Reel feeding method and device

Abstract: A method and device for feeding reels (3) from a store (8), in which the reels (3) are aligned along a first axis (4) coaxial with the reels (3), to an unwinding unit (6) having a platform (11) rotating about a second axis (7), and at least one unwinding pin (13) movable with the platform (11) between a work position (15) and an unwinding position (14); the unwinding pin (13) is movable, with respect to the platform (11), between the work position (15) and a loading position (18) in which the unwinding pin (13) is aligned with the first axis (4); and each reel (3) is fed onto the unwinding pin (13) in the loading position (18) by moving the reel along the first axis (4).

Description: The present invention relates to a reel feeding method. More specifically, the present invention relates to a method of feeding reels of packing material from a store to an unwinding unit of a user machine. The device according to the present invention may be used to advantage on automatic packing or manufacturing machines, to which the following description refers purely by way of example. Packing machines are known to feature reel feeding devices for successively transferring reels from a store to an unwinding unit by means of a transfer device having an arm fitted with gripping members for picking up and retaining a reel. To transfer the reels, the arm is moved cyclically from a pickup station at the store to a supply station at the unwinding unit. In particular, US-4441662 describes a device for feeding reels from a store, along which the reels are fed parallel to their respective axes and in a supply direction to an unwinding unit. The device features a guide extending in a conveying direction crosswise to the supply direction of the store, and which supports a slide traveling along the guide in the conveying direction. The slide supports an arm, which rotates with respect to the slide about an axis of rotation parallel to the conveying direction, and is fitted with gripping members for gripping a reel. The cyclic movement, between the pickup and supply stations, of the arm fitted with the gripping members comprises longitudinal movements in the conveying direction, and transverse movements in a direction crosswise to the conveying direction. The transverse movements are performed by rotating the arm as described, while the longitudinal movements are performed by the slide moving as described along the guide. The feeding devices described in the above patent is mechanically complex, by a moving part - the slide - supporting a further part - the arm - in turn movable with respect to the slide, as well as the respective actuating means. And the situation is further complicated by the arm also supporting moving parts - the gripping members - and the respective actuating means. EP-0618161 discloses a device for automatically changing reels for feeding webs of wrapping material, especially for cigarette packaging machines, which comprises: a magazine for a row of coaxial full replacement reels, with means for successively feeding said reels to a collecting station; an unwinding mandrel whose axis is parallel with the axis of the row of reels, on which mandrel it is possible removably to lock an unwinding reel; a transfer mandrel parallel with the unwinding mandrel, on which it is possible removably to lock a full replacement reel and which is mounted on a transfer arm, by which the full replacement reel is moved from the collecting station to a station for joining the head end of its web of wrapping material to the tail end of the web of the finished unwinding reel and then from the joining station to the unwinding station, where the replacement reel is passed to the unwinding mandrel. US-4744711 discloses an apparatus for automatically transferring successive fresh bobbins from a magazine wherein the bobbins are stacked in horizontal planes to one of two reciprocable horizontal spindles which are carried by a pivotable holder has annular tongs with claws which are movable into engagement with the periphery of the topmost bobbin in the magazine, and a crank drive which changes the orientation of tongs during transport between the magazine and an unoccupied spindle so that a fresh bobbin which is engaged by the claws in the magazine is moved from its horizontal plane into a vertical plane and its core can receive the unoccupied spindle. All the aforementioned feeding devices are mechanically complex and do not allow a quick and easy transfer of the bobbins to the mandrels. It is an object of the present invention to provide a reel feeding method involving none of the aforementioned drawbacks and which, in particular, is straightforward and cheap to implement. According to the present invention, there is provided a method of feeding reels as recited in Claim 1. The present invention also relates to a reel feeding device. According to the present invention, there is provided a reel feeding device as recited in Claim 9. A number of non-limiting embodiments of the present invention will be described by way of example with reference to the accompanying drawings, in which: Figure 1 shows a schematic front view of a preferred embodiment of the device according to the present invention; Figure 2 shows a side view of the Figure 1 device; Figure 3 shows a schematic front view of a further embodiment of the device according to the present invention; Figure 4 shows a side view of the Figure 3 device. Figure 2 shows a side view of the Figure 1 device; Number 1 in Figures 1 and 2 indicates as a whole an automatic packing machine employing strip packing material 2, typically paper or similar, unwound off reels 3, each having a longitudinal axis 4. Machine 1 comprises a device 5 for feeding reels 3, and in turn comprising an unwinding unit' 6 having a substantially horizontal central axis 7 perpendicular to the Figure 1 plane, and a known store 8 supporting a number of reels 3, which are transferred successively to unwinding unit 6. In store 8, reels 3 are aligned, with respective axes 4 coaxial with one another; and store 8 comprises an actuating device 9 for moving reels 3 along store 8 in a supply direction 10 parallel to axis 7 and to axes 4. Unwinding unit 6 comprises a known circular platform 11 connected to a drive unit 12 to rotate in steps, with respect to drive unit 12, about axis 7, and having a surface 11a facing the output end of store 8, and a surface 11b on the opposite side to surface 11a. Platform 11 comprises two unwinding pins 13, each of which is normally parallel to axis 7, projects outwards of surface 11b of platform 11, and has known lock members (not shown) for retaining a respective reel 3. Unwinding pins 13 are movable, together with platform 11, between an unwinding position 14 and a work position 15 in which one unwinding pin 13 projects from surface 11b and is coaxial with longitudinal axes 4 of reels 3 in store 8. To move from unwinding position 14 to work position 15 and vice versa, each unwinding pin 13 is rotated, together with platform 11, through 180° about axis 7 by drive unit 12. Each unwinding pin 13 is fitted to platform 11 by means of a respective known actuating device 16 enabling unwinding pin 13 to rotate, with respect to platform 11, about an axis 17 crosswise to axis 7. When an unwinding pin 13 is in work position 15, axis 17 is horizontal and perpendicular to longitudinal axes 4 of reels 3 in store 8. Each unwinding pin 13 is movable, with respect to platform 11, between work position 15 and a loading position 18 (shown by the dash line in Figure 2) in which unwinding pin 13 is coaxial with axes 4 and projects outwards from surface 11a to face reels 3 in store 8. To move from work position 15 to loading position 18 and vice versa, each unwinding pin 13 is rotated, with respect to platform 11, through 180° about axis 17. Operation of feeding device 5 will now be described as of the instant in which one free unwinding pin 13 is set to work position 15, while the other unwinding pin 13 is set to unwinding position 14 and supports a running-off reel 3. The respective actuating device 16 is operated to move the free unwinding pin 13 from work position 15 to loading position 18 by rotating the pin through 180° about axis 17. At this point, as stated, the free unwinding pin 13 is coaxial with and facing reels 3 in store 8; and actuating device 9 is operated to feed the first reel 3 in supply direction 10 and onto the free unwinding pin 13. The known lock members (not shown) of unwinding pin 13 are then operated to retain the first reel 3, and actuating device 9 is operated to back up the other reels 3 in store 8 in supply direction 10, so that the first reel 3 loaded onto unwinding pin 13 is detached from the other reels 3 in store 8, and may be rotated about axis 17, together with respective unwinding pin 13, without interfering with the other reels 3 in store 8. Actuating device 16 is then operated to move unwinding pin 13 and first reel 3 from loading position 18 to work position 15 by rotating the pin through 180° about axis 17. Finally, as the reel 3 in unwinding position 14 on platform 11 runs out, drive unit 12 is operated to move the unwinding pin 13 with the new first reel 3 from work position 15 to unwinding position 14, and simultaneously move the other, by now empty, unwinding pin 13 from unwinding position 14 to work position 15. The above operations are repeated cyclically. In a different embodiment shown in Figures 3 and 4, the axis of rotation 17 of each unwinding pin 13 is vertical (as opposed to horizontal, as in Figures 1 and 2) when the unwinding pin 13 is in work position 15. In yet a further embodiment (not shown), store 8 comprises an actuating device capable of feeding one reel 3 at a time in supply direction 10 along the end portion of store 8 at unwinding unit 6, so that the first reel 3 is already detached from the other reels 3, which therefore need no longer be backed up once the first reel 3 is loaded onto the unwinding pin 13 in loading position 18. In yet a further embodiment (not shown), supply direction 10 is not parallel to central axis 7. For example, supply direction 10 may be inclined with respect to the horizontal, in which case, axis of rotation 17 is not perpendicular to supply direction 10 when unwinding pin 13 is in work position 15. Alternatively, supply direction 10 may be parallel to the axis 19 shown in Figure 4.

Claims: A method of feeding reels to an unwinding unit (6) comprising a support (11) and at least one unwinding pin (13) fitted to said support (11); the method comprising a loading step for loading a reel (3) onto said unwinding pin (13), and being characterized by said loading step comprising the steps of moving the unwinding pin (13) with respect to the support (11) to move the unwinding pin (13) from a work position (15) to a loading position (18); feeding a said reel (3) to load the reel (3) onto the unwinding pin (13) in the loading position (18); and moving the unwinding pin (13) carrying the reel (3) with respect to the support (11) to restore the unwinding pin (13) to said work position (15). A method as claimed in Claim 1, wherein the reel (3) is fed from a store (8), in which a group of reels (3) are aligned with one another along a first axis (4) coaxial with the reels (3), to the unwinding unit (6) facing an output end of said store (8); and method comprising the steps of moving the unwinding pin (13) with respect to the support (11) to move the unwinding pin (13) from the work position (15) to the loading position (18) in which the unwinding pin (13) is coaxial with the first axis (4) and facing the store (8); feeding said reel (3) along the first axis (4) to load the reel (3) onto the unwinding pin (13) in the loading position (18); and moving the unwinding pin (13) with respect to the support (11) to restore the unwinding pin (13) to said work position (15). A method as claimed in Claim 2, wherein said support (11) is a rotary support rotating about a second axis (7); the method comprising a moving step in which said support (11) is moved to move said unwinding pin (13) between said work position (15) and an unwinding position (14). A method as claimed in Claim 2 or 3, wherein said unwinding pin (13) is moved, with respect to said support (11), between said work and loading positions (15, 18) by being rotated about a third axis (17) perpendicular to said first axis (4). A method as claimed in Claim 4, wherein the unwinding pin (13) is rotated about said third axis (17) by a maximum of 180°. A method as claimed in Claim 5, wherein the unwinding pin (13) is rotated 180° about said third axis (17). A method as claimed in any one of Claims 3 to 6, wherein said first axis (4) is parallel to said second axis (7). A reel feeding device comprising an unwinding unit (6) having a support (11) and at least one unwinding pin (13) fitted to said support (11); the device comprising first actuating means (9) for loading a reel (3) onto said unwinding pin (13), and being characterized in that said unwinding unit (6) comprises second actuating means (16) for moving the unwinding pin (13), with respect to the support (11), between a work position (15) and a loading position (18); the first actuating means (9) being designed for feeding the reel (3) to load the reel (3) onto the unwinding pin (13) in the loading position (18): and the second actuating means (16) being also designed for moving the unwinding pin (13) carrying the reel (3) with respect to the support (11) to restore the unwinding pin (13) to said work position (15). A reel feeding device as claimed in Claim 8, further comprising a store (8) for supporting a number of reels (3) aligned with one another along a first axis (4) coaxial with the reels (3); first actuating means (9) being designed for moving said reels (3) along the first axis (4), the support (11) facing an output end of the store (8), and the second actuating means (16) being designed for moving the unwinding pin (13), with respect to the support (11), between the work position (15) and the loading position (18), in which the unwinding pin (13) is coaxial with said first axis (4) and faces said store (8). A device as claimed in Claim 9, wherein said support (11) is a rotary support rotating about a second axis (7); and third actuating means (12) are provided to move the unwinding pin (13), together with the rotary support (11), between said work position (15) and an unwinding position (14). A device as claimed in Claim 9 or 10, wherein said unwinding pin (13) is fitted to said support (11) so as to rotate about a third axis (17), which is perpendicular to said first axis (4) when said unwinding pin (13) is in said work position (15). A device as claimed in Claim 10 or 11, wherein said first axis (4) is parallel to said second axis (7). A device as claimed in any one of Claims 9 to 12, wherein said first actuating means (9) are reversible actuating means.

Inventors: SPATAFORA MARIO, SPATAFORA, MARIO
Applicants: GD SPA, G.D SOCIETA' PER AZIONI
Application year: 1999
Main classification: B65H19
IPC codes: B65H19