Abstract: A laser marking device that irradiates a laser beam on a workpiece (W) to transform a portion inside the workpiece at a focal point of the laser beam, thus putting a dot in each predetermined area. The laser marking device includes acquiring mechanism (10, 20) that acquires, as information on the dot, at least two-dimensional position information of an exposed section of the workpiece (W), and density information of the dot, coordinate setting mechanism (30) that calculates, for each dot according to the density information, dot depth information showing the distance from the surface of the workpiece (W) to the dot in the thickness direction of the workpiece (W), and sets three-dimensional coordinates for each dot based on a position specified by the dot depth information and the two-dimensional position information, and laser marking mechanism (40) that performs marking with the three-dimensional coordinates as a laser beam focal point.

Abstract: It is judged whether a marking unit formed on a material becomes a bright mark or a dark mark. Based on this judgment, for the work W of a material in which the marking unit becomes a bright mark, the code symbol of the 2-dimensional code of the original image is bright/dark-reversed to generate a reversed code symbol 1R. By doing this, a laser marker 10 is controlled so as to apply a laser beam to the cell of the background portion without applying the laser beam on the cell of the code portion. On the other hand, in the case of the normal material in which the marking unit becomes a dark mark, the laser marker 10 is controlled to apply the laser beam to the cell of the code portion without applying the beam to the cell of the background portion.

Abstract: The 2-dimensional code formation method of this invention comprises: a process of specifying the code size for 2-dimensional code; a process of specifying storage information to be written in the 2-dimensional code; a process of setting the cell size for the unit cell of the 2-dimensional code; a process of specifying the dot step size or the number of dots n x m (where n and m are natural numbers) arranged vertically and horizontally inside the unit cell; a process of creating laser-marking information based on the code size, storage information, cell size and step size or number of dots; and a process of performing laser marking of the 2-dimensional code based on that laser-marking information.

Abstract: A scraper filter system, which comprises a screw-formed spiral impeller within a cylindrical filter element, and a scraper in the groove formed along the spiral end of the impeller for engagement with the internal surface of the filter element for scrapingly removing solid components deposited on the surface of the filter element.The scraper is comprised of a plurality of separate arcuate segments each being urged radially in the external direction by a resilient member, and also includes a securing element for preventing movement of each segment in the groove with respect to the spiral edge of the spiral impeller.

Abstract: A scraper filter system, which comprises a screw-formed spiral impeller within a cylindrical filter element, and scraper means formed along the spiral end of the impeller for engagement with the internal surface of the filter element for scrapingly removing solid components deposited on the surface of the filter element.Further the present invention provides a filter system, which comprises a cylindrical filter element, a cylindrical casing allowing liquid components to flow from the inside to the outside through the filter element, a spiral impeller with the scraper means for engagement with the internal surface of the filter element for removing solid components, and further comprises a feed liquid inlet at one end of the cylindrical casing and filter cake discharge means including a cake discharge outlet at the outlet end of the casing.

Abstract: A locking structure of a wire rod for a filter element which comprises a support member of either a cylindrical, flat plate or inverted conical shape, a threaded groove helically formed on an outer or inner peripheral surface of the support member, along which groove a wire rod of a desired sectional form is wound, leaving a spiral continuous slit between windings, allowing flow of a fluid to be filtered or separated. Each end portion of the wire rod is bent so as to be merely pushed and firmly secured in a locking hole formed on the support member, without using a locking member such as an insert member or wedge.

Abstract: A locking structure of wire rod for filter element, which comprises perforating a locking hole larger than a sectional area of the wire rod near both ends or either one end portion of a cylinder with a passage leading in and out provided thereon, inserting an end portion of the wire rod in the locking hole, fixing mechanically the end portion of the wire rod by pushing forcedly in on a wedge. It is further intended that the wire rod is particularly formed triangularly in section, a threaded groove angled same as the top is formed to a desired slit on an outer peripheral surface of the cylinder, the surface on which the wire rod is wound is made even peripherally, thereby functioning effectively as surface filtration and surface separation.

Abstract: A multi-purpose separation apparatus comprises a container body movable upward and downward freely in which is provided a cylindrical filter element having functions such as separating and grading, with which is provided a lid having a pressured gas transfering means for pressing in, extracting, and extruding, and to which a driving source is connected; a rotary blade device for preventing clogging of the filter element and/or for stirring; a support structure for guiding the upward and downward movement of the container; and a discharge valve device for taking out a material treated through the filter element.