WO2005053922A1

WO2005053922A1 - Device for inserting a veneer band

Info

Publication number: WO2005053922A1
Application number: PCT/EP2004/001381
Authority: WO
Inventors: Carsten Runge
Original assignee: Heinrich Kuper Gmbh & Co. Kg
Priority date: 2003-12-02
Filing date: 2004-02-13
Publication date: 2005-06-16
Also published as: CN100421892C; EP1699608B1; DE10356217B3; EP1699608A1; CN1905996A

Abstract

The invention relates to a device for moving a veneer band (16) in a veneer assembling machine (1) comprising a belt drive arranged between an insertion area (15) for the veneer band (16) and the moving mechanism (19, 21) for the veneer assembling machine (1). An abutment device (3) forms a retainer for the inserted veneer band (16) and is slightly remote from a peak (R) in the transporting direction (X) of the belt drive. The abutment device (3) comprises a first abutment element (4) arranged above the belt (10) and a second abutment element (7, 27) which is disposed laterally with respect to the belt (10) and moves between the first position thereof in which it is placed slightly above the belt (10) and the second position in which it is placed below the belt (10), thereby alternately providing a passage between the first and second abutment elements (3).

Description

Heinrich Kuper GmbH & Co. KG KU03120lPCT-β / Fi Bruchstr. 13-19 February 12, 2004 33397 Rietberg

Device for pulling veneer strips

Gabriel-Max-Strasse 29 ^• D-81545 Munich / Germany • Telephone + 49-89-6424 47-0 • Fax + 49-89-64 24 47-11 Reg.-No .: PR239 • info @ hoefer-pat. de • www.hoefer-pat.de Be honest

The invention relates to a device for pulling veneer strips into a veneer splicing machine, in which individual veneer strips are assembled essentially along the grain.

Veneer splicing machines are known from the prior art in various configurations. Machines of this type usually have a transport device consisting of an upper and a lower transport chain, by means of which the veneer strips are guided over a heating zone and are pressed together at their abutting edges. The veneer strips have an adhesive on their abutting edges, which can be cured by heating in the heating zone. The heat triggers a chemical reaction in the adhesive, causing it to harden and the veneer strips to stick together.

Various methods for the composition of wood veneers are known in the prior art, butt bonding in particular being of great importance. In the known machines used for this purpose, the veneer strips are manually inserted into an intake of the machine by an operator. The machine then pulls in the veneer strips when the operator actuates them and joins them together. Roller feeders and disc gear drives are used for this purpose. Such a roll feed is known for example from DE 19809772 Cl. Here, the veneer strips are placed on an upper and a lower roll by an operator. The lower infeed roller is then driven and the veneer strips between the two rollers are drawn into the machine. For switching on or off of the drive of the lower input roller ei ^¬ ne complex coupling device is provided. A veneer splicing machine has become known from DE 29717993 ül, which has a transport device with movable transport members. In this case, the transport chains are arranged at an angle to one another, a circumferential heating belt being provided between the two transport chains and being driven by the chains.

The known veneer splicing machines have problems with regard to their throughput time and the production costs, since the feeds pick up the veneer strips at a standstill and then accelerate them up to the speed of the transport chains. Only in the continuously running transport chains are the veneer strips glued together. This results in an intermittent and a continuous transport function, which can only be realized by two drives or by a correspondingly complex circuit with a clutch.

It is therefore an object of the present invention to provide a device for pulling veneer strips into a veneer splicing machine which, with a simple structure and simple, inexpensive producibility, enables fast and reliable pulling of veneer strips.

This object is achieved by a device having the features of claim 1, the subclaims show preferred developments of the invention.

The inventive device for feeding veneer strips into a veneer assembling machine in this case has the pre ^¬ in part, that it can be is particularly simple and inexpensive Herge ^¬. Here can be dispensed according to the invention in particular expensive additional drives and / or couplings ver ^¬. According to the invention, a belt is provided for this purpose in order ^¬ Synthesis belt drive, which lie between an ^¬ area for the veneers and the actual transport device of the veneer splicing machine is arranged. A two-part stop device is spaced somewhat in the transport direction of the belt drive from a vertex of the belt drive facing away from the machine, ie the vertex near the insertion area for the veneer strips. The two-part stop device comprises a first element arranged above the belt and a second element arranged laterally of the belt. The second element can be moved back and forth between two positions, a stop being provided for the veneer strips in a first position and transfer and transport of the veneer strips on the belt drive being made possible in the second position in order to feed the veneer strips to the assembly machine ,

Another advantage of the drawing-in device according to the invention is that the cycle time of the machine can be reduced since the next veneer strips can be placed on the stop device immediately after the veneer strips have been completely drawn in. As a result, the subsequent veneer strips can be fed in via the feeder as the first veneer strips pass through the veneer splicing machine, so that an almost continuous composition of veneer strips is made possible.

The second element of the stop device preferably has an inclined surface. As a result, in addition to the stop function, a clamping function can also be provided between the two elements of the stop device, so that the inserted veneer strips easily clamp on the stop device. This enables the veneer strips to be positioned securely on the feeder. According to another preferred embodiment of the invention the second element is formed as a roll of ^¬ so that a tapered or keilför ^¬ miger stop may also be provided for the veneer strips. In order to achieve a particularly secure positioning of the veneer strips, the second element of the stop device is preferably arranged on both sides of the belt drive. In this case, the second element is particularly preferably designed as a U-shaped rocker with inclined end faces, one leg of the U-shaped rocker being arranged on one side of the belt. The U-shaped rocker is simply moved by swiveling between the stop position and the transfer position. According to another preferred embodiment of the present invention, the second element of the stop device is designed as a U-shaped button with inclined end faces. The U-shaped button is moved back and forth between its two positions by a linear, ie vertical, movement. It should be noted that the U-shaped design of the second element enables actuation via a common drive. Of course, however, it is also possible to provide two separate components for the second element of the stop device, each of which can also be operated separately.

In order to enable a particularly simple transfer of the transverse strips resting against the stop to the belt drive of the feeder, the first element of the stop device is designed as a roller. Due to its own weight, the roll can exert a necessary pressure on the veneer strips in order to enable a safe transfer to the belt drive. Furthermore, an additional force can preferably act on the roller, which is exerted, for example, by means of a spring or pneumatically or hydraulically in order to increase the pressure.

A contact point of the stop device is preferably in a plane perpendicular to the transport direction through a ^pivot point of the roller. According to another preferred embodiment, the contact point from this plane is in the direction of transport spaced to ensure a particularly safe onward transport.

In order to make it easy to put the veneer strips on the stop device, a separator is preferably arranged at the insertion area for the veneers. The veneer strips can thus be easily aligned on the separator.

More preferably, the device according to the invention has at least one feed roller which is provided at the insertion area and under which the veneer strips are placed. The feed roller is inclined to the transport direction of the belt. The result of this is that the veneer strips are pressed together a little even when they are in place or, if there is a separator, pressed against this separator. This enables a feed to the feed area in exactly aligned position of the veneer strips.

The belt drive is preferably operated continuously and particularly preferably the belt drive is driven via a shaft of the transport device of the veneer splicing machine. As a result, no separate drive has to be provided for the belt drive of the infeed and the speed of the belt drive corresponds exactly to the speed of the transport device. As a result, no complex synchronization devices or devices for monitoring the speeds of the belt drive or the transport device have to be provided. The belt drive is preferably driven via a lower transport device of the veneer splicing machine. Here, preferably for driving the transport device of the machine for assembling the two drive wheels, for example, gears are provided, and a drive for the belt drive is arranged the toothed wheels on the same shaft between the at ^¬. In order to achieve a further reduction in the throughput time of the veneer strips, a sensor is preferably provided in order to detect a stop position of the veneer strips on the stop device and / or to detect a complete retraction of the veneer strips in the veneer splicing machine.

Preferred embodiments of the invention are described below with reference to the accompanying drawings. In the drawing is:

1 is a schematic side view of part of a veneer splicing machine with a feeder according to a first embodiment of the present invention,

2 is a schematic plan view of the machine of FIG. 1,

3 is a schematic perspective view of the machine shown in FIGS. 1 and 2,

4 is a side view of the feed of the machine according to the first embodiment,

5 is a top view of the feeder shown in FIG. 4;

6 is a schematic perspective view of the feeder shown in FIGS. 4 and 5,

7 is a schematic side view of part of a veneer splicing machine according to a second embodiment of the present invention in the starting position,

8 is a plan view of FIG. 7,

Fig. 9 is a schematic side view of the feeder of Fig. 7 in a passage position, and 10 is a schematic perspective view of the machine of FIG. 7.

A veneer splicing machine 1 according to a first exemplary embodiment of the present invention is described below with reference to FIGS. 1 to 6. The veneer splicing machine 1 is only partially shown for better illustration. The veneer splicing machine 1 comprises, in a known manner, a transport device with a lower transport chain 19 and an upper transport chain 21. The lower transport chain 19 is driven in the direction of the arrow via a shaft 14 and gearwheels 20a, 20b (cf. FIG. 1). The upper transport chain 21 is driven via a shaft 12 and gear wheels 22a, 22b in the direction of the arrow (see FIG. 1). Between the two transport chains 19, 21, at least two veneer strips arranged next to one another are transported to a heating device (not shown) in a known manner in order to connect the two veneer strips to one another.

The veneer splicing machine 1 further comprises a feed 2, which is shown in detail in FIGS. 4 to 6. The feeder 2 comprises a two-part stop 3, which is formed from a first stop element 4 and a second stop element 7, which touch at a contact point K. As can be seen in particular from FIG. 4, the first stop element 4 comprises a roller 5 and an actuating element 6 and the second stop element 7 comprises a rocker 8 and an actuating element 9. The first stop element 4 can be moved in the vertical direction and the second stop element 7 is round a pivot axis S pivotable. The rocker 8 has a surface 8a which is inclined to the transport plane or transport direction X of the veneer strips and which is essentially U-shaped (cf. FIG. 6).

Furthermore, the feeder 2 according to the invention comprises a belt drive with a circumferential belt 10, one on a shaft 12 mounted first deflection roller 11 and a second deflection roller 13 mounted on the shaft 14. The belt drive is driven via the shaft 14 and the second deflection roller 13 common to the gears 20a, 20b at the same speed as the lower transport chain 19.

The feeder 2 further comprises an insertion area 15, which can be seen in particular from FIG. 3 and is arranged adjacent to the first deflection roller 11. The insertion area 15 comprises a base plate, not shown, on which the veneer strips 16 can be placed. A separating web 18 is provided on the base plate, on which the two veneer strips 16 are placed in the manner shown in FIG. 3. Furthermore, two feed rollers 17a, 17b are arranged on the insertion area 15, one of the feed rollers being arranged to the right or left of the separating web 18. As can be seen from Fig. 2, the two feed rollers 17a, 17b are slightly inclined to the separating web 18 (by about 5 ° to 10 °), so that when the veneer strips 16 are inserted, the veneer strips by the feed rollers 17a, 17b each in the direction of Separator 18 are pressed. Due to their weight, the feed rollers 17a, 17b exert a predetermined force on the veneer strips 16. However, it should be noted that a spring force or a hydraulic or pneumatic force can additionally be applied to support the pressure force of the feed rollers 17a, 17b.

The function of the feeder 2 according to the invention is as follows: As shown in FIG. 1, the stop 3 forms a tapered stop in the starting position between the first stop element 4 and the second stop element 7. If, as shown in FIGS. 2 and 3, two veneer strips 16 to be glued on their lateral abutting edges are inserted and pushed forward in the direction of transport X by an operator, the two feed rollers 17a, 17b support a movement of the two veneer strips 16 towards one another , If the veneer strips 16 are advanced further, they meet the inclined surface 8a of the rocker 8 and are slightly guided upwards thereon.

As can be seen from Fig. 1, the stop 3 in its starting position forms a tapered stop, consisting of a jacket portion of the roller 5 and the inclined surface 8a, so that the two veneer strips abutting the stop 3 not only rest there, but also lightly are clamped between the first stop element 4 and the second stop element 7. The position reached can either be recognized by the operator or it is a sensor, e.g. a light barrier or a touch sensor is provided, which detects the stop position of the two veneer strips 16. In the next step, the operator either manually or by recognizing the stop position automatically swivels the second stop element 7 downward about the pivot axis S by means of the actuating element 9. Thus, the second stop element 7 is arranged below the belt 10, more precisely below the upper run of the belt. This clears a passage between the roller 5 of the first stop element 4 and the rocker 8, so that the two veneer strips come into contact with the continuously driven belt 10. The weight of the first stop element 4 and the actuating element 6 of the first stop element 4 support the pressing of the veneer strips 16 onto the belt 10, so that both veneer strips 16 are drawn in evenly by means of the belt 10.

As can be seen from FIGS. 2 and 3, the belt drive is arranged between the gear wheels 20a, 20b of the lower transport chain 19, so that the veneer strips 16 conveyed by the belt drive in the transport ^{direction ¬} device X are advanced between the lower and upper transport chains 19, 21 , Since the Rie ^¬ ment rubbing the same speed as the conveyor chains 19, 21 are having the two veneer strips without positioning tion change transported by the transport device of the veneer splicing machine and fed to the heating device, so that the two veneer strips 16 can be glued to their abutting edge.

As can be seen in particular from FIGS. 3 and 6, the inclined surface 8a of the rocker 8 has an essentially U-shaped shape, so that in each case a free leg is arranged on one side of the belt 10 of the belt drive. This enables the rocker 8 to be pivoted downward about the pivot axis 10. Furthermore, the roller 5 of the first stop element 4 has a width which is greater than the width of the belt 10, so that the roller 5 is at least partially arranged in the region of the legs of the U-shaped, inclined surface 8a of the rocker 8. The stop 3 of the feeder 2 is arranged on the belt drive in such a way that the stop 3 is offset somewhat in the transport direction X from an apex R of the belt drive on the insertion area 15 in the transport direction X. 4, the stop position of the stop 3 (contact point K) is selected such that it lies in a plane perpendicular to the transport direction X, which in FIG. 4 is to the left of a line through the axes of rotation of the shaft 12 the first deflection roller 11 and the roller 5. It can thus be ensured that after the rocker 8 has been pivoted, the veneer strips 16 lie on the belt 10 with a predetermined length and can thus be safely transported from the belt drive to the transport device of the machine 1.

When the two inserted veneer strips 16 have been completely transported past the stop 3, the rocker 8 is brought back into the starting position shown in FIGS. 1 and 4 by means of the actuating element 9, which can be operated, for example, pneumatically or hydraulically. This can either be done manually by the operator or a sensor can be detected when the veneer strips 16 pass the stop 3. have been transported. Thus, immediately after the implementation of two veneer strips 16 and a resetting of the stop 3, two new veneer strips 16 can be immediately inserted and transported further via the belt drive, so that the cycle times for the production of composite veneers in comparison with the prior art can be significantly reduced. Since the belt drive is also driven by the transport device of the veneer splicing machine 1, no separate drive or an expensive coupling for the feed 2 is necessary. As a result, the manufacturing costs for the collection according to the invention can be kept very low. Furthermore, installation space on the veneer splicing machine can be saved.

A toothed belt can be used for the belt 10 of the belt drive, which e.g. is made of plastic. Furthermore, it can be provided that, as soon as the inserted veneer strips 16 are transported further by the transport chains 19, 21, the first stop element 4 is moved upwards in order to keep the frictional resistance when feeding the veneers as low as possible and not to pull the veneer strips into the transport chains to hinder. This also prevents tension and dents in the veneer strips. Furthermore, it should be noted that the sensor, which detects the stop position of the veneer strips 16 at the stop 3, can also be used to detect when the rear edge of the veneer strips 16 passes the sensor and then then the stop 3 back into its starting position bring to.

A veneer splicing machine 1 according to a second exemplary embodiment of the present invention is described below with reference to FIGS. 7 to 10. The same or functionally the same parts are denoted by the same reference numerals as in the first embodiment. In contrast to the first embodiment, no rocker is provided in the feeder 2 according to the second embodiment. The stop 3 of the second embodiment consists of a first stop element 4 and a second stop element 27. The second stop element 27 is an essentially U-shaped element 28, which has an inclined surface 28a on each of the two legs. The surface 28a is again inclined relative to the transport direction X (see FIG. 7). Furthermore, the second stop element 27 comprises an actuating element 29. As indicated by the arrows in FIGS. 7 and 9, the second stop element 27 is not pivoted as in the first exemplary embodiment, but is moved vertically.

The starting position is shown in FIG. 7, in which the first stop element 4 and the second stop element of the stop 3 touch and provide the tapered stop for the veneer strips 16. In Fig.

9 shows the second position (passage position) of the stop 3, in which the second stop element 27 has been lowered in the vertical direction, so that a passage is formed between the first stop element 4 and the second stop element 27. The veneer strips 16 are pressed onto the belt by means of the first stop element 4

10 retracted and transported to the transport device 19, 21 of the machine, the roller 5 constantly exerting pressure on the veneer strips.

Otherwise, the function of the feeder 2 according to the second embodiment corresponds to that of the first embodiment, so that reference can be made to the description given there.

Claims

Expectations

A device for pulling veneer strips (16) into a veneer splicing machine (1) comprising: a belt drive comprising a belt (10), which runs between an insertion area (15) for the veneer strips (16) and a transport device (19, 21) of the veneer splicing machine (1) is arranged, and a stop device (3) which forms a stop for the inserted veneer strips (16), the stop device (3) from an apex (R) of the belt drive on the insertion area (15) in the transport direction (X) of the Belt drive is somewhat spaced,

- ^• The stop device (3) comprises a first stop element (4), which is arranged above the belt (10), and a second stop element (7; 27), which is arranged on the side of the belt (10), and wherein second stop element (7; 27) between a first position in which it is arranged slightly above the belt (10) and provides the stop, and a second position in which it is arranged below the belt (10) and a passage between the provides first and second stop element (3), can be moved back and forth.

2. Device according to claim 1, characterized in that the second stop element (7; 27) has an inclined surface (8a; 28a).

3. Device according to one of the preceding claims, characterized in that the second stop element (7; 27) is arranged on both sides of the belt (10).

4. The device according to claim 3, characterized in that the second stop element (7) is designed as a U-shaped rocker (8) with inclined end faces (8a) or that the second stop element (27) as a U-shaped element (28) inclined end faces (28a) is formed.

5. Device according to one of the preceding claims, characterized in that the first stop element (4) has a roller (5).

6. The device according to claim 5, characterized in that the roller (5) is loaded with an additional force.

7. The device according to claim 5 or 6, characterized in that a contact point (K) of the stop device (3) in a plane perpendicular to the transport direction (X) through a pivot point of the roller (5) or from the plane perpendicular to the transport direction (X ) by the pivot point of the roller (5) in the transport direction (X).

8. Device according to one of the preceding claims, characterized by a separating web (18), on the two sides of which veneer strips (16) can be applied.

9. Device according to one of the preceding claims, characterized by at least one feed roller (17a, 17b) which is inclined to the transport direction (X) of the veneers.

10. Device according to one of the preceding claims, characterized in that the belt drive is driven via a shaft (14) of the transport device (19) of the veneer splicing machine.

11. The device according to claim 10, characterized in that a deflection roller (13) of the belt drive between two drive wheels (20a, 20b) of the transport device (19) is arranged on a common shaft (14).

12. Device according to one of the preceding claims, characterized by a sensor in order to be able to detect a stop position of the veneer strips (16) on the stop device (3) and / or to completely retract the veneer strips (16) into the veneer splicing machine (1) to capture.