Woodworking – Feeder or presser – Feed roll
Patent
1998-01-06
1999-08-31
Bray, W. Donald
Woodworking
Feeder or presser
Feed roll
1442081, 1442461, 1442487, 198624, B27C 112, B27B 3100
Patent
active
059440783
DESCRIPTION:
BRIEF SUMMARY
The invention relates to feeding roller for a log feeding device of a debarking machine, said feeding roller comprising a substantially drum-like body and a rib formation consisting of ribs positioned at intervals on the circumference of said body, whereby the ribs are provided in separate rib elements to be secured to the body, and whereby a plurality of rib elements mounted one after the other around the circumference of the body provides said rib formation.
In debarking machines where the log to be debarked is centred according to the centre of a fixed rotor, the purpose of feeding devices is to provide the necessary force for feeding the log through the rotor, to centre the log in lateral and vertical direction on the rotation axis of the rotor, and to control the forces which are generated as a result of the debarking and which tend to rotate the log. The purpose of a feeding roller of a feeding device is thus to both feed and centre logs of various tree species under various conditions.
The feeding rollers previously used in rotor-type debarking machines have been spiked rollers, ribbed rollers and combinations thereof.
The known spiked roller constructions consist of two or more spiked feeding rollers comprising a cylindrical body and a sufficient number of conical spikes welded to the outer mantle surface of the body. The rollers are connected to each other by a lever mechanism which controls the movement of the rollers so that the log to be debarked is fed to the centre of the rotor.
The known ribbed roller constructions consist of two ribbed feeding rollers comprising either a cylindrical body to which wedge-shaped ribs are welded or a double-cone-shaped body to which ribs of equal height are welded. The double-cone shape of the rollers allows the log to be guided in lateral direction towards the centre of the rotor. The rollers are connected to each other by a lever mechanism which controls the movement of the rollers so that the log to be fed is guided in vertical direction towards the centre of the rotor.
In the known solutions, the feeding rollers on both sides of the rotor of a debarking machine are similar in construction, and the need for different gripping forces is attended to, for example, by adjusting the pressure in a hydraulic cylinder connected to the lever mechanism of the roller construction.
In addition, in the known solutions, identical feeding rollers are used for debarking different tree species and in different conditions, such as summer and winter debarking. The unequal feeding forces and anti-rotation forces required in different conditions are provided, for example, by adjusting the pressure in a hydraulic cylinder connected to the mechanism.
PCT publication WO 95/01856 discloses a construction in which separate slip-stops are mounted by chains successively on the circumference of a rubber drive wheel. The purpose of the slip-stops is to enhance the gripping of the drive wheel to the tree trunk to be transferred. The slip-stops are all identical in shape.
In rotor debarking, it is essential to the result how much the surface of the log to be debarked is damaged by the spiked or ribbed rollers of the feeding devices. In the known devices it is possible, in practice, to adjust only the pressure exerted by the rollers on the surface of the log; the surface of the log is therefore always damaged to some extent when identical rollers are used for different tree species and under different conditions. In practice, this drawback can be avoided to some extent by blunting or sharpening the fixed ribs. If such a method of adjustment is used, the rollers are naturally subjected to wear more than usual, which makes it necessary to change the rollers after a shorter period of use.
A further problem with the existing ribbed roller constructions where the ribs are made of plate profiles is that the gaps between the ribs are filled with bark and wood, which reduces the gripping force of the rollers, wherefore the use of unnecessarily high compression pressures is required.
The object of t
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patent: 5111860 (1992-05-01), Wingate-Hill et al.
patent: 5797438 (1998-08-01), Dye
Bray W. Donald
Valon Kone Oy
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