RE-REELING MACHINE WORKING AT CONSTANT SPEED AND RELATED CUTTING DEVICE

Abstract: The object of the invention is a re-reeling machine comprising a conveyor roller (11), suitable for being partially wound with a sheet material (40), a movable winding roller (13), able to be positioned by means of the rotation of a control cam (18), suitable for supporting the reel (30' and 30'' respectively) in the winding and discharge phase, and a transfer roller (23), exerting elastic pressure on the reel, suitable for bringing the reel into contact with the winding roller (13), in which re-reeling machine the replacement core (30) encounters the sheet material before reaching the axis of conjunction between the transfer roller (23) and the conveyor roller (11), and the rollers always rotate at constant speed, the conveyor roller (11) and the winding roller (13) rotating at the same peripheral speed, while the transfer roller (23) rotates at a slightly lower peripheral speed.

Description: "RE-REELING MACHINE WORKING AT CONSTANT SPEED AND RELATED CUTTING DEVICE" The present invention concerns a re-reeling device for sheet materials, particularly paper, and the related cutting device. To eliminate accidental defects or imperfections in the confection of reels of sheet material, for example paper, the practice is known 5. of repeating the winding operation on machines analogous to reeling machines, but generally of smaller dimensions, called re-reeling machines. At presen , re-reeling machines are used in which the reel being wound has no support chucks. 10. Re-reeling machines of this type usually comprise an upper cylinder, with a peripheral speed equal to the feeding speed of the material, and a lower cylinder, spaced from the first in such a way that a winding core for the reel to be made up can be positioned between the said two cylinders. During the winding phase, the second 15. cylinder is operated with a peripheral speed equal to that of the first cylinder, while, in the reel replacement phase, the speed of the said second cylinder is reduced to allow the expulsion operations of the made up reel and the introduction of a new core. This slowing down, and in some cases even stopping, of the cylinder, 20. results in imperfection in the first winding layers of the reel to be made up, and relatively low production. The aim of the invention is to realize a re-reeling machine which allows high production by guaranteeing perfect winding of the reel right from the first layers. The above aim has been achieved with equipment comprising a conveyor roller, suitable for being partially wound with the sheet material, a movable winding roller, suitable for supporting the reel in the 5. winding and discharge phase, and a transfer roller, exerting an elastic pressure on the reel, suitable for bringing the reel into contact with the winding roller, in which equipment the replacement core encounters the sheet material before (about 13 mm before) reaching the axis of conjunction between the transfer roller and the 10. conveyor roller, and the rollers always rotate at constant speed, the conveyor roller and the winding roller rotating at the same peripheral speed, while the transfer roller rotates at a slightly lower peripheral speed (about 1'1%). In the re-reeling machine according to the invention, the winding 15. roller is preferably moved, by means of a leverage, by a control cam, whose profile defines the length of winding of the reel. The cam profile preferably has a substantially arc of circumference portion completed by a curved line, having a minimum zone and a maximum zone- When the member driven by the cam travels along the 20. zone descending between the arc portion and the minimum zone, the winding roller supports the wound reel, aligning with it, and a new core is introduced between the conveyor roller and the transfer roller. When the driven member reaches the minimum zone, the winding roller is in a lower position, which allows the 25. discharge of the made up reel, while the centre of the new reel, already in the winding phase, is positioned along the axis of conjunction between the conveyor roller and the transfer roller. When the driven member reaches the maximum zone, the winding roller is in an upper position, in which it receives the reel in the winding phase, while the reel already made up leaves the winding unit. Finally, during the arc of circumference path of the driven 5. member, the winding of the reel is completed between the three winding, conveyor and transfer rollers. In a different embodiment, the leverage can be controlled by means of a microprocessor. The re-reeling machine according to the invention comprises 10. insertion arms whose ends are provided with rollers or pins, and are arranged adjacent to the core which is to be introduced, until the latter reaches the axis of conjunction between the conveyor roller and the transfer roller. An elastic means can be foreseen, for example a spring, a pneumatic 15. cylinder or a cam, in order to allow the transfer roller to move away from the conveyor roller, and thus from the reel being made up, so as to avoid the wound material being crushed. The re-reeling machine according to the invention preferably comprises a cutting device, consisting of a rotating cylinder 20. provided with a retractable blade suitable for engaging with a recess provided on the conveyor cylinder, the emerging of the said blade being operated in such a way that the blade comes into contact with the conveyor cylinder at the end of winding. The re-reeling machine conforming to the invention provides the PCI7IT89/00066 04561 - 4 - advantage of perfect winding, guaranteed by the continuing constant speed of the rollers and by the absence of stress on the material from any origin. The invention will now be explained more clearly with reference to 5. the enclosed drawings, in which: figure 1 shows a diagrammatic view of a part of a re-reeling' machine; figure 2 shows the winding unit of the re-reeling machine in figure 1 in a first working phase; figure 3 shows the winding unit in figure 2 in a second working 10. phase; figure 4 shows the winding unit in figure 2 in a third working phase; figure 5 shows the winding unit in figure 2 in a fourth working phase. 15. In figure 1, a re-reeling machine is shown comprising a feeding device 28, suitable for conveying the cores 30 towards a glueing machine 24, capable of spreading certain areas of the cores 30 with adhesive as they advance towards a conveyor 34, by which the cores 30 reach a winding unit. The winding unit comprises a conveyor 20. roller 11, partially wound with sheet material 4Q, for example paper, which reaches the said roller T1 after crossing- . a roller and counter roller unit, of which only roller 10 can be seen in the drawing. The conveyor roller 11 has an area provided with vacuum chambers 12, suitable for facilitating the engagement between the 25. material 40 and the cylinder 11 at the moment the material 40 is cut, and a recess 35. A roller 8 is positioned adjacent to the conveyor roller 11, above the area involved by the cores arriving, provided with a retractable cutting blade 9. Below the area affected by the cores as they arrive, on the other hand, a transfer roller 23 is provided, which is affected by a movable supporting means, which allows it to shift elastically in the direction of the straight line of conjunction between its centre and the centre of the conveyor 5. roller 11 (as shown with a dotted line in figure 1). A series of arms 22 is provided at the side of the transfer roller 23, having end pins 37 suitable for accompanying the cores 30 as they enter. On the other side, the transfer roller 23 is alongside a winding roller 13, supported in a movable way by means of a leverage 36, one 10. of whose ends supports the winding roller 13, while the opposite end has a member 15 driven by a control cam 18. The profile of the control cam 18 has a substantially arc of circumference portion, completed by a curved line with a minimum zone 18a and a maximum zone 18b. The leverage 36 comprises a manoeuvre steering wheel 15. suitable for regulating the distance between the winding roller 13 and the conveyor roller 11, independently of the cam 18. In the re-reeling machine described, the cores 30, come from a storage container not seen in the drawing, being lifted by means of the feeding device 28 up to the conveyor 34, from which they are 20. guided between the transfer roller 23 and the conveyor roller 11. When the cores 30 reach the glueing machine 24, they are spread with adhesive in a determined area so that the first layer of material can adhere to them. The new core 30' comes into contact with the winding material 40 in the space between the transfer roller 23 and 25. the conveyor roller 11 , about 13 mm before it reaches the axis of conjunction between the said rollers (as shown in figure 2) . At the beginning of winding, the core 30' is supported by the transfer roller 23, while the end pins 37 of the arms 22 are adjacent to - 6 - it. At the same time, the reel 30" already wound is once more in the space between the conveyor roller 11 and the winding roller 13, in alignment with the latter. In this phase, the member 15 driven by the cam 18 travels along the section on the cam profile descending 5. between the arc of circumference and the minimum zone 18a. When the driven member 15 reaches the minimum zone 18a (figure 3) , the winding roller 13 is in a lower position, in which it allows the reel 30" already wound to be discharged, while the reel which is being formed 30" is still supported by the transfer roller 23, which 10. has moved elastically further away from the conveyor roller 11, so as not to crush the wound material. When the driven member 15 reaches the maximum zone 18b (figure 4) , the winding roller 13 reaches an upper position, in which it receives the reel 30' being wound. In this phase, the end pins 37 15. of the arms 22 no longer affect the reel being made up. When the driven member 15 travels along the arc of circumference portion of the cam 18 (figure 4), the reel 30' continues to be wound, which is between the three conveyor 11, transfer 23 and winding 13 rollers. 20. in the re-reeling machine described, all the rollers rotate at constant speed in the rotation direction shown by the arrows, without reducing their speed even during replacement of the made up roller with the new core. The conveyor rolle 11 and the winding roller 13 rotate at the same peripheral speed, while the transfer 25. roller 23 rotates at a slightly lower peripheral speed (for example of about 1 % . As each revolution of the cam 18 is completed, which corresponds to one complete winding of the reel, the emerging of the retractable blade 9 of the roller 8 is operated in such a way that it can engage 5. with the recess 35 of the conveyor roller 11 , separating the sheet material and so preparing a new end of winding material. Obviously the rotation of the roller 11 is in phase with the rotation of the roller 8, so that the recess 35 meets the blade 9 when the reel reaches the predetermined winding diameter. 10. The steering wheel 27, by means of which the winding roller 13 can be moved away from or near to the conveyor roller 11, is provided to guarantee that the winding roller 13 carries out its function without crushing the made up reel 30' , for any predetermined size of reel.

Claims: AMENDED CLAIMS [received by the International Bureau on 14 March 1990 (14.03.90) original claim amended ; other claims unchanged (1 page)] 1. A re-reeling machine comprising a plurality of rollers (10) suitable for making a sheet material (40) advance at a constant speed, a conveyor roller (11) on which said sheet material (40) is partially wound, a movable reeling roller (13) to allow the diameter of a reel (30', 30") made from said sheet material (40) to enlarge, and a transfer roller (23) which co-operates with the other two rollers (11, 13) during the winding of the reel (30', 30"), as well as means (22, 37) co-operating to insert in succession cores (30) in the space between the three rollers (11, 13, 23) which always rotate at a constant speed, characterized in that the conveyor roller (11) and the winding roller (13) substantially rotate at the same peripheral speed, which is the advancing speed of the sheet material (40) , while the transfer roller (23) rotates at a slightly lower peripheral speed, said roller (23) being placed upstream of the winding roller (13) and leaving the conveyor roller (11) to allow the entry of the core (30) , which meets the sheet material (40) before reaching the axis of conjunction between the conveyor roller (11) and the transfer roller (23) . 2. A re-reeling machine according to claim 1 , characterized in that the replacement core (30') encounters the sheet material (40) about 13 mm before reaching the axis of conjunction between the transfer roller (23) and the conveyor roller (11). 3. A re-reeling machine according to claim 1 or 2, characterized in that the transfer roller (23) rotates at a

Inventors: CONSANI ALBERTO, CONSANI, ALBERTO
Applicants: CONSANI ALBERTO SPA
Application year: 1989
Main classification: B65H19
IPC codes: B65H19