Abstract: A rotor for a permanent magnet machine includes first and second axially successive rotor sections each including permanent magnets generating magnetic field having a pole pitch. The rotor includes a first coupling system for connecting the first rotor section to a shaft and a second coupling system for connecting the second rotor section to the shaft or to the first rotor section. The second rotor section is rotatable with respect to the first rotor section by an angle corresponding to the pole pitch in response to releasing the second coupling system so as to set the stator flux-linkages generated by the first and second rotor sections to be substantially zeroes. Thereafter, the permanent magnets do not substantially induce voltages on the stator windings even if the rotor is rotating during for example an internal fault of stator windings.

Abstract: A rotor for a permanent magnet machine includes first and second axially successive rotor sections each including permanent magnets generating magnetic field having a pole pitch. The rotor includes a first coupling system for connecting the first rotor section to a shaft and a second coupling system for connecting the second rotor section to the shaft or to the first rotor section. The second rotor section is rotatable with respect to the first rotor section by an angle corresponding to the pole pitch in response to releasing the second coupling system so as to set the stator flux-linkages generated by the first and second rotor sections to be substantially zeroes. Thereafter, the permanent magnets do not substantially induce voltages on the stator windings even if the rotor is rotating during for example an internal fault of stator windings.

Abstract: The invention concerns a method for peeling veneer from a log (2). Veneer (4) 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 (3) 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.

Abstract: The invention concerns a method for recovering partial sized veneer sheets in the veneer production. A veneer sheeting peeled from a log is monitored with a machine vision device for detecting and localizing defects and defining corresponding partial sized sheet sections in the veneer sheeting. The partial sized sections of the veneer sheeting are evaluated for sound veneer in veneer lengths of a multiple of 2?+n?. The partial sized veneer sheets are cut as sound veneer sections in the longitudinal and transversal direction of the veneer sheeting controlled on the evaluation of value factors of the sections.

Abstract: The invention concerns a method for peeling veneer from a log (2). Veneer (4) 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 (3) 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.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a veneer lathe knife assembly comprising supported by a frame assembly a knife mounting beam (4) and a nose bar beam (5), both of which having a front portion (4′; 5′) for holding a cutting knife (6) and a nose bar (7), respectively, and a stiffening rear portion. The knife mounting beam (4) and the nose bar beam (5) 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 (6) and the nose bar (7). Heat transfer means (2, 2′, 2″, 2′″) are adapted to the stiffening rear portion of both the knife mounting beam (4) and the nose bar beam (5). Both the knife mounting beam (4) and the nose bar beam (5) have placed thereon, in a close vicinity to the knife (6) and the nose bar (7), at least one first set of temperature sensors (3, 3′) disposed in predetermined positions along the length of the knife and the nose bar.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a veneer lathe knife assembly comprising supported by a frame assembly a knife mounting beam (4) and a nose bar beam (5), both of which having a front portion (4′; 5′) for holding a cutting knife (6) and a nose bar (7), respectively, and a stiffening rear portion. The knife mounting beam (4) and the nose bar beam (5) 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 (6) and the nose bar (7). Heat transfer means (2, 2′, 2″, 2′″) are adapted to the stiffening rear portion of both the knife mounting beam (4) and the nose bar beam (5). Both the knife mounting beam (4) and the nose bar beam (5) have placed thereon, in a close vicinity to the knife (6) and the nose bar (7), at least one first set of temperature sensors (3, 3′) disposed in predetermined positions along the length of the knife and the nose bar.

Abstract: The invention relates to a veneer lathe knife assembly comprising a lower portion (5) supporting a veneer cutting knife (3) and a upper portion (2) supporting a backing nose bar (4), said upper portion including adjustment screw means (1 to 1″″) or the like devices for adjusting position of the nose bar (4) in the upper portion (2) of the assembly. To perform a fine adjustment of the knife gap formed between the cutting knife and the nose bar, the adjustment screw means are equipped with means (6) for controlling the temperature of the screw means.

Abstract: 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.