Raute Oyj

Jussi Puranen

Jarkko Hyttinen

Seppo Vartiainen

Antti Pennanen

Timo Kuivasto

Petteri Skofelt

Kari Sintonen

The invention concerns a method for peeling veneer from a log (). Veneer () is peeled tangentially from the circumferential surface of a log rotated around its longitudinal axis under conditions determined by the distance (knife gap) between the knife () and the nose bar pressing the surface of the log immediately in front of the cutting point. The peeling knife as well as the nose bar is moved towards the rotation axis of the log corresponding the proceeding of the peeling. At the ending stage of the peeling, the distance between the peeling knife and the nose bar is reduced substantially in accordance with the thickness of the veneer being peeled.

Method for cutting veneer from logs

The invention relates to a knife assembly for a veneer lathe, the knife assembly comprising heads having mounted therebetween a knife beam and a nose bar beam, the beams respectively supporting a peeling knife and a solid nose bar. The knife assembly is turnable about an axis of rotation aligned parallel to the longitudinal axis of the peeling knife and the nose bar, whereby the angular position of the knife assembly relative to the lathe carriage heads is adapted to change about this axis of rotation in compliance with the progress of veneer peeling. In the knife assembly, the angular position of the nose bar relative to the peeling knife is adapted changeable during peeling in order to control the angle between the nose bar and the peeling knife.

Knife assembly for a veneer lathe

The invention relates to a veneer lathe knife assembly comprising supported by a frame assembly a knife mounting beam ( ) and a nose bar beam ( ), both of which having a front portion ( ) for holding a cutting knife ( ) and a nose bar ( ), respectively, and a stiffening rear portion. The knife mounting beam ( ) and the nose bar beam ( ) are adapted movable relative to each other on the frame assembly so as to permit adjustment of the knife gap formed between the cutting knife ( ) and the nose bar ( ). Heat transfer means ( ) are adapted to the stiffening rear portion of both the knife mounting beam ( ) and the nose bar beam ( ). Both the knife mounting beam ( ) and the nose bar beam ( ) have placed thereon, in a close vicinity to the knife ( ) and the nose bar ( ), at least one first set of temperature sensors ( ) disposed in predetermined positions along the length of the knife and the nose bar. Furthermore, both the knife mounting beam ( ) and the nose bar beam ( ) have placed thereon, at a distance from the knife ( ) and the nose bar ( ), at least one second set of temperature sensors ( ) disposed in predetermined positions along the length of the knife and the nose bar, whereby the heat transfer means ( ) placed in the stiffening rear portion ( ) of both the knife mounting beam ( ) and the nose bar beam ( ) are adapted controllable for adjusting the respective portions of the knife mounting beam and the nose bar beam under feedback from the second set of temperature sensors to a temperature value derived from the measurement signal given by the first set of temperature sensors.

Knife assembly for veneer lathe

A veneer lathe knife assembly includes a lower portion supporting a veneer cutting knife, and a upper portion supporting a backing nose bar. The upper portion includes adjustment screws, for example, for adjusting a position of the nose bar in the upper portion of the assembly. To perform a fine adjustment of the knife gap formed between the cutting knife and the nose bar, the adjustment screws are individually temperature controlled to compensate for a thermal expansion of the adjustment screws, thus maintaining the knife gap along the length of the knife assembly.

Veneer lathe knife assembly

The present invention relates to a method for determining the starting point of rounding turning in the turning of veneer. For turning a log, the knife carriage of the lathe is withdrawn into a home position before starting the turning of a new log and, during the initial phase of turning, the knife carriage is driven from the home position forward into the starting position of rounding turning at a fast rate. During the initial turning phase, the intensity of knife carriage vibration is monitored and the thus obtained intensity value of knife carriage vibration is used in the determination of the initial position of the log rounding phase.

Method for determining the point to start rounding in the turning of veneer

An apparatus for controlled sorting of sheet-like objects such as veneer sheets in a desired manner onto different paths of travel includes a transport conveyor formed by parallel-traveling, spaced-apart moving transport conveyor elements, such as belts, and further includes a deflecting conveyor traveling locally at least over a certain distance substantially parallel to the transport conveyor. Operating in conjunction with the transport conveyor, rotary elements are adapted so that, in a controlled manner, they can reach upward via the gaps arranged between the transport conveyor elements to lift the veneer sheets. The rotary elements are elevated so as to rest against the deflecting conveyor, and are simultaneously movable in a direction synchronized to the movement of the deflecting conveyor.

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Lahti, Finland

Jussi Puranen