JP2001158002A - Stroke saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precision cutting saw which is free from the constant bearing of a load upon the same sawteeth during feeding a flange and thereby averts the effect of making the sawteeth obtuse and further, meets requirements for high linearity-retaining cut. SOLUTION: The stroke saw 10, especially a precision cutting saw has a fitted saw blade 15 which is replaceable and is driven in a reciprocating manner. In addition, the saw blade 15 has a linearly extending blade spine part and downward sawteeth 26 arranged in a single row on the opposite lower side 27 to the saw blade spine part. Further, the lower side 27 is protruded outwardly in a curved bow shape across the almost entire length of the sawteeth 26. In this case, the lower side 27 has the sawteeth 26 implanted over the entire bow- shaped region. Thus it is possible to ensure a correct flush or separation cut or a correct pocket cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
aeg), especially a precision saw, which is interchangeable,
A reciprocally movable saw body is provided, and the saw body has a straight back body and a row of outwardly facing saw teeth on the lower side opposite to the back body. About the format you are doing.

[0002]

BACKGROUND OF THE INVENTION German Patent Publication No. 19756
No. 766 discloses a stroke saw in which the saw body is formed substantially square, in which case the side with the outwardly facing saw teeth is substantially parallel to the back of the saw body. Extends linearly. Since the saw body has such a shape, this process saw is performed by flash cutting (Buend
igschnitt) or separation cut (Trenns)
chnitt) and pocket cut (Tasche)
nschnitt) is not suitable or only partially suitable for manufacturing. The workpiece placed on the support is flash cut or cut off (A
On bschneiden), there is a risk of damaging the surface of the support. Furthermore, there is a problem in forming a notch cut (Ausschnitt) inside a plate-shaped work, for example, a thin plate. At the start of cutting and at the time of application to the workpiece, the body is guided relatively little.
As a result, an accurate first cut, that is, a start of cutting (Ansc
hnitt) is difficult to fabricate. The same tooth is always loaded at the time of plunge feeding to invite the body into the work,
This causes the tooth to blunt relatively early.

German Utility Model No. 295017
In accordance with the specification of US Pat. No. 08/083, a saw of the type in which a body is inserted into this receiving part of the stroke at a clamping end provided at one end thereof and projects freely vertically in a cantilever manner therefrom. This is known. The body has a body back that extends straight from the clamped end to the front body tip. A row of downward saw teeth is provided on the side opposite to the back of the saw body. In that case, the region starting from the clamping end and directed towards the tip of the body is substantially straight and has saw teeth. Subsequent to this linear area, there is provided an arcuate area which is guided to the tip of the saw and is curved outwardly convex, this arcuate area also having a row of saw teeth. are doing. In that case, at least one of the teeth arranged at the apex of the arcuate region is arranged so as to be used for cutting during plunge feed sawing. Insufficient guidance on the body during this process,
This process has the disadvantage that it does not satisfy the requirements for cutting quality, in particular for cutting with high linearity.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above disadvantages.

[0005]

SUMMARY OF THE INVENTION According to the invention, the object is achieved, according to the invention, in a process of the type described at the outset, in which the lower side is outwardly convex over substantially its entire length. This problem is solved by providing a curved, arcuately extending arc and having a sawtooth over the entire arcuate region.

[0006]

The precision of the flash cut, the separation cut and the pocket cut can be achieved by the blade portion which extends in a bow shape in the vertical direction and in a bow shape over the entire length of the body. Due to the arcuately curved shape, it is possible to cut protruding parts of the work into flashes (buendig) without damaging the surface of the support even if the work is placed on the support. it can. Similarly, pocket cuts, in other words, narrow cuts in, for example, a plate-shaped work, or even separate cuts, are possible. This is possible with a clean cut. Due to the fact that the cutting edge extends in an arcuate manner in the longitudinal direction, there is no danger that only one tooth is loaded during the plunge feed in pocket cutting, and thus premature dulling of the tooth does not occur.

[0007] The configuration according to the dependent claims is this advantageous embodiment of the process according to claim 1 and an improved configuration.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the illustrated embodiments.

The hand-held sawing machine shown in perspective in FIG. 1 is formed as a stroke saw 10 and constitutes an embodiment for an electric hand-held machine tool. The stroke saw 10 comprises an elongated machine casing 11, which is simultaneously formed as a gripping part, and a head 12, and in the transition region between the machine casing 11 and the head 12,
A constriction 13 is provided for improving manual operation.

In general, an electrical drive (not shown) is received in the machine casing 11, which is mounted on one side of the head 12 by a tensioning device 14. 15 is driven to make a reciprocating vibration motion. In the area of the head 12, a transmission (not shown) is received, which is engaged with the rotor shaft of the drive motor and is shown at right angles to this rotor shaft. Has no driven shaft,
In addition, an invisible connecting rod drive (not shown) is driven for driving the saw body 15 via the driven shaft.

The saw body 15 is slidably received longitudinally in a guide rail 16 and, together with the guide rail 16, a separate, preferably non-separable, piece of saw cassette 17. It forms a component unit which can be clamped in a tensioning device 14 provided in the machine housing 10.

The guide rail 16 is formed as a straight part and has two guide legs 18, 19 located on each side of the saw body 15, these guide legs being folded. It may be integrally connected to one another via the bent edge 20 or alternatively formed as two separate components and then connected to one another along the longitudinal edge. The saw blade 15 is of a general type, for example, two pin-slit coupling mechanisms (Sift- / Schlit) symmetrically arranged with respect to the center of the length of the saw cassette 17.
It is held in the guide rail 16 by zverbindung and is slidably guided within certain limits. In order to clamp the saw cassette 17 into the tensioning device 14 of the stroke saw 10, a tensioning element in the form of, for example, fasteners 21, 31 is formed on the guide rail 16. The tensioning device 14 operates in a conventional manner on the principle of ski binding. The tensioning device is provided with a pin, not shown, which is inserted into the opening 22 provided on each side of the guide rail when the cassette 17 is inserted. The connecting rod drive for driving the saw body 15 has a drive finger (not shown), which is driven through a slot 23 provided on each side of the guide rail 16 for drive connection. The body 15 is inserted and engaged in the notch 24.

A saw cassette 17 consisting of a guide rail 16 and a saw blade 15 which is held undetachably and slidably in the longitudinal direction is replaceable and can be replaced when mounted on the stroke saw 10. Can be fixed by the tensioning device 14 at the same time that the saw 15 is connected to the above-mentioned driving device for reciprocatingly driving the saw 15. The back 25 of the saw body 15 extends in the longitudinal direction of the guide rail 16, in which case the saw body 15 may extend beyond the guide rail 16 or terminate substantially with the guide rail. May be.

The saw body 15 has a row of outward saws on the side opposite to the saw body back 25, that is, on the side forming the lower side in FIGS. 1, 3 and 4. It has teeth 26.
This lower side extends over almost its entire length,
And has an arcuately curved outwardly extending from one end to the other end in a longitudinal direction, and is provided with saw teeth 26 throughout the arcuate region. The side extending in a bow shape is designated by the reference numeral 27. This side preferably extends in an arcuate manner corresponding to approximately one arc segment. The straight back 25 then extends substantially corresponding to the secant of the arc.

FIG. 3 schematically shows a process saw 10 in the shape of a precision cut, and a workpiece 2 positioned on a support 28.
9 for use in cutting strips (Leistes), for example. In this case, the side 27 with the saw teeth 26 extends outwardly in an arcuate manner, so that a protruding part such as a workpiece 29 can be sawed without damaging the support 28. Clearly, it is possible.

FIG. 4 shows how a notch cut 32 is made in a plate-like work 30, for example, a thin plate, that is, how a pocket cut is made by the same process 10. Instead of the notch cut 2, a part of the plate-shaped work 30 can be separated from the remaining part, that is, a separation cut can be performed. The body 15 in this case is a guide rail 16
Since the body 15 is guided inside, the body 15 is guided well. A high quality of the cut is thus achieved during the operation according to FIGS. 3 and 4, whereby the high requirements for the quality of the cut, in particular for maintaining linearity, are satisfied. In the first cut of the operation according to FIG. 4, the plurality of saw teeth 26 are already engaged, so that the load is distributed to the plurality of saw teeth 26. Based on this, and based on good guidance by the guide rails 16, an extremely clean cutting is possible, for example, when producing the opening 32. The stroke saw can be kept in a horizontal position during the production of the pocket cut. As a result, there is no danger of a reaction impact as compared with a stitch saw. In any case, the stroke saw 10 is simple to operate.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of this process of wearing a body according to the invention.

FIG. 2 is a schematic perspective view of a body for this of the process shown in FIG. 1;

FIG. 3 is a schematic perspective view when the stroke saw shown in FIG. 1 is used for manufacturing a flash cut.

FIG. 4 is a schematic perspective view when the stroke saw shown in FIG. 1 is used for producing a pocket cut.

[Explanation of symbols]

10 stroke saw, 11 machine casing, 12 head, 13 constriction, 14 tensioning device, 15
Saw body, 16 guide rails, 17 saw cassette, 18, 19 guide legs, 20 bent edge, 2
1 tensioning element, 22 opening, 23 slot,
24 notches, 25 backs, 26 saws, 2
7 bowed lower side, 28 support, 29,3
0 work, 32 notch cut

Claims (10)

[Claims] 1. A process saw, particularly a precision cutting saw,
An exchangeable, reciprocally drivable body (15) is provided, wherein the body extends linearly.
And a row of outwardly facing saw teeth (26) on the lower side (27) opposite the back of the saw body, wherein the lower side (27) has approximately the entire length thereof. A stroke saw characterized in that it curves outwardly convexly and extends in an arcuate manner and is provided with saw teeth (26) over the entire arcuate region. 2. An arcuately curved side (27) with a saw tooth (26) extends in an arc corresponding to approximately one arc segment, and the saw body back (25) has an arc. 2. The stroke according to claim 1, wherein the stroke extends substantially corresponding to the score line of the first. 3. The saw body (15) is held in a vertically extending guide rail (16) and is slidably guided, which vibrates the saw body (15). 3. A stroke saw according to claim 1, wherein the body is connected to a drive device which is reciprocally driven and can be fixed in the tensioning device at the same time. 4. The process saw according to claim 3, wherein the saw body and the guide rail form a unitary cassette. 5. The guide rail (16) is provided on the back of the body (2).
5) and the following body on either side of the back (1)
5. The stroke according to claim 3, wherein the stroke extends in the region of the wide surface of 5) and acts as a guide. 6. The saw body according to claim 3, wherein the saw body extends longitudinally beyond the guide rail at the saw back, or terminates substantially with the guide rail. The process described in any one of the items up to 5. 7. A replaceable, reciprocally drivable body (15) for this part of the travel, wherein the body extends linearly, and the body back (25) comprises: Of the type having a row of outwardly facing saw teeth (26) on the opposite lower side (27), wherein the lower side (27) of the saw body (15) extends over substantially its entire length. A saw body characterized by an outwardly convex arcuately extending arcuate shape and having a sawtooth (26) over the entire arcuate region. 8. An arcuately curved side (27) having a row of saw teeth (26) extends substantially corresponding to one arc segment and the saw body back (25) has an arcuate shape. 8. The body according to claim 7, wherein said body extends substantially corresponding to the score line. 9. A guide rail (16) is relatively slidably held on a body (15) in the region of the body back (25), by means of which guide body (15). 1
5) can be fixed in the tensioning device (14) of the stroke saw (10), and at the same time, the driving device for reciprocatingly driving the saw (15) and the saw (15) are connected. 9. The body according to claim 7 or 8, wherein 10. Saw body (15) with guide rails (16) continuing on both sides of the back body (25) and the back body.
10. The body according to claim 7, wherein the body extends in the region of the wide surface and acts as a guide.