EP2158070B1 - Transport device for a finger jointing system - Google Patents

Abstract

A transport device for a system for finger jointing pieces of wood, by packets, has a support. Transport means are provided, which are set up for moving the pieces of wood sliding along the support to the system for finger jointing. The transport means have a gripping device for holding the pieces of wood in place by packets, aligned flush at a first end, which is situated upstream, while the pieces are being pulled to a work station by way of the support.

Description

The present invention relates to a transport device for a system for finger-jointing of wood pieces with a 5 edition according to the preamble of claim 1 and a transport method according to the preamble of claim 4.

Such a transport device and such a transport method are out DE 4 312 169 C1 known.

Such devices are for Längsverleimung of rod-shaped pieces of wood, ie for slats, boards, planks and beams, in use. To permanently join the pieces of wood, the technique of finger-jointing is applied. For this purpose, the pieces of wood are sawn at their ends in appropriate finger-jointing lines, milled, glued and finally pressed. Depending on the system, these steps can either be performed in a single machine or functionally divided into individual machines.

Two types of wedge galvanizing systems are widely used: In the case of individual machining, the frontal machining is carried out with one piece of wood in each case. When working in packages, several pieces of wood are worked on together to increase performance, to minimize the splintering of the pieces of wood and to achieve an exact glue application. The pressing process always takes place in a separate press.

In the case of package systems, one differentiates between two different versions. In the central package system, only one central processing station for the simultaneous or serial processing of each two Holzpaketenden on both sides of the machine is present. It is a proven, long-standing technique. However, the running meter performance no longer meets today's requirements. Therefore, this system was almost completely displaced by the second type of plant, each with a separate processing station per package end. The disadvantage here is that the additional station results in a higher susceptibility to interference and additional space requirements.

For all types of equipment mentioned above, the transport of the pieces of wood in the longitudinal direction is carried out with conveyor belts or roller conveyors. The acceleration of the pieces of wood during transport takes place via static friction between conveyor rollers, conveyor belt and pieces of wood. The maximum acceleration values of the pieces of wood are therefore limited by the low static friction between them and the conveyor belt, as a result of which the overall working speed of the installation is reduced.

In the conventional systems, the alignment of the pieces of wood on the end of the package takes place in that the pieces of wood are conveyed longitudinally against a Rüttelanschlag. Here, the Rüttelanschlag pulsates in the conveying direction by about 1-5 cm, thereby supporting the alignment of the pieces of wood.

In order to achieve a uniform quality of wood, the areas of the wood pieces that have defects or irregularities such as knotholes are shortened by means of sawing. The lengths of wood within a bundle of wood can therefore vary greatly, with the longest piece of wood having up to ten times the length of the shortest piece of wood. The shorter pieces of wood must therefore move along the long pieces of wood during alignment within the overall package. The disadvantage here is that the friction between the pieces of wood hinders this relative movement.

While the longer pieces of wood are already on the Rüttelanschlag and further promoted against the Rüttelanschlag with spinning rollers, the short pieces of wood move towards the stop. In this case, the positions of the long pieces of wood can change transversely to the conveying direction on the stop side and they are consequently aslant. Once the long pieces of wood have tilted at an angle, additional forces increasing the skewing occur. As a result, and because of the static friction between the front ends of the pieces of wood and Rüttelplatte a provision is difficult or impossible at all. Any inaccuracies in the geometry of vibrating plate and roller conveyor reinforce the tendency to skew.

By tilting the passage of the short pieces of wood between the long pieces of wood or between the long pieces of wood and side wall is narrowed so that the short pieces of wood do not penetrate to the end stop and get stuck on the way.

Although some systems have electronics to detect the sticking of the short pieces of wood and to remedy the jam by various mechanical cycle movements. However, the electronics on the one hand consuming and also prone to failure. On the other hand, not all faults are detected. Even if this succeeds, but usually a manual intervention is required and associated with their elimination a time delay in the workflow.

The present invention is therefore based on the object to propose a system that has over the prior art improved reliability and also allows a higher operating speed.

The object underlying the invention is achieved by a device having the features of patent claim 1.

According to the invention a transport means is provided for the transport device, which is adapted to move the pieces of wood over a support.

Advantageously, the pieces of wood may be more accelerated and decelerated by pulling or pushing than by a moving support such as a conveyor belt or rollers, thereby improving the working speed of the transport cycle. In addition, a jamming of the wooden packages is difficult, which significantly improves the reliability of the system.

According to the invention, a gripping device is provided for the means of transport.

A particularly large force can be exerted by the gripping device on the pieces of wood. These are therefore fixed particularly firmly and safely in their position to each other. In addition, the position is fixed relative to the gripper particularly secure.

According to the invention, the gripping device is set up to grasp and clamp pieces of wood on its longitudinal sides and on the upper side at the end which is located upstream by means of a tensioning device.

Advantageously, a pressure is exerted by a tensioning device at the package end of both longitudinal sides of a wooden package with a plurality of pieces of wood, which compresses the pieces of wood frictionally. Since the pieces of wood are encompassed at the end of the package, which is upstream, ie in the transport direction is located, the wooden package is pulled by the gripping device and not pushed. As a result, the reliability is further increased because the individual pieces of wood can not wedge.

Advantageously, the gripping device has at least one clamping device with a clamping cylinder.

Advantageously, the force for grasping and holding the wooden package is thereby produced. High pressures can be achieved, which are easily adjustable and adaptable to the width and height of the wood package.

According to the invention, a slider is provided for the means of transport, which is arranged to push the pieces of wood upstream.

Advantageously, so the movement of the gripping device can be used in the transport direction to promote a further wooden package. A further advantage is that the different wood pieces of the wood package are aligned flush with the front by the sliding process.

In a further development of the invention, the slider can be raised or lowered by means of a lifting device.

Advantageously, the slider is lowered for pushing and aligning, so that its contact surface bears against the end faces of the pieces of wood. If the slide is returned to its original position counter to the transport direction, then it is lifted so that it does not come into contact with the following piece of wood or wooden package and interfere with its transport.

In a further development, the support is designed as a trough tub with side walls such that their distance from one another is adjustable.

Advantageously, the pieces of wood can slide along the support surface of the trough, without the need for transport rollers or the like. A wooden package is guided during transport from the side walls. Since the distance of the side walls is adjustable to each other, the support can be adapted to different widths of the wood packages.

In a further development of the invention, the support comprises conveying elements, in particular driven roller conveyors, which act counter to the transport direction.

Advantageously, this supports the flush alignment of the pieces of wood.

According to the invention, the transport means can also be set up to move the pieces of wood in packages over the support.

Advantageously, a particularly high processing speed can be achieved.

Furthermore, the present invention relates to a means of transport for a plant for finger-jointing of pieces of wood with a Pad, wherein the transport is arranged to move the pieces of wood over the pad.

Furthermore, the present invention relates to a method, with the features of claim 4, for transporting pieces of wood in a system for finger-jointing, wherein the pieces of wood are moved by a transport over a support.

Advantageously, the pieces of wood are moved in packets.

• FIG. 1 eine Draufsicht der erfindungsgemäßen Transportvorrichtung für eine Anlage zur Keilverzinkung von Holzstücken;
• FIG. 2 eine Draufsicht der Vorrichtung aus FIG. 1 nach Bearbeitung der Holzstücke;
• FIG. 3 eine Draufsicht der Vorrichtung aus FIG. 1 beim Rücklauf der Bearbeitungsstation;
• FIG. 4 eine Draufsicht der Vorrichtung aus FIG. 1 nach Durchtransport eines Holzpakets durch die Bearbeitungsstation;
• FIG. 5 eine Draufsicht der Vorrichtung aus FIG. 1 vor Bearbeitung eines Holzpakets;
• FIG. 6 eine Draufsicht der Vorrichtung aus FIG. 1 mit dem Transportmittel in seiner Endposition;
• FIG. 7 eine Draufsicht der Vorrichtung aus FIG. 1 mit dem Transportmittel beim Rücklauf in seiner Anfangsposition;
• FIG. 8 einen Vertikalschnitt durch die Transportvorrichtung;
• FIG. 9 einen Vertikalschnitt durch die Transportvorrichtung wie in FIG. 8 mit einem Holzpaket geringerer Höhe;
• FIG. 10 einen Vertikalschnitt durch eine andere Ausführungsform der Transportvorrichtung mit zwei Holzpaketen;
• FIG. 11 einen Vertikalschnitt durch die Transportvorrichtung aus FIG. 10 mit zwei Holzpaketen unterschiedlicher Höhe;
• FIG. 12 eine Draufsicht der Transportvorrichtung mit Schieber im Detail;
• FIG. 13 die Transportvorrichtung mit Schieber in einer Seitenansicht.

The invention will be described in more detail below with reference to the drawings. Show it:

• FIG. 1 a plan view of the transport device according to the invention for a system for finger-jointing of pieces of wood;
• FIG. 2 a plan view of the device FIG. 1 after processing the pieces of wood;
• FIG. 3 a plan view of the device FIG. 1 at the return of the processing station;
• FIG. 4 a plan view of the device FIG. 1 after transporting a wooden package through the processing station;
• FIG. 5 a plan view of the device FIG. 1 before processing a wooden package;
• FIG. 6 a plan view of the device FIG. 1 with the means of transport in its final position;
• FIG. 7 a plan view of the device FIG. 1 with the transport in the return in its initial position;
• FIG. 8th a vertical section through the transport device;
• FIG. 9 a vertical section through the transport device as in FIG. 8th with a wooden package of lesser height;
• FIG. 10 a vertical section through another embodiment of the transport device with two wooden packages;
• FIG. 11 a vertical section through the transport device FIG. 10 with two wooden packages of different heights;
• FIG. 12 a top view of the transport device with slider in detail;
• FIG. 13 the transport device with slider in a side view.

To give an impression of the function of the system according to the invention, is based on the FIG. 1 to FIG. 7 a complete cycle of Appendix 1 with the operations described below.

FIG. 1 shows a plan view of the transport device according to the invention for a plant for finger-jointing of pieces of wood. It is shown the transport means 3 according to the invention. This has a gripping device 50 with a clamping device 5 and a pneumatic clamping cylinder 7. By means of the tensioning device 5 is a wooden package with a plurality of pieces of wood 2 clamped by the clamping cylinder 7 via two opposite contact surfaces 15 (not shown, see FIG. 8th ) exerts pressure on both longitudinal sides of the wooden package with a plurality of pieces of wood 2 and thus holds the wooden package with a plurality of pieces of wood 2 relative to the gripping device 50. The pieces of wood 2 of the wooden package are so particularly firmly and securely fixed in position to each other. A mutual displacement or tilting of already aligned pieces of wood 2 is not possible during transport, which significantly improves the reliability of the system 1. As a result, the wood package with more pieces of wood 2 can be more accelerated and decelerated, whereby the working speed of the transport cycle is improved. By the pneumatic clamping cylinder 7 can high pressures which are well adjustable and adaptable to the width of the wood package.

Below the transport means 3 is a trough 9. The trough 9 serves with its side walls 16 as a receptacle and guide for the wooden packages that slide along it. By adjusting the distance of the side walls 16 to each other, the recording can be adapted to different widths of the wood packages with several pieces of wood 2. The transport means 3 is mobile and can perform a linear translational movement along the trough 9. As drive two electric motors 12 are provided, which are located on two sides of the transport means 3. The electric motors 12 each engage by means of a gear 17 (not shown) in parallel to the sides 16 of the trough 9 extending racks 18 and thus generate the propulsion. During the movement, the wooden package with several pieces of wood 2 along the trough 9 is pulled sliding. By pulling the reliability is further increased because the individual pieces of wood 2 can not wedge.

At the transport means 3, a slider 6 is further provided, which simultaneously pushes another wooden package with several pieces of wood 8 upstream with the movement of the transport means 3. In addition, the different pieces of wood 8 are aligned flush with the end by the movement. The transport 3 transports the wooden packages with several pieces of wood 2, 8 to a central workstation 4, the saws 20, milling 21 and glue rollers 22 has. As a result, the sawing, milling and gluing two Holzpaketenden is possible in one step. Nevertheless, a higher mileage is achieved than with separate stations. In the area of the trough 9, a further tensioning device 10, 11 is provided in front of and behind the workstation 4. Reached a flush-lined package end the workstation 4, then it is clamped by the front tensioning device 10 again and held. Likewise, an end of a further wooden package with a plurality of pieces of wood 14 is clamped by the rear tensioning device 11 and held. During simultaneous processing, the two wooden packages with several pieces of wood 8, 14 are securely fixed. During the processing operations, ie sawing, milling and gluing, the workstation 4 moves up and down perpendicular to the direction of movement of the gripping device 50.

Behind the workstation 4, the trough 9 extends further, so that the processed wood piece pacts can be transported and pressed (press not shown).

The entire described operations, so u.a. the gripping of the pieces of wood 2, 8, 14, the movement of the means of transport 3 in the direction of the work station 4, the return of the means of transport 3, the sawing, milling and gluing of the pieces of wood 2, 8, 14 by the workstation 4, etc., by means of a central Control (not shown) coordinated and matched. However, the control is not shown and described here since the necessary adjustment of the control is obvious to the person skilled in the art.

FIG. 2 shows a plan view of the device FIG. 1 after processing the pieces of wood. The workstation 4 has moved to an opposite position.

FIG. 3 shows a plan view of the device FIG. 1 at the return of the processing station.

FIG. 4 shows a plan view of the device FIG. 1 after transporting a wooden package through the processing station. The processing station 4 has already returned to its original position as in FIG. 1 reached. The processed wooden package is removed for pressing and is about to leave the plant 1. The transport means 3 moves in the direction of the processing station 4 and thereby pulls the aligned at its front end timber package 2. At the same time, the wood package 8 is pushed both upstream and aligned by means of the slide 6.

FIG. 5 a plan view of the device FIG. 1 before processing a wooden package. It is shown how the wooden package 8 is transported by the slider 6 through the processing station 4.

FIG. 6 a plan view of the device FIG. 1 with the transport 3 in its final position. Here, both the gripping device 50 and the slider 6 have reached their maximum position in the direction of the processing station 4. Both wooden packages are respectively clamped by the front 10 and rear clamping device 11 and can then be processed in the fixed position.

FIG. 7 a plan view of the device FIG. 1 with the transport 3 during the return to its initial position. When returning the slider 6 is raised by means of a lifting device 23, so that he does not come with the wooden package with several pieces of wood 2 is not in contact and its transport bothers.

FIG. 8th shows a vertical section through the transport 3. There are the contact surfaces 15 shown, via the means of the pneumatic clamping cylinder 7 on the wooden package with several pieces of wood 2 pressure is exerted to hold this. Another, arranged on the top of the clamping cylinder 30 exerts an additional pressure from above, so that the wooden package is encompassed with several pieces of wood 2 from three sides.

FIG. 9 shows a vertical section through the transport 3 as in FIG. 8th with a wooden package of lesser height. The illustration shows how the system 1 can be adapted to pieces of wood with different heights.

FIG. 10 shows a vertical section through another embodiment of the transport means 3 with two gripping devices, in which two wooden packages with several pieces of wood 40, 41 are clamped. The simultaneous transport of two wooden packages increases the performance of the system 1.

FIG. 11 shows a vertical section through the transport 3 as in FIG. 10 with two wooden packages of different heights. The illustration shows how the other embodiment of Appendix 1 can be adapted to pieces of wood with different heights. It is thus the simultaneous processing of wooden packages with different heights possible.

FIG. 12 shows a plan view of the transport 3 with slider 6 in detail.

FIG. 13 shows the transport device with slider 6 in a side view. The transport 3 can be moved in the horizontal direction of transport. The drive is provided by electric motors 12. The rotation of the motor shaft (not shown) is via a gear 17 (not shown) and a rack 18 implemented in a linear motion. The slider 6 can be raised or lowered by means of a lifting device 23. Is lowered, the slider 6 for pushing and aligning, so that its contact surface 24 abuts the end faces of the pieces of wood 2. If the slider 6, however, moved back to its original position against the transport direction, then it is raised so that it does not come into contact with the following wooden package and interfere with its transport.

Claims (4)

1. Transport device for a system (1) for finger jointing pieces (2, 8, 14) of wood, by packets, having a support (9) for guiding a packet of the pieces (2, 8, 14) of wood, characterized in that transport means (3) are provided, which are set up for pulling the packet of the pieces (2, 8, 14) of wood sliding along the support (9) to a work station (4) of the system (1) for finger jointing, that the transport means (3) have a gripping device (50) for holding the packet of pieces (2, 8, 14) of wood in place with a flush-aligned end that is situated upstream, while the packet is being pulled to the work station (4) by way of the support (9), and that the transport means (3) have a pusher (6) that is set up to push another packet of the pieces (2, 8, 14) of wood simultaneously farther upstream, and, in doing so, to align them flush at the other end.
2. Transport device according to claim 1, characterized in that the gripping device (50) is set up for grasping and clamping pieces (2) of wood on their longitudinal sides and at the top at the flush-aligned end by means of a clamping device (5).
3. Transport device according to claim 2, characterized in that the gripping device (50) has at least one clamping device (5) having a clamping cylinder (7).
4. Method for the transport of pieces (2, 8, 14) of wood for a system (1) for finger jointing, by packets, characterized in that a packet of the pieces (2, 8, 14) of wood is pulled sliding along the support (9) to a work station (4) of the system (1) for finger jointing by transport means (3), whereby a gripping device (50) of the transport means (3) holds the packet of pieces (2, 8, 14) of wood in place with a flush-aligned end that is situated upstream, while the packet is being pulled to the work station (4) by way of the support (9), and that a pusher (6) pushes another packet of the pieces (2, 8, 14) of wood simultaneously farther upstream, and, in doing so, aligns them flush at the other end.

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