Apparatus for automatically stacking differently sized panels or packs of panels

Abstract: Apparatus for automatically stacking differently sized packs of panels (P), or may be differently sized panels, formed by a dividing apparatus, on respective lifting platforms, in such a logic mode that packs of panels (P) of a same size will be stacked on one and the same lifting platform. The rows (H) of packs of panels (P) moved out of a cutting machine in the dividing apparatus, are shifted in a parallel direction to the final cutting line (Z) in the dividing apparatus. The said rows (H) consisting of a plurality of successive packs of panels (P) having a same length but an even differentiated width, are fed to at least one transport runway (12) arranged at right angles thereto. The single packs of panels (P), or the single panels, composing a panel row (H), are then individually transferred to the said transport runway (12) by suitable means (13, 113) so as to be mutually set in line thereon in the same way. When the packs of panels (P), or the panels, are already disposed in this way, they are simply translated onto the said runway (12), while in the contrary case they are turned, or turned over 90° around a vertical axis and simultaneously translated, so that these packs of panels will be properly disposed and laid on the transport runway (12). Lifting platforms (T) are provided at one side of the transport runway (12) for packs of panels (P), or may be panels, to be transferred thereto and stacked thereon.

Description: The invention relates to an apparatus for automatically stacking different sized panels or packs of panels - formed by a dividing apparatus from a large board or a pack of large boards - on respective lifting platforms provided at one side of a transport runway for panels or packs of panels, each lifting platform receiving panels or packs of panels of a same size, and in which the final cutting line of the dividing apparatus is arranged at right angle to the transport runway and a table is located downstream of this cutting line for gathering and recomposing thereon the large board or the pack of large boards (R) divided in a plurality of successive rows of panels or packs of panels, each row being parallel to the said cutting line and composed by a plurality of single panels or packs of panels which have the same width in the direction at right angle to the said cutting line but may have different lenghts in the direction parallel to the said cutting line, panel turning and translating means being provided for individually orienting each panel or stack of panels with its longer side in the longitudinal direction of the transport runway and for transferring it onto the transport runway. An apparatus of this kind according to the preamble of claim 1 is known from the document EP-A-0422600. It is an object of the invention to provide an improved stacking apparatus of the kind above described, which is more easily constructed and affords a higher operative speed with a greater reliability from the technical standpoint. According to the invention there is provided a stacking apparatus of the type described, characterized in that a) a comb-like pusher member with selectively operatable teeth is provided for translating the successive rows of panels or packs of panels one after another in a direction parallel to the cutting line up to a transfer station disposed sideways of the transport runway, b) a panel turning and translating gripper device is provided on that side of the transfer station which is turned inthe transport direction of the transport runway, c) the panel turning and translating gripper device consists of a frame which carries two or more selectively operatable, vertically movable, spaced apart gripper members and is mounted on guide means on which it is horizontally movable by actuating means so as: to assume a rest position, in which the gripper members are disposed laterally in the transfer station and constitute a side guide for the panels or packs of panels which are already oriented with their longer sides parallel to the longitudinal direction of the transport runway and are transferred by the comb-like pusher member without rotation onto the transport runway, to be translated from the rest position transversely to the transport runway and towards the same, simultaneously gripping a panel or a stack of panels which is already oriented with its longer sides parallel to the longitudinal direction of the transport runway, for transferring this panel or stack of panels without rotation onto the transport runway, or to be translated from the rest position transversely and longitudinally to the transport runway and to be at the same time turned over 90° around a vertical axis, simultaneously gripping a panel or stack of panels which is oriented with its longer sides transversely to the longitudinal direction of the transport runway, for rotating this panel or stack of panels with its longer sides parallel to the longitudinal direction of the transport runway and transferring it onto the transport runway, d) the guide means of the panel turning and translating gripper device are mounted on supporting means movable in a horizontal plane for adjusting purposes, and e) the transporting runway is either of the motor-driven roller type with a panel-lifting comb-like platform having its teeth arranged between the rollers forming the transport runway or of the type consisting of sliding panels with retractable pusher members and/or gripping members. Some advantageous improvements of the invention are described in the dependent claims. Some preferred embodiments of the invention will be described hereinafter merely by way of non-limiting examples with reference to the annexed drawings, in which: Figures 1 and 2 are plan views respectively showing a simple and a complex embodiment of the stacking apparatus. Figures 3, 4, and 5 are top plan views respectively showing possible operative modes of the device for feeding packs of panels to the transport runway interlocked with the lifting platforms on which packs of panels of a same size are respectively stacked. Figure 6 is a side view showing a station for stacking packs of panels, provided in the apparatus according to Figure 1. Figures 7, 8, 9, 10, and 11 are side views showing the sequence of the various operative steps in one of the stations for stacking packs of panels, provided in the apparatus according to Figure 2. Figures 12, 13, and 14 are top plan views showing further possible operative modes of the device for feeding packs of panels to the transport runway interlocked with the lifting platforms for stacking respective packs of panels of a same size. Figure 15 is a sectional view showing some details taken on line XV-XV in Figure 12. Figures 16 and 17 are side views of a panel-stacking station in the stacking apparatus shown in Figure 2, which is operated as shown in Figures 12, 13, and 14. Figure 18 is a diagrammatic top plan view of the device for feeding packs of panels to the transport runway interlocked with the lifting platforms for stacking respective packs of panels of a same size. Figure 19 is a plan view of a possible embodiment of the mechanism for driving the device shown in Figure 18. Figure 20 is a sectional view showing some details taken on line XX-XX in Figure 19. Figures 21, 22, 23 are plan views respectively showing a modified embodiment of the mechanism according to Figure 18. Figure 24 is a front view of the mechanism shown in Figure 23. Figure 25 is a plan view showing a further modified embodiment of the mechanism according to Figure 18. Figure 26 is a front elevational view of the mechanism shown in Figure 25. In Figure 1, reference letter Z denotes the final cutting line of a complex dividing apparatus. Rows H of packs of panels P, and possibly of panels, are cyclically moved out of the said cutting line, which normally is for transverse cuts to be made in the packs of panels, or may be in the panels. The packs of panels P have in each row a same width dimension at right angles with the cutting line Z, and have an even differentiated length dimension which is parallel to the cutting line Z. The packs of panels P forming each row H, shall be automatically stacked on respective lifting platforms T, usually in such a logic mode that equally sized packs of panels P will be stacked on each lifting platform. Downstream of the cutting line Z a suitable table 1 is provided for supporting thereon the side-by-side rows H of packs of panels P cut from a pack of large boards R. The packs of panels P forming each row, may be square or rectangular in shape and, in this latter instance, they may be disposed with their long sides directed parallel or perpendicular to the cutting line Z. A panel stopping and aligning bar member 2 arranged parallel to the cutting line Z, is provided at the one end side of table 1. A blade-like member 3 which can be driven into a motion of translation in either direction of the double arrow F3, and which can be lowered and lifted, is provided for recomposing against the panel-stopping and aligning bar member 2, a pack of large boards R which by the dividing apparatus has been cut into packs of panels P, according to a cutting pattern that is usually called "logic". At one side of table 1 a straight bar member 4 is provided in perpendicular relationship with the cutting line Z, for guiding the rows H of packs of panels P while these rows are being arranged on table 1. The bar member 4 can be driven into a motion of translation in either direction of the double arrow F4, and can be lowered and lifted, just like the blade-like member 3. In order to improve the operation of the considered stacking apparatus, the possibility is contemplated of having rows H of packs of panels P transferred beyond the panel stopping and aligning bar member 2, just as it occurs in other stacking apparatus of known type. In this instance, the said bar member 2 can be lifted and lowered and, may be, translated so as to be caused to take over the blade-like member 3 in handling the material, i.e., the rows H of packs of panels P moved out of the cutting line Z. Thus, the packs of panels P in these rows H are stacked in the desired arrangement on a unit diagrammatically designated by the reference numeral 5, comprising, for example, a lifting platform with a horizontally extending cover member on the top side thereof, which may be in form of a wedge or a steel strip, as disclosed in former Patents in the name of the same Patentee. Once the required number of rows H of packs of panels P has been arranged on table 1, but normally at the time when the rows H of packs of panels P cut from a pack of large boards R inserted into the dividing apparatus, have been recomposed on table 1, the panel guiding and transferring bar member 4 is operated so as to be caused to transfer as a whole the rows H of packs of panels P obtained from the said pack of large boards R, onto a parking table 6 arranged at one side of table 1. This parking table 6 has its outward side provided with a composite panel stopping and aligning barrier device formed by at least one immovable member 7' and by one or more movable members 7, which are connected to means for guiding and shifting these latter members in either direction of the double arrow F7. At one end side of the parking table 6, a panel-aligning stationary bar member 8 is provided in-line with the panel-stopping and aligning bar member 2, and at the opposite end side of the parking table 6 a blade-like member 9 is provided in parallel relation with the bar member 8, and is operated by guiding and motivating means, whereby the blade-like member 9 will be translated in either direction of the double arrow F9. The rows H of packs of panels P will be as a whole correctly laid and arranged on the parking table 6 by the members 4, 7, 7', 8, 9, the panel guiding and transferring bar member 4 being then returned into starting position. On that side of table 6 which is opposite to the side thereof engaged by the members 7, 7' of the composite panel stopping and aligning barrier device, a panel-translating comb-like member 10 with its teeth being selectively lowerable and liftable, is arranged parallel to the said members 7, 7'. As the panel guiding and transferring bar member 4 is transferring the rows H of packs of panels P onto the parking table 6, all of the teeth of the comb-like member 10 are set in their down position, so that they are prevented from interfering with the being-transferred packs of panels. The comb-like member 10 has a reduced length, for example about one-half or one-third of the length of the long sides of the parking table 6, and has one side located at a short distance from the panel-aligning bar member 8. This comb-like member 10 is connected to means for guiding and motivating it in either direction of the double arrow F10. While the rows H of packs of panels P cyclically moved out of the cutting line Z, are being laid and recomposed on table 1, the leading row H of packs of panels P which is set in contact with the panel-aligning bar member 8, is evacuated by the comb-like member 10 from the parking table 6, perpendicularly to the sides of said table 6. The teeth of the comb-like member 10 are set in such a raised position as to affect only the leading row H of packs of panels P to be evacuated from the parking table 6. At the same time, the movable members 7 of the panel stopping and aligning barrier device, lying opposite to the comb-like member 10, are positioned as close as possible to the row H to be evacuated, however without being allowed to interfere therewith. Once the leading row H has been evacuated from the parking table 6, the panel-translating blade-like member 9 is automatically operated for the whole rows H of packs of panels P laid on the parking table 6, to be translated until the now-leading row H is caused to contact the panel-aligning bar member 8. The row H of packs of panels P which has been evacuated from the parking table 6, is moved to a station 11, for example against a stationary abutment means Q1. In station 11 means are provided for the packs of panels P forming the evacuated panel row H, to be transferred normally by turns onto the transport runway 12, as it will be disclosed later. This runway 12 is for feeding the stacking platforms T in such a logic mode that when the packs of panels P are disposed with their short sides in the direction F10 in which they are shifted, these packs will be transferred onto the transport runway 12 without their arrangement being changed. However, when the packs of panels P are disposed with their long sides in the direction F10 in which they are shifted, these packs shall be turned over 90° around a vertical axis, previously to being transferred onto the transport runway 12. Thus, the packs of panels will be always disposed on the runway 12 with their long sides in the direction in which they are conveyed. Provided at the end section of station 11 is a gripper device 13 which in rest position is in-line with an extension of the panel-aligning bar member 8. The gripper device 13 is provided with two or more sequentially arranged gripper members 25, 125, which are adapted for being selectively set in operative condition so as to be usually caused to clamp only the pack of panels P bearing against the stationary abutment means Q1, but no successive pack of panels. The gripper member or members 25, 125 of the gripper device 13, when set in operative condition, will firmly clamp a pack of panels P by the outward side thereof. Thereafter, when the gripper device 13 is operated, as it will be disclosed later, the inoperative gripper members are moved along with the operative gripper members, without adversely interfering with the packs of panels P at standstill in station 11. The gripper device 13 may be operated in two different modes when a pack of panels to be transferred onto the transport runway 12, is already properly disposed with the long sides thereof directed parallel to the said runway 12. In the one mode, the gripper device 13 may be held at rest, with its gripper members 25, 125 in open condition, as shown in Figure 3, so that the gripper device 13 is caused to perform the function of prolonging the panel guiding and aligning action of the bar member 8, and a properly disposed pack of panels P can be then transferred onto the transport runway 12 by the panel-translating comb-like member 10. In this instance, it may be contemplated that when a number of successive rows H of packs of panels P, laid on the parking table 6, consist of packs of panels already disposed in the proper way for being moved onto the transport runway 12, more than one row H may be simultaneously acted upon by the panel-translating comb-like member 10, whereby a plurality of properly disposed packs of panels will be simultaneously transferred onto the transport runway 12, and laid thereon in a sequential arrangement. Otherwise, according to the other mode shown in Figure 4, the gripper device 13 may be caused to take hold with one or more of its gripper members 25, 125, of a properly disposed pack of panels P bearing against the stationary abutment means Q1, and may be then driven into such a rectilinear motion that this pack of panels will be translated and transferred onto the transport runway 12. It is obvious that the gripper device 13 is now caused to sequentially act only on the properly disposed packs of panels P in one panel row H. However, when a pack of panels P, bearing against the stationary abutment means Q1, is disposed with its long sides at right angles with the transport runway 12, as shown in Figure 5, the gripper device 13 is caused to grip the pack of panels P by its gripper members 25, 125, and is then driven into a composite motion of rotation and translation, whereby this pack of panels P is turned over 90° around a vertical axis and translated onto the transport runway 12, and the gripper device 13 comes to be positioned on that side of the runway 12 which is turned toward the station 11, and is consecutive thereto. In this position of the gripper device 13, the gripper members 25, 125 thereof are set in open condition, and the gripper device 13 is then moved in the reverse direction and returned into its starting position, ready for a new panel turning and translating cycle to be repeated. When in station 11 a plurality of sequentially arranged packs of panels P are awaiting to be moved onto the transport runway 12, and the leading pack of panels has been transferred onto this runway 12, the next-following packs of panels P are pushed forward by the comb-like member 10, so that the each-time leading pack of panels is caused to bear against the stationary abutment means Q1, to be then acted upon as required by the gripper device 13. The transport runway 12 may be of the motor-driven roller type. In this instance, provisions may be made for the packs of panels P to be transferred from the station 11 to the transport runway 12 by means of a not shown panel-lifting comb-like platform having its teeth arranged between the rollers forming the transport runway 12, and which is generally designated by reference numeral 15. When the panel-lifting comb-like platform 15 is set in its uplifted position, this platform receives a pack of panels P moved out of station 11, thus preventing any interference of this pack with the rollers forming the transport runway 12, and deposits the received pack of panels onto this runway 12. The panel-lifting comb-like platform 15 may be caused to cooperate with packs of panels P in a rolling or sliding friction mode, for example by means of small wheels or belts. Otherwise, the transport runway 12 may be of the type consisting of sliding planes, or of freely rotatable rollers or wheels. In these instances, the packs of panels P are moved forward on the transport runway 12 by retractable pusher members and/or by gripper members. All this is conceivable and easily practicable by those skilled in the art, so that it is not shown in the accompanying drawings. It is obvious that when gripper members are used, the packs of panels P can be driven forward at a higher speed than with motor-driven rollers, but it is however ensured that the packs of panels will be maintained in the proper arrangement. In Figure 6 there is shown that when a pack of panels P conveyed on the transport runway 12, has been moved up to a predetermined lifting platform T, in-line therewith, this pack P is stopped and is translated onto this platform T by a pusher member 14, subsequently to having been lifted by a sliding or rolling friction panel-lifting comb-like platform 15. In Figure 2 there is shown a modified embodiment of the panel stacking apparatus, wherein a second parking table 106 is provided, which is like the parking table 6 as disclosed by referring to Figure 1, and is located downstream of table 1. The auxiliary panel-stacking unit 5 provided with the wedge-like cover member or with a cover member of an equivalent type, which is like the panel-stacking unit 5 in the embodiment according to Figure 1, may be now located down-stream of the parking table 106. The correct recomposition on the parking table 106 of a pack of large boards R cut into packs of panels P, is achieved by means of a motor-driven blade-like member 103, which is like the above-disclosed blade-like member 3. Reference numeral 110 denotes the panel-translating comb-like member which is interlocked with the parking table 106, and reference numerals 107, 107' denote the members of a panel-stopping and aligning barrier device which is also interlocked with the said parking table 106. Unlike the parking table 6, the parking table 106 is controlled by guiding and motivating means, whereby from a position in which the parking table 106 is coplanar to the table 1, this parking table 106 will be moved upon control into an uplifted position, by an amount that is suitably greater than the thickness of the packs of panels P coming out of the dividing apparatus. The parking table 106 lies in a coplanar relation with the table 1 during the stage in which a pack of large boards R, suitably cut into packs of panels P, is being transferred from the table 1 onto the parking table 106. The parking table 106 is thereafter lifted by the predetermined suitable amount and is positioned in a coplanar relation with the station or panel-stacking unit 5, and with a station 111 which is arranged at one side of the parking table 106, and is provided at its downstream end with a gripper device 113 for turning, or for turning and simultaneously translating packs of panels, in a like manner as disclosed for the units 11 and 13 shown in Figure 1, and as provided also in the stacking apparatus being now discussed. A row H of packs of panels P may be moved into, and handled in station 111 either by the comb-like member 110 alone, or in conjunction with an auxiliary comb-like member 210. In this latter instance, the comb-like member 110 is driven into a predetermined stroke, as required for the row H of packs of panels P to be transferred from the parking table 106 to the station 111, where this panel row is taken over by the comb-like member 210, which is imparted such a logic motion as required for causing the packs of panels P in the said panel row H to bear by turns against the stationary abutment means Q2. Located downstream of station 111 is the transport runway 112, onto which single packs of panels P coming from the station 111 are cyclically transferred, with the long sides thereof being disposed in the panel conveyance direction, as previously stated. The transport runway 112 is arranged in an adjoining, parallel relation with the transport runway 12 having lifting platforms T located near to the outward side thereof. As shown in Figure 7, between the two transport runways 12, 112, a comb-like shelf member 16 is provided in close proximity of each lifting platform T, over the runway 12 and in bridge-like fashion between the runway 112 and the respective lifting platform T. The said comb-like shelf member 16 has a wedge-like lateral profile tapering toward the respective lifting platform T, and is pivotally connected at 17 to an underlying lever arm 18, so as to extend parallel to the said transport runways 12, 112, the said lever arm 18 being in turn connected to an actuator 19, such as a fluid pressure-operated piston-and-cylinder unit. When the shelf member 16 is positioned as shown in Figure 7, the upward face thereof is coplanar to the transport runway 112, so that the packs of panels P1 being conveyed on the transport runway 12, are allowed to freely pass with no interference under the shelf member 16. Two packs of panels P1, P2 which by the transport runways 12, 112 have been suitably conveyed at one and the same lifting platform T, can be simultaneously transferred onto this platform and stacked thereon in superimposed relation. According to the operative sequence shown from Figures 7 and 8, a pack P2 of panels is transferred by a pusher member 20 from the transport runway 112 to the comb-like shelf member 16, and is placed above the pack P1 of panels, laid on the transport runway 12. Then, as shown in Figure 9, the pusher member 20 is returned into rest position, and a comb-like pusher member 21 is positioned at the rear end side of both packs P1 and P2. The comb-like pusher member 21 is located over the comb-like shelf member 16, and is initially lifted up therefrom, so that it is prevented from hindering the transfer of pack P2 from the runway 112 to the shelf member 16. The teeth of the comb-like pusher member 21 are inserted between the teeth of the comb-like shelf member 16, and the said pusher member 21 is thereafter translated as shown in Figure 10, whereby both packs P1, P2 will be simultaneously transferred onto the relative lifting platorm T. During such a transferring step, the actuator 19 is neutralized, in order that the packs P1, P2 moved out of the shelf member 16, may be superimposed and stacked in their superimposed condition onto the relative lifting platform T. In Figure 11 there is shown that on completion of the pusher member translating step, the pusher member 21 is returned into its uplifted position, whereupon it is set again in its cycle-starting position, as shown in Figure 7. In Figures 12, 13, and 14 there is shown a modified embodiment in which the stationary abutment means Q1, Q2 are not provided at that side of the respective transport runway 12, 112 which is turned toward the station 11, 111, for packs of panels P to be individually fed to the runway 12, 112, but are provided at the opposite, outward side thereof. These stationary abutment means located at the outward side of the transport runway 12, 112, may each consist of an abutment member or a panel-clamping member 22, 122, against which is caused to bear the leading pack of panels P in a panel row H being pushed forward respectively by the comb-like member 10, and by the comb-like member 110 alone, or in conjuction with the auxiliary comb-like member 210. The gripper device 13, 113 is mounted on an associated table 23, 123 which is motor-driven, and is so guided as to be moved on a horizontal plane, transversely to the respective transport runway 12, 112, whereby the gripper device 13, 113 will be positioned in such a manner as to allow only the leading pack of panels P, into abutment with the abutment member 22, 122, and already disposed in the proper way for its conveyance on the transport runway 12, 112, to be freely translated and conveyed thereon, as shown in Figure 12. Otherwise, when a pack of panels P needs to be turned over 90°, as shown in Figure 13, this pack is clamped at one of its long sides by the gripper members 25, 125 of the gripper device 13 or 113 either before having been caused to contact the abutment member 22 or 122, or after that such a contact has occurred. In this latter instance, the abutment member in form of a panel-clamping member 22 or 122, will be suitably shifted so as to be prevented from interfering with the pack of panels P in the course of being turned. While this pack of panels P is being turned, the table 23 or 123 carrying the associated gripper device 13 or 113 is moved, when required, transversely to the transport runway 12 or 112 so that the long side of this pack, which is opposite to the long side thereof clamped by the gripper members 25, 125 of the gripper device 13 or 113, is caused to bear against the stationary abutment means Q1 or Q2, for example against the panel-clamping abutment member 22 or 122, having been restored in its operating condition. Finally, as shown in Figure 14, when the packs of panels P to be turned are of a small size, two or more of these packs at a time may be clamped by the gripper device 13 or 113 and turned over 90° while being simultaneously translated. In Figure 15 there is shown that in the modified embodiment according to Figures 12, 13, 14, the packs of panels P are moved forward on the transport runway 12 or 112 by means of panel-clamping members 22 or 122 which are set in operation along the stationary abutment means Q1, or Q2, and are withdrawn when a pack of panels is being transferred onto a lifting platform T, so as to be prevented from interfering with the being-transferred pack of panels P. Figures 16 and 17 are views of the stacking apparatus according to Figure 2, however modified as shown in Figures 12, 13, 14. In this modified embodiment, sidewise arranged panel-clamping members 22, 122 are used for the packs P1 and P2 of panels to be moved forward on the transport runway 12, 112. While the packs P2, P1 of panels are being transferred respectively from the transport runway 112 to a shelf member 16, and from the transport runway 12, to the relative lifting platform T, these packs may be supported just by the panel-lifting comb-like platforms generally designated by reference numeral 15 in Figures 6 and 15, which are translated for closing the gaps left clear by the panel-clamping members 22, 122. All this is conceivable by a person skilled in the art, even though it is not shown in Figures 16 and 17. Such a technical problem does not arise when the packs of panels are moved forward on the transport runways 12, 112 by withdrawable panel-clamping members being caused to advance in-between the freely rotatable wheels or fixed shoes forming the said runways, since in this instance the whole arrangement may be similar to the embodiment shown in Figures 7 to 11. In planning the stacking apparatus according to the invention, the most important technical problem that the designer engineer had to face was the construction of the gripper device 13, 113 for turning over 90° around a vertical axis, mutually in-line packs of panels P positioned at one side of the transport runway 12, 112 for feeding the lifting platforms T, in that the gripper device 13, 113 must be such as to fundamentally meet the following requirements: The gripper device 13, 113 must be capable to act even on differently sized packs of panels; Normally, the leading, and not the next-following, pack of panels P is the sole that the gripper device 13, 113 shall turn, but in certain cases the gripper device must be capable to simultaneously turn two or more sequentially arranged packs of panels of a small size; The leading pack of panels P, while being turned by the gripper device 13, 113, must not interfere with the successive pack of panels; The leading pack of panels P in the course of being turned, should be preferably removed at the same time from the panel-withdrawal station 11 or 111, so as to have this station restored in its working condition as quickly as possible; When the leading pack of panels P has been, or is being turned by the gripper device 13 or 113, the successive pack of panels must be allowed to advance so as to be caused to bear against the abutment means Q1 or Q2; Once the leading pack of panels P has been turned, the gripper device 13, 113 must be moved backward without any interference with the just turned pack of panels or with the next-following pack of panels bearing against the reference abutment means Q1 or Q2. In Figure 18 there is shown that the gripper device 13, 113 comprises a respective frame 24, 124 located in the room at the interior of the curve as described by a pack of panels in the course of being transferred from the station 11 to the transport runway 12, and carrying two or more gripper members 25, 125 facing one side of a row of packs of panels P to be turned. The gripper members 25, 125 are preferably fixedly mounted to the associated frame 24, 124 in such a manner that these gripper members are not movable relative to the said frame, but are movable into their open position and into their closed or clamping position. The gripper members 25, 125 are open toward the packs of panels P moved into the station 11, 111, which may be of a same or a different size. Thus, the gripper member 125 which is the nearer to the stationary abutment means Q1 or Q2 when the gripper device 13 or 113 is at rest, may be larger than the other gripper member 25 carried thereby, this in order to allow the gripper member 125, that in certain cases shall act alone, to firmly clamp a pack of panels to be turned. The gripper members 25, 125 are made according to the known art, such as diagrammatically shown in Figure 20. These gripper members 25, 125 are formed with a lower jaw 26 which is located slightly under the table whereon packs of panels P are supported and shifted, so that this lower jaw 26 will not interfere with these packs, and are formed with an upper jaw 27 which is suitably spaced apart from the lower jaw 26, and can be lowered by an actuator 28. Each gripper member 25, 125 is restrained to the frame 24, 124 in such a manner that when the upper jaw 27 is caused to contact a pack of panels, the concerned gripper member 25, 125 is imparted such an upward movement that its lower jaw 26 is set in contact with, and is caused to clamp this pack. Guide means, not shown, arranged in the space between the gripper members 25, 125, and performing the same function as the panel-aligning bar member 8, 108, may be provided on the frame 24, 124 for preventing any undesired movement of the packs of panels P while being caused to travel from the one to the other gripper member 25, 125, owing to the pushing action of the comb-like member 10, or 110, or 210. In the foregoing disclosure of the stacking apparatus, there is pointed out that according to one possible operative mode, the gripper device 13, 113 must be capable to handle the packs of panels P so as to have the same translated or turned, according to whether these packs are, or are not, properly disposed for being transferred onto the transport runway 12 or 112. Therefore, the gripper device 13, 113 can be motivated as shown in Figure 19. The frame 24, 124 is provided at the ends thereof with wheel means 30, 130 running in a rail 31 having a T-shape in plan view. With the gripper device 13, 113 in rest condition, the wheels 30, 130 engage the end stretch 131 of rail 31, and the wheel 130 is situated at the intersection of said rail stretch 131 with the rail stretch 231 extending perpendicularly thereto, as shown by solid lines in Figure 19. Between the rail stretch 131 and the rail stretch 231 at right angles therewith, a curved rail 32 is provided which can be tangentially connected to the said rail stretches 131, 231 by means of switches 33 and 34 controlled by suitable actuators, not shown. Arranged parallel to the stretches 231 and 331 of rail 31 are the sections of a chain 35 led over three vertical axis pinions 36 and driven by any suitable motor unit rotating in both directions. As shown in Figure 20, the chain 35 is connected through a link 37 to one end of the frame 24, 124, for example to an extension of the axle of wheel 30. When a pack of panels P clamped by the relative gripper member or members 25, 125 is to be translated by the gripper device 13, 113, the chain 35 is driven in the direction indicated by the arrow 38 in Figure 19, so that the wheels 30, 130 on the frame 24, 124 are moved onto the stretch 331 of rail 31. At this stage, provisions may be made for the rail stretch 231 to be barred at the wheel 130 by a lock 39, prior to the chain 35 having been operated. When a clamped pack of panels P is to be turned or, rather, it is to be turned and simultaneously translated by the gripper device 13 or 113 according to the operative sequence shown in Figure 18, the rail stretches 131, 331 are barred by a lock 41, the switch 33 is operated as shown by dash lines, and the chain 35 is driven in the direction of arrow 40. The wheel 130 runs on the rail stretch 231, and the wheel 30 runs on the curved rail 32 up to the switch 34, thus operating this switch, and comes to be positioned on the rail stretch 231. With the reverse movement, when the wheel 30 is drawn away from the switch 34, this switch is returned into rest position by the load of spring means, so that the wheel 130 is allowed to run on the rail stretch 231, and to return into rest position. In Figure 18 there clearly appears that in this first possible operative mode of the gripper device 13, 113 the movements of the gripper members 25, 125 fully answer to the above-stated requirements, in that The leading pack of panels P is turned and is moved away from the next-following pack of panels, so that it will not interfere with this latter pack; When the gripper member 125 is not in its closed or clamping condition, the same is moved away from the pack P of panels immediately following the leading pack of panels clamped by the gripper member 25 and being turned, so that the gripper member 125 will not interfere with the next-following pack P which remains at standstill; When the turning of a pack of panels P has been completed by the gripper device 13, 113, the packs of panels in station 11 can be moved forward so as to be caused to bear in turn against the reference abutment means Q1 or Q2, without having to wait for the backward movement of the gripper device 13, 113, which occurs without the gripper members 25, 125 interfering with the packs of panels P laid in station 11; Once a pack of panels has been turned, the gripper device 13, 113 can be immediately moved backward to the station 11, without the gripper members 25, 125 interfering with the just turned pack that has been transferred onto the transport runway 12 or 112; While a pack of panels P is being turned, it is longitudinally and transversely moved away from the station 11, which turns to advantage for the working rate of the gripper device 13, 113. The operative sequence shown in Figure 18, is determined by a substantially centered position of the wheels 30, 130 relative to the gripper members 25, 125. If the gripper members 25, 125 are held at the interior of the path of said wheels 30, 130, the gripper members will be moved in an improved manner away from the packs of panels which are kept at dwell in station 11, and from the pack of panels having been transferred onto the transport runway 12 or 112. It was observed that during the operation of the stacking apparatus, the gripper device 13, 113 should be preferably caused to perform such a motion of translation as to have its gripper members properly adapted onto a pack of panels P laid in the station 11, 111, or as to have this pack of panels properly positioned while it is being turned over 90°. In this instance, the gripper device 13, 113 is provided only for turning the packs of panels. As stated by referring to Figure 12, the gripper device 13, 113 is mounted on a table 23, 123 which is operated by means being adapted for moving the said device 13, 113 on a horizontal plane, perpendicularly to the longitudinal direction of the transport runway 12 or 112. As shown in Figure 21, the wheels 130, 30 on the frame 24, 124 carrying the gripper members 25, 125 of the gripper device 13, 113, can be guided respectively by a straight rail 231 and by a curved rail 32 tangentially merging into the former rail by means of the switch 34 provided with a return spring, as already disclosed in connection with the embodiment according to Figure 19. In this instance, the gripper device 13, 113 is operated by an actuator imparting the same a rectilinear alternate motion, such as a fluid-pressure operated cylinder-and-piston unit, not shown, which is connected to the extension of the axle of wheel 130. The embodiment according to Figure 22 differs from the embodiment shown in Figure 21 in that the switch 34 has been eliminated. The wheels 30, 130 on frame 24, 124 are not arranged in-line with each other like in the embodiment shown in Figure 21, so that the rail 32 does not merge into the rail 231. In Figures 23 and 24 there is shown a further simplified construction of the embodiment according to Figure 21. The frame 24, 124 that carries the gripper members 25, 125 of the gripper device 13, 113 is connected at one end through a vertical articulated joint 42 to an assembly of straight slides and guides 43 arranged parallel to the longitudinal axis of the transport runway 12, with these slides being connected to an actuator 44 imparting them a rectilinear alternate motion. Through a vertical articulated joint 45, the other end of frame 24, 124 is articulated to a lever arm 46 which is swingably connected to a vertical shaft 47 that is ideally situated at the center of curvature of the rail 32 shown in Figure 21. In the embodiment according to Figures 23 and 24, the use of rails and switches as in Figures 21 and 22, is avoided. The guides in the assembly 43 and the shaft 47 are both carried by the table 23, 123 by which the required motion of translation is imparted to the gripper device 13, 113. Figures 25 and 26 show another modified embodiment derived from the preceding Figures. According to this modified embodiment, the ends of the frame 24, 124 are each connected through a vertical articulated joint 42, 45 to a respective assembly of rectilinear slides and guides 43, 48, the said assemblies being arranged orthogonally to each other, on horizontal planes lying the one above the other. The guide or guides in the assembly 43 are parallel to the longitudinal axis of the transport runway 12, 112, and the guide or guides in the assembly 48 are parallel to the longitudinal axis of station 11, 111. These guides are supported by the table 23, 123 by which the required motion of translation is imparted to the gripper device 13, 113. The slides in the assemblies 43 and 48 are here driven by respective actuators, such as of the fluid pressure-operated type. The whole arrangement is such as to be conceivable and easily practicable by those skilled in the art.

Claims: An apparatus for automatically stacking different sized panels or packs of panels (P) - formed by a dividing apparatus from a large board or a pack of large boards (R) - on respective lifting platforms (T) provided at one side of a transport runway (12, 112) for panels or packs of panels (P), each lifting platform (T) receiving panels or packs of panels (P) of a same size, and in which the final cutting line (Z) of the dividing apparatus is arranged at right angle to the trasport runway (12, 112) and a table (1, 6, 106) is located downstream of this cutting line (Z) for gathering and recomposing thereon the large board or the pack of large boards (R) divided in a plurality of successive rows (H) of panels or packs of panels (P), each row (H) being parallel to the said cutting line (Z) and composed by a plurality of single panels or packs of panels (P) which have the same width in the direction at right angle to the said cutting line (Z) but may have different lenghts in the direction parallel to the said cutting line (Z), panel turning and translating means being provided for individually orienting each panel or stack of panels (P) with its longer side in the longitudinal direction of the transport runway (12, 112) and for transferring it onto the transport runway (12, 112), characterized in that a) a comb-like pusher member (10, 110) with selectively operatable teeth is provided for translating the successive rows (H) of panels or packs of panels one after another in a direction parallel to the cutting line (Z) up to a transfer station (11, 111) disposed sideways of the transport runway (12, 112), b) a panel turning and translating gripper device (13, 113) is provided on that side of the transfer station (11, 111) which is turned in the transport direction of the transport runway (12, 112), c) the panel turning and translating gripper device (13, 113) consists of a frame (24, 124) which carries two or more selectively operatable, vertically movable spaced apart gripper members (25, 125) and is mounted on guide means (31, 43, 48), on which it is horizontally movable by actuating means (35, 36, 44) so as: to assume a rest position, in which the gripper members (25, 125) are disposed laterally in the transfer station (11, 111) and constitute a side guide for the panels or packs of panels (P) which are already oriented with their longer sides parallel to the longitudinal direction of the transport runway (12, 112) and are transferred by the comb-like pusher member (10, 110) without rotation onto the transport runway (12, 112), to be translated from the rest position transversely to the transport runway (12, 112) and towards the same, simultaneously gripping a panel or a stack of panels (P) which is already oriented with its longer sides parallel to the longitudinal direction of the transport runway (12, 112), for transferring this panel or stack of panels (P) without rotation onto the transport runway (12, 112), or to be translated from the rest position transversely and longitudinally to the transport runway (12, 112) and to be at the same time turned over 90° around a vertical axis, simultaneously gripping a panel or stack of panels (P) which is oriented with its longer sides transversely to the longitudinal direction of the transport runway (12, 112), for rotating this panel or stack of panels (P) with its longer sides parallel to the longitudinal direction of the transport runway (12, 112) and transferring it onto the transport runway (12, 112), d) the guide means (31, 43, 48) of the panel turning and translating gripper device (13, 113) are mounted on supporting means (23, 123) movable in a horizontal plane for adjusting purposes, and e) the transporting runway (12, 112) is either of the motor-driven roller type with a panel-lifting comb-like platform having its teeth arranged between the rollers forming the transport runway or of the type consisting of sliding panels with retractable pusher members and/or gripping members. The stacking apparatus according to claim 1, characterized in that between a receiving table (1) arranged directly downstream of the final cutting line (Z) of the dividing apparatus, for gathering and recomposing thereon the large board or the pack of large boards (R) divided in a plurality of successive rows (H) of panels or packs of panels (P), and the transfer station (11) provided sideways of the transport runway (12)and associated with the panel turning and translating gripper device (13), a first parking table (6) is interposed, means (4) being provided for transferring the divided and recomposed large board or pack of large boards (R) in a direction parallel to the cutting line (Z) from the receiving table (1) onto the first parking table (6) associated with the comb-like pusher member (10), which is provided at the end of the first parking table (6) opposite to the final cutting line (Z), this firs parking table (6) being further associated with panel aligning means (7, 7', 8) provided on its side adjacent the comb-like pusher member (10), and with a panel translating blade-like member (9) movable parallel to the longitudinal direction of the transport runway (12) towards the end of the first parking table (6) associated with the comb-like pusher member (10). The stacking apparatus according to claim 2, characterized by comprising: a) a second parking table (106) arranged inline with, and downstream of the receiving table (1), b) means (3) for transferring the divided and recomposed large board or pack of large boards (R) in a direction at right angle to the cutting line (Z) from the receiving table (1) onto the second parking table (106), c) a second transport runway (112) associated with the second parking table (106) and disposed parallel to the first transport runway (12) on its side opposite to the lifting platforms (T), this second transport runway (112) being located at a higher level than the first transport runway (12) between the latter and the second parking table (106), d) means for causing the second parking table (106) to be lifted to the level of the second runway (112) once a divided and recomposed large board or pack of large boards (R) has been transferred from the receiving table (1) onto the second parking table (106) in a position of the second parking table (106) coplanar to the receiving table (1), e) a second comb-like pusher member (110) with selectively operatable teeth, associated with the second parking table (106) at its end opposite to the receiving table (1), f) panel aligning means (107, 107', 108) provided on the side of the second parking table (106) turned towards the second transport runway (112) and on the side adjacent the second comb-like pusher member (110), g) a panel translating blade-like member(109) associated with the second parking table (106) and movable parallel to the longitudinal direction of the second transport runway (112) towards the end of the second parking table (106) associated with the comb-like pusher member (110), h) a second transfer station (111) disposed sideways of the second transport runway (112) between this runway (112) and the second parking table (106) and associated with a second panel turning and translating gripper device (113), i) a shelf member (16) associated with each lifting platform (T) and extending like a bridge from the second transport runway (112) over the first transport runway (12) up to the associated lifting platform (T), in such a manner that panels or packs of panels (P) can be transferred from the second transport runway (112) to the lifting platform (T) by passing on the respective shelf member (16), and these shelf members (16) do not hinder the progress of single panels or packs of panels (P) on the underlying first transport runway (12) and the transfer of these panels or packs of panels (P) from the first transport runway (12) to the lifting platforms (T). The stacking apparatus according to claim 3, characterized in that the shelf members (16) are comb-like shaped and have a wedge-like lateral profile, with their tapered end pointing to the respective lifting platform (T), and with their flaring end being pivotally connected (at 17) to a support member (18), in such a manner as to extend parallel to the longitudinal axis of the upper second transport runway (112), the said comb-like shelf members (16) being controlled by a servo control (19), and a pusher member (20) being provided for transferring a panel or a pack of panels (P) from the second transport runway (112) to the shelf member (16) which is coplanar thereto, and a comb-like pusher member (21) is subsequently operated so as to be caused to pass through the gaps in the said comb-like shelf member (16), and to act both upon the upper and the lower panel or pack of panels (P), so that these two panels or packs of panels will be simultaneously transferred onto the relative lifting platform (T), the shelf member (16) being caused in timed relation to freely swing downward, which allows the two transferred panels or packs of panels to be stacked the one upon the other on one and the same lifting platform (T). The stacking apparatus according to the preceding claims, characterized in that a stacking unit (5) of known type, such as of the wedge type, is provided in-line with the receiving table (1), immediately downstream of this table (1) or downstream of the second parking table (106), onto which stacking unit (5) rows of panels or packs of panels may be transferred and stacked just as they come out of the dividing apparatus. The stacking apparatus according to any one of the preceding claims, characterized in that guide means are proveided on the frame (24, 124) carrying the gripper members (25, 125) of the panel turning and translating gripper device (13, 113), for the panels forming a pack of panels (P) to be kept into mutual alignment when these panels are moved relative to the gripper members (25, 125) in open condition. The stacking apparatus according to any one of the preceding claims, characterized by the provision of means for causing the panelsor the packs of panels composing a row (H), when properly disposed for being transferred onto the transport runway (12, 112), to bear by turns against a stationary reference abutment means (Q1, Q2) located at the opposite side of the transport runway (12, 112), and to be individually transferred thereon by the panel turning and translating gripper device (13, 113). The stacking apparatus according to any one of the preceding claims, characterized by the provision of means for causing the panels or packs of panels (P) composing a row (H), when properly disposed for being transferred onto the transport runway (12, 112), to bear by turns against a stationary abutment means (22, 122) which is so located that the leading panel or pack of panels (P) in the row (H) will be already laid at this stage on the transport runway (12, 112), to be subsequently operated for conveying the leading panel or pack of panels (P) away from the successive panels or packs of panels (P) held back by the panel turning and translating gripper device (13, 113) positioned at one side of the successive panels or packs of panels, and which is susceptible of being longitudinally moved and caused to cyclically let free the each-time leading panel or pack of panels (P) to be conveyed onto the transport runway (12, 112). The stacking apparatus according to any one of the preceding claims, in which means are provided for causing two or more small-sized panels or packs (P) of panels to be simultaneously acted upon by the panel turning and translating gripper device (13, 113). The stacking apparatus according to any one of the preceding claims, characterized in that the frame (24, 124) carrying the gripper members (25, 125) of the gripper device (13, 113) is connected by its fore end to means whereby this frame is moved horizontally over a first rectilinear path which is parallel to the longitudinal axis of the transport runway (12, 112) and the said frame (24, 124) is connected by its rear end to means whereby it is moved horizontally over a second rectilinear path which is perpendicular to the said first rectilinear path, or over a curved path connected with the said first and second straight paths, these rectilinear paths being obtained by means of guide and slide assemblies, and the curved path being obtained by means of a carriage and wheel motivation or by means of swingable arms.

Inventors: BENUZZI PIERGIORGIO, BENUZZI, PIERGIORGIO
Applicants: GIBEN IMPIANTI SPA, GIBEN IMPIANTI S.P.A.
Application year: 1992
Main classification: B26D7
IPC codes: B26D7, B21D43, B27B31