrels are picked up by the mandrel carriers 98. Referring again to Figure 14, the mandrel M2, which forms the new roll, continues to roll over the docile cushion 85 and comes into contact with the hands 86. At that time, the Continuous paper is wrapped around the mandrel, provides sufficient performance, so that the hands do not need to be covered with docile material. The second winding roller 71 has already begun to move away from the first winding roll 70 to allow the mandrel and the forming roll to roll through the nibble of the two winder rollers. Figure 1 5 illustrates a complete rewinder apparatus 120, which is designed to wind the web in hollow cores C. The rewinder includes a frame 121, in which two pairs of trailing rollers 1 22 and 1 23 are mounted. trailing rollers advance a continuous paper W beyond a rotating perforating roll 1 24 and a stationary knife bar 125, which forms longitudinally spaced transverse perforation lines in the web. A roll L that is being wound in a hollow core Ci in a three-roll winding support formed by a first winding roll 127, a second winding roll 1 28, and a master roll 129. The first winding roll 1 72 it rotates on a fixed axis, and the second winding roller 1 28 and the master roller 1 29 are mounted as pivots as previously described. The first winding roller and the master roller each have a rough surface with a high coefficient of friction for the continuous paper. The continuous paper travels from the drag rollers 1 23 on a pressure bar 131, which is mounted in the frame upstream of the first winding roller 1 27. The pressure bar has a low, smooth friction surface. A curved stationary plate 1 32 is mounted below the first winding roller 127 and upstream of the second winding roller 128. The stationary plate is formed from lamellated metal and has a smooth surface. For example, the stationary plate can be formed from steel with a finish of 31 7.5 micro centimeters. However, it may be advantageous to provide at least the upstream portion of the stationary plate with a high friction surface for the purpose of initiating core rotation. The cores are delivered to the transfer plate by a core conveyor 135, which is driven on pulleys 1 36 and 1 37.

Referring to Figures 1 6 and 1 7, a core C2 is retained on top of the core conveyor by a pivot arm 1 38. When the arm 1 38 pivots to release the core, the core is carried to the conveyor 1 by a gu 1 39, which rotates with the pulley 1 37. A retainer bar 140 on the conveyor prevents the core from rolling as it is transported in the core conveyor towards the stationary plate. A line of adhesive 141 was previously applied to the core by means of an adhesive applicator. The conveyor 135 deposits the core in an upstream holding portion 143 of the stationary plate 1 32, where it is retained by a core retainer spring 144 (Figure 1 7). Figure 1 7 illustrates a core C3 in the holding position. The core C3 does not come into contact with the web in the holding position. A plurality of axially spaced pressure arms 146 are blanked in an arrow 147, which is rotatably mounted in the frame.

A pressure cushion 148 is mounted on the pressure arm and extends beyond the end of the pressure arm. The pressure cushion is formed of docile, compressible, resilient, high friction material of the same type, which was previously described. When the perforation of the last sheet for the winding roll L is just downstream of the core C3, the rotation of the arrow 147 causes the pressure cushion 148 to prime the continuous paper against the stationary bar 1 31 for tensioning and splitting. the continuous paper in the desired perforation to form a conductive edge 149 (Fig. 1 7). The rotation of the pressure arm 146 also the core C3 beyond the detent spring 144, so that the core comes into contact with the web and begins to roll on the stationary plate 1 32 under the influence of the first winding roller 1 27. The stationary plate 1 32 and the holding portion 143 thereof can be provided with slots to allow axially spaced pressure arms 146 to pass therethrough. As the core rolls on the stationary plate, the line of the glue in the core picks up the web slightly upstream of the conductive edge 149 of the web, the web is transferred to the core, and the leading end portion of the web is folded again on the outside of the gummed portion of the continuous paper portion. As is well known in the art, the core C3, which starts a new roll, can move through the nibble between the first winding roll 1 27 and the second winding roll 1 28 by moving the second winding roll away from the first winding roll and / or changing the speed of the second winding roll relative to the speed of the first winding roll. Figure 1 9 illustrates a trimmer 220, which is similar to the trimmer 1 20 of Figure 15, but which includes a modified core delivery mechanism. The reference numbers for the parts of the rewinder 220, which are similar to the parts of the rewinder 120, will be increased by 1 00. A core conveyor 235 is driven by pulleys 236 and 237.

The conveyor tilts upward and extends beyond normal advancing upper and lower core wheels 251 and 252 (see also Figures 20 and 21). The normal core advance wheels rotate to move a core C axially in a position where the conveyor 235 is adjacent and is supported by a stationary core support 253, which is mounted on the frame 221. The conveyor 235 may be provided by a plurality of axially spaced belts, and the core support 253 may be provided by a plurality of hands, which extend through the spaces between adjacent belts and which are supported by a mounting plate. 254 in the framework of the rewinder. The normal core advance wheels 251 and 252 are driven by pulleys 255 and 256, which are driven by a belt 257, which extends around a conductive pulley 258. As the core moves axially by the normal core advance wheels, a glue applicator 259 is applied an axial strip of glue 259 (FIG. Fig. 20) in the nucleus. After the core is placed in the core supports 253, the core is supported against the supports by pivotable arms 260. The pivotable arms 260 are mounted on a pivot pin 261 and pivoted by a reciprocable ram 262. The arms 260 are mounted between the conveyor belts. A plurality of the core drivers 264 are mounted on each of the conveyor belts 235 for movement with the conveyor belts, and one or more pins 265 are mounted on each of the core drivers.

Referring to Figure 21, as the conveyor belts advance the core pushers 264 upward toward the core C, which is held between the core supports 253 and the pivot arms 260, the pins 265 in the core drives they mesh and pierce the core. The pivot arms 260 are then pivoted to release the core, and the core drivers 262 carry the core upward, towards the core insertion position illustrated in Figure 20, between the stationary plate 232 and the first winding roller 227 When the core reaches the insertion point illustrated in Figure 20, the conveyor belts 235 are stopped, so that the core C is suspended at the insertion point by the pins 265. The pins hold the core in position and orientation correct, so that the glue line 250 is maintained in the proper position to engage the web immediately after the core comes into contact with the web. When it is time for the web to be split, the arrow 247 is rotated to move the pressure arm 246 and the pressure cushion 248 in the position to compress the web against the pressure plate 231. The continued rotation of the pressure arm 246 causes the pressure arm to engage the core C and move the core out of the pins 265 and in the bite between the first winding roll 227 and the stationary plate 232.

The invention can be used to wind a continuous paper in either a hollow paper core, a recycled mandrel, or another type of "core member". The timing of the devices for introducing the cores or mandrels to the stationary plate and the timing and speed of the rotary pressure arms can be controlled accurately in a manner well known in the art by microprocessors and servomotors. The timing of the compression of the continuous paper can be controlled precisely so that the continuous paper is split in the desired perforation to give an exact sheet count of each roll. The duration of the pressure can also be controlled precisely to provide minimal relaxation. Relaxation minimization improves transfer, subsequent folding of continuous paper and decreases wrinkling. In the above embodiments, the relative speed difference between the pressure cushion and the first winding roller stretches the web and causes separation of the web. The high friction pressure cushion compresses the continuous paper against a low friction pressure bar. The speed difference must be large enough for the duration of the compression to exceed the stretch limit of the continuous paper. This will limit the higher speed at which the pressure cushion operates and the insertion of the core in relation to the speed of the continuous flow. The surface velocity of the pressure cushion may be within the range of 10% to 80% of the continuous paper speed.

If the mateirales were inverted, that is, a low friction pressure cushion and a high friction pressure bar, the continuous paper would go at zero speed for the duration of the compression. This is described in U.S. Patent No. 4,723,724. The high friction surface should be a resilient material (such as polyurethane) in a narrow strip, for example, 0.635 centimeters wide in the machine direction. Unlike the patent no. 4,723,724, the duration of the compression could be made very short by the speed of the pressure cushion and the width of the friction strip in the pressure bar. Second, the core or mandrel could be made to come into contact with the web and winding roll immediately after compression, to minimize relaxation at the leading edge. The velocity of the pressure cushion surface could be between 50% and 1 20% of the continuous paper speed. The advantage would be to have the core insertion speed equal to the speed of the web at the point where they first come into contact with the surface of the first winding roller. The core would then fall at a translation speed and collect the rotational speed as it was subjected to the influence of the transfer plate and the first winding roller. The work required to change the movement of the core would come from the friction between the transfer plate and the core., on the opposite side of the core from where the transfer of the continuous paper takes place. This would optimize the transfer condition and would also help reduce any relaxation in the continuous paper due to slippage between the winding roller and the core. Any change in core velocity that will need to be triggered by the first winding roll will be limited by the tension that the continuous paper nibbled between them can tolerate. Any energy added to the core by the winding roller will be achieved by some sliding between them until they equal speed. This could result in rips on the first sheet in the transfer. The terms "low friction" and "high friction" as applied to the pressure cushion, pressure rod, and upper winding roller, are relative terms, but are well understood by those skilled in the art. A quantitative value for friction is not necessary for those skilled in the art, in fact, quantitative values are difficult to measure because of the differences in the continuous roles. What is important is that there is a difference in friction between the pressure cushion and the pressure bar, so that the higher friction surface controls the continuous paper. The high friction surface should have a friction which is twice the friction of the low friction surface. The low friction surface can have a coefficient of friction within the range of about 0.01 to 0.5, and the high friction surface can have a coefficient of friction within the range of about 0.5 to 0.8. While in the above specification a detailed description of specific embodiments of the invention was set forth for the purpose of illustration, it will be understood that many details given herein may be varied considerably by those skilled in the art without departing from spirit and scope. of the invention.

Claims (39)

1. CLAIMING IS 1 . A surface winder for winding a continuous paper in a central member, comprising: a frame, means in the frame for supplying a continuous paper in elongated motion from an upward direction to a downstream direction, a first roller rotatably mounted in the frame, a second roller rotatably mounted on the frame and separated from the first roller, a continuous paper compression surface mounted on the frame adjacent to the first roller and upstream of the first roller, a stationary surface mounted on the current frame below the continuous paper compression surface and separated from the first roller, and a pressure arm movably mounted on the frame and having a portion thereof engageable with the continuous paper compression surface, to compress the paper I continued against the surface of compression.
2. 2. The surface winder of claim 1, including means for inserting a central member between the first roller and the stationary surface and toward contact therewith, so that the rollers of the central member on said stationary surface by the which, the compression of the continuous paper between the pressure arm and the pressing surface, tension and part the continuous paper, and the continuous paper is transferred to the central member as the central member rolls on the stationary surface.
3. 3. The surface winder of claim 2, wherein the means for inserting the central member includes a surface in the pressure arm to move the center member toward the first roller and the stationary surface as it moves from the arm. of pressure.
4. 4. The surface winder of claim 2, wherein the first roll has a uniform outer surface for engaging the continuous paper, which is formed from relatively high friction material to substantially eliminate the slip between the sheet. Continuous paper and the first roller. 5. The surface winder of claim 3, wherein the pressure arm is engageable with the web by compressing the surface upstream of the position in which the center member is inserted between the first roller and the stationary surface. The surface winder of claim 2, wherein the means for inserting a central member is adapted to insert a mandrel between the first roller and the stationary surface, having at least one of the first roller and the stationary surface, a surface that is primitive and resilient. 7. The surface winder of claim 6, wherein both the first rod and the stationary surface have a compressible and resilient surface. 8. The surface winder of claim 7, including stationary hands which extend from the stationary surface toward the grooves in the second rail. The surface winder of claim 8, wherein the stationary surface is formed from relatively high friction material and the hands are formed from relatively low friction material. 1. The surface winder of claim 2, wherein the means for inserting a central member is adapted to insert a hollow core between the first roller and the stationary surface. eleven . The surface winder of claim 1, wherein the portion of the pressure arm, which is engageable with the compression surface of the continuous paper, is compressible and resilient. 12. The surface winder of claim 1, wherein the compression surface of the web is a relatively low friction surface. 1. The surface winder of claim 1 on the compression surface of the web is a relatively low friction surface. 14. The surface winder of claim 1, in which the compression surface of the continuous paper is a relatively high friction surface.
5. 5. The surface winder of claim 14, wherein the portion of the press arm, which is engageable with the compression surface of the web, is a relatively low friction surface. The surface winder of claim 1, wherein the first roller has a uniform outer surface for engaging the continuous paper, which is formed from a relatively high friction material to substantially impede the slipping between the paper continues and the first roll. 7. The surface winder of claim 1, wherein the compression surface of the continuous paper is stationary. 8. The surface winder of claim 1, including speed control means for moving the pressure bar at a lower speed than the first roller. 9. The surface winder of claim 1, wherein the pressure arm is rotatably mounted on the frame to rotate in a direction which is opposite to the direction of rotation of the first rod, the arm being flexible. of pressure at a lower surface velocity than the first roller, when the pressure arm compresses the web against the compression surface of the web. 20. A bobbin winder for winding a continuous paper perforated in a central member, comprising: a frame, means in the frame for supplying a continuous paper in elongated movement having a plurality of uniformly spaced transverse perforations, the paper continuing to move from an upstream direction to a downstream direction, a first roller rotatably mounted in the frame and having a high friction surface, which is engageable with the continuous paper to substantially impede the slipping between the continuous paper and the first roller, a second roller rotatably mounted on the frame and separated from the first roller, a stationary pressure bar mounted on the frame adjacent to the first roller and upstream of the first roller, a stationary surface mounted on the adjacent frame in the second wheel and upstream of the second wheel, the supe stationary surface of the first roller by a gap, which is smaller than the diameter of the central member, a pressure arm rotatably mounted on the frame and having a portion thereof engageable with a portion of the pressure bar for compressing the continuous paper between the pressure arm and the pressure bar, and means for inserting a central member between the first roller and the stationary surface, whereby the compression of the continuous paper between the pressure arm and the compression surface , tension and part the continuous paper and the continuous paper is transferred to the central member as it rolls on the stationary surface. twenty-one . The surface winder of claim 20, wherein the pressure arm is rotatably mounted on the frame to rotate in a direction, which is opposite to the direction of rotation of the first roller, the pressure arm being rotatable to A lower speed than the first roller when the pressure arm compresses the continuous paper against the continuous paper compression surface. 22. The surface winder of claim 20, wherein the means for inserting the central member includes a surface in the pressure arm to move the central member toward the first roll and the stationary surface in accordance with the pressure arm. tour 23. The surface winder of claim 20, wherein the pressure arm portion, which is engageable with the continuous paper compression surface, is compressible and resilient. 24. The surface winder of claim 20, in which the first roller has a uniform outer surface for engaging the continuous paper, which is formed from a relatively high friction material to substantially eliminate the sliding between the continuous paper and the first roller. 25. The surface winder of claim 20, wherein the means for inserting a central member is adapted to insert a solid mandrel between the first roller and the stationary surface, having at least one of the first roller and the surface stationary, a surface that is primitive and resilient. 26. The surface winder of claim 20, wherein the means for inserting a central member is adapted to insert a hollow core between the first roller and the stationary surface. 27. A method for winding a continuous paper in a central member comprising the steps of: providing a first and a second rotatable rollers separated, providing a compressing surface adjacent to the first roller, feeding a continuous paper from a direction upstream to a downstream direction beyond the compression surface and in contact with the first roller, providing a stationary surface spaced apart from the first roller, compressing the continuous paper against the compression surface to tension and split the continuous paper, and introduce a central member between the first roller and the stationary surface whereby the central member rolls on the stationary surface and the continuous paper is transferred to the central member. The method of claim 27, wherein the web is compressed against the compression surface upstream of the position, in which the central member is inserted between the first roller and the stationary surface. 29. The method of claim 27, including the step of providing the first roller with an outer surface of relatively high friction material. 30. The method of claim 29, including the step of perforating the continuous paper along transverse lines, which are separated in the direction of travel of the continuous paper, the distance between the position in which the continuous paper is compressed against the compression surface and the position in which the central member is inserted between the first roller and the stationary surface, is less than the gap between adjacent perforations and the continuous paper is split in the first perforation, which is current below said position in which the central member is introduced. 31 The method of claim 27, wherein the web is compressed against the pressurized surface by a rotary pressure arm. 32. The method of claim 31, wherein the surface velocity of the pressure arm is less than the surface velocity of the first roller. 33. The method of claim 31, wherein the step of introducing a central member between the first roller and the stationary surface is performed by rotating the pressure arm against the central member. 34. The method of claim 31, wherein the web is divided between the position in which the web is compressed and the surface of the first web. 35. A core delivery device for a trimmer that comprises: a frame, a conveyor movably mounted on the frame, a core driver mounted on the conveyor for movement with the same, a pin on the driver core adapted to pierce a core, and means for delivering a core to the conveyor, whereby the pin can pierce the core and the core imputer can move the core with the conveyor. 36. The apparatus of claim 35, including means for supporting a core adjacent to the conveyor until the core driver engages the core. 37. The apparatus of claim 36, wherein the means for supporting a core includes a pivotally mounted arm in the frame. 38. The apparatus of claim 36, wherein the means for supporting a core includes a stationary core support mounted on the frame. 39. The apparatus of claim 35, including means for removing a core from the pin.