FI79052B - MASKIN FOER AVLAEGSNING AV ROTFOERTJOCKNINGAR. - Google Patents

Description

1 79052

Tyvensievennyslaite

The present invention relates to a bottom relief device according to the preamble of claim 1.

Numerous different devices are known in the art for removing thick base parts from supports before they are taken for sawing. A device such as that set out in the specification of the main claim is known from NO patent application 783 582 (NO patent 149 340). In this device, the entire log must be supported and lifted from the conveyor and at the same time rotated by the milling unit for machining. The holding and rotating devices must therefore have such a long support in the longitudinal direction of the log that the log does not rotate when it is lifted, i.e. at least two support points at a sufficient distance from each other must exist. The milling unit is then pressed upwards towards the underside of the base of the log protruding freely from the holding and rotating devices, and as the log rotates the thick base is milled off, after which the milling unit and holding and rotating device are lowered and lowered back to the conveyor for further transport. The new log is then fed into the machine and a visual or automatic inspection determines if a new log needs to be milled and whether the machine needs to be started to remove the thick section from the base.

It is an object of the present invention to provide a device of this type in which the holding and rotating device is simplified and is substantially shorter than in the known device.

This is achieved according to the invention by the features set forth in the features of independent claim 1, as well as by the features set forth in the features of the following dependent claims.

In the device according to the invention, the combined holding and rotating device comprises raising the upper and lower pairs of discs to raise, rotate and rotate the log 2 79052, the pair of discs gripping the log as close as possible to the base of the log and the milling unit resting on the top of the log. distance limiters from the holding device. These side guides can be obtained by shaping the conveyor into a V-shape or by arranging upwardly projecting side walls or arms which ensure that the end of the log does not twist transversely away from the conveyor during rotation.

Since the log is supported as far apart as possible during rotation and milling, the rotational or lever movement at the base of the log will be less than if the log had been supported at two points closer to each other, e.g. in the middle of the log. Thus, the milling head removes relatively less wood from the thick base portion due to less cranking effect.

The device is simple to install and has a short construction length, which makes the device easy to apply to existing kola conveyors. It can also be easily installed on inclined co-conveyors, as the device does not have to stand horizontally. Due to the fact that the milling unit is placed so high that it processes the log from above, there is enough space for wood chips and equipment to remove them in the area below the milling unit and the base end of the log.

In a preferred embodiment, the holding device allows the logs to be fed either transversely or longitudinally into the device. This allows the device to be flexibly placed in either new hardware or existing systems.

The invention will now be described in more detail by means of an exemplary embodiment with reference to the accompanying drawings, in which Figure 1 shows an inlet end of a device according to the invention, Fig. 2 shows a side view of the device, and Fig. 3 is a schematic side view of the main parts of the device. for milling.

The base relief device comprises a combined holding and rotating device 1 for receiving and lifting the log 3 from the conveyor 2, the device being mounted at the path of the conveyor. The base end 3 'of the log 3 protrudes from the holding device 1, which also rotates the log 3. The milling unit 4 adapted to be raised and lowered is located next to the holding device 1, its axis of rotation projecting in the longitudinal direction of the log 3. The holding / rotating device comprises an upper member 1a and a lower member Ib, and at least the lower member Ib is adapted to be raised and lowered to raise the base end 3 'of the log 3 in contact with the upper member 1a, in which position the log 3 is rotated and milled by a milling unit 4 the top end 3 ”of the log, located further in the transport direction, remains supported by the conveyor 2. In the example shown (Fig. 1), the conveyor 2 is shaped with a V-shaped cross-section which prevents the top end 3 "of the log from rotating away from the conveyor as the log rotates while the thick base part is milled away.

The lower holding member Ib is located in the longitudinal direction of the device between the upper holding member Ib and the milling head 4. Thus, the log 3 is in an inclined position at the base end 3 'in the holding members 1a, Ib with the conveyor supporting the top end 3 ".

In the described embodiment, each holding member 1a, Ib can be raised and lowered relative to each other, while the holding / rotating device 1 as a unit can be raised and lowered as mentioned above. This is achieved in that the upper and lower holding members 1a, 1b are supported on different arms 7, 8, each of which can be raised and lowered by means of the drive devices 5, 6. Both arms 7, 8 are pivotally mounted on the frame 9, and the lower arm 7 is adapted to be raised to the desired height 4 79052, regardless of the movements of the upper arm 8. The actuators 5, 6 are pressure cylinders, i.e. the pressure cylinder 5 is arranged between the lower arm 7 and the frame 9 to raise and lower the holding / rotating device 1, and the pressure cylinder 6 is arranged between the two arms 7, 8 to pivot these arms and the upper and lower holding members supported therein. 1a, Ib in contact and rotational contact with the base end 3 'of the log (3).

The milling unit 4 is arranged on the arm 10, which is also pivotally mounted on the frame 9, and the pressure cylinder 11 is arranged between the milling unit arm 10 and the frame 9 to turn the milling unit 4 into contact with and out of the base 3 'of the log 3.

In order to limit the milling of the thick base part 3 'of the milling unit 4, an annular stopping device 4' is arranged at one end of the milling unit and is located at the end closest to the holding device 1. The diameter of the stopping device 4 'is equal to or larger than the diameter of the milling unit 4, so that when the stopping device 4' touches a part of the log having the same or smaller diameter as the milled base part 3 ', milling is further prevented by the stopping device touching the log surface.

For simplicity, the drawing does not show the pressure medium connections of the pressure cylinders 5, 6 and 11 or their control table. The device can be started and operated manually, but more preferably it is done automatically by sensor devices known per se, which may be electronic and / or mechanical or optionally optical, and transmits signals to the drive control table and automatically starts and stops the cylinders depending on the conveyor 2 passing through the device. the outer form.

While the base end 3 'of the passing log 3 is detected and consequently the holding / rotating device 1 is actuated to raise and rotate the log 3 and mill the thick root portion of the base end 3', the part of the conveyor 2 which guides the logs 3

II

5 79052 to be stopped or delayed in order to prevent the next log from entering the device before the milling of the base end of the previous log has been completed and the previous log 3 has been lowered onto the conveyor 2 and transported forward.

As mentioned above, the device can be used in conjunction with an existing conveyor or timber cola conveyor in which logs pass longitudinally through the device.

In addition to the embodiment of the device described in the drawings, the logs 3 can also be introduced transversely into the device, where they are then held and milled before being transported out of the device in the longitudinal direction.

In this way, numerous different installation combinations are provided, either to save space or to adapt the system to site conditions.

Figure 1 shows a motor 12 mounted on the arm 10 of a milling unit 4, the motor drive wheel of which is connected to a corresponding wheel 4 'in the milling unit 4 via a V-belt or chain 12'.

The holding members 1a, Ib in the holding and rotating device 1 may e.g. consist of two discs which are brought into contact with the upper and lower surface of the log 3 to hold and rotate the log when the arms 7, 8 are turned towards each other to hold and rotate the log and lift the log from the conveyor 2. or each pair of discs can be powered by a motor to rotate the log, but in the example shown in Figure 1 only one motor 13 is shown on the lower arm 7, with a belt or chain drive connected to the rollers for rotating them.

The rollers shown in the holding members 1a, 1b are one way of forming these members, but other shapes can be used which are suitable for holding and rotating the log 3 without departing from the scope of the present invention.

Claims (4)

6 79052 A bottom relief device, i.e. a machine for removing thickenings of the base parts of logs, said bottom relief device comprising a conveyor (2) and a combined holding and rotating device (1), the combined holding and rotating device (1) comprising holding members and pressing members between which the logs (3) are rotated so that the base end (3 ') of the log remains free outside the holding and rotating device (1), the base relief device further comprising a milling head (4) located in the vicinity of the holding and rotating device (1), which is vertically movable and has an axis substantially longitudinally, characterized in that the lower holding member (Ib) can be raised to bring the base (3 ') of the log (3) into contact with the upper holding member (1a), the top end (3 ") of the log (3) being supported by a conveyor with a limiter member preventing lateral movement of the log end (2), and wherein the log (3) is rotated by a holding and rotating device (1) with the log in an inclined position on the milling head (4) for continuous machining. Device according to Claim 1, characterized in that the lower holding element (Ib) is located in the longitudinal direction of the device between the upper holding element (1a) and the milling head (4). Device according to Claim 1 or 2, characterized in that the holding elements (1a, Ib) are supported substantially by arms (7, 8) which can be pivoted about the longitudinal axes of the device, with a lower holding arm (7) and a device body (9). an actuator (5) for setting the holding member (Ib) to the desired height, and a second actuator (6) is arranged between each arm (7, 8) for pivoting the upper holding member (1a) into rotational contact against the log. Device according to one of the preceding claims, characterized in that an annular stop device (4 ') with a radius equal to or greater than the radius of the milling head (4) is located at the end of the milling head (4) on the side of the holding and rotating device (1). Il