Woodworking – Process – Timber harvesting or processing
Patent
1988-09-27
1990-02-06
Bray, W. Donald
Woodworking
Process
Timber harvesting or processing
144 2Z, 144 3R, 144208E, 144343, 144335, B27L 300, B27L 1100, B27L 100
Patent
active
048982210
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This U.S. application stems from PCT International Application No. PCT/SE87/00155 filed Mar. 25, 1987.
BACKGROUND OF THE INVENTION
The present invention relates to a method for limbing, barking and chipping logs in a preferably mobile unit, and a device for utilization of the method.
For example, a previously known device is disclosed in U.S. Pat. No. 3,653,417 for removal of limbs and debarking, including a barking unit having a number of pivotally attached barking knives, each one being associated with an hydraulic cylinder by means of which the barking knives can be pressed against a log, and also including a conical member supporting a number of cutters, which when rotated act as a milling cutter, and thus cuts or mills away existing branches from the log. This device is located in an intermediate position between two conveyor belts, which are used to impose a linear movement for the log through the device. A further example of a previously known device is disclosed in SE Patent No. 398 612, intended to remove branches from a log, and chip the removed branches. The log is fed with the larger end portion as a first end portion, and the branches are pressed in direction towards the top of the log and removed, whereafter the branches by means of a conveyor belt are moved to a chipper. It is also proposed that the top of the log is cut off, and moved together with the branches to the chipper. Limbing and barking of the log is performed by means of a rotary limb removing drum, at one end portion having limb cutting and bark removing means peripherally arranged, which by means of a strong rubber band or similar means are pressed against the peripheral portion of the log. These previously known devices are not suitable when, for example, logging in small-tree forests, as when performing thinning, and when relatively small diameter logs are to be transformed into chips.
SUMMARY OF THE INVENTION
The present invention discloses a method for limbing, barking and chipping logs as continously following operations, as well as a mobile unit for utilization of the method, and it is particularly well suited for small diameter logs, as obtained during a thinning operation. Adjustment between manufacture of industrial chippings, having a minimal content of bark, and chippings for energy purposes, having a larger content of bark, is also easily performed, as well as adjustment of the barking capacity to the type of trees being processed, and existing variations caused by the actual time of year when barking is performed. The method according to the present invention can be utilized in a machine having a simple technical design, which results in dependable operation and low manufacturing and maintenance costs.
The method according to the present invention makes it possible to perform barking and/or limbing and chipping as a continous operation, an d is based on the steps that a log means of two displacable feed rollers is given a linear displacement movement in direction towards a chipper, and that at least two knife-like means are pressed against the peripheral surface of the log in a step preceeding the feed rollers, the knife-like means being displacable in relation to each other in a substantially crosswisely extending plane in relation to the longitudinal and displacement direction for the log, and which during the linear feeding movement of the log shear or cut off existing branches, and when performing barking, the feed rollers being followed by a rotary barking unit surrounding the log, including a number of barking means having members arranged to take up contact with the peripheral surface of the log, which by means of centrifugal force during a rotary movement in a plane different from the feeding direction of the log are pressed against the peripheral surface of the log, and by means of a cutting or frictional contact operation remove a layer of bark surrounding the log.
The device of utilization of the method according to the present invention includes a vehicle
REFERENCES:
patent: 3308861 (1967-03-01), Hamilton
patent: 3533458 (1970-10-01), McCall
patent: 3809134 (1974-05-01), McCabe
patent: 3955765 (1976-05-01), Gaitten
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