FI112616B - Process for branching as well as wood finishing units for this - Google Patents

Description

112616

The present invention relates to a pruning method using a wood treating device, as well as to a device for that purpose according to the preamble of claims 1 and 6.

In the treatment of wood, pruning of tree trunks accounts for a large part of the wood processing time and various methods have been disclosed, partly to simplify pruning devices and to make them cheaper and partly to make pruning faster.

From Swedish Announcements 315 384 and 8107739-8, it is known to use pruning blades which reciprocate in the longitudinal direction of the body to remove thicker branches from the body by striking or pushing. According to the first-mentioned publication, a rotating eccentric 20 is used which, by hitting, adheres to the pruning knife when it is pushed against the eccentric due to the resistance of the larger branches. The pusher used operates continuously, for example, at a stroke rate of 50 beats per second.

Due to the cooperation of high frequency impact surfaces • '25, the device is sensitive to malfunctions and; · *: shocks in addition to the device itself; prevent the tree trunk from moving relative to the feeder; and even stops or cancels the device.

Another device according to another publication utilizes hydraulic drive, working pruning blades which are pushed quickly and forcefully against the movement of the frame through the device. To prevent the trunks from pushing the blades to pruning,; would move against the feed direction, retaining means are arranged to hold the tree trunk when detaching larger branches, i.e.. when pruning, the forward movement of the frame must be stopped. The device is thus slow. Further, the hydraulic means for moving the pruning blades 112616 2 engage the blades at a location separate from their bearing shafts. This involves a space-consuming construction.

It is an object of the present invention to eliminate the disadvantages of known pruning machines while increasing the pruning rate and thereby reducing the total time of wood treatment. This is possible so that the invention has the characteristics set forth in the claims.

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The invention will be described in more detail by way of example with reference to the drawing, which schematically shows a woodworking apparatus according to the invention in perspective.

The wood handling device comprises a stand 1 known per se, having two feed rollers 2 which engage the wood frame 3 on both sides to feed the frame forward during pruning. As noted in the drawing, the feed rollers are provided with chains to increase the gripping power of the run-20 wood. The device is intended to be mounted on the crane arm of a forestry machine by means of a coupling member 4. The base 1 is further provided with a cutting element 5 known per se to cut the tree trunk to suitable lengths. Reference number 6 characters-. ! 25 see a bundle of hydraulic hoses for driving the feed rollers 2, cutting devices 5, and, as described later, the pruning blades 7 by means of hydraulic fluid.

V · In the embodiment shown, the device further comprises a third pruning blade 8 known per se, which is fixed; '13 is mounted on a base 1 and by means of a compression spring 9: pressed towards the tree trunk 3.

The tree body 3 is held pressed against the base 1 by means of feed rollers 2 which have been slightly inclined for this purpose.

The corresponding pruning blade 7 is, by means of the bearing sleeve 10, pivotally mounted around a pivot pin mounted on a base 1 (the pivot pin is not shown). The shaft pin is tubular and the piston rod of the hydraulic cylinder 11 extends through the shaft pin and is secured to the bearing sleeve 10 of the pruning blade 7 at position 12. The hydraulic cylinder 11 is secured to the base 1. The bearing sleeve 10 and the pruning blade 7 The device is further provided with a pulse sensor 10 known per se for measuring the length of the tree trunk 3 in order to cut it into measured lengths. The pulse sensor operates in such a way that it senses the feed rate of the tree trunk 3. It is thus possible to use a pulse sensor to activate the pruning blades 7.

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When the pulse encoder senses a drop in the feed rate of the tree trunk, for example a fall below a predetermined rate value, the hydraulic cylinders 11 are automatically engaged to push the pruning blades out of the device, i.e.. against the direction of movement of the frame 20 3 and against the branches. This movement of the pruning blades 7 can take place at a specific frequency, for example 10-30 pulses / sec, whereby the blades are moved backwards by the movement of the branches in the direction of the tree trunk 3. The feed rollers 2 are always working at full: 25 feed power and almost constant feed rate, which means that the pruning process is fast and continuous; ; when feeding.

The retractable or retracting movement of the pruning blades 7 30 can also be achieved, for example, by means of tension springs which are mounted on the bearing sleeve 10, respectively, on the base. This is not shown. Dual acting piston-cylinder units can also be used for this purpose.

The movement of the pruning blades 7 from the device may take place simultaneously or alternately, i. when one blade is retracted, the other is pushed forward by a hydraulic .35 4 112616 racket.

The figure also shows the commonly occurring pruning knife 8, which is not movable in the direction of the body. However, in order to make the device 5 even more efficient, it is naturally possible within the scope of the invention to mount this pruning blade 8 reciprocating on the base 1 guide (not shown), whereby the pruning blade 8 can be displaced longitudinally by another hydro- as happens with pruning blades 7.

According to the invention there is provided a method for reliable and rapid pruning of tree trunks, even when these are difficult to prune, for example pine tops, certain hardwoods and the like. By operating the hydraulic piston in the bearing axis of the respective pruning blade, free space is provided for complementary devices, such as feed rollers, etc. Using a known, existing pulse sensor for automatically activating the pruning blades requires no sophisticated accessory or sensing technology. the body is fed continuously.

25 * 'A number of different details are drawn in the drawing, which, while essential to the operation of the device, do not have any bearing on the invention as such.

Claims (6)

1. A pruning method using a wood handling device, wherein the tree trunk is fed through the device by means of a feeder 5 and pruned by one or more pruning blades which are hydraulically actuated to move back and forth along the length of the wood frame, almost constant, whereby the pruning blades are activated when a change in the feed rate of the tree trunk is detected. A method according to claim 1, wherein multiple pruning blades are used, characterized in that the pruning blades are actuated alternately. The method of claim 1, wherein multiple pruning blades are used, characterized in that the pruning blades 20 are activated simultaneously. Method according to one of Claims 1 to 3, characterized in that the change in the feed rate of the wood frame is sensed by a pulse sensor, which is normally used for measuring the length of the wood frame. A method according to any one of the preceding claims, characterized in that the pruning blades are moved •. : at a frequency of 10-30 beats / s. ,: · '30 5, 112616 A wood handling device comprising a stand (1) supporting the feed rollers (2), one or more pruning blades (7) pivoting towards and away from the tree body (3), and a cutting device (5), wherein the pruning blades (7) ) are arranged to be moved by hydraulic force in the longitudinal direction of the wood frame (3), characterized in that it is reciprocating. for each pruning blade (7) is arranged to be displaced 112616 6 along a bearing shaft provided with a hydraulic cylinder-piston assembly (11) for actuating said pruning blade (7) in the longitudinal direction of the body (3) towards the branches, arranged to activate the cylinder-piston assembly (11) which moves the pruning blades (7). Patsntkrav 10