WO2010054631A1

WO2010054631A1 - Cut-out saw

Info

Publication number: WO2010054631A1
Application number: PCT/DE2009/001577
Authority: WO
Inventors: Gerhard Arlart
Original assignee: Gerhard Arlart
Priority date: 2008-11-12
Filing date: 2009-11-06
Publication date: 2010-05-20
Also published as: DE102009011762A1

Abstract

The invention relates to a cut-out saw (1) for cutting out preferably rectangular cut-outs, typically from board materials. The cut-out saw (1) comprises a saw housing (3), which houses a drive unit having a transmission and a saw blade (6) attached thereto and which is integrated in a pivot and lifting apparatus (2) such that a saw blade (6), which initially is not engaged with a workpiece (16), is transferred from a movement direction having a parallel portion to the surface of the workpiece (16) into a movement direction having at least one completely vertical portion with respect to the surface of the workpiece (16) and at the same time can engaged with the workpiece (16). As the saw blade (6) penetrates into the workpiece (16), the invention proposes the possibility (10) to fix the cut-out saw (1) to a guide rail (14) and then, after the penetration process has been carried out, to either push or pull the guided cut-out saw (1) with the help of the guide carriage (4) along the guide rail (14), with a sawing operation taking place in both directions.

Description

Ausschnittsäge

description

The invention relates to a cutting saw for sawing preferably rectangular cutouts from usually plate materials.

Such cutouts are often required in various areas of woodworking and other trades such as hall construction. Door cut-outs, sink cut-outs, cut-outs for various uses such as screens are some examples of their recurrent need. Usually, such cutouts are made directly on site by means of dip saws, a type of circular saws. The disadvantage of this type of production is that the size of the cutout must first be torn open on the workpiece. Then, a guide rail is mounted on the workpiece to move the saw along it to achieve a straight cut. For a rectangular cut-out, it is necessary to fasten the guide rail at least four times, whereby the maintenance of the perpendicularity to the previous cut can only be accomplished with difficulty with the new fastening. Due to the circular shape of the saw blade, a cut lying exactly vertically to the workpiece surface can not be created in the corner region of the cutout. In addition, when hitting the currently created cut on a previously made exactly on it to pay attention that not Sawed beyond the latter. If the corner area in two colliding cuts in the vertical direction to the workpiece surface, ie over the entire thickness of the workpiece, clean square and sharp-edged, must be reworked in such cases using, for example, a hand saw.

Another way to create cutouts, offer commercial jigsaws. On the one hand, however, these can only be insufficiently achieved; on the other hand, due to the design of the saw blade, right-angled cuts are scarcely possible with respect to the workpiece surface. In addition, a tearing of the cutting edges, especially at the top of the workpiece can be avoided only with increased effort. In addition, the problem of repeated implementation of the guide rail as well as in diving saws occurs.

A precise production possibility for cutouts is that of CNC-controlled machining. Unfortunately, however, disadvantages are to be expected here as well. Since milling tools are usually used for the production, no sharp-edged right-angled cutout can be made in the corner area. The corner region has the radius of the milling tool in this type of production. Another problem arises from the immobility of such machines. For the production on site they are unsuitable. In addition, when milling relatively much material is machined, so that an extraction is essential. A good and proven solution for on-site production is the use of hand routers in conjunction with milling templates.

From DE 196 40 031 C1 a milling template is known, which has a windmühlen- wing-like arrangement of the guide rails, whereby a stepless and rapid adjustment is ensured. After setting to the desired size of the cutout on the guide rails, the router is guided along the inner edge of the milling template by a copying sleeve arranged concentrically around the milling tool, thus creating the cutout. Mobility and individual size adjustment are in this way the cutting position certainly given, however, the problem remains the relatively large Materialzerspanung Cutting and the rounded corner area of the cut due to the use of milling tools. In addition, the duration of a milling process by means of routers is considerably longer than that of a sawing process.

The present invention is therefore based on the object to provide a rational way to produce cutouts, are avoided in the disadvantages that occur both as a result and during production, while exploiting the advantages of known manufacturing methods.

This object is achieved according to the invention by the features of the main claim. Additional advantageous embodiments can be found in the subclaims.

The cut-out saw then has a saw housing housing a rotating drive unit connected to a gearbox, wherein by means of the gearbox the rotation of the drive unit is translated into a linear motion or oscillating movement of a replaceable saw blade secured to the gearbox by a tensioning device. The type of such saw blade movement is the same as that of commercial jigsaws.

The aforesaid sawing housing housing the drive unit with gearbox and attached saw blade is itself pivotable and height-displaceable on a pivoting and lifting device, such that the saw blade, which is not in engagement with the workpiece at the beginning of a sawing operation, faces the workpiece surface pointing teeth from a directed for example parallel to the workpiece surface saw blade movement in a direction perpendicular to the workpiece surface and thereby simultaneously be engaged with this engaged blade movement can be brought. With such pivoting of the saw blade in the workpiece surface, it is also possible to fix the position of the saw blade by means of predetermined latching steps on the saw housing and pan and lifting device at a certain angle to the workpiece surface and then the entire saw housing in this position zuzusch- on the workpiece surface. move, with the saw blade into the workpiece and penetrate this.

The choice of a certain plunge angle of the saw blade over latching steps has the advantage that an optimum angle is achieved. If this is too large, the saw blade performs a pure impact movement in the direction of the workpiece surface. A penetration of the saw blade is impossible. The workpiece, saw blade and the entire saw are thus damaged. If the angle is too small, a penetration of the workpiece is also not possible. If the workpiece is penetrated by the saw blade, the depth of the penetration can be fixed by a locking device, which is important for different workpiece thicknesses and ensures good utilization of the entire sawtooth area. An additional advantage of the locking steps and the simultaneous possibility of depth adjustment is that the saw blade can be immersed only slightly at a certain angle in the surface of the workpiece, which has a Vorrit- zen the material result, thereby tearing the upper during subsequent sawing Cutting edges of the cut is avoided.

Another device on the pivoting and lifting device is found with a limitation for the angle of the saw blade leading edge to the workpiece surface over a predetermined amount. If sharp-edged cut-outs perpendicular to the workpiece surface are to be created in the corner area, said angle must not exceed 90 °.

In addition to the pivoting and lifting device, the invention also provides a guide carriage before. This guide carriage is on the one hand on a guide rail, such as a guide rail of the milling template DE 196 40 031 C1, play-free longitudinally displaceable and fixed to this at any position and on the other hand firmly connected to the swivel and lifting device. In this way, it is possible to use the cutting saw for straight cuts in combination with known milling template. In order to be able to guide the cut-out saw on the left and right sides, an attachment possibility on both sides of the the pivoting and lifting device provided. Thus, cut-outs can be created clockwise and counterclockwise.

The saw blade of the cutting saw differs from that of a conventional jigsaw. The main body then has about 2-3 times the thickness and a 3-4 times the width of the ordinary jigsaw blades. This serves to prevent bending of the sheet, among others. prevents immersion and better guidance in straight cuts is achieved. Another peculiarity is that the saw blade not only has teeth in the thrust direction when viewed after penetrating the workpiece during the cutting operation, but also in parallel in the opposite direction, i. in the pulling direction. This offers the possibility of the saw, after placing the guide carriage on a guide rail in both directions along this guide rail to a certain point, which is determined on the one hand by the respective transverse guide rails and on the other hand by adjusting screws on the pivoting and lifting device to move. The saw blade is also tapered towards its free end in such a way that when it is immersed in the workpiece, the force that counteracts the movement of the saw blade, as low as possible.

To create a cutout, the known milling template is set to the desired dimension and fastened to the workpiece. The cutting saw is placed on a guide rail and fixed, then pressed the saw with an engaged angle of saw blade to workpiece surface in the direction of the workpiece until the saw blade engages the workpiece and penetrates it. Then the cutting angle is changed until it reaches about 90 ° to the workpiece surface. Now, after the sawing depth has been set and determined, the saw can be pushed forwards and pulled back until each of the adjusting screws touches the respective transverse guide rails and limits the saw cut. This is repeated four times for a quadrangular cutout, the result being exact corner and sharp-edged cutouts. Of course, the sawing of cutouts with the cutting saw without the aid of guide rails is possible. For this purpose, located at the bottom of the pan and lifting device, for example, a lever to be operated, extendable anti-slip feet that protrude after actuation of a lever from the bottom of the pan and lift and prevent slipping of the saw on the workpiece. After the subsequent immersion process already described, a subsequent movement of the saw to create the cut-out after lifting the anti-slip feet in the original position is possible again.

The invention will be explained in more detail with reference to an embodiment in conjunction with accompanying drawings. They show:

Figure 1: a side view of a guided cutting saw on an indicated milling template in a perspective view;

FIG. 2 shows a front view of a guided cutting saw on an indicated milling template in a perspective view; and

3 shows a schematic representation of possible different insertion angles of a saw blade of a guided cutting saw in a coordinate system.

The total designated 1 guided cutting saw has a saw housing 3, which houses a non-visible drive unit and a related transmission. On the gear that translates the rotational movement of the drive unit in a linear or oscillating motion, a saw blade 6 is attached via clamping device. The saw housing 3 in turn is integrated in a pivoting and lifting device 2 such that the saw blade 6 can be transferred from a, for example, to the surface of a workpiece 16 parallel saw blade movement in a surface of the workpiece 16 to the vertical movement. In this case, the teeth 19 of the saw blade 6, initially pointing in the direction of the workpiece 16, are fastened to the workpiece 16. moved and engaged with this. In this Einschwenkvorgang can be selected over predetermined latching steps 18 on the saw housing 3 and the pivoting and lifting device 2, the optimum immersion angle between the saw blade 6 and the O- berfläche of the workpiece 16.

As shown in FIG. 3, the surface of the workpiece 16 is in this case parallel to the abscissa, it can be seen that at the plunge angle 26, the direction of movement of the schematic saw blade 27 exclusively a direction parallel to the orininatenachse, the coordinate system, which is a dipping of the saw blade 27 in a workpiece 16 impossible. When choosing, for example, a dip angle 25, a certain part of the direction of movement of the schematic saw blade 27 runs parallel to the ordinate axis, another part parallel to the abscissa axis, whereby a sawing operation takes place and immersion of the saw blade 27 is made possible.

If the saw blade 6 is immersed in the workpiece 16 at the optimum angle and has penetrated this, the movement direction of the saw blade 6 is changed by means of the pivoting and lifting device 2 so that it assumes a vertical direction, for example, to the surface of the workpiece 16. A boundary 22 prevents that of the angle between the leading edge of the saw blade 6 and the surface of the workpiece 16 is too large. Subsequently, the depth of the penetration of the saw blade 6 can be adjusted by moving in the grooves 7 and fixed with Feststellungsknäufen 8.

This happens after the cutout saw 1 has been placed by means of the guide carriage 4 on a guide rail 14 of a milling template designated overall as 9 in such a way that it can be moved along the latter by means of a guide aid 21, the guided cutting saw 1 before the sawing process for dipping the saw blade 6 by means of the locking knob 10 is fixed at an arbitrary position of the guide rail 14, thus allowing a clean immersion in a workpiece 16. After the immersion can be sawed both in the thrust direction due to the teeth 19 located on the saw blade 6 and in the pulling direction due to the teeth 20. The Length of a saw cut 15 is limited on the one hand by the direction of sawing transverse guide rails 14 on the other hand by precisely adjustable screws 12 and 13, which allows a high precision of the cutout.

A further embodiment of the invention provides for the quick mounting possibility of the guide carriage 4 on both sides of the pivoting and lifting device 2 via holes 23 provided therefor, whereby the sawing with the guided cutting saw 1 clockwise and counterclockwise is possible.

Claims

claims

1. cutting saw for sawing cutouts usually made of sheet materials, characterized by a drive unit with a connected gear that transforms a rotational movement in a linear or such a similar type of movement and on a saw blade (6) Ci- conveys housings sawing housing (3), which is integrated in such a pivoting and lifting device (2), that at the beginning of a Sägevorgan- not with a workpiece (16) engaged blade (6) from a direction of movement with a parallel portion to the surface of the workpiece (16) can be transferred in a direction of movement with at least fully vertical portion to the surface of the workpiece (16) and at the same time brought into engagement with the workpiece (16), after penetration of the workpiece (16) the saw housing (3) with befindlichem saw blade (6) is fixable at a desired height above the workpiece (16).

2. cut-out saw according to claim 1, characterized in that the pivoting and lifting device (2) locking steps (18), which offer the possibility of the optimum insertion angle between the leading edge of the saw blade (6) and a workpiece (16) choose.

3. Cutting saw according to claim 1, characterized in that the saw blade (6) has teeth (19) and (20), a machining of the material with the by a workpiece (16) squat and in its direction of movement with respect to the surface of the Workpiece (16) approximately vertically moving saw blade (6) along a guide rail (14) during the sliding of the cutting saw (1) as well as during their drawing allow.

4. Cutting saw according to claim 3, characterized in that the saw blade (6) used at its free end in the direction to the workpiece facing direction of its teeth (19) to reduce the resistance during

Dipping into the workpiece pointed.

5. cut-out saw according to claim 1, characterized in that the guide unit (5) possibilities (12) and (13) provides that provide an adjustable length limit in both cutting directions along the guide rail (14).

6. cutting saw according to claim 1, characterized in that on the pivoting and lifting device (2) has a boundary (22) for the largest possible angle between the leading edge of the saw blade (6) and surface of the workpiece (16) is mounted.

7. cutting saw according to claim 1, characterized in that the distance between the one saw cut (15) facing edge of a guide rail (14) and erstgenanntem via an adjustment on the guide carriage (4) is variable.

8. cutting saw according to claim 1, characterized in that on the workpiece-facing side of the pivoting and lifting device (2) extendable anti-slip feet are provided.