Abstract:
The invention relates to a method for forming a round log into a block with two or more flat lateral surfaces. IN the forming, the material to be removed is cut directly into chips in a block-forming assembly which comprises two or more working tools (3). Each of the working tools has the form of a rotary drum or frustoconical body, which on its circumferential surface carries a plurality of chipper knives (4). After the block-forming assembly, the block is fed to a sawing assembly for resawing, and when sawing thick logs the feed rate of the sawing assembly and, thus, also of the block-forming assembly must be reduced. According to the invention, the method comprises removing one or more chipper knives (4) from each of the working tools (3) when sawing thick logs. As a result, the reduction of the rotary speed of the working tools is avoided or limited, which is otherwise necessary to keep the desired chip size. The invention also concerns a blind knife (10) to be mounted in a chipper knife seat (11) instead of a removed chipper knife.
Abstract:
A knife for disk type chip cutter machines with a circular rotatable cutter disk (10) on its first axial side being provided with several knives running from the disk centre to its periphery. An opening (14) is provided in the disk in connection with each knife. The opening (14) has a chip guiding surface to guide separated chips to the other axial cutter disk side. The knife includes a knife carrier, on which the knife is fixed between a first carrier part (18) provided essentially in line with the first axial cutter disk surface and second carrier part (16) extending downwards in the opening from said cutter disk surface into the cutter disk inside and being a part of the chip guiding device. The knife (12) is on its side facing the other carrier part provided with a chip breaking surface (22) passing the other carrier part (16) into the opening and protecting said carrier part from wear in that the separated chips by means of the chip breaking surface are guided in a direction away from the carrier part.
Abstract:
The invention concerns a bark- cutting device to be fitted to a barking machine comprising a rotatable, annular rotor with many barking arms (2). The bark-cutting device fits the area of a barking arm's free end adjacent a barking edge's (6,6') upstream end, in the log feeding direction, and comprises a bark-cutting edge (8), with a longitudinal extent substantially transverse the log feeding direction for pre-cutting bark before debarking occurs. The bark-cutting device is an accessory element (9), comprising an internally threaded or unthreaded hole (10) or a threaded shank and a wing (11), extending laterally from the shank or hole and provided with the bark- cutting edge (8), so the device is adapted for use as a nut, washer or bolt and is connected to the barking tool when connecting the barking tool (4) to the barking arm (2). The invention also concerns a combination barking tool and bark- cutting device, and a method of fitting a bark- cutting device to a barking machine.
Abstract:
The invention relates to a chipper knife of thetype that is adapted to be mounted in chippers which have a rotatable tool, in the form of a disc, drum or frustoconical member, on which are mounted a plurality of such chipper knives to provide, during rotation of the tool and simultaneous feeding of pieces of wood to the same, material-cutting working or disintegrating of the pieces of wood into chips by means of at least one cutting edge (1, 1 '). At least a first side of the chipper knife has a raw, unworked surface or working stripes in the longitudinal direction of the chipper knife, that is substantially parallel to the cutting edge. This first side also has a thickened cutting edge portion (5, 5') in the area next to the cutting edge, which edge portion has working stripes in the transverse direction of the chipper knife, at an angle to the cutting edge. The invention also relates to a method of manufacturing such a chipper knife.
Abstract:
A method to control a manufacturing process for cellulose, pulp or similar by measuring the bulk density of the chips supplied to the process. A representative volume of the supplied chips are sampled and supplied to a measuring method, during which the sampled volume is measured as to the dimensions of the chips contained in the volume, the chip bulk density being possibly calculated by means of the measured values. The thus calculated chip bulk density is used to control the forthcoming chip treatment in the process.
Abstract:
An arrangement in wood chippers of the kind which includes a rotatable body, such as a disc, on which knives (12) are secured with the aid of knive holders (10). Mounted adjacent the knives and the knive holders are wear plates (24) which form a log guide surface which functions to guide the ends of a log to be chipped in a given relationship with the knive engaging the end of the log. When seen in the rotational direction of the chipper disc, the rear ends of the wear plates (24) are fastened to the chipper disc with the aid of means which enable the torsion of the wear plates to be changed. This torsion adjustment means includes camming devices (26) which abut the undersurface of the wear plate and which can be displaced in the radial direction of the disc. The rear ends of the wear plates are secured to the disc by means of fastener devices (50) which can be relieved of load in a manner such as to enable the camming devices (26) to be displaced relative to the wear plate (24) when no load acts thereon. On the other hand, the wear plates and camming devices are locked in their set positions when the fastening devices (50) are in a loaded state.
Abstract:
A wood working knife for use in a wood working machine, comprising a knife body having a first cutting edge and an opposed second cutting edge, the knife body having a first clamping surface and a second clamping surface. The first clamping surface has opposed clamping features separated by a middle section, the opposed clamping features and the middle section being sized and shaped such that, upon the knife body being inserted into a clamping assembly, the clamping forces are localized towards the opposed cutting edges and away from the middle section.
Abstract:
The invention relates to a chipper knife with at least one cutting edge (6) along at least one of its side edges. The chipper knife is adapted to be mounted in chippers of the kind which are used to cut chips of a desired size and shape from pieces of wood or timber (7) and which comprise a tool, in the form of a plane or conical disc, which is arranged for rotation about an axis of rotation and on which a plurality of such chipper knifes (2) are mountable in such manner that one end of the cutting edge of the chipper knife is located closer to the axis of rotation of the tool than the opposite end of the cutting edge. The cutting edge (6) of the chipper knife is formed between a timber-guiding surface and a chip-guiding surface, the timber-guiding surface having a varying angle along its length in relation to a plane of rotation in such a way that the angle is greater at the end of the cutting edge located closest to the axis of rotation decreases in the outward direction. The chip-guiding surface of the chipper knife also has a varying angle along its length in relation to a plane of rotation in such a way that the angle is smaller at the end of the cutting edge located closest to the axis of rotation and increases in the outward direction in order to obtain a cutting edge angle between the timber-guiding surface and the chip-guiding surface (13) that is essentially constant along the whole length of the cutting edge.
Abstract:
A wood processing device having a spinning wood processing head (10) having one or more spaced apart knives (18,20) mounted on said spinning head for processing wood. The knives, upon contacting said wood, form a curved cut surface in said wood being processed. At least one limit surface (21) is adjustably mounted between said one or more knives on said spinning head, said limit surface being sized and shaped to limit abnormal movement of said wood during processing. An adjustor (33) for adjusting a position of said limit surface (21) is provided to permit said limit surface to limit abnormal movement of said wood over a range of operating conditions. In a preferred embodiment the limiter is curved. A method of adjusting a wood processing head is also disclosed.
Abstract:
A wood processing device having a spinning wood processing head (10) having one or more spaced apart knives (18,20) mounted on said spinning head for processing wood. The knives, upon contacting said wood, form a curved cut surface in said wood being processed. At least one limit surface (21) is adjustably mounted between said one or more knives on said spinning head, said limit surface being sized and shaped to limit abnormal movement of said wood during processing. An adjustor (33) for adjusting a position of said limit surface (21) is provided to permit said limit surface to limit abnormal movement of said wood over a range of operating conditions. In a preferred embodiment the limiter is curved. A method of adjusting a wood processing head is also disclosed.