FI118044B - Hardware for placing sheet-like objects in pink - Google Patents

Description

118044

Hardware for placing sheet-like objects in pink

The present invention relates to apparatus for arranging sheet-like objects into a pink. In particular, the apparatus is intended for the pinking of veneer sheets cut from a wooden owl.

Wood-cut veneer is treated as single sheets at various stages of the board making process, in particular at the plywood manufacturing plant. The sheets may be integral pieces cut to size, or alternatively, a particular sheet size may be composed of a plurality of side-by-side narrower sheets formed by a veneer cutter as a result of a flaw cut. From these sheets, it is necessary to make storage benches where the sheets are waiting for the next processing step, first and foremost to form the plate nucleus.

It is known to use suction conveyors to assemble pink. These conveyors consist of a box-like structure, the veneers of which are rolled on the underside of the conveyor and are transported to the top of the bench. The conveyor drawer maintains a vacuum that acts on and supports the veneer that is in contact with the lower surface through slots on or below the bottom surface. In order to provide transportation, conveyor belts are placed along the crevices, between which spaces or through which vacuum has been imitated the possibility of affecting the supporting veneer. The slot or slots are located in the direction of transport * ϊ.

• '1' and extended to the intended transport distance. The gap can be replaced by a matching * ·, ··· φ line of holes.

• ·. The veneers are removed at the shoulder to be formed using the included presser mills ··· la · · ··· φ · *. suction-dependent transport station. Pushers are usually boxed • «· * ·. ·· *. The horizontal surface of the • · • · · stack, which extends downwardly from the underside of the structure, extends beyond the veneers. Also known as • · • · ·. solutions in which the above-the-suction effect depends on the transported * ·. : "f 118044 2 searches are directed downward from the underside of the box to remove the veneer from the vacuum transport effect.

When operating with these known solutions, the veneer undergoes considerable stress during the removal of the suction conveyor when it is pulled off the support of the vacuum, either by mechanical presses or by air jets. However, this function has caused problems when handling veneer cut from thin and / or brittle wood species. Breakage of veneers during the peeling off phase is remarkably common.

These problems have been substantially improved by the apparatus of the invention. The basic structure of the apparatus is a conventional suction belt conveyor comprising a vacuum container box structure having at its bottom surface provided with at least one slit flow path arranged in the direction of transport of the apparatus; for optional closure, the means for closing the flow path are provided with means for directing a flow of compressed air to the removable sheet-like object, at least in the closing position of the members. The invention is characterized by apparatuses, such as release means for pressing sheet-like objects out of the vacuum suction • ♦ ... pressure relief air flow to the flow path closure means is derived from the operating currents of the release means pneumatic actuator.

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Further features of the invention will be apparent from the following dependent claims.

The invention will be explained in more detail with reference to the accompanying drawing, in which: -. Fig. 1 illustrates an apparatus according to the invention in an operating position, in which the veneer is supported in its transport position and • * ··· '· ···· «• * 3 118044

Figure 2 illustrates the apparatus in an operating position where the veneer is pressed into the pink to be formed.

Figure 1 is a cross-sectional view of the apparatus of the invention as seen in the transport direction of the veneer. The basic structure of the apparatus is constituted by a box structure which maintains a negative pressure in relation to the environment by the fan 1. The lower surface of the box is formed as a conveying surface by providing the lower surface with two suction slots 3 disposed substantially in the conveying direction. A conveyor belt 13 is disposed adjacent to each suction slot, which in the conveying direction runs in drag contact against the underside of the box. Conveyor belts are usually provided with a one-way Conveyor Movement such that the belts pass along an endless passage with the return path above the box. The return path may also be located inside a box. The veneer 4 from the cutter or other processing device is guided into contact with the underside of the box, whereby it is subjected to a vacuum exerted through the slots 3, and remains under this vacuum against the conveyor belts 13 until it is released for lowering into the pink.

In order to remove the veneer from the effect of the vacuum in the conveyor belts, the apparatus includes presses 12. The presses are strip-like structures extending substantially in the region of the pink to be formed as the transport directions of the veneer. . The presses are provided with an actuator or actuators 8 which, in the embodiment illustrated, are dual-acting pneumatic cylinder piston devices. In actuator 8, pressers 12 are pressed against the veneer 4 above the die to be formed, whereby the veneer is forced to release from the vacuum suction effect, and the veneer is pressurized. top of the pink.

* · · '• · * *.

• · ·, · | In addition to the above-described basic structures, the device according to the invention has

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* ·. · *. ···. closure members 5 disposed adjacent the slots 3, which, in the embodiment shown, have their own actuators 6. The closure members extend substantially in the conveying direction of the apparatus • · | . over the area of the pink to be formed. With these closing members 5, each of the suction slots can be sealed »· 118044 4 during the step of removing the veneer sheets 4. Cutting the suction through slits 3 substantially reduces the force required to be exerted by the presses 12 on the pink printable veneer sheet to cause it to release from its transport position and descend into the formed pink. Preferably, the closure members are also provided with seals 7 to ensure the intended operation of the members.

In addition to closing the suction slots 3, the apparatus according to the invention may also include means for exerting a releasing blowing effect upon the veneer removal step. This blowing effect is preferably achieved by nozzles located on the underside of the closing members 5. Compressed air is supplied to the nozzles during the stripping step 4 of the veneer sheet. Preferably, air is drawn into the nozzles from the pneumatic actuator of the pushers 12, either from the actuator discharge side outlet 9 'or from the actuator activation pressure side 9, or alternatively simultaneously, as required.

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Claims (1)

118044 Claim: Apparatus for introducing and positioning sheet-like objects, in particular plywood veneers (4), on a bench (11) comprising a depressurized box structure having at least one slit flow path (3) disposed along the flow path in the transport direction of the apparatus. (13) for transferring sheet-like objects through the flow path under the suction effect of a negative pressure, the closure means (5) for optionally closing the flow path (3) extending over the tread formed substantially in the conveying direction, the means (5) for closing the flow path (3) (4) at least in the closed position of the members (5), characterized in that it has release means (12) for pressing the sheet-like objects out of the suction effect of the vacuum and that the compressed air flow to the closing means (5) is derived from the operating currents of the pneumatic actuator (8) of the release means (12). • · * ·· '• · 1 ··· 1 t · • 1 • 1 · «1 ··! - ♦» • «1 • · • · * · · · · · 1 · * · · • · • · * · · · · ················································································································································ · tillfora och ställa arkformiga föremäl, i synnerhet fanerark (4) i en stapel (11), wavering anläggning omfattar en vacuum-loading laden construction, som sin undre yta försedd med ätminstone en, anläggningens transportriktning placerad spaltformig flödesä flödesvägen placerade trans-portorgan (13) förflyttning av de arkformiga föremälen buma av sugverkan av det via flödesvägen web undertrycket, tillslutningsorgan (5) som i transport-riktningen sträcker sig väsentligen Över stapeln som skall bildas 3), lively organ (5) för tillslutning av flödesvägen (3) är för- sedda med med för att röst en en tryckluftström tår arkformigt föremäl (4), som scall lösgöras, ätminstone i organens (5) tillslutningsläge, tännetecknad därav, att den uppvisar lösgöringsmedel (12) för att trycka de arkformiga föremäl. tryckluftsströmmen account de organ (5) som tillsluter flödesvägen är ledd frän funktionsströmmarna för lösgöringsmedlens (12) pneuma -iska drivanläggning (8). • · I • 1 1 ♦ * * · · · · · · · 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ··. * 1 1 • 1 n ··· «· · • · · ···. * · • «« ··· # t ^ • · • • • • • • • • f * «·· *; '/ ·