CZ20011166A3 - Circular saw - Google Patents

Abstract

The invention relates to a circular scoring saw, comprising a scoring tool (20) which is composed of two partial blades (1, 13). Each partial blade (1,13) is mounted on a tool half (3,16) which is connected to a common drive element (27) and the first tool half (3) can be axially displaced in relation to the second tool half (16) to adjust the cutting width of the scoring tool (20), using an adjustment device (6). According to the invention, the axially displaceable first tool half (3) can be impinged upon by at least one force-fit element (17) and is connected to a nut (6) which can be axially displaced and locked in relation to the second tool half (16).

Description

Circular Saw

2512 £ 1-t £ 252HX

BACKGROUND OF THE INVENTION The present invention relates to a circular saw for cutting with a cutting tool made up of two cutting discs, each cutting disc being arranged on one tool half connected to the driving element and the first tool half being axially displaceable relative to the other half of the cutting tool.

Up to £ 2 defective - status_ 1 echniky

Circular saws are used in particular when material with a sensitive or brittle coating is to be separated by means of a circular saw blade. In such a separating cut, saw teeth protruding from the tool could lead to tearing on this side of the tool or cause removal of the coating.

In professional woodworking, the circular saw blade for cutting is therefore upstream of the separating disc when sawing, in particular, coated material plates with circular saws. In doing so, the cutting disc first separates the endangered lower covering layer and creates a cutting groove of a small depth. In order to produce a clean and tear-free cutting edge on the material plate on the output side of the disks, the effective lines, i.e. the cutting gaps of the two disks, must be directed towards each other. Similarly, the cutting gap width of the cutting disc must be adapted to the separating disc used.

The formation of such a notch groove is usually performed in a manner with movement in the same direction, while the cutting tool performs a counter-rotational movement.

[0005] The following methods or tools are known in the art for adapting, i.e. adjusting the width of the cutting grooves of circular saws for table saws, among others.

A cutting tool is known in which the width of the cutting groove is formed by appropriately inserting spacer rings between two separate cutting discs. For this adaptation, at least one part of the tool set must be removed from the drive shaft.

Also known is a cutting tool composed of sub-discs, wherein the width of the cutting groove is varied by operating the adjusting device by means of an operating tool. In this case, the cutting tool does not have to be removed from the drive shaft for adjustment.

This prior art comprises a cutting tool for a circular saw according to DE-GM 295 04 233.8, in which a adjusting device, which is designed as a threaded spindle, is used for adjusting the two sub-discs which form the cutting disc. This threaded spindle is screwed into the first tool half and is rotatably held in the second tool half.

A special tool is required to adjust this threaded spindle, creating uncomfortable handling.

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Another prior art produces a cutting tool according to DE 196 24 518 A1, in which a spacer shaft is used which, under the action of axial forces, leads to adjustment of the sub-disks in terms of their distance.

Here, considerable construction costs are expected, which leads to an increase in the cost of the entire plant.

In addition, the prior art apparatus for cutting boards described in EP 0 273 200 B1, in which the two sub-disks are arranged on parallel arms, which have telescopically connected sleeves on their inner sides. Here too, considerable construction costs are incurred.

Substance_of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a circular saw for cutting of the kind mentioned at the outset, in which the width of the cutting groove to be created can be manually adjusted in advance without the aid of a control tool.

According to the invention, this object is achieved in that the axially displaceable first tool half is operable by means of at least one force coupling element and is connected to a nut axially adjustable and lockable against the second tool half. This creates the advantage that by disengaging the nut lock and turning it, it is possible to manually pre-set one sub-disc against the other sub-disc without the aid of a control tool. This adjustment is preferably carried out in small steps, for example about 0.05 mm. The adjusting mechanism used can be of such a small size that the entire cutting unit can be used in particular in table saws and circular saws in narrow spatial proportions.

The adjustment is possible without the cutting tool having to be removed from its intended mounting location, i.e. from the drive shaft. The adjusting device is preferably designed such that no significant imbalance occurs in the folded cutting tool. Moreover, this adjusting device is not adversely affected by the acceleration or braking torque of the tool drive.

According to a first embodiment, the two cutting discs are fixed at a predetermined axial distance by means of a spring force, i.e. the sub-discs of the folded cutting tool are thus held.

Alternatively, it is also possible to fasten both cutting discs at their preset axial spacings by means of axially acting forces and their centrifugal forces. The operating of the adjusting device is particularly easily accessible and the friction grip in the adjusting thread is negligible.

To carry out the above measures, the second tool half according to a further feature of the invention may have a flange that extends through the first tool half and whose end region is threaded for axial movement of the nut. In this case, the actuating part, which can be locked by means of at least one latching element to the first tool half, can be connected to the nut.

According to a further embodiment of the invention, it may have

at least one spring on the outer periphery of the nut axially displaceable bearing control portion for the at least one cylindrical pin as a latching element, the cylindrical pin being retractable into one of the blind holes of the first tool half and the blind holes being distributed in the first tool half . By locking the cylindrical pins into corresponding recesses, for example twenty pieces, i.e. blind holes, in the first half of the tool, a certain axial adjustment path is achieved, for a snap-in of approximately 0.05 mm. This adjustment path corresponds to the relative axial distance change of the first sub-disc relative to the second sub-disc. In the case of circular saws, the groove width x is thus changed

According to a further embodiment of the invention, the blind holes are preferably arranged evenly distributed over the diameter of the pitch circle.

Two diagonally opposed cylindrical pins may be mounted in the actuating portion, each of which, on the front side, pass through one through hole in the nut flange and can be inserted into the corresponding blind hole of the first tool half.

According to a further feature of the invention, a support ring provided with a contradictory locking ring may be provided on the nut opposite to the flange, which forms a bearing surface for two diagonally opposite springs acting on the actuating portion.

In this case, the support ring can have a guide surface which is inserted into the recess of the control part.

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The nut can be locked by means of a circlip, can be connected to the first half of the tool and can be rotated against it. This first tool half is preferably connected to the corresponding sub-disk by means of a plurality of screws, in particular a cylinder head screw. Preferably, the heads of the cylindrical head screws are inserted into the holes of the second sub-disk.

According to a further feature of the invention, the second half of the tool is connected via a plurality of screws to a ring on which the second sub-disk is mounted. In this ring, spring-actuated pins are preferably inserted which act on the front side of the first sub-disk. Thus, the two sub-disks of the composite cutting tool are held by a spring force at a predetermined axial distance.

In an alternative embodiment, i.e. the axially acting components of the centrifugal forces, balls are arranged between the first half of the tool and the second half of the tool, which, at the rotational speed of the circular saw, act on the first half of the tool. In this case, in particular, six balls can be mounted in an inclined upwardly open recess of the second tool half, the outer periphery of the balls being influenced by a partial region of the segment conical surface of the first tool half.

The other half of the tool can be clamped between the flange of the drive element and between the housing connected by means of a screw to the drive element.

Ex_121_on_drafts

The invention is described in more detail below by way of example 9.

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9 9 9 99 9 99 9 design in conjunction with drawing part.

Fig. 1 is a schematic side view of a circular saw for cutting with partial discs held by a spring force at a predetermined axial distance in section.

FIG. 2 shows an exemplary embodiment analogous to that of FIG. 1, in which the sub-disks are fixed at their predetermined axial spacing by the axially acting components of the centrifugal forces.

S12dY_provede 51-ΪΣ 0 úle £ u

The cut-off circular saw shown in FIG. 1 comprises a cutting tool 20 comprising two sub-disks 7 and 13, the first sub-disk 11 being connected to the first tool half 3 and the second sub-disk 13 being connected to the second tool half 16 The two tool halves 3 and 16 are connected to the driving element 2/7. In this case, the second half of the tool 16 is clamped between the flange 27 of the driving element 27 and between the housing 7, which is connected to the driving element 27 by means of a screw 8.

By means of the adjusting device which will be described in greater detail below, the first tool half 3 is axially displaceable relative to the second tool half 16 for adjusting the cutting width of the cutting tool 20, i.e. the axial spacing of the two disks 17 and 13.

According to the invention, the axially displaceable first half of the tool 3 is influenced by at least one

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Further, the first half of the tool 2 is connected to a nut which is axially adjustable against the second half of the tool 16 and is lockable, forming in the aforementioned adjusting device.

The second half of the tool 16 has a flange 22 which extends through the first half of the tool 3 and whose end region is provided with a thread 23 on which the nut 6 is mounted. Thus, the nut 6 on the thread 23 can move axially.

A control part 12 is connected to the nut 6 and is lockable to the first half of the tool 3 by means of at least one snap element 5.

The actuating part 12 is axially displaceable against the action of the at least one spring 11 and preferably accommodates two diagonally opposed cylindrical pins 5 'as latching elements. These cylindrical pins 5 'each pass through one through hole 26 in the flange 30 of the nut 6 at the front and are each insertable into the corresponding blind hole 25 of the first tool half 3. In this first tool half 3, a plurality of blind holes 25 are distributed. on its diameter pitch circle.

To support the spring 11, a support ring 10 is provided on the nut 6 opposite to the flange 30, which is secured by a circlip 9 and which forms a bearing surface for preferably two diagonally opposite springs 11 which act on the actuating part 12 ♦.

To secure the nut 6, it is connected by means of the circlip 4 to the first half of the machine 3 and is rotatable against this first half of the tool 3.

It can also be seen from FIG. 1 that the first half of the tool 3 is connected via a plurality of screws, in particular a cylindrical head screw 2, to the first sub-disk 1. The heads 2 of the head screws 2 are inserted into the holes 13 of the second sub-disk 13.

Similarly, to attach the first sub-disk X to the first half of the tool 3 by means of the cylinder head screws 2, the second sub-disk 13 is fixed to the ring 14 by the cylinder head screws 42, as shown in FIG. 2.

In addition, it can be seen from FIG. 1 that the second half of the tool 16 is connected to the ring 14 by means of a plurality of screws 15. The rings 14 accommodate springs 18 loaded with spring force connecting elements 17 which act on the front side of the first sub-disk.

The axial adjustment of the cutting width, i.e. the axial movement of the first sub-disc X relative to the second sub-disc 13, is carried out as follows.

The prerequisite here is that the drive element 27 is secured against rotation and that the cutting tool is rigidly connected to the element. In this case, the screw 8 and the sleeve 1 serve for this force-fastening of the cutting tool 20 on the drive element 27.

The control part 12 embraces the fingers and retracts against the pressure of the springs 11 in the X direction and is held in this position. When • 9 9

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10, the cylindrical pins 5 'protrude from the blind holes 25, so that the locking function is no longer available. It is now possible to rotate the actuating part 12. Since the cylindrical pins 5 'penetrate the flange 30 of the nut 6, it is also possible to rotate the nut 6 on the thread 23 of the second tool half 16 and thereby simultaneously displace the first tool half cylinder head. This displacement is caused by the circlip 4. The spring-shaped connecting elements 17 eliminate the thread play between the nut 6 and the second tool half 16 or the flange 22.

Once the functionally correct width of the two sub-disks 11 and 13 is formed, the cylindrical pins 5 'can snap back into the corresponding blind hole 25' by the action of the springs of the control part 12, which are moved back to the non-tensioned position.

The adjusting path corresponds to the relative axial distance change of the first sub-disc X relative to the second sub-disc 13. Thus, for circular saws, the groove width is changed. The changing slot s between the end face of the nut 6 and the sleeve 7 thus limits the maximum attainable notch width.

The embodiment of FIG. 2 differs from the embodiment of FIG. 1 in that preferably four compression spring-like connecting elements 17 are missing and six balls 17 are provided instead. These balls 17 are arranged between the first half of the tool 3 and between the second half of the tool 16 and, at the operating speed of the circular saw for cutting, affect the first half of the tool 3 and thus ensure the functionally correct spacing of the two partial disks X and 13. Preferably there are a total of six balls 17 ' • • · φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ φ no no no no v no no no by opening the recess 33 of the second tool half 16, and thus the outer circumference is influenced by the partial region of the sectional conical surface 35 of the first tool half 3.

These balls 17 ' generate a centrifugal force at the rotational speed of the cutting tool 20, which acts on the tapered surface 35 of the first tool half 3 and pushes it against the annular surface of the axially preset nut 6.

In this exemplary embodiment, there is the advantage of an easily accessible manually adjustable movement of the nut 6 via the actuating portion 12, since there is no spring force affecting the first tool half 3. Thus, the frictional force is in the thread 23 between the nut 6 and the flange 22 of the second tool half 16 preferably very small. The force retained by the two sub-disks 11 and 13 to perform their function when pushed away from one another in the intended deployment can advantageously be increased by centrifugal force in this embodiment compared to the embodiment of FIG.

In the exemplary embodiment of FIG. 2, cylindrical head screws 42 are screwed into the ring 14, whose heads 42 are inserted into the corresponding holes of the first sub-disk 10, analogously to the cylindrical head screws 2 and holes 13 ', but in a mirror-inverted manner.

In general, this results in a simply designed cutting tool 20 with two sub-disks χ and 13, in which the width of the cutting groove can be pre-set to the manual without the aid of the operating tool.

Claims (16)

Circular saw for cutting with a cutting tool (20) consisting of two sub-discs (1, 13), each sub-disc (1, 13) being arranged on one piece, connected together with the driving element (27), to the tool half (3) 16) and by means of an adjustable device the first tool half (3) is axially movable against the second tool half (16) for adjusting the cutting width of the cutting tool (20), characterized in that the axially movable first tool half (3) is operable by at least and is connected to the nut (6) axially adjustable and lockable against the second half of the tool (16). The circular saw according to claim 1, characterized in that the second tool half (16) has a flange (22) which passes through the first tool half (3) and whose end region is threaded (23) for axially moving the nut (6). ). Circular saw according to claim 1 or 2, characterized in that the control part (12), lockable by means of at least one latching element (5), is connected to the first half of the tool (3) by means of a nut (6). The circular saw according to claim 3, characterized in that the axially displaceable actuating part (12) has at least one cylindrical pin (5 *) as a latching element (12) against the action of the at least one spring (11) on the outer periphery of the nut (6). 5) that the cylindrical pin (5) is insertable into one of the blind holes (25) of the first half of the tool (3) and that the blind holes (25 *) are divided in the first one; - 13 to the half of the tool (3) in the same pitch circle diameter. The circular saw according to claim 4, characterized in that the blind holes (25) are arranged evenly distributed over the diameter of the pitch circle of the first tool half (3). Circular saw according to claim 4 and 5, characterized in that cylindrical pins (5), which are opposite to one another, are fastened diagonally to one another in the actuating part (12) and each pass through a through hole (26) in the flange (30) of the nut ( 6) and can be inserted into the corresponding blind hole (25) of the first tool half (3). Circular saw according to claim 4 and 6, characterized in that a support ring (10) secured by a spacer ring (9) is provided on the nut (6) opposite the flange (30), which forms a bearing surface for two diagonally opposite one another. a spring (11) acting on the actuating portion (12). Circular saw according to claim 7, characterized in that the support ring (10) has a guide surface (38) which is inserted into the recess (40) of the control part (12). Circular saw according to one or more of the preceding claims, characterized in that the nut (6) is secured by a circlip (4), is connected to the first half of the tool (3) and is rotatable relative thereto. 10. Circular saw according to one or more of the foregoing - 14 years, characterized in that the first tool half (3) and the second tool half (16) are connected to the corresponding sub-disk (1, 13) by means of a plurality of screws, in particular a cylindrical head screw (2; 42). The circular saw according to claim 10, characterized in that the heads (2 *, 42 *) of the cylindrical head screws (2, 42) are inserted into the holes (13 *, 43 *) of the opposite sub-disk (1, 13). The circular saw according to claim 1, characterized in that the second half of the tool (16) is connected via a plurality of screws (15) to the ring (14) on which the second sub-disk (13) is fixed. A circular saw according to claim 12, characterized in that the ring (14) houses spring-actuated pins (18) acting on the front side of the first sub-disk (1). Circular saw according to one or more of Claims 1 to 12, characterized in that balls (17 *) are arranged between the first tool half (3) and the second tool half (16) and act on the circular saw at an operating speed of the circular saw. the first half of the tool (3) and provide a functionally safe distance between the two disks (1, 13). Circular saw according to claim 14, characterized in that in particular six balls (17 *) are arranged in an inclined upwardly open recess (33) of the second half of the tool (16), the outer circumference of the balls (17) being influenced by the bead. - 15 by a partial area of a section conical surface (35) of the first tool half (3). Circular saw according to one or more of the preceding claims, characterized in that the second half of the tool (16) is clamped between the flange (27) of the driving element (27) and between the housing (7) connected by a screw (8). with driving element (27). &<- 1 ^X 6o ? / 2001 - • ♦ ·· ·· ·· ·· · P! ···. ···· ·· ·· '' 1 1/2 ........ J · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·