Saw blade clamping device

Abstract

Saw blade clamping device (100) for a saw performing a linear reciprocating movement, characterized in that at least two types of saw blades (10, 20) can be clamped by the saw blade clamping device (100) and it comprises a receiving block (30) with a connecting part (31) driven by the saw performing the linear reciprocating movement and a receiving part (32) extending from the connecting part (31) and provided with a receiving groove (35); an actuating element (80) comprising an actuating part (81) and, at both ends of the actuating part (81), a mounting end (83) and a receiving end (82), respectively, wherein the actuating part (81) with the mounting end (83) can be pushed onto the receiving part (32) of the receiving block (30) and the receiving end (82) is provided with a receiving opening (820); and a pressure medium between the actuating element (80) and the receiving block (30), wherein the pressure medium has pressure ends which can be inserted into the receiving groove (35); wherein the actuating element (80) is rotatable relative to the receiving part (32) and is provided in an inner wall (84) with drive surfaces (842, 843) designed as curved surfaces, wherein the pressure means is provided with drive ends which can be pressed against the drive surfaces (842, 843), which, upon rotation of the actuating element (80), moves the pressure ends of the pressure means in the direction into the receiving groove (35) in order to press-fasten the inserted saw blade (10; 20); and that the pressure medium comprises a U-profile (40) and a fastening pin (50), wherein the U-profile (40) comprises a nose (410) arranged on a U-profiling (41) and two legs (42) extending from the U-profiling (41), and the fastening pin (50) comprises a first end (52) and a second end (53), wherein the nose (410) and the second end (53) serve as drive ends of the pressure medium and the ends of the legs (42) and the first end (52) serve as pressure ends of the pressure medium.

Description

Technical area

[0001] The invention relates to a saw blade clamping device for a hand-held power tool, in particular a saw blade clamping device for a hand-held saw performing a linear reciprocating movement, by means of which two types of saw blades can be clamped. State of the art

[0002] Fig. 1a and Fig. Figure 1b shows a saw blade clamping device 100' for a hand-held, linear reciprocating saw. The saw blade clamping device can clamp both a jigsaw blade 10 and a reciprocating saw blade 20, which are arranged as shown in Fig. 2, which have different clamping shafts. The saw blade clamping device 100' comprises a first clamping plate 30', a second clamping plate 40', a first drive 50', a second drive 60', and a fastening pin 31' mountable in the first clamping plate 30'. The second clamping plate 40' is provided with a recess 41' that is in positive engagement with the clamping shaft 11 of the jigsaw blade 10.

[0003] The first drive 50' and the second drive 60' enable clamping of the first clamping plate 30' with the second clamping plate 40'. When the jigsaw blade 10 is inserted into the clamping device 100', the clamping shaft 11 of the jigsaw blade 10 is located in the recess 41' of the second clamping plate 40', and the first clamping plate 30' is clamped to the second clamping plate 40' by the first drive 50' and the second drive 60', so that the jigsaw blade 10 is clamped in the clamping device 100'. When the reciprocating saw blade 20 is inserted into the clamping device 100', the fastening pin 31' projects through a through-opening 32' in the first clamping plate into a bore 22 in the clamping shaft 21 of the reciprocating saw and the first clamping plate 30' is clamped to the second clamping plate 40' by the first drive 50' and the second drive 60', so that the reciprocating saw blade 20 is clamped in the clamping device 100'.

[0004] The clamping device 100' has the disadvantage that it is difficult for an operator to reach the correct position when inserting the respective saw blade, so that the first drive 50' and the second drive 60' do not allow the first clamping plate 30' to be clamped to the second clamping plate 40'.

[0005] Therefore, the problem must be solved.

[0006] Furthermore, for example, DE 10 2007 026 444 A1 describes a hand-held reciprocating saw with a clamping device for a tool, wherein the clamping device, in particular on a centering piece, has an insertion slot for a shaft of the tool and a transverse channel running transversely to the insertion slot and opening into it, with a clamping body which is displaceable in the transverse channel and which dips into the insertion slot at one end and in particular protrudes therefrom at the other end, for clamping the shaft, and wherein the clamping device, in particular the centering piece, has a rotatable clamping sleeve with a clamping curve which displaces the clamping body, in particular with a tension spring which acts on the clamping sleeve and seeks to rotate the clamping sleeve in a specific direction of rotation.US 2009 / 0 273 146 A1 describes a clamping device for a reciprocating tool having a reciprocating spindle with a central axis and at least one radially aligned opening and a receiving slot at its front end for receiving a tool accessory having a shank portion with a hole at one end and a working portion, the shank being configured to be inserted into the slot, the device being adapted to be attached to the spindle, the device having an unclamped position and a clamped position.DE 10 2004 042 026 A1, for example, describes a clamping device for the tool-free clamping of saw blades with a clamping shank for a handheld power tool, in particular a hand-held reciprocating saw, comprising two clamping parts that can be pressed against one another, each with a support surface for a clamping shank of a saw blade that can be accommodated between the clamping parts. At least one of the clamping parts is displaceable relative to the other for clamping and releasing the clamping shank, wherein the displacement of the at least one clamping part is derived from a sliding or rotating movement of an independent, manually movable actuating member. Furthermore, WO 2010 / 002 527 A2 describes improved methods and devices for securing a surgical tool, such as a cutting blade, in a reciprocating surgical instrument, such as a saw.Cutting blades and other surgical tools with flat, round, or other shank profiles are described. A chuck is described as an example for attaching a surgical tool with a shank with a mounting opening in a reciprocating surgical instrument. Description of the invention

[0007] The object of the invention is to provide a structurally simple and easy-to-use saw blade clamping device for a hand-held saw performing a linear reciprocating movement.

[0008] For this purpose, according to the invention, a saw blade clamping device for a saw which performs a linear reciprocating movement is proposed, by means of which at least two types of saw blades can be clamped and which comprises a receiving block with a connecting part which is driven by the saw which performs the linear reciprocating movement and a receiving part which extends from the connecting part and is provided with a receiving groove, an actuating element comprising an actuating part and at both ends of the actuating part a mounting end ora receiving end, wherein the actuating part with the mounting end can be pushed onto the receiving part of the receiving block and the receiving end is provided with a receiving opening, and a pressure medium between the actuating element and the receiving block, wherein the pressure medium has pressure ends that can be inserted into the receiving groove, wherein the actuating element is rotatable relative to the receiving part and is provided in an inner wall with drive surfaces designed as curved surfaces, wherein the pressure medium is provided with drive ends that can be pressed against the drive surfaces, which, when the actuating element is rotated, moves the pressure ends of the pressure medium in the direction into the receiving groove.The pressure means comprises a U-profile and a fastening pin, wherein the U-profile comprises a nose arranged on a U-profiling and two legs extending from the U-profiling and the fastening pin comprises a first end and a second end, wherein the nose and the second end serve as drive ends of the pressure means and the ends of the legs and the first end serve as pressure ends of the pressure means.

[0009] Furthermore, the saw blade clamping device according to the invention facilitates operation due to the actuating element with drive surfaces. Therefore, the saw blade clamping device of the invention is user-friendly.

[0010] Therefore, the invention provides an advantageous choice for users. Brief presentation of the drawings Fig. 1a shows a spatial representation of a saw blade clamping device in the prior art; Fig. 1b shows a spatial representation of a saw blade clamping device in the prior art; Fig. 2 shows main views of a jigsaw blade and a reciprocating saw blade; Fig. 3a shows a spatial representation of a saw blade clamping device of the invention; Fig. 3b shows a spatial representation of the saw blade clamping device of the invention; Fig. 4 shows a sectional view and a main view of the saw blade clamping device of the invention in the initial position; Fig. 5 shows a sectional view and a main view of the saw blade clamping device of the invention in the receiving position; Fig. 6 shows a sectional view and a main view of the saw blade clamping device of the invention when receiving a reciprocating saw blade; Fig. 7 shows a spatial representation of the saw blade clamping device of the invention when holding a reciprocating saw blade; Fig. Fig. 8 shows a sectional view and a main view of the saw blade clamping device of the invention when receiving a jigsaw blade; Fig. 9 shows a spatial representation of the saw blade clamping device of the invention when holding a jigsaw blade. Embodiments

[0011] The principle of the saw blade clamping device according to the invention is described below with reference to the drawings.

[0012] The invention relates to a saw blade clamping device 100, essentially for a hand-held saw with a linear reciprocating motion, such as a jigsaw or a reciprocating saw. The saw blade clamping device accommodates a saw blade so that the hand-held saw with a linear reciprocating motion can perform a cut.

[0013] How Fig. As shown in Figure 2, the jigsaw blade 10 and the reciprocating saw blade 20 have different clamping shank shapes. The saw blade clamping device 100 of the invention can accommodate both the clamping shank 11 of the jigsaw blade 10 and the clamping shank 21 of the reciprocating saw blade 20.

[0014] How Fig. 3a and Fig. 3b, the saw blade clamping device 100 of the invention comprises a support block 30, a pressure means with a U-profile 40 and a fastening pin 50, an elastic element 60, a holder 70 and an actuating element 80.

[0015] The support block 30 comprises a cylindrical connecting part 31 that can be connected to a lifting rod of the hand-held saw that performs a linear reciprocating movement, so that a saw blade clamped in the clamping device 100 is set in a linear reciprocating movement to perform a cutting task. A cylindrical receiving part 32 is formed by an elongated extension of the cylindrical connecting part 31. A stop 36 is provided between the connecting part 31 and the receiving part 32. The stop 36 is designed as a circular ring on the cylinder body and has a cross-section that is larger than that of the connecting part 31 or the receiving part 32. The receiving part 32 comprises a first clamping piece 33 and a second clamping piece 34. A receiving groove 35 is provided between the first clamping piece 33 and the second clamping piece 34.The first clamping piece 33 and the second clamping piece 34 are both semi-cylindrical and lie opposite one another. The receiving groove 35 is formed by a plane between the first clamping piece 33 and the second clamping piece 34. An opening 350 of the receiving groove 35 is formed at the free end of the first clamping piece 33 and the second clamping piece 34. Opposite recesses 330 are provided on both sides of the first clamping piece 33. The recesses 330 are connected to the receiving groove 35. In the central region of the second clamping piece 34, a through-hole 340 is provided through the second clamping piece 34. The through-hole 340 is connected to the receiving groove 35.

[0016] The U-profile 40 comprises a U-profiling 41 and parallel legs 42 extending from both ends of the U-profiling 41. A nose 410 is provided in the central region of the U-profiling 41. The U-profile 40 is placed on the first clamping piece 33, with the legs 42 of the U-profile 40 being received in the recesses 330 of the first clamping piece 33, and the ends 420 of the two legs 42 being pressed against a plane of the second clamping piece 34, thus forming pressure ends.

[0017] The fastening pin 50 comprises a cylindrical pin body 51 and a first end 52 and a second end 53, which form the ends of the pin body 51 and each have a cross-section that tapers from the pin body 51. The fastening pin 50 is received in the through-hole 340 of the second clamping piece 34. The distance between the first end 52 and the second end 53 of the fastening pin 50 is greater than the sum of the widths of the receiving groove 35 with the greatest thickness of the second clamping piece 34. The first end 52 of the fastening pin 50 is pressed through the second clamping piece 34 against a plane of the first clamping piece 33.

[0018] The elastic element 60 is a coil spring capable of providing elastic force in its spiral direction. It comprises a coil body 61, a first fastening foot 62, and a second fastening foot 63. The elastic element 60 is pushed onto the receiving part 32 and rests against the stop 36, with the second fastening foot 63 being received in the receiving groove 35 at the furthest inner end of the receiving groove 35 opposite the opening 350.

[0019] The holder 70 is hollow-cylindrical and comprises a cylinder body 71. A cutout 710 and an opening 711 are provided on the cylinder body 71. The cylinder body is pushed onto the receiving part 32. The cutout 710 on the cylinder body 71 is then assigned to the recess 330 of the first clamping piece 33, and the opening 711 is assigned to the through-hole 340 of the second clamping piece 34. The U-profile 40 is mounted onto the first clamping piece 33 through the cutout 710 of the holder 70. The fastening pin 50 is received through the opening 711 into the through-hole 340 of the second clamping piece 34.

[0020] The actuating element 80 is hollow-cylindrical and comprises an actuating part 81 arranged on the cylinder body, a receiving end 82 arranged at both ends of the actuating part 81, and a mounting end 83. An opening is formed at the mounting end 83. The actuating element 80 is pushed onto the receiving part 32 by means of the mounting end 83, onto which the U-profile 40, the fastening pin 50, the elastic element 60, and the holder 70 are already mounted. An inner wall of the actuating element 80 is provided with a slot 840 for receiving the first fastening foot 62 of the elastic element 60. The nose 410 of the U-profile 40 and the second end 53 of the fastening pin rest against the inner wall 84 of the actuating element 80 and can slide along the surface of the inner wall 84. The inner wall 84 is provided with a first drive surface 842 formed as a curved surface and a second drive surface 843.The first drive surface 842 includes a beginning 841. The second drive surface 843 includes an end 844. The first drive surface 842 is arranged opposite the second drive surface 843 in the inner wall 84 of the actuating element 80, along a direction opposite that shown in . Fig. 4. The first drive surface 842 and the second drive surface 843 are each formed by a change in wall thickness in the inner wall 84 of the actuating element 80. The beginning 841 is located at the point with the greatest wall thickness of the first drive surface 842. The end 844 is located at the point with the smallest wall thickness of the second drive surface 843. The actuating element 80 can be rotated by the actuating part 81. The actuating element 80 can be reset after rotation by means of an elastic force of the elastic element 60. The actuating element 80 is arranged coaxially with the receiving part 32 and can be reset about a central axis. The actuating element 80 is provided at the receiving end 82 with a receiving opening 820 consisting of a first opening segment 821 and a second opening segment 822.The first opening segment 821 is formed by two opposite arcuate surfaces that have the same radius and the same radian measure. The second opening segment 822 is also formed by two opposite arcuate surfaces that have the same radius and the same radian measure. The first opening segment 821 and the second opening segment 822 have a common center of symmetry O. The lines of symmetry of the first opening segment 821 and the second opening segment 822 form an angle B with each other. An effective receiving opening 820 formed by the first opening segment 821 has a greater width than an effective receiving opening 820 formed by the second opening segment 822. The first opening segment 821 and the second opening segment 822 can be formed as a slot that allows insertion of the clamping shaft of the saw blade, or in another form.The width of the effective receiving opening refers to the largest width of the first opening segment 821 or second opening segment 822 when they overlap with the opening 350 of the receiving groove 35. The first opening segment 821 and the second opening segment 822 each have a radian dimension that is greater than the width of the opening 350 of the receiving groove 35.

[0021] Fig. 4 shows the saw blade clamping device 100 of the invention in a starting position. The nose 410 of the U-profile 40 rests against the beginning 841 of the first drive surface 842. The ends 420 of its legs 42 extend into the receiving groove 350 and are pressed against the plane of the second clamping piece 34. Of course, a clearance can remain between the ends 420 and the plane of the second clamping piece 34, said clearance having a width smaller than the thickness of the thinnest saw blade of the aforementioned saw blades. The fastening pin 50 extends with a first end 52 into the receiving groove 35 and is pressed with a second end 53 against the second drive surface 843 at a point where the wall thickness is at its smallest. The second opening segment 822 and the opening 350 of the receiving groove 35 intersect. The beginning 841 prevents the actuating element from rotating in a direction opposite to direction A.The elastic element 60 provides the actuating element 80 with a preload in the direction opposite to direction A. By means of the preload, the beginning 841 of the actuating element 80 and the nose 410 are pressed against each other, so that the saw blade clamping device 100 is in the position shown by . Fig. 4 shown starting position is held.

[0022] When the operator rotates the actuating element 80 in direction A during actuation using the actuating part 81, the actuating element 80 is rotated in direction A relative to the receiving part 32. The nose 410 and the second end 53 each slide along the first drive surface 842 and the second drive surface 843, respectively. The wall thickness of the first drive surface 842 and the second drive surface 843 changes in direction A according to the aforementioned curved surface. This sliding creates a space that allows the U-profile 40 and the fastening pin 50 to move away from the first clamping piece 33 and the second clamping piece 34, respectively. Fig. 5 shows the saw blade clamping device 100 in a receiving position. The second end 53 of the fastening pin 50 is pressed against the end 844, preventing further rotation of the actuating element 80 in direction A. The ends 420 of the legs 42 and the first end 52 of the fastening pin 50 leave the receiving groove 350. The first opening segment 821 and the opening 350 of the receiving groove 35 intersect.

[0023] In this case, a saw blade to be inserted can be accommodated in the saw blade clamping device 100 of the invention. When the reciprocating saw blade 20 is to be accommodated, the clamping shaft 21 of the reciprocating saw blade 20 is inserted into the receiving opening 820. Since the actuating element 80 is in the receiving position, the clamping shaft 21 of the reciprocating saw blade 20 is inserted into the receiving groove 350 through an effective receiving opening formed by an intersection of the first opening segment 821 and the opening 350 of the receiving groove 35.

[0024] During insertion, the U-profile 40 and the fastening pin 50 move away from the first clamping piece 33 and the second clamping piece 34, respectively. After the clamping shaft 21 of the reciprocating saw blade 20 is inserted into the appropriate position, the actuating element 80 is released so that it rotates in the direction opposite to direction A by means of an elastic force of the elastic element 60. During rotation, the ends 420 of the U-profile 40 and the first end 52 of the fastening pin 50 protrude into the receiving groove 350 under the drive of the first drive surface 842 and the second drive surface 843 of the actuating element 80. When the actuating element 80 is turned back into the clamping position, both ends 420 of the U-profile 40 are pressed against both sides of the clamping shaft 21 of the reciprocating saw blade 20 and the first end 52 of the fastening pin 50 projects into a round opening 22 in the clamping shaft.The clamping shaft 21 of the reciprocating saw blade 20 is located in the first opening segment 821 of the receiving opening 820. As . Fig. As shown in Figure 7, the inner diameter of the holder 70 corresponds to the width of the clamping shaft 21 of the reciprocating saw blade 20. After the clamping shaft 21 of the reciprocating saw blade 20 is inserted into the receiving groove 35, the holder 70 prevents the reciprocating saw blade 20 from vibrating in the transverse direction. The radian dimension of the first opening segment 821 is larger than the pivoting play for the actuating element 80 to prevent the ends 420 and the first end 52 from not entering the correct positions due to the first opening segment 821 preventing the rotation of the actuating element 80. The first opening segment 821 has a width corresponding to the width of the clamping shaft 21 of the reciprocating saw blade 20, thus improving the stability of the reciprocating saw in the saw blade clamping device 100.

[0025] How Fig. 8 and Fig. 9, the clamping shaft 11 of the jigsaw blade 10 is inserted into the receiving opening 820 when the jigsaw blade 10 is to be received. Since the actuating element 80 is in the receiving position, the clamping shaft 11 of the jigsaw blade 10 is inserted into the receiving groove 350 through an effective receiving opening formed by an intersection of the first opening segment 821 and the opening 350 of the receiving groove 35. During insertion, the fastening pin 50 moves away from the second clamping piece 34. After the clamping shaft 11 of the jigsaw blade 10 is inserted into a suitable position, the actuating element 80 is relaxed so that it rotates in the direction opposite to direction A by means of an elastic force of the elastic element 60.During rotation, the ends 420 of the U-profile 40 and the first end 52 of the fastening pin 50 protrude into the receiving groove 350 under the drive of the first drive surface 842 and the second drive surface 843 of the actuating element 80. The distance between the two ends 420 of the U-profile 40 is greater than the width of the clamping shaft 11 of the jigsaw blade 10. When the actuating element 80 is rotated back into the clamping position, both ends 420 of the U-profile 40 protrude into the receiving groove 35 and the inner sides of the ends 420 rest against both sides of the clamping shaft 11 of the jigsaw blade 10. The first end 52 of the fastening pin 50 is pressed against the clamping shaft 11 of the jigsaw blade 10, whereby the clamping shaft 11 of the jigsaw blade 10 is pressed against the inner wall of the first clamping piece 33. The clamping shaft 11 of the jigsaw blade 10 is then located in the second opening segment 822 of the receiving opening 820. As . Fig.As shown in Figure 8, the clamping shaft 11 of the jigsaw blade 10 has a pair of stops 12 on its sides. The width between them is greater than the width of the second opening segment 822. After assembly, both stops 12 engage with the second opening segment 822, and the end of the clamping shaft 11 of the jigsaw blade 10 rests against the bottom of the receiving groove 35, so that the jigsaw blade 10 is held stably in the saw blade clamping device 100. The radian dimension of the first opening segment 821 should be smaller than the pivoting play for the actuating element 80 to prevent the clamping shaft 11 of the jigsaw blade 10 from failing to engage with the second opening segment 822, thus preventing the jigsaw blade 10 from being held stably in the clamping device 100.

[0026] The elastic element 60 provides a preload for the actuating element 80 in the home position and a pressure against the saw blade for a respective component when the actuating element 80 is in the clamping position. From this, it can be seen that the same effect can be achieved by a screw engagement between the support block 30 and the actuating element 80. When the actuating element 80 is in the home position, the support block 30 and the actuating element 80 are stabilized in position by the engaging screws therebetween. When the actuating element 80 is in the clamping position, the engaging screws between the support block 30 and the actuating element 80 can be tightened to provide the respective component with pressure against the saw blade.With this structure, the receiving opening 820 of the actuating element 80 can be formed as a separate component to ensure that the screws between the actuating element 80 and the receiving bracket 30 can freely engage with each other. It only needs to be ensured that the receiving opening 820 is formed by the first opening segment 821 and the second opening segment 822 and fulfills the functionality in the above embodiments. Of course, it is possible to simultaneously retain the elastic element 60 when arranging the screws between the receiving bracket 30 and the actuating element 80 to improve the effect.

[0027] Although specific embodiments of the invention have been described in detail herein, they are intended only to illustrate the invention and should not be considered as limiting the scope of the invention. Rather, various substitutions, modifications, and variations may be conceived without departing from the spirit and scope of the invention.

Claims

[1] Saw blade clamping device (100) for a saw performing a linear reciprocating movement, characterized by that at least two types of saw blades (10, 20) can be clamped by the saw blade clamping device (100) and it comprises a receiving block (30) with a connecting part (31) driven by the saw performing the linear reciprocating movement and a receiving part (32) extending from the connecting part (31) and provided with a receiving groove (35); an actuating element (80) comprising an actuating part (81) and, at both ends of the actuating part (81), a mounting end (83) and a receiving end (82), respectively, wherein the actuating part (81) with the mounting end (83) can be pushed onto the receiving part (32) of the receiving block (30) and the receiving end (82) is provided with a receiving opening (820); and a pressure medium between the actuating element (80) and the receiving block (30), wherein the pressure medium has pressure ends which can be inserted into the receiving groove (35); wherein the actuating element (80) is rotatable relative to the receiving part (32) and is provided in an inner wall (84) with drive surfaces (842, 843) designed as curved surfaces, wherein the pressure means is provided with drive ends which can be pressed against the drive surfaces (842, 843), which, upon rotation of the actuating element (80), moves the pressure ends of the pressure means in the direction into the receiving groove (35) in order to press-fasten the inserted saw blade (10; 20); and that the pressure medium comprises a U-profile (40) and a fastening pin (50), wherein the U-profile (40) comprises a nose (410) arranged on a U-profiling (41) and two legs (42) extending from the U-profiling (41), and the fastening pin (50) comprises a first end (52) and a second end (53), wherein the nose (410) and the second end (53) serve as drive ends of the pressure medium and the ends of the legs (42) and the first end (52) serve as pressure ends of the pressure medium. [2] Saw blade clamping device (100) according to claim 1, characterized by that the receiving part (32) is cylindrical and comprises a first clamping piece (33) and a second clamping piece (34), and that the receiving groove (35) is introduced in the longitudinal direction of the receiving part (32) between the first clamping piece (33) and the second clamping piece (34). [3] Saw blade clamping device (100) according to claim 2, characterized bythat the first clamping piece (33) is provided with recesses (330) on both sides, and that a through hole (340) is made in the second clamping piece (34), wherein both the recesses (330) and the through hole (340) are connected to the receiving groove (35). [4] Saw blade clamping device (100) according to claim 3, characterized by that the legs (42) of the U-profile (40) are each received in a recess (330) of the first clamping piece (33) and the fastening pin (50) is received in the through-hole (340) of the second clamping piece (34). [5] Saw blade clamping device (100) according to claim 4, characterized by in that the drive surface in the inner wall (84) of the actuating element (80) comprises a first drive surface (842) and a second drive surface (843), wherein the first drive surface (842) and the second drive surface (843) each move the U-profile (40) and the fastening pin (50) in the direction into the receiving groove (35). [6] Saw blade clamping device (100) according to claim 4, characterized by that a cylindrical holder (70) is pushed onto the receiving part (32), which holder is provided with a cutout (710) and an opening (711), wherein the cutout (710) is assigned to the recesses (330) of the first clamping piece (33) and the opening (711) is assigned to the through-hole (340) of the second clamping piece (34), and wherein the U-profile (40) can be mounted on the first clamping piece (33) through the cutout (710) in the holder (70) and the fastening pin (50) can be received through the opening (711) into the through-hole (340) in the second clamping piece (34). [7] Saw blade clamping device (100) according to claim 1, characterized by that the receiving opening (820) is formed by an intersection of two slots (840) of different lengths, wherein the slot (840) of shorter length serves to hold one of the types of saw blades (10, 20) in the receiving groove (35). [8] Saw blade clamping device (100) according to claim 7, characterized by that the receiving groove (35) is provided with an opening (350), wherein the slots (840) of different lengths of the receiving opening (820) alternately overlap with the opening (350) of the receiving groove (35) with the rotation of the actuating element (80). [9] Saw blade clamping device (100) according to claim 8, characterized by that each of the slots (840) is formed from two opposing segments (821, 822). [10] Saw blade clamping device (100) according to one of claims 1-9, characterized by that an elasticity element (60) is arranged between the actuating element (80) and the receiving part (32), which elasticity element provides an elastic force between the actuating element (80) and the receiving part (32) in the circumferential direction. [11] Saw blade clamping device (100) according to one of claims 1-9, characterized bythat screws are provided between the actuating element (80) and the receiving part (32) which can be brought into engagement with one another. [12] Saw blade clamping device (100) according to one of claims 1-9, characterized by that the actuating element (80) and the receiving opening (820) are designed to be detachable from one another.

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