Woodworking – Bark rosser – Tree climber
Patent
1988-09-27
1990-07-31
Bray, W. Donald
Woodworking
Bark rosser
Tree climber
144208R, 144342, B27L 100
Patent
active
049443380
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a barking method, and a device for utilization of the method.
It is previously known to perform barking of a log while the log is made subject to a linear displacement movement through and past a barking apparatus. As examples of such barking methods can be mentioned barking using barking means such as a chain, wire or similar device, which is brought to take up frictional contact against the log to be barked, as for example as disclosed in Swedish Patent SE 122 987, SE 124 273, SE 130 000, SE 139 367 or SE 145 114, and with necessary contact force being obtained by means of one or a number of spring members. An alternative embodiment, including a triangular link system carrying a barking knife and with springs causing contact pressure, and including a motor driven drive means, is disclosed in CH 233 629, as a complete unit intended to perform a rotary movement along a tree, thereby performing a surrounding barking operation by means of the barking knife.
Previously known methods do not facilitate adjustment of the removal capacity during the barking operation, since the contact pressure of the barking member against a log is entirely related to the force applied by the springs used. An ideally suited barking method should allow for such a continuous adjustment of the removal capacity, which should be related to the type of log, but also the existing season of the year, since barking can be performed with less contact pressure at higher temperature (summer time) than at a lower temperature (winter time). The spring members are also less suited for location within a barking unit, since small bark fragments can be located between adjacent turns in the springs, and thus completely change a predetermined contact pressure for the spring loaded barking members.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to disclose a barking method, and an apparatus for utilization of the method, offering the possibility to continuously change the barking depth during operation, without changing the feeding speed of the log, and also removing the problems of changes in contact pressure related to previously known spring loaded barking member. Furthermore, the present invention also makes it possible to perform barking with a barking unit having an extremely uncomplicated design, having high dependability in operation, low manufacturing costs, and requiring a minimum of maintenance.
The method according to the present invention comprises causing a log during a substantially linear feed movement to pass one or a number of barking means, arranged to perform a surrounding and rotary movement in relation to the log, and it is mainly characterized in that the barking means by influence from centrifugal force during the surrounding and rotary movement in relation to the log are pressed against the log, and that the contact pressure of the barking means is continuously variable by an increase/decrease of the rotary speed for the barking means in relation to the log.
The apparatus for utilization of the method according to the invention includes a rotary member through which a log is arranged to pass during a linear feed movement in the longitudinal direction of the log, the rotary member being arranged to support barking means, arranged to debark a log by means of frictional contact or a cutting operation, and it is mainly characterized in that the barking means are arranged attached or joined with means which under influence of centrifugal force press the barking means with a contact pressure related to the rotary speed of the rotary member.
BRIEF DESCRIPTION OF THE DRAWINGS
A number of non-restricting examples of embodiments of an apparatus for utilization of the method according to the present invention are more fully described below with reference to the accompanying drawings, wherein
FIG. 1 is a cross-sectional view of a first embodiment of an apparatus for utilization of the method according to the invention;
FIG. 2 is a view substantial
REFERENCES:
patent: 2775274 (1956-12-01), Andersson
patent: 3098512 (1963-07-01), Kendrick
patent: 4425951 (1984-01-01), Pousette et al.
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