JPH07102523B2 - Clamping device for a saw saw machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a centering sleeve whose fastening end is insertable and an operating member for separating a saw blade, and is driven by a saw reciprocating stroke in a housing of a saw machine. Movable parallel to the longitudinal axis by means of a rod and having two protrusions at the clamping end,
TECHNICAL FIELD The present invention relates to a clamping device for a saw blade of a manually guided turning saw machine.

[0002]

2. Description of the Prior Art Such a clamping device is described in DE-A-3245359. There, the method of tightening the saw blade was unsatisfactory,
Causes incorrect cutting. This occurs especially when the saw blades have different thicknesses. A leaf spring is provided for pressing the saw blade, but this leaf spring cannot guarantee a stable central guidance of the saw blade when the load is greater and the thickness of the saw blade is different. A sliding body is supported by the slit of the housing as an operating member for separating the saw blade. In order to separate the saw blade, one must find a position where the slide can separate the saw blade from the centering sleeve. Furthermore, the tightening position of the saw blade cannot be obtained automatically. For this reason, it is also necessary to operate the sliding body.

US Pat. No. 3,823,473 describes a clamping device for the saw blade of a turning saw. However, these tightening devices are used for saw blades different from the saw blades described above,
That is, it is provided for a saw blade that is guided by a hole. Even if there is a difference in the thickness of the saw blade, the exact fitting condition due to the fitting connection is not guaranteed.

A tightening device for a turning saw, the saw blade end of which can be tightened or released by means of a push rod by means of an actuating element which is accessible from the outside, is a German patent application. No. 3006299. This allows the saw blade to be replaced quickly and without auxiliary tools. However, when the thickness of the saw blade is different, a deviation occurs between the longitudinal axis of the thrust bar and the longitudinal axis of the saw blade, and this deviation adversely affects the accuracy of saw cutting.

German Patent Application Publication No. 4102
No. 011 describes a clamping device for a turning saw. In this clamping device, the accuracy of saw cutting is improved by the centering sleeve, in which the clamping end of the saw blade can be clamped by the clamping sleeve. The actuating member is axially fixed by a clamping sleeve and is rotatable with respect to this clamping sleeve. The actuating member participates in the saw reciprocating stroke and, in some cases, in a pendulum swiveling saw, also in the pendulum movement. This is undesirable for the operation of a draw saw and involves some risk of injury.

Published German patent application No. 4102
A one-piece spring-loaded centering pin is supported in a centering sleeve according to 011 and which supports the end region of the clamping end of the saw blade. . There is inevitably play between the centering pin and the centering sleeve. This causes an undesired lateral movement of the saw blade. Such lateral movement reduces the accuracy of saw cutting.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to improve the operation of a revolving saw, in particular by ensuring that the operating member does not participate in the movement of the saw blade in spite of the exact tightening of the saw blade,
The aim is to propose a tightening device of the kind mentioned at the beginning.

[0008]

According to the invention, the object is to provide a clamping device of the type mentioned at the beginning with a clamping sleeve rotatably supported about its longitudinal axis. Due to the slope and spring,
Performing an axial movement to clamp the protrusion of the clamping end into the centering sleeve, the clamping member is rotatable by the operating member from the clamping position to the release position against the force of the spring, and the operating member is the housing. It is formed by a switching sleeve that is swingable about the longitudinal axis and is immovably supported in the axial direction. The gripping member of the switching sleeve protrudes from the hole of the housing, and the switching sleeve has a stopper edge. The stopper edge is at least as long as the saw reciprocating stroke in the axial direction, the stopper edge faces the operating cam of the clamping sleeve, and the clamping sleeve is moved from the clamping position when the gripping member is operated. It is resolved by rotating to the release position.

As a result, it is avoided that the actuating member, and thus the switching sleeve and the gripping member of this switching sleeve, are involved in the movement of the saw blade. The switching sleeve is free and remains stationary with respect to the clamping sleeve during the sawing operation. This reduces the risk of injury and improves the manipulability of the swivel saw and the manipulative member when the saw blade is fitted or replaced.

The invention has the further advantage that the saw blades are guided centrally by a mating connection, even if they have different thicknesses. This significantly improves the cutting accuracy of the turning saw machine.

In a pendulum-turning saw machine, an extension of the invention is that the switching sleeve has an inner wall area, the inner wall area being closer to the clamping sleeve than the other wall portions, the inner wall area being of the switching sleeve. It consists in pressing a pendulum-movable clamping sleeve against the end of the pendulum amplitude during operation. Thereby, the centering sleeve and the clamping sleeve for the fitting of the saw blade can be moved into a defined position of the saw reciprocating stroke, in which the saw blade can be easily fitted.

[0012]

Further advantageous configurations of the invention emerge from the subclaims and the following description of exemplary embodiments.

The hand guided swivel saw machine has a housing 1. Inside the housing, an electrically driven thrust rod 2 is provided. A clamping device 3 is provided on the tapping rod 2, which is driven by the tapping rod 2 in a saw reciprocating stroke S, and possibly additionally by a pendulum movement. The tightening device 3 has the saw blade 4 and the tightening end 5
It can be fixed with. The clamping end 5 is provided with two protrusions 6. The saw blade 4 is shown in two-dot chain lines in FIGS.

A centering sleeve 7 is provided on or configured on the push rod 2 for receiving the clamping end 5. The centering sleeve 7 has a male screw 8, and a tightening sleeve 10 is supported by the male screw via a female screw 9. These screws 8 and 9 form a bevel, which causes the fastening sleeve 10 to have a longitudinal axis L.
Is axially movable relative to the centering sleeve 7. A torsion spring 11 is provided between the centering sleeve 7 and the tightening sleeve 10.

The centering sleeve 7 is provided at its lower end with a wedge-shaped slope 12 for guiding the protrusion 6 (see FIG. 3). The clamping sleeve 10 has a lower edge 13,
This edge presses the projection 6 against the bevel 12 when the saw blade 4 is tightened.

In order to ensure that the upper end region 14 of the saw blade 4 is also supported, a centering pin, which is loaded by a compression spring 15, is supported in the centering sleeve 7, which pin comprises two It is formed by the centering pieces 16 and 17, and the centering pieces are in contact with the insertion portion 18 loaded by the compression spring 15. This insertion part 1
8 presses against the respective flanks 19 of the centering pieces 16, 17 while the centering pieces 16, 17 are pressed outwards. The centering pieces 16, 17 have guide surfaces 20, which are the flat parts 21 of the centering sleeve 7.
Is in contact with. Therefore, the alignment piece 16,
17 is supported in the centering sleeve 7 so as not to rotate about the longitudinal axis L. The guide surface 20 is guided in the centering sleeve 7 without play by means of a compression spring 15 acting on the bevel 19 via the insert 18.

A separate bevel 22 is provided on both centering pieces 16, 17 for supporting the end region 14.
These bevels can accommodate saw blades of different thickness between them. The wedge-shaped notches 23 (see FIG. 2) of the centering pieces 16, 17 are used to receive the end region 14 of the clamping end 5.

In order to prevent both centering pieces 16, 17 from moving relative to each other in the axial direction, one centering piece 1
6, 17 are the other centering pieces 17, 1 via the ridges 24.
It engages with the notch 25 of 6. The flanges 26 of the centering pieces 16, 17 limit the axial movement of these centering pieces. The projections 16 ′, 17 ′ guide the alignment pieces 16, 17 in the alignment sleeve 7 and these alignment pieces 1
Helps to insert the end region 14 of the saw blade 4 between 6,17.

A switching sleeve 27 is rotatably provided in the housing 1 as an operating member for the tightening sleeve 10. The rotation axis D of the switching sleeve is located slightly eccentric to the vertical axis L and is parallel to the vertical axis L (see FIG. 4). A grip member 28 is formed on the switching sleeve 27, and the grip member has a hole 29.
And protrudes from the end surface of the housing 1.

The switching sleeve 27 has a notch 30 whose one end wall forms a stopper edge 31. The stopper edge 31 extends parallel to the longitudinal axis L over a section longer than the saw reciprocating stroke S.
The operation cam 32 of the tightening sleeve 10 faces the stopper edge 31.

A tension spring 33 acts on the switching sleeve 27. Since the wall 34 of the switching sleeve 27 is formed in an oval shape, the clamping sleeve 10 inside the switching sleeve 27 is free to move, even if the clamping sleeve also performs a pendulum movement in addition to the saw reciprocating stroke. it can. This is indicated by the chain double-dashed line in FIG. The inner wall region 35 of the wall 34 is closer to the clamping sleeve 10 than the wall 34 in the range of the pendulum movement.

The manner of operation of the above-described device is approximately as follows. 2 and 3 the clamping sleeve 10 is shown in the clamping position. In this position the clamping sleeve is twisted upwards by means of the torsion spring 11 by means of the screws 8, 9, so that the edge 13 of the clamping sleeve presses the projection 6 of the saw blade 4 upwards against the bevel 12. As a result, the saw blade 4 is securely tightened regardless of its thickness. End area 1 of saw blade 4
4 is held radially without play by the centering pieces 16, 17, which are guided in the centering sleeve 7 in the radial direction without play. As a result, the end area 14 of the saw blade 4 is not displaced by the lateral load of the saw blade 4 during cutting. This improves cutting accuracy. During the sawing operation, the switching sleeve 27 is in the non-operated position (see FIG. 4). In this position, the clamping sleeve 10 or the operating cam 32 of this clamping sleeve does not come into contact with the switching sleeve 27 either during the saw reciprocating stroke performed in the direction of the longitudinal axis L or during the additional pendulum movement stroke. The switching sleeve 27 is held in this position by a tension spring 33, the gripping member 28 hitting the edge of the hole 29.

When the saw blade 4 is to be replaced, the grip member 28 is swung in the direction of arrow A (see FIG. 4). At that time, the switching sleeve 27 rotates about the rotation axis D against the force of the tension spring 33. During this rotary movement, the stopper edge 31 hits the operating cam 32 regardless of where the saw reciprocating stroke S of the operating cam 32 is, so that, as shown in FIG. Rotate 10 against the force of torsion spring 11 to the release position. During rotation of the switching sleeve 27, the inner wall region 35 of this switching sleeve hits the circumference of the clamping sleeve 10 on the side opposite to the hole 29, so that this clamping sleeve is necessarily close to the hole 29 and the front end point of the pendulum amplitude. Be moved to.

At the release position of the tightening sleeve 10,
Since the edge 13 is separated from the protruding portion 6 of the saw blade 4, the saw blade 4
Can be easily withdrawn. When the gripping member 28 is released, it moves, with which the switching sleeve 27 returns to the position shown in FIG. The tightening sleeve 10 moves under the action of the torsion spring 11, with which the operating cam 32 returns by itself to the position shown in FIG.

When a new saw blade 4 is to be fitted,
The gripping member 28 causes the switching sleeve 27 to rotate again, so that the clamping sleeve 10 is once again in the release position. This allows the saw blade 4 to be inserted into the centering sleeve 7. The end region 14 of the saw blade reaches between the centering pieces 16, 17 and the projection 6 of the saw blade strikes the bevel 12. After that, since the grip member 28 is released, the switching sleeve 2
The stopper edge 31 of 7 is separated from the operation cam 32 by the action of the tension spring 33. The switching sleeve 27 rotates under the action of the torsion spring 11 so that the edge 13 comes under the projections 6 and clamps these projections axially on the bevel 12.
The saw machine is thereby ready for operation again. The thickness of the saw blade 4 determines the rotational angular position of the operation cam 32 with respect to the stopper edge 31 in the notch 30.

It is also possible to form the centering pieces 16, 17 integrally. The joint between these centering pieces 16, 17 is elastic due to the outward preload.

Each saw blade 4 is positioned with the protrusion 6 at the center between the slopes 12 regardless of the thickness. In the upper end region 14 of the clamping end 5, the saw blade 4 is additionally held on spring-loaded centering pieces 16, 17 or on the bevel 22 of these centering pieces. This saw blade is held non-rotatably around the longitudinal axis L and without play.

For positioning the saw blade 4, it is also advantageous that the holding force of the torsion spring 11 is promoted by frictional resistance. Therefore, the torsion spring 11 need only be applied with a relatively small torque in order to achieve the desired tightening of the saw blade 4.

It is also advantageous for the user to be able to operate the switching sleeve at each stroke position of the saw blade without risk of injury and to return to a reliable starting position without difficulty. In principle,
The saw blade 4 can be released as long as the claw 2 is still moving.

A switching sleeve is not shown in the embodiment according to FIGS. 6 and 7. As in the case of the exemplary embodiment according to FIGS. 1 to 4, the operating cam 32 of the clamping sleeve 10 engages in the cutout of the switching sleeve. The parts corresponding to FIGS. 1 to 4 are given the same reference numerals.

The centering pieces 16, 17 are supported on pins 36 and guided in the centering sleeve 7 in a non-rotatable manner. The pin 36 passes through the opening 37 of the centering sleeve 7 at both ends and the annular passage 3 of the clamping sleeve 10.
Engage 8. Each centering piece 16, 17 has a bevel 22 which extends wedge-shaped to receive the end region 14 of the clamping end 5 of the saw blade 4. Thereby, the centering pieces 16, 17 can hold saw blades of different thicknesses between them (see FIG. 7). A wedge-shaped inclined surface 12 for supporting the protruding portion 6 of the saw blade 4 is formed in the lower portion of the centering sleeve 7.

The manner of operation of the embodiment according to FIGS. 6 and 7 is roughly as follows. During operation, the saw blade 4 is centered irrespective of its thickness and is tightly clamped in play-free mating connection and non-rotatably about the longitudinal axis L. In the tightened state, the tightening sleeve 10 is rotated by the torsion spring 11 along the screws 8 and 9 with respect to the centering sleeve 7. In doing so, the upper edge of the annular passage 38 pushes the pin 36 downwards, which in the longitudinal direction L clamps the bevel 22 of the centering pieces 16, 17 in the wedge-shaped notch 23 of the centering pieces 16, 17. Edge 5
Press against. Thereby, the protrusion 6 is pushed into between the wedge-shaped bevels 12 of the centering sleeve 7. As a result of the reaction to the clamping force acting on the clamping end 5, both centering pieces 16, 17 contact the inside of the centering sleeve 7 without play.

When the saw blade 4 is to be replaced, the clamping sleeve 10 is rotated relative to the centering sleeve 7, as described in the embodiment according to FIGS. This clamping sleeve rises in the longitudinal direction L along the screws 8, 9 against the action of the torsion spring 11 and the annular passage 3
The lower edge of 8 carries a pin 36 which pulls the centering pieces 16, 17 out of the end region 14 of the clamping end 5. The saw blade 4 can now be removed from the bevel 12 and from the centering sleeve 7 after rotation of approximately 90 °. Then another saw blade can be fitted, whether it is thicker or thinner, again in the manner described above with the torsion spring 1
Under the action of 1, they are joined together, aligned,
Tightened without play.

In the embodiment according to FIGS. 1 to 7, the gripping member 28 is located in the housing 1 relatively close to the saw blade 4 (see FIG. 1). In contrast, in the exemplary embodiment according to FIGS. 8 and 9, the switching sleeve 27 and the gripping member 28 of this switching sleeve are provided in the housing 1 further away from the saw blade 4. The centering sleeve 7 extends upward in the housing 1 one by one. A protrusion 39 is mounted on the outside of the centering sleeve 7 for driving by the push rod 2.

The clamping sleeve 10 is supported on the upper end of the centering sleeve 7 by means of screws 8, 9. The extension 40 of the clamping sleeve 10 extends downwardly into the centering sleeve 7 and has a receiving head 41 for the wedge-shaped end region 14 of the clamping end 5 of the saw blade 4. The receiving head 41 is formed with a funnel-shaped conical recess 42 which is fitted to the wedge-shaped end area 14.

The receiving head 41 is supported in the centering sleeve 7 by means of a sealing ring 43. Alignment sleeve 7
Has a wedge-shaped slope 12 for supporting the protrusion 6. The torsion spring 11 acts on the receiving head 41 and the centering sleeve 7.

During operation, the recess 42 of the receiving head 41 is acted upon by the torsion spring 11 and the screws 8, 9 to tighten the clamping end 5
Is pressed against. The clamping end is fixed by a mating connection. As a result, the protrusion 6 is also pressed between the slopes 12.

In order to replace the saw blade 4, the switching sleeve 27 is rotated, which entrains the clamping sleeve 10. Thereby, the receiving head 41 is separated from the clamping end, so that the saw blade 4 can be replaced as described above.

In the embodiment according to FIGS. 10 and 11, parts corresponding to the parts described above are given the same reference numerals.
A compression spring 15 provided in the centering sleeve 7 presses the centering pins, which form both centering pieces 16, 17 which are located above the clamping end 5. It has a slope 22 for tightening the end region 14.

A lateral pin 44 is provided on the centering sleeve 7, and two arms 45 and 46 are swingably supported on the lateral pin. Each arm 45, 46 has a fastening piece 47 for each of the protrusions 6 of the saw blade 4 at the end opposite to the lateral pin 44. These fastening pieces 47 have a receiving portion 48 for the protrusion 6 on the inside and a curved portion 49 on the outside. The conical inner wall 50 of the tightening sleeve 10 corresponds to these curved portions 49.

Slopes 51 are provided on the ends of the arms 45 and 46 on the side opposite to the fastening piece 47, and the compression springs 52 press against these slopes, and the compression springs are attached to the flange 53 of the centering pin. Supported.

The manner of operation of the embodiment according to FIGS. 10 and 11 is roughly as follows. In the tightening position (see FIGS. 10 and 11), the conical inner wall 50 presses the receiving part 48 of the tightening piece 47 via the projection 6 and these projections 6
By which it is held without play. Compression spring 1
5 is the slope 2 of the centering pieces 16 and 17 as described above.
2 is pressed into the end region 14 of the clamping end 5. Thereby the saw blade 4 is clamped as desired without play and non-rotatably.

To replace the saw blade 4, the clamping sleeve 10 is moved upwards against the force of the spring 11.
At this time, the conical inner wall 50 releases the fastening piece 47. Since the arms 45 and 46 swing outward due to the compression springs 52 acting on the slope 51, the fastening pieces 47 can independently project the protrusions 6.
Get away from. The saw blade 4 can now be removed or replaced without rotation. Otherwise, reference is made to the above description.

Other embodiments obtained by combining the partial features mentioned in the above embodiments are also within the scope of the present invention. For example, the spring 11 need not be a torsion spring. The spring may be a compression spring. In this case, the clamping sleeve or the switching sleeve can be moved manually into the clamping position.

[Brief description of drawings]

FIG. 1 is an explanatory view of a turning saw machine with a range of a tightening device cut out.

2 is a longitudinal sectional view of the tightening device, which is enlarged from FIG. 1. FIG.

FIG. 3 is a vertical sectional view taken along the line III-III in FIG.

FIG. 4 shows the switching sleeve in the unactuated position,
FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2.

5 is a cross-sectional view corresponding to FIG. 4 in the operated position of the switching sleeve.

FIG. 6 is a vertical cross-sectional view of another embodiment.

7 is a cross-sectional view taken along the line VII-VII of FIG.

FIG. 8 is a vertical cross-sectional view of another embodiment.

9 is a partial cross-sectional view taken along the line IX-IX in FIG.

FIG. 10 is a vertical cross-sectional view of another embodiment.

11 is a sectional view taken along line XI-XI in FIG.

[Explanation of symbols]

 1 Housing 2 Cutter 4 Saw Blade 5 Tightening End 6 Projection 7 Centering Sleeve 8 Male Thread 9 Female Thread 10 Tightening Sleeve 11 Torsion Spring 27 Switching Sleeve 28 Gripping Member 29 Hole 31 Stopper Edge 32 Operation Cam L Vertical Axis S Saw Reciprocating Stroke

Claims (14)

[Claims] 1. A saw having a centering sleeve (7) into which a tightening end (5) can be inserted and an operating member for separating a saw blade (4) are driven by a saw reciprocating stroke in a housing of a saw machine. Hand guided swivel saw movable by means of a thrusting rod (2) parallel to the longitudinal axis (L) and having two protrusions (6) at the clamping end (5). A clamping device for a saw blade (4) of a machine is provided with a clamping sleeve (10) rotatably supported about a longitudinal axis (L), which clamping sleeve comprises a bevel (8, 9) and a spring. By means of (11), the protrusion of the tightening end (5) is axially moved into the centering sleeve (7), and the operating member causes the tightening sleeve (10) to move from the tightening position to the spring (11). It can be rotated to the release position against the force of A switching sleeve (27) in which a member is supported in the housing (1) so as to be swingable about a longitudinal axis (L) and not axially movable.
The gripping member (28) of the switching sleeve (27) projects from the hole (29) of the housing (1), and the switching sleeve (27) is formed by the stopper edge (3).
1), the stopper edge is at least as long as the saw reciprocating stroke (S) in the axial direction, and the stopper edge (31) is the operating cam (32) of the tightening sleeve (10).
For a saw blade of a manually guided swivel saw machine, characterized in that the clamping sleeve (10) is opposed to and is rotated during operation of the gripping member (28) from a clamping position to a releasing position. Tightening device. 2. Fastening device according to claim 1, characterized in that the axis of rotation (D) of the switching sleeve (27) is parallel to the longitudinal axis (L). 3. A return spring (3) is attached to the switching sleeve (27).
3) The tightening device according to claim 1 or 2, characterized in that: 4. The return spring (33) has a switching sleeve (2).
4. Fastening device according to claim 3, characterized in that 7) is moved to an inoperative position, in which position the stopper edge (31) is separated from the operating cam (32). 5. The switching sleeve (27) has an inner wall area (3).
5), the inner wall region being closer to the clamping sleeve (10) than the other wall parts, this inner wall region (35) being capable of pendulum movement when operating the switching sleeve (27). 10. The clamping device according to claim 1, characterized in that 10) is pressed against the end point of the pendulum amplitude. 6. Clamping device according to claim 5, characterized in that the cross section of the wall of the switching sleeve (27) is oval. 7. Clamping device according to claim 2, characterized in that the axis of rotation (D) lies between the longitudinal axis (L) and the inner wall region (35). 8. The end region (14) of the clamping end (5) of the saw blade (4) engages an aligning pin which is elastically supported in an aligning sleeve (7), 2. Alignment pin, characterized in that it comprises two alignment pieces (16, 17) which are pressed against the alignment sleeve (7) by a spring (15) without play. The tightening device according to one of 1 to 7. 9. Arrangement according to claim 8, characterized in that the centering pieces (16, 17) are guided in the centering sleeve (7) non-rotatably about the longitudinal axis (L). Tightening device. 10. The centering pieces (16, 17) consist of one part, the connection being elastic, the centering pieces (16, 17) being assembled by an outward preload. The tightening device according to claim 8, wherein: 11. The torsion spring acting between the clamping sleeve (10) and the centering sleeve (7) is a torsion spring (11).
1 in one of claims 1 to 10, characterized in that
The tightening device described in 1. 12. The clamping sleeve (10) is axially entrained with two centering pieces (16, 17) for the end region (14) of the clamping end (5) when the clamping sleeve (10) is moved. A fastening device according to any one of claims 1 to 11, wherein: 13. The clamping sleeve (10) has a receiving head (41) with a funnel-shaped recess (42) for receiving the wedge-shaped end region (14) of the clamping end (5). Clamping device according to one of claims 1 to 12, characterized in that 14. An arm (45, 46) having a fastening piece (47) is swingably supported in the centering sleeve (7), and these fastening pieces (47) are attached to the fastening sleeve (10). Tightening device according to one of claims 1 to 13, characterized in that it can be pressed against the projection (6).