SE515503C2 - Method and apparatus for aligning objects relative to light marking - Google Patents

Abstract

A method and a device for aligning an object relative to a projected image independently of special characteristic features of the object. Instead of using object-inherent features, there is applied to the object an indicator that consists of a rotational punctiform marking for the alignment of said object, and a scale for controlling rotation when aligning the object. The marking may be a painted, printed, scored marking to a marking applied to the object in some other way. This enables the object to be aligned precisely and selectively with the aid of a simple projected image as a reference, for instance an image comprised of mutually intersecting laser lines.

Description

The object is achieved by the invention as set out in the appended independent method claim. The purpose is also achieved by means of a device specified in the appended independent device requirement.

Basically, the invention means that the special characteristics of the detail are disregarded. Instead, a marking is applied to the part, consisting of a point of rotation marking, which characterizes the axis of rotation of the part and according to which the part is placed relative to the light mark, and wholly or partly around it a scale according to which the part is rotated relative to the light mark. The marking can be painted, printed, engraved or otherwise affixed to the part.

This gives the opportunity to place the detail precisely and with any orientation with a simple light mark as a reference, such as intersecting laser lines.

The laser lines can, for example, be created as stated in Swedish patent application 9901228-8.

The invention will be described in the following in an exemplary form with reference to the accompanying drawing.

Fig. 1 shows a side view of a mounting jig for the manufacture of a truss.

Fig. 2 shows a plan view of a mounting jig for manufacturing a truss before installation.

Fig. 3 shows a plan view of a roof truss during manufacture, resting on mounting jigs. As a field of application for the invention, the placement of mounting jigs in the manufacture of trusses is described. This is done in preparation for the production of a series of trusses, standard series size 10 - 12 pcs. High accuracy is required to achieve precision in subsequent steps. According to current technology, a guide ruler is used on the floor, the wood for the first truss and measuring tape. The time required is about 25 - 30% of the total time depending on the complexity of the truss.

With the use of the invention, the setting time can be more than halved, and the precision becomes higher than with manual measurement with measuring tape according to current technology.

Figures 1 and 2 show a mounting jig for roof trusses with the support surface 1 for the timber and with a groove 2 for attaching guides 3 against which the timber is to be fitted. The pressure plate 4 is movable vertically to allow it to be raised when pressing nail plates placed on it under the wood. On the pressure plate there is a rotation point mark 7 and scale 8 engraved. Alternatively, the scale 8, which does not have to be circular, is placed on the support surface 1 closer to the outer edge in order to be made larger. A base plate 5 rests on a sheet metal floor and a magnet 6 holds the jig in position.

Fig. 2 shows a light mark in the form of two intersecting laser lines 9. The intersection of the lines indicates a position carefully calculated for the mounting jig of the construction program for trusses, indicated by the coordinate point and angle of the 10 15 20 ”Åjü 515 505 working drawing. The jig 10 is placed with the rotation point mark 7 in the middle of the intersection of the laser lines. Then alignment is performed by rotation so that the intended marking on the scale 8 follows one of the laser lines 9.

The procedure is repeated for other jigs.

Another area of application is the placement of nail plates for joining the truss. Fig. 3 shows the truss with the nail plates 12 placed before pressing. In order for calculated dimensions of wood and nail plates to apply, a deviation of a maximum of 5 mm is allowed when placing the nail plates.

If nail plates are provided with markings according to the invention, the patent-pending method can also be applied in this case.

In the examples, light marks in the form of intersecting laser lines have been used. Of course, other forms of light marking may be used in the practice of the invention.

An example might be a straight line with a short break that marks the center, against which placement takes place.

Claims (6)

10 15 20 25 30 n. V .. - u -n n v: n I 1 »-n -»;. n. Q. | u n »u. v» w; u u n. 5 nu n »v n: n: run 0. n u - nu u a. | n a n> n | _. f. P a t e n t k r a v 1. A method for placing an object on a flat work surface in a selected position and in a selected orientation in the plane of the work surface, wherein a light image is projected towards the work surface, characterized in that the object is provided with a dot mark (7) and a rotation scale (8) around the point mark, that the light image is designed with a point mark and a reference radius to the point mark of the light image and that the object is oriented relative to the projected light image so that the point markings of the object and the image correspond and that the image's reference radius assumes a selected rotation position. Method according to claim 1, characterized in that the light image (9) is established by two intersecting laser light planes intersecting in the working plane and that the intersection of the laser light plane is used to define the point marking of the image, a projection in the working plane of one of the laser light planes forming a line (9 ), is used as the reference radius. Method according to claim 1 or 2, characterized in that the laser light plane is displaced independently of each other so that their projections in the working plane form lines (9) which are parallel displaceable in the plane, the laser light plane projections in the working plane forming each other preferably perpendicular cutting lines, the bullet. 10 l5 20 _,. I 1: nu uu »- = 2 - | -_ v, u = v. I y | nu »q 1; ~ 1 | o un: ff. | I 1 v n I | 1 v \ »~ ~ - 1 -v \ I o> n 1 .; 1- Plant for placing an object on a flat work surface in a selected position and in a selected orientation in the plane of the work surface, comprising a device for projecting a light image towards the plane of the work surface, characterized in that the object carries a dot mark (7) and a rotation scale ( 8) around the marking and that the light image comprises a dot marking and a reference radius, whereby the surface markings of the object and the image can be brought into alignment and the object can be given a selected orientation relative to the reference radius of the image by means of the scale. Plant according to Claim 4, characterized in that the object is a truss jig and that the jig has adjustable guides (3) for truss beams. Plant according to claim 4, characterized in that the object is a nail plate (12) which is to be mounted on a truss frame for interconnecting beams therein. ---