Edge processing device and edge processing method

Abstract

Edge processing device (1) for edge processing the narrow sides of plate-shaped workpieces (5) made of wood or wood substitutes with an edge strip (7), comprising a polishing unit (2) with at least one polishing wheel (21, 22) and a scraper device (3) with at least one scraper (31, 32) for machining the edge strip (7) applied to the workpiece (5) in a machining direction (X), characterized in that the edge processing device (1) has at least one roller (9) downstream of the scraper device (3) in the machining direction (X), which is arranged so close to the polishing wheel that a force transmission is exerted on a chip (8) produced by the scraper device (3) which enters the area between the at least one polishing wheel (21, 22) and the roller (9).

Description

[0001] The invention relates to an edge processing device according to the preamble of claim 1 and to an edge processing method.

[0002] When processing workpieces made of wood or wood substitutes, edge strips made of plastic or other materials are often attached to the narrow side of a corresponding sheet-shaped workpiece. A typical setup for an edge processing device in the finishing sector is shown in Fig. Figure 1 shows the machining direction in which the workpiece moves relative to the machining unit. Z denotes the vertical direction, perpendicular to the ground or perpendicular to the broad side of the workpiece. 5. For post-processing, see for example... Fig. 2, which make a cut along line BB through device 1 Fig. Figure 1 shows drawing units 3, which frequently have draw blades 31, 32, which serve to remove excess material from the already applied edge strip 7, forming a drawn chip 8. Such a device with a draw blade is also known, for example, from DE 42 17 589 A1, EP 1 834 744 A2, DE 10 2015 204 326 A1 or DE 10 2015 218 879 A1.

[0003] From DE 10 2018 100 934 A1, for example, it is known to crush the drawing chip immediately after the drawing process so that it is less likely to become trapped in the machine. DE 20 2019 101 455 U1 discloses a device for removing a long chip. This device has a suction nozzle that is part of a cutting device. The long chip is drawn into the cutting device by means of the suction device and cut there. From DE 10 2008 048 295 A1, an arrangement for removing a long chip is known that includes a blowing device which blows on the long chip produced by a drawknife and then cuts it off using a cutting device. The targeted blowing is intended to prevent uncontrolled cutting.

[0004] Following such a honing process, the workpiece 5 is usually polished using a polishing unit 2, which has one or more polishing wheels 21, 22, in particular so-called buffing wheels. Since the honing unit 3 and the polishing unit 2 are arranged one behind the other in the processing direction X of the workpiece 5, the free end of the honing chip 8 protrudes beyond the rear end of the workpiece 5, so that the honing chip 8 hangs uncontrollably on the edge strip 7. It can happen that the honing chip 8 becomes caught in the device 1; in particular, such honing chips 8 can wrap around the axes of rotation of the polishing wheels 21, 22. This can, for example, block the axis of rotation of the polishing wheels 21, 22. Of course, honing chips 8 can also become caught in other parts of the edge processing device 1 and lead to damage or blockages.

[0005] The object of the present invention is therefore to create an edge processing device and an edge processing method that help to avoid these disadvantages of uncontrolled drawing chips.

[0006] This problem is solved by an edge processing device with the features of claim 1, and an edge processing method with the features of claim 7. Advantageous embodiments are found in the dependent claims.

[0007] The edge processing device according to the invention is used for edgebanding the narrow sides of flat workpieces made of wood or wood substitutes with an edge band. Edge bands can be either individual strips of edge material or edge strips unwound from a roll. These are usually made of plastic, but other materials are also possible. The device according to the invention comprises a polishing unit with at least one polishing wheel and a scraper assembly with at least one scraper blade, positioned upstream of the polishing unit in one processing direction, for machining the edge band applied to the workpiece. When the edge band is applied, a chip is produced by scraping it with the scraper blade.To prevent the chip from hanging down uncontrollably, as described above, and potentially damaging parts of the edge processing device, the invention provides that the edge processing device has at least one roller positioned downstream of the drawing unit in the processing direction. According to the invention, this roller is arranged so close to the polishing wheel that a frictional connection is exerted on any chip produced by the scraper assembly that enters the area between the at least one polishing wheel and the roller. The combination of polishing wheel and roller thus serves to capture the freely hanging chip and clamp it between them. This clamping effect ensures that the chip is securely guided between the roller and the polishing wheel and, as a result of the clamping force, is removed from the applied edge strip in a controlled manner when the workpiece continues to move in the direction of travel.By removing the drawing chip in a controlled manner, impairments of the type described above are no longer possible.

[0008] The roller can preferably be arranged directly on the polishing unit. It is also possible to provide the roller as a component mounted separately from the polishing unit. Particularly in the latter case, retrofitting a roller according to the invention is easily possible, so that existing systems can be specifically improved by these measures.

[0009] It is possible for the roller to be rotatably mounted around an axis of rotation that is inclined to the axis of rotation of the polishing wheel. However, the axis of rotation of the polishing wheel and the axis of rotation of the roller may also not be parallel to each other.

[0010] It is particularly advantageous if the roller according to the invention is arranged such that its axially oriented end face is opposite the edge strip applied to the workpiece on its decorative side. For this purpose, it can be provided, in particular, that the axis of rotation of the roller is arranged vertically at the level of a workpiece transport support. In this way, the roller can be relatively small with respect to its diameter; in principle, it is sufficient, for example, if the roller has a diameter that corresponds approximately to the vertically measured height of the supplied plate-shaped workpiece. Due to the fact that the polishing wheel generally has a relatively flexible surface, sufficient frictional contact is still achieved between the polishing wheel and the cylindrical surface of the roller to pick up, hold, and tear off a chip that gets caught between the polishing wheel and the roller.

[0011] The roller can be driven, but this is not strictly necessary since the polishing wheel is driven. However, a driven roller allows for even better control of the forces acting on the drawing chip, as a specific rotational speed and, if necessary, direction of rotation can be set.

[0012] There are various ways to mount the roller and adjust the required frictional engagement with the polishing wheel. A preferred embodiment provides that the roller, particularly on a lever arm, is mounted in such a way that it is pressed against the at least one polishing wheel. This pressure can potentially be achieved via a spring and another preload mechanism. Such a preload mechanism can also be adjustable, allowing the device to be individually adjusted to the edge material, the thickness of the resulting chips, or similar factors.

[0013] In the edge processing method according to the invention, a workpiece described above is placed on a workpiece transport support and connected at one narrow side to an edge strip by means of an edge processing device described above. The edge strip is stripped in a certain area by means of at least one scraper blade, so that a chip is formed. According to the invention, this chip is gripped between the roller and the at least one polishing slide and separated from the rest of the edge strip as a result of the resulting frictional contact.

[0014] The invention is described below with reference to the Fig. 1, Fig. 2 to Fig. 3 explained in more detail. Fig. Figure 1 shows a side view of a part of an edge processing device according to the invention. Fig. Figure 2 shows a section along line BB. Fig. 1. Fig. Figure 3 shows a section along line AA. Fig. 1.

[0015] The basic structure of the edge processing device 1 according to the invention, as shown in the Fig. 1 and Fig. As shown in Figure 2, this has already been explained above. Therefore, the following discussion will primarily focus on the additional function of the roller according to the invention.

[0016] How to in Fig. As 2 recognizes, the scraper device 3 has at least one, preferably two, scrapers 31, 32, which are applied to the workpiece 5 in the area of ​​the edge strip 7. Due to the movement of the edge strip 7 or the workpiece 5 relative to the scraper 31, 32 in a processing direction X perpendicular to the vertical direction Z and transverse direction Y, the drawn chip 8 is produced. The workpiece 5, to which the edge strip 7 is attached, rests on a workpiece transport support 6, in particular a chain conveyor, and is held in place by an overpressure device 4 during transport through the edge processing device 1, so that it cannot slip on the workpiece transport support 6.

[0017] How to in Fig. Upon detection of the workpiece 5, which is transported further in the direction of movement X through the edge processing device 1, it reaches the polishing unit 2. At least one polishing wheel 21, 22 is located there. In the example shown, it is preferably provided that at least two polishing wheels 21, 22 are components of the polishing unit 2. These two polishing wheels 21, 22, with their driven axes of rotation in the vertical direction Z, are arranged above and below the workpiece and the edge strip 7, respectively. A roller 9, which is rotatably mounted about an axis D, faces the decorative side of the edge strip 7. This roller preferably rotates in the transverse direction Y (i.e.,(tapering conically away from the edge strip 7) lies, in the example shown, with its axis of rotation D approximately at the height of the narrow side of the workpiece 5, here in the immediate vicinity of the polishing wheel 21, preferably between two polishing wheels 21, 22, whose axes of rotation in the direction of movement X are preferably spaced apart from each other. As can be seen in . Fig.Upon detection of the workpiece 5 in the direction of movement X, the configuration ensures that the chip 8 enters the area between the polishing wheel 21 and the roller 9. This area or gap is preferably selected such that the chip 8 is clamped between the roller 9 and the polishing wheel 21 and thus held in place. With further feed of the workpiece 5 in the direction of movement X, this clamping ensures that the chip 8 is removed from the edge strip 7 remaining on the workpiece 5. The polishing wheel 21, 22 can rotate in the same direction as, or opposite to, the workpiece movement. The rotational speed of the polishing wheel 21, 22 can be decreased or increased depending on the feed rate of the workpiece 5. Preferably, the rotational speed of the polishing wheel 21, 22 is increased when the feed rate of the workpiece 5 increases, and decreased accordingly when the feed rate of the workpiece 5 decreases.Theoretically, it is also possible to synchronize the rotational speed of the polishing wheel 21, 22 with the feed rate of the workpiece 5 in such a way that no slippage occurs between the polishing wheel 21, 22 and the workpiece 5. However, for a better polishing effect, it is preferable that a certain amount of slippage is present.

[0018] The removal of the drawn chip 8 thus takes place in the area of ​​the roller 9 or polishing wheel 21, so that a correspondingly removed drawn chip 8 can be removed as reject material from the edge processing device 1 according to the invention in a controlled manner at precisely this point, without the risk of such chips becoming trapped in other parts of the device. For example, a suction device can extract the separated drawn chips.

Claims

[1] Edge processing device (1) for edge processing the narrow sides of plate-shaped workpieces (5) made of wood or wood substitutes with an edge strip (7), comprising a polishing unit (2) with at least one polishing wheel (21, 22) and a scraper device (3) with at least one scraper (31, 32) positioned upstream of the polishing unit (2) in a processing direction (X) for machining the edge strip (7) applied to the workpiece (5), characterized by , that the edge processing device (1) has at least one roller (9) downstream of the scraper device (3) in the processing direction (X), which is arranged so close to the polishing wheel that a force transmission is exerted on a chip (8) produced by the scraper device (3) which enters the area between the at least one polishing wheel (21, 22) and the roller (9). [2] Edge processing device (1) according to claim 1, characterized by, that the roller (9) is arranged on the polishing unit (2). [3] Edge processing device (1) according to claim 1 or 2, characterized by , that the roller (9) is rotatably mounted about an axis of rotation (D) which runs at an angle to the axis of rotation of the polishing wheel (21, 21). [4] Edge processing device (1) according to one of the preceding claims, characterized by , that the axis of rotation (D) of the roller (9) is arranged in a vertical direction (Z) at the level of a workpiece transport support (6). [5] Edge processing device (1) according to one of the preceding claims, characterized by , that the roller (9) is driven. [6] Edge processing device (1) according to one of the preceding claims, characterized by , that the roller (9) is mounted, in particular on a lever arm, in such a way that it is pressed against the at least one polishing wheel (21, 22). [7] Edge processing method in which a workpiece (5) is connected at one narrow side to an edge strip (7) by means of an edge processing device (1) according to one of the preceding claims lying on a workpiece transport support (6), wherein the edge strip is stripped in an area by means of the at least one scraper blade (31, 32) so that a chip (8) is formed, wherein the chip (8) is gripped between the roller (9) and the at least (21, 22) and is separated from the rest of the edge strip (7) as a result of the force-fit connection.

Images