EP1533259A1 - Unstacking device with a friction roller device - Google Patents

Abstract

Device for removing wooden boards from a stack (1) comprises a roller element (5) that rests on the uppermost wooden board (2) and laterally removes the wooden board from the stack. When the roller element is laterally displaced, the uppermost board is moved out its starting position by friction and toward a board-transporting device (7, 8). During transport of the board on the board-transporting device, the roller element rolls off the board back into the starting position. An independent claim is also included for a process for removing wooden boards from a stack.

Description

The present invention relates to a device for pushing off Wood-based panels from a pile.

The term "wood-based panels" covers here coated and uncoated Chipboard, OSB, MDF, HDF and other wood fiber boards as well as other boards Wood layers or pieces.

Such plates regularly increase during their production or processing Stacked stacked plates and then again by plates taken from the top to the bottom of the stack. This happens, for example before grinding, sawing, coating or inspecting plates.

There are a variety of designs of devices for losing weight or Pushing away such wood-based panels known from a stack.

The present invention is based on the technical problem of a novel and advantageous apparatus and a corresponding method for pushing off Specify wood-based panels of stacks.

The invention is directed to a device for pushing off wood-based panels from a stack with a resting on a topmost wood-based panel Rolling element with which the device laterally push the plate away from the stack can, characterized in that the rolling element relative to the stack side is movable and the device is designed to be on the top plate aufliegendem rolling element, the top plate by a lateral displacement of the Rolling element to take out of a starting position by friction and be supplied to a plate conveyor, in a further transport of the Plate through the plate conveyor the rolling element lie on the plate and let it roll on and lying on the stack and rolling to the starting position move back.

Likewise, the invention is directed to a corresponding method. preferred Embodiments are given in the dependent claims and are explained below. The description refers both to the device character as well as the method character of the invention without intervening to explicitly distinguish between these two categories.

The invention is based on the topmost wood-based panel by a side displaceable "driver" to remove from the stack. "Side" means here that the plates are essentially in one direction in their plate plane, ie in the Substantially perpendicular to the stacking direction, to be "pulled off" laterally. To the driver builds a friction to the top plate and takes this its lateral displacement over a certain distance with. This allows the Plate, in particular with its front edge in the direction of displacement, one be fed to another plate transport device, which the withdrawn plates can continue to transport.

As soon as this plate transport device has taken on the onward transport is the carrier is no longer needed for transport. Instead of him now from the plate but lift off and move back to the starting position, sees the invention, however before him to simplify and / or to speed up the movement to let lie. This can be used if necessary cycle time advantages. therefore the driver is designed as a rolling element, which during the shifting the plate is not freed by friction but blocked or at least slowed down is, in the individual case even the takeaway can be propelled supportive. On the other hand, the same rolling element in the shift back to the starting position on the plate and possibly also on the underlying plate, generally speaking so on the stack, unroll. This is the onward transport through the Plate conveyor not obstructed. By the way, the plate conveyor needs to be not necessarily to the claimed object, namely the device for removal, but is preferably included.

The term "rolling element" is used here in the sense that including rollers, rollers and other constructions rotating about an axis, but also belt constructions, Chain constructions and comparable rolling constructions with one Majority axes are included. For the invention, it ultimately comes down to the rolling motion that can be achieved with all these designs. The easiest and therefore preferred is of course a roll or roll, which also provided several times can be.

Compared to a solution with a driven roller whose axis is during the operation of the device remains unchanged locally, the invention has the advantage that the driver also used for pushing away thick boards and protective boards can be what usually happens.

A preferred embodiment is also a freewheel, which in one direction locks and thus generates the desired friction for driving the plate and in the other direction turns freely and therefore when moving back to the starting position can roll. This freewheeling role is preferred in the invention insofar simply provided, as only one axis (in the geometric sense) is present. The role and the axis can of course be realized in several parts.

The rolling element can already by its own weight or by a corresponding Weighting to generate sufficient friction. Preferably, however, it is acted upon by a pressure spring and thus presses on the top plate. Particularly preferred here is a pressure cylinder, in particular a pneumatic cylinder, as a pressure spring.

The rolling element can be provided in particular on a pivotally mounted lever arm be, wherein the pressure can be generated by a cylinder, the one exploits substantially vertically directed degree of freedom of movement of the lever arm.

Preferably, the pressure cylinder is controllable, so it can be at different operating phases generate different forces. It will then in the course of takeaway the plate by friction, a higher pressure than when moving back into the Starting position generated. In the latter phase of operation, the pressure can also omitted completely or relieved the role even in terms of its own weight become. This is especially true for sensitive plate edges or thicker plate edges be advantageous when rolling over an edge by force Rolling elements quality losses are to be feared.

An essential advantage of the invention lies in the high achievable working speeds the device. In this regard, it is further preferred as an optional feature, that the rolling element is already displaced back while the plate conveyor the plate immediately before taken by the rolling element weiterertransportiert, wherein the rolling element is preferably its starting position already reached or reached when the plate leaves the stack. It can then without much further delay with moving the next plate to be started.

The corresponding movement of the backward displacement also preferably proceeds faster, d. H. at higher speeds and / or accelerations, than the plate entnehmende shift.

The plate transport device is according to a favorable embodiment, a roller work, d. H. a set of two (possibly multi-part) paraxial rollers, one of which is located above and below the plate transport plane. This Roller mechanism grips plates between the rollers and pulls them through a gap between the roles. This gap can be pressed through the plate, so to speak be and also be preset. It is also possible, and in the context of this invention prefers that one of the rollers, preferably the upper, vertical is adjustable and is lowered in response to the shrinkage of the plates. In order to Can better friction to the plates by a corresponding pressure be generated without edge damage are to be feared by the role in Passing through edges is relieved or raised.

Preferably, only one of the two rollers is driven, preferably the lower one.

The roller work, or more generally the plate transport means provided in the invention may have a stop that under the actual plate transport plane and arranged in the transport direction in front of the disc transport device is. This prevents accidental pulling in possibly due to friction brought along second-highest or third-highest plates and is especially then advantageous if a subsequent processing station necessarily completely isolated Requires plates, such as a grinding station.

Furthermore, the plate transport device can have at least one inclined contact surface upstream, the entrained plate from below or from above in vertical Introduce direction in the plate conveyor.

In a preferred embodiment, which is shown as an exemplary embodiment, are the aforementioned measures combined, with at least one contact surface below the plate transport plane and is designed to be vertically movable. she can be kept sprung in particular. Then she can accidentally Intake of two adherent plates by the lower undesirable Plate are deflected down, causing this unwanted plate against the mentioned stop is running. Is now the overlying "desired" plate gone through and the plate transport device so again free so presses Tread the second plate up and into the plate conveyor into it.

Fig. 1

zeigt eine schematisierte Seitenansicht einer erfindungsgemäßen Vorrichtung in einer ersten Betriebsphase.

Fig. 2

zeigt eine schematisierte Seitenansicht einer erfindungsgemäßen Vorrichtung in einer zweiten Betriebsphase.

Fig. 3

zeigt eine schematisierte Seitenansicht einer erfindungsgemäßen Vorrichtung in einer dritten Betriebsphase.

Fig. 4

zeigt eine detailliertere Ausschnittdarstellung zu Fig. 2.

Fig. 5

zeigt einen Fig. 4 entsprechenden Ausschnitt für einen abweichenden Betriebszustand.

Fig. 6

zeigt eine Detailansicht zu den Figuren 4 und 5 in abweichender Perspektive.

The invention will be explained in more detail below with reference to an embodiment, wherein the individual features may be essential to the invention in other combinations.

Fig. 1

shows a schematic side view of a device according to the invention in a first phase of operation.

Fig. 2

shows a schematic side view of a device according to the invention in a second phase of operation.

Fig. 3

shows a schematic side view of a device according to the invention in a third phase of operation.

Fig. 4

shows a more detailed sectional view of FIG. 2.

Fig. 5

shows a Fig. 4 corresponding cutout for a different operating condition.

Fig. 6

shows a detailed view of Figures 4 and 5 in a different perspective.

Fig. 1 shows a stack 1 of stacked MDF boards. The right edge of the stack 1 is shown twice in the figure, whereby the device Processable size range of plates should be displayed. A top plate 2 in the stack 1 is shown as a solid horizontal bar. including lying Plates are similar; The same applies to a drawn in the left portion of Figure 1, but not figured plate.

Above the plate 2 and the stack 1, a carriage 3 is suspended, which, like the horizontal pointing to the left arrow illustrates, is horizontally movable. He is wearing one Articulated arm 4 with a roller 5 at its end. The articulated arm 4 is through a Pneumatic cylinder 6 subjected to vertical force, as the vertically directed arrow illustrates. In the state shown in Fig. 1, the carriage 3 and thus the Wheel 5 is moved to the left and pressed as a driver on the plate 2. The Plate 2 is held by friction on the locked wheel 5 and slides over the underlying plate in the stack 1 to the left. This leads to that in FIG. 2 illustrated situation in which the left, ie in the direction of movement front edge the plate 2 through an upper and a lower inclined contact surface into a Gap between two rollers 7 and 8 of a roller work has been performed. The roller work Figures 7, 8 and the associated parts will become more apparent from Figures 4 to 6 explained.

In the state according to FIG. 2, the roller work 7, 8 has already gripped the plate 2 and transported with rolling friction on to the left. Once the plate 2 of the Roller unit 7, 8 has been gripped, the carriage 3 moves back to the right, wherein the roller 5 is not locked, as in the state in Fig. 1, but in the clockwise direction free running. So it is a freewheel role. This rolls the role 5 over the plate 2 and finally the underlying plate to the starting position from. In this case, the pneumatic cylinder 6 is relieved, so that the roller. 5 only loosely rests on the plate 2. In the figures 1 to 3 is further indicated that the plate 2 after passing through the roller unit 7, 8 on a transport path continues left.

In Fig. 3 shows how the carriage 3 is in the starting position and the Pneumatic cylinder 6 builds pressure down again. The situation is already happening before the plate 2 has passed completely through the roller unit 7, 8.

In this embodiment, the carriage 3 accelerates in the operating phase to Fig. 1 at maximum speed. The plate is shown in FIG. 2 at this speed from the roller work 7, 8 at the same or preferably higher speed taken over, whereupon the carriage 3 in the opposite Direction again moved to the right. Since in this phase of operation a lesser or no pressure on the roller 5 loads, higher speeds can be used without damaging the panels or their edges.

Finally, FIGS. 1 to 3 show two light barriers 9 indicated symbolically and 10, with which the passage of the plates through the roller unit 7, 8 controlled becomes. The corresponding signals are used after passing a front plate edge through the photocell 9 lower the upper roller 7 under pressure and allow the plate to grip and after passage of the rear plate edge through the Photocell 10 to relieve the upper roller or slightly upwards zurückzuahren to ensure a smooth entry of the subsequent plate. By contrast, the lower roller 8 is not vertically movable, but in contrast to the roller 7 driven in a counterclockwise rotation. In this case, the role 8 runs defined speed. This is equal to or preferably higher than the speed the displacement of the roller 5.

Figures 4 to 6 show further details of the construction of the roller work.

Fig. 4 shows the situation of Fig. 2 and added to Fig. 2 that the plate 2 on a Guide plate 11 is running. This baffle is hinged at its left end and further to the right of a spring cylinder 12 supported. It forms in Fig. 4 is a plane Support surface for the plate 2, as far as it is not held by the roller 8. The right end of the baffle 11 is angled downwards and designated 13. This is the lower sloping contact surface. An upper one sloping contact surface 14 belongs to a vertically adjustable, but while of operation non-moving baffle 15. The adjustment can be both mechanical by hand drive or motor.

Further, in the lower region upstream of the roller unit 7, 8 a stop 16 is provided, which projects into recesses of the guide plate 11. The upper end this stop 16 is just below the transport plane of the plate. 2

FIG. 5 shows that here in a situation analogous to FIG. 4, inadvertently a second top plate 17 has been removed from the stack. This one has first by bumping against the inclined contact surface 13, the guide plate 11 after deflected down against the spring force of the cylinder 12 and is thus against the stop 16 encountered, which does not protrude beyond the baffle 11 in Fig. 4. The cylinder 12 now pushes the guide plate 11 and thus the plate 17 upwards. As long as, however the plate 2 is above the plate 17, it can not be moved upwards. However, if the plate 2 is similar to FIG. 1 with its rear edge over the stop Run away 16, the plate 17 can be pushed by the guide plate 11 upwards be and is now passed over the stop 16 and thus between the Rolls 7 and 8 brought.

Since this is due to the (see Fig. 1) anyway small distance between the successive Plates is almost takktig right, this helps again the drive by the carriage 3. In principle, the cylinder 12 could also be controlled and an exactly time-synchronized signal for the introduction of the plate 17 in the Deliver transport path.

Fig. 6 shows a seen in the direction of transport and partly cut view from which becomes clear how the stopper 16 passes through the baffle 11, but not over this protrudes.

Overall, it can be ensured that the plates, the roller unit 7, 8 exclusively leave in isolated condition.

Claims (13)

Device for pushing off wood-based panels from a stack (1) with a rolling element (5) lying on a top-most wooden board (2), with which the device can laterally push off the board (2) from the stack (1),
wherein the rolling element (5) is laterally movable relative to the stack (1) and the device is designed to
with the rolling element (5) resting on the uppermost plate (2), by frictional movement of the uppermost plate (2) by a lateral displacement of the rolling element (5) from a starting position and thereby fed to a plate transporting device (7, 8),
upon further transport of the plate (2) by the plate transport device (7, 8), the rolling element (5) lie on the plate (2) and allow it to roll on the stack (1) lying and rolling to move back to the starting position. Apparatus according to claim 1, wherein the rolling element (5) comprises a freewheel roller. Apparatus according to claim 1 or 2 with a pressure cylinder (6) for pressing of the rolling element (5) on the stack (1). Apparatus according to claim 3, wherein the impression cylinder (6) is controllable to Driving the plate (2) by friction with the rolling element (5) a higher Pressure and when rolling the rolling element (5) on the plate (2) a smaller To produce pressure. Device according to one of the preceding claims, which is designed that the rolling element (5) is moved back to the starting position while the plate transporting device (7, 8) which has been previously moved by the rolling element (5) entrained plate (2) transported further and until the plate (2) the stack (1) has left. Device according to one of the preceding claims, which is designed that the shifting back of the rolling element (5) faster than the previous one Moving the plate (2) through the rolling element (5) expires. Device according to one of the preceding claims, wherein the plate transport device a roller work (7, 8) is. Apparatus according to claim 7, wherein one of the rollers (7, 8) during operation the device with defined speed equal to or higher than the speed the displacement of the roller element (5) is driven. Device according to one of the preceding claims, wherein in the transport direction in front of the plate transport device (7, 8) and behind the stack (1) under a transport plane of the entrained plate (2) a stop (16) provided is that a possibly entrained second top plate (17) hold back can. Device according to one of the preceding claims with a transport direction arranged in front of the plate transport device (7, 8) and behind the stack (1) oblique contact surface (13, 14) for introducing the entrained Plate (2) in the vertical direction in the plate conveyor (7, 8). Apparatus according to claim 9 and claim 10, wherein the inclined abutment surface (13) below the transport plane and before the stop (16) arranged and is vertically movable to from a possibly entrained second top plate (17) under the top plate (2) to be deflected downwards, so the second uppermost plate (17) runs against the stop (16) and the contact surface (13) the second uppermost plate (17) after complete passage of the uppermost Plate (2) upwards and over the stop (16) in the plate conveyor (7, 8) can push. Method for pushing off wood-based panels from a stack (1) with a rolling element (5) resting on a top-most wooden board (2), with which the device laterally removes the board (2) from the stack (1),
characterized in that the rolling element (5) is moved laterally relative to the stack (1)
and the device, when the rolling element (5) bears on the uppermost plate (2), frictionally entrains the uppermost plate (2) by a lateral displacement of the rolling element (5) from a starting position and thereby feeds a plate transporting device (7, 8),
upon further transport of the plate (2) through the plate transport device (7, 8), the rolling element (5) lie on the plate (2) and rolls on it and slides back and forth on the stack (1) to the starting position. The method of claim 12 using a device according to one of claims 2 - 11.

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