Swing path device of a machine tool, swing path unit of such a swing path device, and machine tool having such a swing path device

Abstract

An oscillating stroke device of a machine tool has a push-pull crank unit for converting a rotary movement into an at least substantially linear oscillation, comprising at least one crank unit (which can be driven by a drive unit of the machine tool and has at least one crank element with a crank axis), at least one fork element (which delimits a receiving region of the crank element) and at least one stroke rod (which is connected at an axial end to the fork element) for transmitting the linear oscillation to a tool receiving element of the machine tool in a push-pull direction which extends substantially parallel to the main extension direction of the stroke rod. The oscillating stroke device has at least one oscillating stroke unit which has at least one first guide element (which has a first guide surface which extends substantially perpendicular to the crank axis) which is fixed to the crank unit and at least one second guide element (which is at least fixedly connected to the fork element) which faces the first guide element and has a second guide surface which is at least partially inclined relative to the first guide surface.

Description

Technical Field

[0001] The present invention relates to a swing stroke device for a machine tool, particularly a saw, a swing stroke unit for the swing stroke device, and a machine tool having at least one swing stroke device. Background Technology

[0002] A oscillating stroke device for a machine tool has been proposed, having a push-pull crank unit for converting rotary motion into at least substantially linear oscillations. The push-pull crank unit includes at least one crank unit (which can be driven by the transmission unit of the machine tool and has at least one crank element with a crank axis), at least one fork element (which defines a receiving area for the crank element), and at least one stroke rod (which is connected to the fork element at its axial end) for transmitting linear oscillations to the tool receiving element of the machine tool in a push-pull direction that extends substantially parallel to the main extension direction of the stroke rod. Summary of the Invention

[0003] The present invention is based on an oscillating stroke device for a machine tool, particularly a saw, having a push-pull crank unit, particularly a Scottish yoke unit, for converting rotary motion into at least substantially linear oscillations. The push-pull crank unit includes at least one crank unit (which can be driven by the transmission unit of the machine tool and has at least one crank element with a crank axis), at least one fork element (which defines a receiving area for the crank element), and at least one stroke rod (which is connected to the fork element at its axial end) for transmitting linear oscillations to the tool receiving element of the machine tool in a push-pull direction that extends substantially parallel to the main extension direction of the stroke rod.

[0004] The proposed oscillating stroke device has at least one oscillating stroke unit, the oscillating stroke unit having at least one first guide element (having a first guide surface extending substantially perpendicular to the crank axis) fixedly constructed with the crank unit and at least one second guide element (having at least a fixed connection to the fork element) facing the first guide element, the second guide element having a second guide surface at least partially inclined relative to the first guide surface, the second guide surface being configured in at least one operating state to abut against the first guide surface and cause the fork element to oscillate stroke movement in a direction substantially parallel to the crank axis when the crank unit rotates.

[0005] According to the invention, the oscillating stroke device allows for particularly efficient cutting. The oscillating stroke motion can be superimposed on a linear oscillation using an advantageously simple mechanism. Furthermore, particularly high flexibility is available regarding different motion profiles of the oscillating stroke device. Additionally, a particularly simple and cost-effective structure is advantageously available. Furthermore, a robust structure is advantageously available for the oscillating stroke device. Particularly advantageously, particularly high durability of the oscillating stroke device can be achieved. Particularly high operating comfort and particularly efficient use of the machine tool are advantageously achieved.

[0006] The oscillating stroke device is preferably configured to convert the rotational motion of the machine tool's drive unit into a substantially linear oscillation of the machining tool (having a push-pull direction extending substantially perpendicular to the crank axis) and transmit it to the machining tool arranged on the tool receiving element of the machine tool. In at least one operating state, the oscillating stroke device is configured to superimpose the oscillating stroke motion, which extends substantially parallel to the crank axis, onto this linear oscillation. The machine tool's drive unit preferably comprises an electric motor, particularly preferably a brushless electric motor. The machine tool is particularly preferably battery-powered. Alternatively, the machine tool may be constructed as a corded machine tool. However, it is also conceivable that the machine tool's drive unit has an internal combustion engine. The tool receiving element of the machine tool for receiving the machining tool is preferably constructed as a clamping device, particularly preferably as a quick-locking element. The tool receiving element is preferably specifically configured to receive a saw blade with an S-shaped shank. It is also conceivable that the tool receiving element may, for example, have bolts for securing the machining tool. Furthermore, other configurations of the tool receiving element that are considered meaningful by those skilled in the art are also conceivable. The machining tool may be, in particular, a saw tool, such as a saw blade, a cutting tool, an abrasive, or the like. Machining tools preferably have machining surfaces arranged in a plane substantially parallel to the extension of a linear oscillating motion, such as the teeth of a saw blade, the cutting edge of a cutting edge, the grit of an abrasive, or the like. Machining tools preferably have straight machining surfaces. Alternatively, it is conceivable that the machining surfaces of a machining tool are curved, for example, constructed to have an arcuate or parabolic shape or similar form. "Set up" should be understood in particular as specifically established, specifically programmed, specifically designed, and / or specifically equipped. An object being set up for a specific function should be understood in particular as the object implementing and / or performing that specific function in at least one application and / or operational state.

[0007] The stroke lever is preferably configured to transmit linear oscillating and oscillating stroke motions to the tool receiving element of the machine tool. The linear oscillation motion is substantially parallel to the main extension direction of the stroke lever. The "main extension plane" of the element or structural unit should be understood in particular as a plane parallel to the largest side face of the smallest imaginary cuboid that just completely encloses the element or structural unit, and extending particularly through the center point of the cuboid. The stroke lever preferably has a basic cylindrical shape, particularly preferably constructed as a solid cylinder, and most preferably as a hollow cylinder. It is also conceivable that the stroke lever has a cross-section that deviates from a circle. The stroke lever is preferably made of metal, such as aluminum or steel. The stroke lever is preferably fixedly connected to the fork element at one axial end, particularly by force-locking and / or material-locking, and fixedly connected to the tool receiving element at the other axial end, particularly by force-locking and / or material-locking.

[0008] The push-pull crank unit used to convert rotary motion into substantially linear oscillation is preferably constructed as a Scottish yoke unit. The Scottish yoke unit is preferably configured as a rotary crank-slider, and particularly preferably as a oscillating crank-slider. The crank unit of the push-pull crank unit is preferably constructed as a cylindrical disk, and particularly preferably extends axially with a length of at least 2 mm, at least 5 mm, and particularly preferably at least 10 mm relative to the axis of rotation of the crank unit. In particular, the bottom surface of the crank unit can be constructed as circular. It is also possible that the bottom surface of the crank unit has a shape other than circular. The crank unit is preferably driven by a transmission unit of the machine tool to rotate about the axis of rotation. The transmission unit is preferably configured as an angular actuator. It is also conceivable that the transmission unit is constructed as a gear actuator. The axis of rotation preferably passes substantially perpendicularly, particularly perpendicularly to the bottom surface of the crank unit, through the geometric center point of the crank unit. The push-pull crank unit has a crank element with a crank axis. The crank axis preferably extends parallel to the longitudinal extension axis of the crank element, and preferably parallel to the axis of rotation of the crank unit. The crank element is preferably arranged on the bottom surface of the crank unit, particularly preferably in the edge region of the bottom surface of the crank unit. The crank element can be fixedly connected to the crank unit. Alternatively, the crank unit and the crank element can be manufactured integrally. Alternatively, the crank element can be rotatably arranged on the crank unit. The fork element is preferably configured to receive the crank element in a receiving region. The fork element preferably has a surface parallel to a plane, which is arranged substantially perpendicular to the axis of rotation of the crank unit. The receiving region for the crank element is constructed as a recess, preferably substantially rectangular, in the fork element. The main extending direction of the receiving region preferably extends in a plane parallel to the bottom surface of the crank unit and perpendicular to the push-pull direction.

[0009] The oscillating stroke unit is preferably configured such that, in the push-pull direction of the machining tool, the oscillating stroke motion, which extends substantially parallel to the crank axis, is superimposed on the substantially linear oscillation derived from rotation by the push-pull crank unit. The machining tool preferably moves forward and backward in the push-pull direction by the linear oscillation, while the oscillating stroke motion causes the machining tool to move upward and downward substantially perpendicular to the push-pull direction.

[0010] The first guide element having a first guide surface is preferably constructed integrally with the crank unit, especially as a single piece. "Integrally" should be understood in particular as at least material-lockingly connected, for example by welding, bonding, injection molding, and / or other processes deemed meaningful by those skilled in the art, and / or advantageously as formed in a single part, for example by casting and / or by single-component or multi-component injection molding, and advantageously made from a single blank. Advantageously, "integrally" should also be understood as "one-piece." "One-piece" should be understood in particular as formed in a single part. Preferably, this single part is made from a single blank, mass, and / or casting, particularly preferably by injection molding, especially single-component and / or multi-component injection molding. It is also conceivable that the first guide element is constructed as a separate component and is form-lockingly and / or force-lockingly connected to the crank unit. The first guide surface of the first guide element is preferably configured as a substantially flat surface. However, it is also conceivable that the first guide surface has a shape different from a flat surface. The second guide element, having a second guide surface, is preferably constructed integrally with the fork element, particularly as a single piece. It is also conceivable that the second guide element is constructed as a separate component and connected to the fork element in a form-locking and / or force-locking manner. The second guide surface is preferably constructed as a surface that is at least partially inclined relative to the first guide surface. "Inclined surface" should be understood as a surface that is inclined or non-uniformly oriented, particularly relative to a reference surface, with its inclination having a specific angle relative to a horizontal or vertical reference axis. Preferably, the second guide surface is at least partially constructed as an inclined surface with an angle of at least 2°, preferably at least 10°, and particularly preferably at least 25° relative to the first guide surface. However, it is also conceivable that the second guide surface is at least partially constructed as a curved surface, and for example, having a curved profile. It is also conceivable that substantially the entire second guide surface is constructed as an inclined surface relative to the first guide surface. The second guide surface is configured to deflect motion or force when abutting against the first guide surface to guide the fork element in a specific direction. When the second guide surface of the second guide element abuts against the first guide surface of the first guide element, it causes the fork element to swing in a direction that is substantially parallel to the crank axis. This swing motion is preferably transmitted to the machining tool arranged on the tool receiving element via a stroke rod.

[0011] Furthermore, it is proposed that the second guide surface has at least one partial surface (constructed as a plane extending parallel to the first guide surface) and at least one other partial surface (constructed as a curved surface). The boundary line between the partial surface and the other partial surface preferably extends parallel to the main extension direction of the stroke rod. Preferably, the maximum area of ​​the partial surface accounts for more than 10% of the second guide surface, particularly preferably more than 25%, and especially preferably more than 40%. The area of ​​the partial surface preferably accounts for at most 90%, preferably at most 75%, and especially preferably at most 60% of the second guide surface. Preferably, the other partial surface has a concave shape relative to the second guide surface. Alternatively, a convex shape of the other partial surface relative to the second guide surface is also conceivable. However, it is also conceivable that the other partial surface is configured as a plane extending obliquely relative to the partial surface. The flat partial surface preferably transitions seamlessly into the other, especially curved, partial surface. Preferably, the angle of the other partial surface gradually decreases to 0° relative to the first partial surface when transitioning to the first partial surface. Advantageously, it is possible to provide a variety of different motion profiles for the stroke motion with particular ease. Particularly advantageously, it is possible to achieve particularly high flexibility. In addition, it can advantageously improve the efficiency of the cutting and / or sawing process.

[0012] Furthermore, it is proposed that the oscillating stroke unit has a spring element configured to apply a spring force to the second guide element. The spring element is configured to apply a spring force to the second guide element. "Spring element" should be understood in particular as a macroscopic element having at least one extension that can elastically change by at least 10%, especially at least 20%, preferably at least 30%, and particularly advantageously at least 50% in normal operation, and that the element particularly generates a reaction force that depends on and is preferably proportional to the change in the extension, the reaction force opposing the change. The "extension" of the element should be understood in particular as the maximum distance between two points of the element's vertical projection on a plane. "Macroscopic element" should be understood in particular as an element with an extension of at least 1 mm, especially at least 5 mm, preferably at least 10 mm. The spring element is preferably constructed as a compression spring, supported on the housing portion of the machine tool. In particular, the spring force is a normal force relative to a planar portion of the second guide surface, acting on the second guide element in a direction toward the first guide surface. In particular, the spring force causes the first and second guide surfaces to abut against each other in at least one operating state. It is advantageous to be able to perform particularly precise stroke movements. It is particularly advantageous to keep the vibration generated during operation low and to advantageously improve operator comfort.

[0013] Furthermore, it is proposed that the crank unit has bearing elements, particularly axial bearing elements, for receiving axial forces. These bearing elements are connected to the transmission unit (especially in a material-locking manner) and have at least one support ring configured as a first guide element. The axial bearing is configured to effectively transmit axial loads in a direction parallel to the crank axis between the transmission unit and the crank unit. The axial bearing is preferably constructed as an axial ball bearing. However, the axial bearing can also be constructed as an axial roller bearing, an axial sliding bearing, an axial magnetic bearing, or the like. Advantageously, friction and wear are kept low by the axial bearing. In particular, advantageous high service life and reliability are achieved.

[0014] Furthermore, it is proposed that the swing stroke unit has a guide and / or support unit having at least one guide and / or support element (especially a sliding bearing) for guiding and / or supporting the stroke rod, and at least one pivot point suspension element for supporting the stroke rod in a rotatable manner about a rotation axis perpendicular to the main extension axis of the stroke rod. The guide and / or support unit is preferably configured to provide guidance and / or support for the stroke rod. The guide and / or support element is preferably constructed as a sleeve surrounding the stroke rod, especially as a sliding bearing. The guide and / or support unit preferably has a frame to which the at least one guide and / or support element and the pivot point suspension element are fixedly connected, particularly preferably constructed as a single piece with the guide and / or support unit. The pivot point suspension element is preferably arranged in the near region of the stroke rod away from the axial end of the fork element, particularly having a minimum distance preferably less than 100 mm, preferably less than 50 mm, and particularly preferably less than 20 mm. The pivot point suspension element is preferably used to rotatably support the guide and / or support element. Advantageously, the stroke rod can be supported in a defined position. Particularly advantageous is the low level of friction and wear. This configuration allows for the advantageous alteration of the direction of the linear oscillation of the stroke rod in a plane perpendicular to the axis of rotation of the suspension element at the point of rotation. Particularly advantageous is the ability to guide the stroke rod safely and with low friction during the oscillating stroke. This also results in advantageously high durability.

[0015] Furthermore, it is proposed that the oscillating stroke unit has at least one adjusting element configured to adjust the push-pull direction of the stroke lever. Preferably, the adjusting element allows adjustment of the push-pull direction of the stroke lever in a direction substantially parallel to the crank axis. Preferably, the adjusting element is arranged in the proximal region of the fork element. The adjusting element can be configured, for example, as a thread in the guide and / or support unit, by means of which the position of the guide and / or support unit can be changed, thereby changing the position of the stroke lever. Particularly preferably, the push-pull direction of the stroke lever can be adjusted such that the first guide surface and the second guide surface do not abut against each other in at least one operating state, especially during rotation of the crank unit. Preferably, the adjusting element has a manual knob. However, it is also conceivable that the adjusting element has a lever or other mechanisms that are deemed meaningful by those skilled in the art. The adjusting element is preferably arranged on the housing of the machine tool. With this configuration, the stroke movement can be advantageously and easily engaged and disengaged.

[0016] Furthermore, it is proposed that the oscillating stroke unit has an adjusting slide element having at least two adjusting states, which respectively define the relative positions of a first guide element and a second guide element relative to each other. The adjusting slide element is particularly used for mechanical guidance, especially for the mechanical guidance of the adjusting element, and preferably, each of the at least two adjusting states has a section in which the adjusting element can move. Each of the sections preferably has a stop region for the adjusting element, wherein each stop region preferably has a stop surface arranged substantially parallel to the bottom surface of the crank unit. Preferably, the distance between the stop surface for the first adjusting state and the first guide surface is less than the distance between the stop surface for the second adjusting state and the first guide surface. Preferably, the stop surfaces for the first adjusting state and the stop surfaces for the second adjusting state are arranged at least 2 mm, preferably at least 5 mm, and particularly preferably at least 10 mm apart from each other in a direction perpendicular to the stop surfaces. Preferably, in the first adjusting state of the adjusting element, the first guide surface and the second guide surface are abutting each other. Preferably, in the second adjusting state of the adjusting element, the first guide surface and the second guide surface are spaced apart from each other during a complete rotation of the crank unit. The adjusting element preferably allows for the on / off switching of the oscillating stroke. It is also conceivable that the adjusting slide element has more than two adjusting states, thereby advantageously altering the magnitude of the oscillating stroke. Preferably, the adjusting slide element is constructed as a single piece with the guide and / or support unit. However, it is also possible that the adjusting slide element is arranged as a separate component on the guide and / or support unit. Furthermore, it is also possible that the adjusting slide element is arranged on the machine tool housing or on other components of the machine tool that are deemed meaningful by those skilled in the art. The adjusting slide element is preferably made of metal, such as aluminum or steel. However, configurations of the adjusting slide element made of plastic (e.g., thermosetting plastic) or combinations of materials deemed meaningful by those skilled in the art are also conceivable. This provides advantageously simple and particularly precise operation of the adjusting element.

[0017] Furthermore, it is proposed that the adjusting element has a mating element, particularly a bolt, configured to engage with an adjusting slide element, wherein in at least one adjusting state of the adjusting element, a first guide element and a second guide element are abutting each other, and in at least one other adjusting state, the first guide element and the second guide element are spaced apart by a lifting height H. The mating element is preferably made of bolt. The mating element is preferably made of metal. Alternatively, a mating element made of plastic is also conceivable. Preferably, the mating element is integrally constructed with the adjusting element. However, it is also possible that the mating element is form-locked and / or force-locked connected to the adjusting element. For example, the mating element may be threaded and screwed into the adjusting element. Alternatively, a mating element constructed as a bolt may be pressed into and / or glued into an opening in the adjusting element. Preferably, the adjusting element has an operating element, such as a manual knob, by which an operator can operate the adjusting element. The operator can preferably rotate the operating element to transition the mating element of the adjusting element from one adjusting state to another. Preferably, the operating element can rotate in steps of at least 180°, preferably at least 90°, and particularly preferably at least 60° to transition the adjusting element from one adjusting state to another. The lifting height H is preferably defined by the distance between the stop surface of the first adjusting state and the stop surface of the second adjusting state of the adjusting slide element in a direction perpendicular to the stop surface. In one adjusting state, particularly when the first and second guide surfaces are in contact with each other, the lifting height H is preferably substantially 0 mm. Preferably, in at least one other adjusting state, the lifting height H is at least 2 mm, preferably at least 5 mm, and particularly preferably at least 10 mm. With this configuration, particularly reliable adjustment of the oscillating stroke movement can be advantageously achieved.

[0018] Furthermore, the present invention is based on a swing stroke unit for a swing stroke device, particularly for a swing stroke device according to the present invention. This allows for advantageously efficient sawing and / or cutting. Moreover, existing swing stroke devices can be advantageously and cost-effectively retrofitted with the swing stroke unit according to the present invention. High sustainability can be advantageously achieved.

[0019] Furthermore, the present invention is based on a machine tool having a swing stroke device, particularly a swing stroke device according to the present invention, especially a saw. Preferably, the machine tool is configured as a handheld machine tool. Preferably, the machine tool is configured as a handheld saw. It is also conceivable that the machine tool may have other configurations that are meaningful to those skilled in the art, such as being configured as a gardening machine tool, a multi-purpose machine tool, or the like.

[0020] The oscillating stroke device, oscillating stroke unit, and / or machine tool according to the invention should not be limited to the applications and embodiments described above. In particular, to achieve the functional configuration described herein, the oscillating stroke device, oscillating stroke unit, and / or machine tool according to the invention may have a different number than the various elements, components, and units mentioned herein. Furthermore, for the numerical ranges given in this disclosure, values ​​within the limits should also be considered disclosed and can be used arbitrarily. Attached Figure Description

[0021] Other advantages will become apparent from the following description of the accompanying drawings. One embodiment of the invention is illustrated in the drawings. The drawings, description, and claims contain a variety of features in combination. Those skilled in the art can also practically consider these features individually and generalize them into other meaningful combinations.

[0022] It shows: Figure 1 According to the present invention, Figure 2 A portion of the machine tool according to the invention (having the oscillating stroke device according to the invention) in a schematic partial sectional view. Figure 3 The fork element of the swing stroke device according to the invention (with a second guide element and a second guide surface) shown in the schematic diagram. Figure 4 A portion of the oscillating stroke device according to the invention (having the oscillating stroke unit according to the invention) in a schematic partial cross-sectional view. Figure 5 The schematic diagram shows a swing stroke device according to the invention, comprising a push-pull crank unit, a swing stroke unit, and a guide and / or support unit. Figure 6: A view of the push-pull crank unit of the oscillating stroke device according to the invention in a direction parallel to the push-pull direction ( Figure 6a and 6b In the top view along direction "A" and in the top view ( Figure 6c and 6d A schematic diagram of the combined action of the first and second guide surfaces of the oscillating stroke device according to the present invention. Detailed Implementation

[0023] Figure 1A machine tool 12, particularly a saw, is shown with a oscillating stroke device 10. The machine tool 12 is configured as a handheld machine tool. The machine tool 12 is configured as an electric saw, particularly a battery-powered saw. The machine tool 12 is configured as a battery-powered saber saw, particularly a battery-powered saber saw. However, it is also conceivable that the machine tool 12 is configured as a wire saw. Alternatively, it is also conceivable that the machine tool 12 is configured as a fuel-powered saw, a compressed air-powered saw, or the like. The oscillating stroke device 10 is fixedly arranged within the housing of the machine tool 12. Figure 1 A machining tool 31, particularly a saw blade, is also shown that is detachably connected to the machine tool 12. The machine tool 12 has a tool receiving element 30 configured to receive the machining tool 31 by means of a quick-locking element, particularly for receiving saw blades with S-shaped shanks. Alternatively, the tool receiving element 30 may have bolts for securing the machining tool 31. The machining tool 31 is configured for sawing wood, metal, plastic, or the like during operation. However, it is also conceivable, particularly depending on the configuration of the machine tool 12, that the machining tool 31 may be constructed as a cutting tool or a grinding tool.

[0024] Figure 2 A portion of machine tool 12 is shown. Machine tool 12 has a drive unit 72. The drive unit 72 is formed by an electric motor. The drive unit 72 is fixedly arranged in the housing of machine tool 12. Preferably, the axis of rotation of the drive unit 72 is oriented substantially parallel to the longitudinal axis of machine tool 12. In addition, machine tool 12 has a transmission unit 18. The transmission unit 18 is exemplarily formed by an angle gear. The transmission unit 18 has a first transmission element that is torsionally connected to the driven shaft of the drive unit 72. The first transmission element is formed, in particular, by a bevel gear. In addition, the transmission unit 18 has a second transmission element. The second transmission element is also formed by a bevel gear. The transmission unit 18 is configured to steer and decelerate the drive motion of the drive unit 72.

[0025] Figure 2The oscillating stroke device 10 of the machine tool 12 is shown in its mounting position. The oscillating stroke device 10 is received within the housing of the machine tool 12. The machining tool 31 is received in a tool receiving element 30. The oscillating stroke device 10 has a push-pull crank unit 14 (constructed as a Scottish yoke unit) for converting rotary motion into at least substantially linear oscillation. The push-pull crank unit 14 has a crank unit 16, which can be driven by a transmission unit 18 of the machine tool 12, driven by a drive unit 72. The crank unit 16 is torsionally connected to a second transmission element of the transmission unit 18. The crank unit 16 is constructed as a disc with a cylindrical base and has an axial length extension of at least 3 mm, preferably at least about 5 mm. Currently, the crank unit 16 is made of metal. The crank unit 16 is driven by the transmission unit 18 of the machine tool 12 to rotate about a rotation axis 68. The push-pull crank unit 14 also includes a crank element 20 having a crank axis 22, which is arranged parallel to and offset from the rotation axis 68 of the crank unit 16. The crank element 20 is rotatably arranged on the bottom surface of the crank unit 16, in the edge region of the bottom surface of the crank unit 16, about the crank axis 22. The crank element 20 is arranged on the side of the crank unit 16 opposite to the second transmission element. The crank element 20 is formed of a cylindrical element rotatably supported on the crank unit 16. The push-pull crank unit 14 converts rotational motion into at least substantially linear oscillations having a push-pull direction 32 that extends substantially perpendicular to the crank axis 22. The push-pull crank unit 14 has a fork element 24, which defines a receiving area 26 for receiving the crank element 20. The fork element 24 is constructed as a member having a substantially elliptical basic shape and having a parallel planar surface arranged perpendicular to the rotation axis 68 of the crank unit 16. The fork element 24 is made of steel. Alternatively, it is conceivable that the fork element 24 is made of other metals or other materials. The receiving area 26 is substantially rectangular in construction and has a main extension direction that extends in a plane parallel to the bottom surface of the crank unit 16 and perpendicular to the push-pull direction 32. The oscillating stroke device 10 also has a stroke rod 28, which is connected to the fork element 24 at its axial end for transmitting linear oscillations to the tool receiving element 30 of the machine tool 12 in the push-pull direction 32, which extends substantially parallel to the main extension direction of the stroke rod 28. At the other axial end, the stroke rod 28 is fixedly connected to the tool receiving element 30. Currently, the stroke rod 28 is made as a hollow cylindrical rod made of metal, particularly aluminum.

[0026] The oscillating stroke device 10 has an oscillating stroke unit 34. The oscillating stroke unit 34 has a first guide element 36 (configured to be fixedly connected to the crank unit 16 and having a first guide surface 38 extending substantially perpendicular to the crank axis 22) and a second guide element 40 (fixedly connected to the fork element 24) facing the first guide element 36. The second guide element has a second guide surface 42 at least partially inclined relative to the first guide surface 38. The second guide surface is configured in at least one operating state to abut against the first guide surface 38 and cause the fork element 24 to oscillate in a direction substantially parallel to the crank axis 22 when the crank unit 16 rotates. Currently, the first guide surface 38 of the first guide element 36 is configured as a flat surface. The second guide element 40 having the second guide surface 42 is preferably constructed as a single piece with the fork element 24 (see also...). Figure 3 The second guide surface 42 has a partial surface 44 (which is constructed as a flat surface extending parallel to the first guide surface 38) and another partial surface 46 (which is constructed as a curved surface). Currently, the other partial surface 46 has an inclination angle of 25° relative to the first guide surface 38. However, a curved profile of the other partial surface 46 is also conceivable. The area of ​​the partial surface 44 and the area of ​​the other partial surface 46 each account for 50% of the area of ​​the second guide surface 42. The inclination angle of the other partial surface 46 gradually decreases to 0° when transitioning to the partial surface 44, so that no edge is generated between the partial surface 44 and the other partial surface 46.

[0027] The swing stroke unit 34 has a spring element 48 configured to apply a spring force to the second guide element 40. Currently, the spring element 48 is constructed as a compression spring, particularly a helical spring. The spring element 48 is supported relative to the housing portion of the machine tool 12 and applies a normal force to the second guide element 40, such that the first guide surface 38 and the second guide surface 42 are in contact with each other in at least one operating state. However, it is also conceivable that the spring element 48 is configured as a tension spring to apply a normal force to the second guide element 40, such that the first guide surface 38 and the second guide surface 42 are in contact with each other in at least one operating state.

[0028] The swing stroke unit 34 includes a guide and / or support unit 54 having a guide and / or support element 56.

[0029] A guide and / or support unit 54 is configured to guide and / or support the stroke rod 28. Currently, the guide and / or support unit 54 has two guide and / or support elements 56 configured as sliding bearings, in which the stroke rod 28 is arranged to move with low friction along the push-pull direction 32. The guide and / or support elements 56 are fixedly connected to each other and spaced apart along the axial extension of the stroke rod 28. However, it is also conceivable that the guide and / or support unit 54 includes guide and / or support elements 56, particularly sliding bearings, extending beyond at least 25% of the total longitudinal extension of the stroke rod 28. The guide and / or support unit 54 also has a pivot point suspension element 58 for supporting the stroke rod 28 in a rotatable manner about a rotation axis 60 extending perpendicular to the main extension axis of the stroke rod 28. The pivot point suspension element 58 is arranged in the proximal region of the stroke rod 28 toward the axial end toward the tool receiving element 30. The rotation point suspension element 58 is constructed as a bushing and can be rotatably arranged on a corresponding shaft about a rotation axis 60, which is arranged on the housing of the machine tool 12.

[0030] The oscillating stroke unit 34 has an adjusting element 62 configured to adjust the push-pull direction of the stroke lever 28. The adjusting element 62 is arranged in the proximal region of the fork element 24. The adjusting element 62 can be configured as a thread in the guide and / or support unit 54, by means of which the position of the guide and / or support unit 54 can be changed, thereby changing the position of the stroke lever 28. The adjusting element 62 adjusts the push-pull direction 32 of the stroke lever 28 by adjusting the guide and / or support unit 54 in which the stroke lever 28 is guided and / or supported. When the adjusting element 62 is operated, the position of the guide and / or support unit 54 is achieved by rotation about the rotation axis 60 of the suspension element 58 at the rotation point. This adjusts the position of the stroke lever 28 such that the first guide surface 38 and the second guide surface 42 do not come into contact with each other in at least one operating state, especially during the rotation of the crank unit 16. Currently, the adjusting element 62 has a manual knob arranged on the housing of the machine tool 12. However, configurations of the adjusting element 62 with an adjusting lever or the like are also conceivable.

[0031] The swing stroke unit 34 has an adjusting slide element 64 with two adjusting states, which respectively define the relative positions of the first guide element 36 and the second guide element 40 to each other (see...). Figure 4The adjusting slide element 64 is configured to mechanically guide the adjusting element 62 and defines the relative positions of the first guide element 38 and the second guide element 42 to each other using two adjusting states. Currently, the adjusting slide element 64 is constructed as a single piece with the guide and / or support unit 54. The swing stroke movement is engaged or disengaged by switching between the two adjusting states. The adjusting slide element 64 has a region in each of the at least two adjusting states in which the adjusting element 62 can move. Each of the regions has a stop region for the adjusting element 62, wherein each stop region preferably has a stop surface arranged substantially parallel to the bottom surface of the crank unit 16. The distance between the stop surface for the first adjusting state and the first guide surface 38 is less than the distance between the stop surface for the second adjusting state and the first guide surface. Currently, the stop surfaces for the first adjusting state and the stop surfaces for the second adjusting state are arranged at least 5 mm apart from each other in a direction perpendicular to the stop surfaces. In the first adjusting state of the adjusting element 62 in the adjusting slide element 64, the first guide surface 38 and the second guide surface 42 are in contact with each other. In the second adjusting state of the adjusting element 62 within the adjusting slide element 64, the first guide surface 38 and the second guide surface 42 are spaced apart from each other during the complete rotation of the crank unit 16, and in particular, do not contact each other. It is also conceivable that the adjusting slide element 64 has more than two adjusting states, thereby allowing for changes in the magnitude of the oscillation stroke. The adjusting element 62 has a mating element 66, particularly a bolt, configured to engage with the adjusting slide element 64, wherein in at least one adjusting state of the adjusting element 62, the first guide surface 36 and the second guide surface 40 are abutting each other, while in at least one other adjusting state, the first guide surface 36 and the second guide surface 40 are spaced apart by a lifting height H. The mating element 66 is constructed as a bolt made of metal. Alternatively, a mating element made of plastic is also conceivable. Currently, the engaging element 66 is integrally constructed with the adjusting element 62. The adjusting element 62 has an operating element 70 configured as a manual knob, by which an operator can operate the adjusting element 62, and the engaging element 66 can transition from one adjusting state of the adjusting slide element 64 to another adjusting state. Currently, the adjusting element 62 rotates 90° with the operating element 70 to transition from one adjusting state to another.

[0032] Crank unit 16 has a bearing element 50 for receiving axial force, which is connected to a second transmission element of transmission unit 18, the second transmission element having a support ring 52 configured as a first guide element 36 (see also...). Figure 5 Currently, bearing element 50 is configured as an axial ball bearing. Alternatively, it is also conceivable that bearing element 50 be configured as an axial sliding bearing.

[0033] Figure 6 schematically illustrates the combined action of the first guide surface 38 of the first guide element 36 and the second guide surface 42 of the second guide element 40. Figure 6a and 6b The view shown is of the push-pull crank unit 14 viewed along a direction extending toward the machining tool 31 and parallel to the axis of rotation 68. Figure 6a and 6b Also shown is an adjusting element 62 for adjusting the push-pull direction 32 of the stroke lever 28 and a spring element 48 configured to apply a spring force to the second guide element 40. Figure 6c and 6d It shows in Figure 6a and 6b A view of the push-pull crank unit in direction A as shown. Figure 6a As shown, the crank element 20 is arranged in the receiving region 26 of the fork element 24, and the crank unit 16 is in a position relative to rotation about the axis of rotation 68, in which, as Figure 6c As shown, a portion 44 of the second guide surface 42 abuts against the first guide surface 38. To receive axial loads, the crank unit 16 has a bearing element 50 that is materially engaged with the transmission unit 18, having a support ring 52 configured as the first guide element 36. The first guide element 36 has a flat first guide surface 38 extending perpendicular to the crank axis 22. The second guide surface 42 has a portion 44 and another portion 46, wherein the other portion 46 is configured as a curved surface with a concave profile. When the crank unit 16... Figure 6a and 6c Rotate clockwise to the position shown. Figure 6b and 6d In the position shown, the crank element 20 moves from one side of the receiving area 26 of the fork element 24 to the other side of the receiving area 26. As the crank element 20 rotates clockwise, the fork element 24 moves in a direction away from the main extension direction of the tool 31 and parallel to the stroke rod 28. Furthermore, by abutting the first guide surface 38 against the second guide surface 42, the fork element 24 moves in a direction away from the first guide element 36 and parallel to the crank axis 22. Therefore, the tool 31 is arranged on the tool receiving element 30 (which is arranged on the stroke rod 28), and the crank unit 16 moves from... Figure 6a and 6c Rotate clockwise to the position shown. Figure 6b and 6dAt the indicated position, movement is performed in the direction of crank unit 16, which is superimposed on the oscillating stroke movement in the direction towards the workpiece. By operating the adjustment element 62, the push-pull direction 32 of the stroke lever 28 is adjusted such that the second guide surface 42 is spaced apart from the first guide surface 38 by a lifting height H. In this adjusted state of the adjustment element 62, the oscillating stroke movement of the oscillating stroke unit 34 is shut off.

Claims

1. A oscillating stroke device (10) for a machine tool (12), particularly a saw, having a push-pull crank unit (14), particularly a Scottish yoke unit, for converting rotary motion into at least substantially linear oscillations, the push-pull crank unit comprising: At least one crank unit (16), which is driveable by the transmission unit (18) of the machine tool (12), and the crank unit has at least one crank element (20) with a crank shaft (22); and At least one fork element (24) is provided, the fork element being defined for the receiving area (26) of the crank element (20). and At least one stroke rod (28), which is connected at its axial end to the fork element (24), is used to transmit the linear oscillation to the tool receiving element (30) of the machine tool (12) in a push-pull direction (32) extending substantially parallel to the main extension direction of the stroke rod (28). Its features are, At least one swing stroke unit (34) is provided, the swing stroke unit having: At least one first guide element (36) fixedly constructed with the crank unit (16), the first guide element having a first guide surface (38) extending substantially perpendicular to the crank axis (22); and At least one second guide element (40) toward the first guide element (36), the second guide element being fixedly connected to at least the fork element (24), the second guide element having a second guide surface (42) at least partially inclined relative to the first guide surface (38), the second guide surface being configured in at least one operating state to abut against the first guide surface (38) and cause the fork element (24) to swing stroke in a direction substantially parallel to the extension of the crank axis (22) when the crank unit (16) rotates.

2. The swing stroke device (10) according to claim 1, characterized in that, The second guide surface (42) has at least one partial surface (44) and at least one additional partial surface (46), the partial surface being constructed as a flat surface parallel to the first guide surface (38), and the additional partial surface being constructed as a curved surface.

3. The swing stroke device (10) according to claim 1 or 2, characterized in that, The swing stroke unit (34) has a spring element (48) configured to apply a spring force to the second guide element (40).

4. The swing stroke device (10) according to any one of the preceding claims, characterized in that, The crank unit (16) has a bearing element (50), particularly an axial bearing element, for receiving axial force. The bearing element is connected to the transmission unit (18) in a material-locking manner and has at least one support ring (52), which is configured as the first guide element (36).

5. The swing stroke device (10) according to any one of the preceding claims, characterized in that, The swing stroke unit (34) has a guide and / or support unit (54), the guide and / or support unit having: At least one guide and / or support element (56), particularly a sliding bearing, is used to guide and / or support the stroke rod (28); and At least one swivel suspension element (58) is provided for supporting the stroke rod (28) in a manner that allows it to rotate about a rotation axis (60) perpendicular to the main extension axis of the stroke rod (28).

6. The swing stroke device (10) according to any one of the preceding claims, characterized in that, The swing stroke unit (34) has at least one adjusting element (62) configured to adjust the push-pull direction of the stroke rod (28).

7. The swing stroke device (10) according to any one of the preceding claims, characterized in that, The swing stroke unit (34) has an adjusting slide element (64) having at least two adjusting states, which respectively define the relative positions of the first guide element (36) and the second guide element (40) to each other.

8. The swing stroke device (10) according to claims 6 and 7, characterized in that, The adjusting element (62) has a mating element (66), in particular a bolt, which is configured to engage with the adjusting slide element (64), wherein in at least one adjusting state of the adjusting element (62), the first guide element (36) and the second guide element (40) are abutting each other, and in at least one other adjusting state, the first guide element (36) and the second guide element (40) are spaced apart from each other by a lifting height H.

9. A swing stroke unit (34) for use in the swing stroke device (10) according to any one of the preceding claims.

10. A machine tool (12), particularly a saw, having at least one oscillating stroke device (10) according to any one of claims 1 to 8.

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