RING OWNERSHIP

Description

AREA OF INVENTION

[0001] The present invention relates to a ring saw according to the preamble of claim 1.

[0002] Ring saws drive a ring saw blade eccentrically via a drive wheel. This eccentric drive requires guidance for the ring saw blade, which is achieved through rollers and wheels. This can result in significant friction losses between the rollers and the ring saw blade. Furthermore, changing the ring saw blade is a complex process, particularly as the drive wheel and rollers must be readjusted for proper guidance.

[0003] A ring saw according to the preamble of claim 1 can be found in DE 900 493 C.

[0004] DE 900 493 C discloses a motor-driven circular saw with a ring-shaped saw blade, which can be used primarily for woodworking. The saw is characterized by an I-shaped profile of the saw ring cross-section with a reinforced head and base, by the paired, angled arrangement of the guide rollers, and by a gear drive for a motor, preferably mounted on the housing.

[0005] DE 2 161 489 A1 discloses a motor-driven, portable work device with a ring-shaped tool, wherein the tool is rotatable by a drive roller and held on a bracket. The work device has means acting on the tool that counteract and attempt to compensate for any swiveling. REVELATION OF THE INVENTION

[0006] According to the invention, a ring saw comprises a tool holder for guiding a ring saw blade in a cutting plane, a motor, a drive wheel, at least one guide roller, and at least one guide cylinder. The drive wheel is arranged in the cutting plane to drive the ring saw blade and is coupled to the motor. The at least one guide roller is arranged on one side of the cutting plane to guide the ring saw blade from that side. The at least one guide cylinder is arranged on the opposite side of the cutting plane to guide the ring saw blade from that opposite side. The guide roller is mounted to rotate freely about an axis of rotation. The axis of rotation is inclined at 50 to 80 degrees relative to the cutting plane. The guide roller has two concentric rolling elements. The inclination of the guide roller is approximately parallel to an axis of rotation of the ring saw blade and can nevertheless engage in a guide groove of the ring saw blade.Furthermore, the guide roller can have a larger diameter than the width of the guide groove. The orientation of the guide roller and its possible diameter contribute significantly to low friction loss.

[0007] According to one embodiment, the guide roller can have at least one rolling element with a rotationally symmetrical outer surface. According to the invention, the guide roller has two concentric rolling elements. In a preferred embodiment, the guide roller has more than two concentric rolling elements. A first rolling element can have a smaller radius than a second rolling element. The first rolling element is arranged closer to the cutting plane along the axis of rotation than the second rolling element. The segment of the first rolling element closest to the cutting plane E and the segment of the second rolling element closest to the cutting plane E preferably lie in the same plane. The two closest segments preferably engage in the guide grooves of the ring saw blade.

[0008] In one embodiment, the first rolling element is mounted on the second rolling element. The required bearing is only subjected to the relative rotational speed of the smaller rolling element relative to the larger rolling element, and not to the much higher absolute rotational speed relative to the machine housing.

[0009] The smaller rolling element rotates at a high absolute speed relative to the machine housing, resulting in a high load on the bearings. Bearing it on the larger, rotating rolling element reduces the relative speed acting on the bearings of the smaller rolling element.

[0010] One embodiment provides that an axis of rotation of the guide roller and the axis of rotation of the guide roller lie in a plane perpendicular to the cutting plane.

[0011] In a preferred embodiment, the axis of rotation of the guide roller is inclined relative to the cutting plane. The guide roller can be conical. The circumferential speed of the rolling surface of the guide roller increases from the end facing the axis of rotation to the end facing away from the axis of rotation. This increase preferably corresponds approximately to the higher rotational speed of more distant areas of the ring saw blade compared to areas closer to the axis of rotation. Friction between the guide roller and the ring saw blade can thus be reduced.

[0012] The ring saw blade has a flat, ring-shaped carrier with a side surface and an outer circumference. One or more cutting elements are arranged along the outer circumference of the carrier. At least one ring-shaped groove is countersunk into the side surface. The groove has a radially inner flank and a radially outer flank. The radially inner flank is conical, and the cone describing the conical flank has a half-opening angle of between 10 and 30 degrees. The ring saw blade enables low-friction guidance via the inclined flanks. A guide roller can rotate approximately parallel to an axis of rotation of the ring saw blade and bear against the groove. Furthermore, the guide roller can have a larger diameter than the width of the groove. The orientation of the guide roller and its possible diameter contribute significantly to low frictional loss.

[0013] Preferably, the radially outer flank runs continuously beneath, i.e., on a side facing the support, a descriptive conical shell which is perpendicular to the inner flank and which passes through a point on the inner flank furthest from the side surface, i.e., its lowest point. A cylindrical guide roller may bear against the inclined inner flank.

[0014] The profile of the ring saw blade can be asymmetrical. Preferably, the outer flank is conical. The cone describing the conical flank has a half-opening angle between 50 and 80 degrees. The asymmetrical shape offers minimal weakening of the support due to the minimal cross-section of the groove.

[0015] According to one aspect not according to the invention, a ring saw has a tool holder for guiding a ring saw blade in a cutting plane E, a motor, a drive wheel, at least one guide roller, and at least one guide cylinder. The drive wheel is arranged in the cutting plane for driving the ring saw blade and is coupled to the motor. The at least one guide roller is arranged on one side of the cutting plane, and the at least one guide cylinder is arranged on the opposite side of the cutting plane. The ring saw has a bearing block in which the drive wheel is rotatably mounted about a drive axis perpendicular to the cutting plane. The bearing block is displaceable parallel to the cutting plane. The design with the displaceable drive wheel allows for tool-free removal and insertion of the ring saw blade.

[0016] A preferred embodiment features a bevel gear unit that couples the drive wheel to the motor. The bevel gear unit has a crown gear connected to the drive wheel. The crown gear is mounted in the bearing block. The drive wheel and the crown gear form a single, slidable unit. The bevel gear unit with the crown gear is very insensitive to inaccurate positioning of the crown gear. This results in good tolerance when inserting ring saw blades of slightly different widths.

[0017] According to one aspect not according to the invention, a ring saw has a tool holder for guiding a ring saw blade in a cutting plane, a motor, and a drive wheel arranged in the cutting plane to drive the ring saw blade and coupled to the motor. The drive wheel is rotatably mounted in a bearing block about a drive axis perpendicular to the cutting plane E. A guide roller is arranged on one side of the cutting plane to guide the ring saw blade from that side. A guide roller is arranged on the opposite side of the cutting plane to guide the ring saw blade from that opposite side. The guide roller is arranged in a hood that pivots relative to the cutting plane. Opening the hood provides the user with access to the tool holder. At the same time, the guide rollers are lifted away from the ring saw blade, and the locking mechanism of the ring saw blade is released.The user can replace the ring saw blade without tools.

[0018] In one embodiment, the tool holder can have a receiving space for the ring saw blade, with the hood covering the receiving space. The drive wheel, the guide roller, and the guide drum can be arranged in the receiving space.

[0019] In one embodiment, it is provided that a section of the outer surface of the guide roller facing the cutting plane runs parallel to the cutting plane.

[0020] In a preferred embodiment, the hood can be locked to a machine housing. The hood can be opened and closed via an operating lever.

[0021] In another preferred embodiment, the drive wheel is displaceable in the cutting plane, and the movement of the hood and the drive wheel are synchronized by a mechanism. An actuating lever can have an open and a closed position. The hood and the drive wheel are coupled to the actuating lever such that, in the closed position, the hood is closed and the drive wheel is pressed against the ring saw blade, and in the open position, the hood is open and the drive wheel is moved away from the ring saw blade. The user does not need any complex adjustment or alignment to change a ring saw blade.

[0022] One embodiment provides that the actuating lever, starting from the closing position to the opening position, first moves the drive wheel and then opens the hood.

[0023] According to one aspect not according to the invention, a ring saw has a tool holder for guiding a ring saw blade. The tool holder is arranged in a receiving chamber. A drive wheel serves to drive the ring saw blade and is arranged in the cutting plane and coupled to the motor. A guide roller is arranged on one side of the cutting plane for guiding the ring saw blade from one side. It has an outlet which is directed towards the guide roller. The guide roller is cleaned by water, which then cools the ring saw blade.

[0024] A preferred embodiment provides that the guide roller is arranged upstream of the receiving chamber in the direction of water flow. The guide roller can have a cylindrical rolling element for engaging in guide grooves of the ring saw blade. The outlet is directed towards a cylindrical surface of the rolling element or towards a surface facing away from the cutting plane. The water first comes into contact with the cylindrical surface before reaching the dusty or muddy ring saw blade.

[0025] One embodiment provides that the rolling elements are arranged in a pot which is sealed against a machine housing and has an opening facing the receiving space. One segment of the rolling elements can be arranged within the receiving space and another segment can be arranged inside the pot. The opening is preferably smaller than the cross-section of the rolling element.

[0026] In one embodiment, the outlet is located inside the pot. A channel connected to the outlet can have a helical section running around the axis of rotation of the guide roller. The water can be directed onto the guide roller in the direction of its rotation. BRIEF DESCRIPTION OF THE FIGURES

[0027] The following description explains the invention with reference to exemplary embodiments and figures. The figures show: Fig. 1 Ring saw and ring saw blade Fig. 2 Section in plane II-II Fig. 3 Groove profile of a ring saw blade, section III-III Fig. 4 Alternative groove profiles of the ring saw blade Fig. 5 Section in plane VV through guide roller and guide cylinder Fig. 6 Section in plane VV with the hood open Fig. 7 Drive Fig. 8 Mechanism for removing and locking a ring saw blade in the closed position Fig. 9 Mechanism for removing and locking a ring saw blade in an intermediate position Fig. 10 Mechanism for removing and locking a ring saw blade in the open position Fig. 11 Water guide, section in plane VV

[0028] Identical or function-equivalent elements are indicated by the same reference symbols in the figures, unless otherwise specified. FORMS OF EXECUTION OF THE INVENTION

[0029] A schematic representation of a ring saw blade 1 and a ring saw 2 are in a top view in Fig. 1 and shown in a vertical section in plane II-II. The ring saw blade 1 It has the shape of a flat, ring-shaped disc with radially outward-facing cutting elements. 3. The shape provides an axis of rotation. 4 before, around which the ring saw blade 1 is rotated as required. The ring saw 2 has a tool holder 5, in which the ring saw blade 1 around that axis of rotation 4 It is mounted on a rotatable bearing. The drive is eccentric to the axis of rotation. 4 by means of a drive wheel 6, which rests against a circular, inner circumference of the hollow ring saw blade 1.

[0030] Description of the ring saw blade 1 Based on the intended use and the cylindrical symmetry of the ring saw blade 1, the axis of rotation 4 and one to the axis of rotation 4vertically oriented cutting plane E one. The intersection point of the axis of rotation 4 and cutting plane E falls with the geometric center or center of gravity of the ring saw blade 1 together. The cutting plane E corresponds to the plane in which the ring saw blade 1 a workpiece, substrate, etc. cuts. In the following description, the directions axial and radial refer to the axis of rotation. 4, Unless explicitly stated otherwise, a radially inner element is closer to the axis of rotation. 4 arranged like a radially outer element, which conversely is closer to the outer circumference of the ring saw blade 1 is arranged.

[0031] The ring saw blade 1 has a hollow-circle-shaped, flat support 7. The hollow-circle-shaped support 7 is in the radial direction through an outer circumference 8and an inner circumference 9 limited. The outer dimensions 8 and the inner circumference 9 are concentric and symmetrical to the axis of rotation 4. The inner circumference 9 is circular, the outer circumference 8 is preferably circular or approximately circular. The outer circumference 8 runs at a distance of an outer radius 10 to the axis of rotation 4. The inner circumference 9 is analogous to an inner radius 11 in relation to the axis of rotation 4 described. A width of the support. 7 denotes the difference in the outer radius 10 to the inner radius 11. A ratio of the inner radius 11 to the outer radius 10 is preferably greater than 50%, e.g., greater than 66%. A concave frontal surface. 14 and a concave back side 15 close the carrier 7along the axis of rotation 4 off. The back 15 is preferably flat and unstructured. The reverse side 15 can be parallel to the cutting plane E be. The front side 14 is preferably essentially flat and preferably parallel to the cutting plane E. A height 16 of the flat carrier 7, i.e., its dimension along the axis of rotation 4, is significantly less than the radii.

[0032] The front side 14 of the carrier 7 has an essentially flat surface, typically parallel to the cutting plane. E running, main area 17 and at least one ring-shaped (guide) groove 18. The guide groove 18 is concentric to the inner circumference 9 of the carrier 7, dh runs at a constant distance around the axis of rotation 4. Guide groove 18is largely rotationally symmetrical. A profile of the guide groove 18 is constant along the revolution around the axis of rotation. The profile denotes the cross-section along the axis of rotation. 4 contained level, e.g. level III-III as in Fig. 3 The profile of the depicted guide groove 18 has a radially internal guide flank 19, a radially outer flank 20 and one between the leading flank 19 and outer flank 20 arranged grooved floor 21. The grooved floor 21 forms the deepest area of ​​the guide groove 18, i.e. the groove bottom 21 is the one on the back 15 next area of ​​the groove 18. The depth 22 the guide groove 23 denotes the distance of the groove bottom 21 to the main area 17 Front side 1. The exemplary groove base 21is flat and parallel to the cutting plane E. In other embodiments, the groove bottom can be 21 be a circular line without extent, in which the guide flank 19 and the outer flank 20 touching each other. The leading flank 19 and the outer flank 20 Each runs from the main area 17 to the groove floor 21.

[0033] The leading flank 19 rises along a radial direction towards the axis of rotation 4 in the axial direction from the groove bottom 21 to the main area 17 on. The leading flank 19 is cone-shaped. The descriptive cone 24 is symmetrical to the axis of rotation 4, One apex of the cone lies relative to the cutting plane. E on the same side as the front 14 and the guide groove 18. Half an opening angle 25 of the cone24 The angle is less than 30 degrees, preferably less than 25 degrees, and greater than 10 degrees, preferably greater than 15 degrees. The guide flank 19 is steep relative to the cutting plane E, however, without being vertical.

[0034] The outer flank 20 falls along a radial direction towards the axis of rotation 4 in the axial direction from the main surface 17 of the frontal side 14 to the groove floor 21 off. The flank 20 runs continuously below or on a cone 26, the one through the leading flank 19 and depth 22 the guide groove 18 is predetermined. This limiting cone 26 stands perpendicular to the conical guide flank 19 and runs through the lowest point of the leading edge 19. Below here refers to the flank 20 side of the back 15 from the cone26 is. The cone 26 It thus runs through the cavity of the guide groove 18 and in the direction of the axis of rotation 4 only on the leading flank 19 into the carrier 7 one. The leading flank 19 is continuously above the cone's surface. The far side 20 It can be designed in different ways. The flank 20 Preferably, the slope is monotonically decreasing. In a preferred embodiment, the opposite flank has 20 a cone-shaped form. The described cone is symmetrical about the axis of rotation. 4; One tip of the cone lies on the front side. 14 far side of the carrier 7. Half an opening angle 27 The angle of the cone is greater than 50 degrees, preferably greater than 60 degrees, and preferably less than 75 degrees, e.g., less than 70 degrees. The outer flank 20is therefore significantly longer than the leading edge 19.

[0035] The guide groove 18, 23 It has a strongly asymmetrical profile. The sum of the half opening angles 25, 27 the leading flank 19 and the opposite flank 20 The descriptive cone is preferably larger than 90 degrees, preferably less than 120 degrees. The guide flank 19 contributes only slightly, e.g. less than 20%, to the width 28 the guide groove 18, i.e., their radial dimensions. The main part of the width 28 take the other flank 19 and the groove floor 21 one. The width 28 is at least three times, e.g. at least four times, as large as a depth 22 the guide groove 18, i.e., their dimensions along the axis of rotation 4. The embodiment with an elongated, awayward-facing flank 20is preferred because this hollow profile has a comparatively small cross-sectional area. The beam 7 is therefore more stable. This is especially true if two or more guide grooves are provided. In another embodiment, the groove base occupies at least three-quarters of the groove's width. The other flank can be described by a cone with a similar opening angle to the guide flank, cf. Fig. 4 The front side 14 can have two guide grooves 18, 23 exhibit the two guide grooves. 18, 23 are concentric to each other. In the illustrated embodiment, both guide grooves have 18, 23 the same profile. The guide grooves 18, 23 They differ only in their radius.

[0036] The inner circumference 9 of the carrier 7 serves as a running surface 29. The running surface 29It can be blunt or rounded, or preferably have a trapezoidal cross-section. The running surface 29 has the form of a solid of revolution, whose axis of symmetry coincides with the axis of rotation 4 coincides.

[0037] When cutting a substrate with the ring saw blade 1 the ring saw blade 1 in the cutting plane E into the subsurface. Along the outer perimeter. 8 of the carrier 7 are the cutting elements 3 in the cutting plane E arranged. The cutting elements 3 are located in a radial direction from the support 7 off. Furthermore, the cutting elements are 3 also in both axial directions relative to the support 7 before. The cutting elements 3 are therefore thicker than the carrier 7, dh have a larger dimension along the axis of rotation 4. The cutting elements 3The cut slot is sufficiently wide so that the carrier 7 can be inserted into the slot. The cutting elements 3 They can be abrasive or cutting. For example, the cutting elements contain diamond particles or similarly hard grains embedded in a matrix. The carrier 7 is preferably made of steel.

[0038] The ring saw 2 is preferably a handheld machine tool or hand-held power tool. The ring saw 2 has a tool holder 5 for guiding a ring saw blade 1. An engine 30 is used to drive the device in the tool holder 5 guided ring saw blade 1. The engine 30 is in a machine housing 31 arranged. One simple movement 32 for holding and guiding the ring saw 2 during sawing, something is happening to the machine housing 31 arranged. The ring saw2 It preferably has two handles or one handle that can be gripped with two hands. An example of a handle is designed as a bar. The handle 32 is on a machine housing 31 the ring saw 2 arranged.

[0039] The tool holder 5 The user can lock and unlock the ring saw blade without tools. 1 to insert or remove. The tool holder 5 is based on several rollers which are located on opposite side surfaces 14, 15 of the ring saw blade 1 The tool holder 5 has a recording room 33 for the ring saw blade 1, which preferably through a hood 34 is covered. The user can remove the hood. 34 from the machine housing 31 remove or opposite the machine housing 31unfolding, swiveling, etc. Opening and closing the hood 34 as well as unlocking and locking the tool holder 5 can be achieved, for example, by an operating lever 35 take place.

[0040] The following description of the tool holder 5 refers to their locked position, as used in the operation of the ring saw 2 is used in the workplace in a similar way ( Fig. 5 ).

[0041] The tool holder 5 has a recording room 33 for the ring saw blade 1. The recording room 33 is preferably along the axis of rotation 4 through a floor 36 and a roof 37 and in a radial direction through a side wall 38 enclosed. The ground 36 is on one side, the roof 37 on the opposite side of the cutting plane E arranged. floor 36 and roof 37run essentially along the cutting plane E. The side wall 38 runs circumferentially around the axis of rotation 4 and can be cylindrical in shape. The recording space 33 has an entrance opening 39 and an exit opening through which the ring saw blade 1 into the recording room 33 can enter or exit. The floor 36 can be through an outer surface of the machine housing 31 be educated. The roof 37 can be through an inner surface of the hood 34 be educated. The recording room 33 is preferable to the machine housing 31 Designed to be dustproof and waterproof for electric motors 30, transmission 40, etc. the ring saw 2 opposite the ring saw blade 1 to protect against introduced sawdust or water.

[0042] The tool holder 5 the ring saw 2is within the recording room 33 arranged. The tool holder 5 based on leadership roles 41, 42 and guide rollers 43, 44. The leadership roles 41, 42 are on one side of the cutting plane E, the guide rollers 43, 44 on the opposite side of the cutting plane E arranged. The exemplary leadership roles 41, 42 protrude from the ground 36 into the recording room 33 before. The exemplary guide rollers 43, 44 protrude from the roof 37 into the recording room 33 before. The leadership roles 41, 42 engage the guide grooves 18, 23 of the ring saw blade 1 one. The guide rollers 43, 44 lie on the preferably smooth back side 15 of the ring saw blade 1 The exemplary ring saw 2 has two leadership roles 41, 42, which along a direction of rotation 45around the axis of rotation 4 are arranged in an offset pattern. Other embodiments have only one guide roller or up to four guide rollers. The guide rollers 43, 44 are the leadership roles 41, 42 preferably arranged opposite each other, i.e. in the same angular position around the axis of rotation 4. The couple in a leadership role 41 and an opposing guide roller 43 The ring saw blade is jammed 1 an axial distance between the guide roller and itself. 41 and guide roller 43 corresponds to the thickness 16 of the intended or inserted ring saw blade 1.

[0043] The leadership role 41 has two concentric rolling elements 46, 47, which around an axis of rotation 48 are rotatably mounted. The axis of rotation 48 and the rolling element 46 are inclined relative to the cutting plane E in such a way that one of the rotation axis 4facing section of the rolling element 46 into the guide groove 18 intervenes. One that is displaced from the axis of rotation. 4 far side of the rolling element 46 is accordingly from the ring saw blade 1 spaced apart along the axial direction. The rolling element 46 has a rotationally symmetric surface 49. The exemplary surface area 49 It is cylindrical in shape. The lateral surface 49 is due to the guide groove 18 of the ring saw blade 1 on. The driven ring saw blade 1 moves the rolling element 46, ditto the leadership role 41. The inclined orientation of the leadership role 41 enables frictionless or low-friction movement of the guide roller 41 through the ring saw blade 1. The low friction increases the efficiency of the ring saw. 2 and service life of the guide rollers 41.

[0044] The leadership role 41 or the rolling elements 46, 47 the leadership role 41 are force-free and have low friction around the axis of rotation 48 rotatably mounted. The guide roller 41 It is not directly caused by the engine 30 driven. However, the leadership role is being... 41 by being carried along via the ring saw blade 1 moved. The large ratio of the diameter of the ring saw blade 1 to the diameter of the rolling element 46 requires high rotational speeds of the rolling element 46. The rolling element 46 is therefore preferably in a low-friction bearing 50, e.g. a ball bearing, mounted to reduce friction losses due to the rapidly rotating guide roller 41 to avoid. For example, the rolling element 46 mounted in a ball bearing.

[0045] The axis of rotation 48 is, as mentioned, opposite the cutting plane E inclined. The axis of rotation48 can be used with the axis of rotation 4 lie in a plane. In the illustrated embodiment, the axis of rotation is 4 and axis of rotation 48 Arranged at an angle. Axis of rotation. 4 and axis of rotation 48 They do not intersect and are not parallel. The axis of rotation 4 next point of the axis of rotation 48 lies on the same side of the cutting plane E how the leadership role 41. Starting from the leadership role 41 the axis of rotation 48 in a radial direction towards the axis of rotation 4 to and moves away from the cutting plane. E and the frontal side 14 of the ring saw blade 1. The inclination of the axis of rotation 48 opposite the cutting plane E This is transferred to an inclination of the rolling element. 46, the increasing distance from the axis of rotation 4 a greater distance to the cutting planeE exhibits the angle of inclination. 51 the axis of rotation 48 opposite a perpendicular to the cutting plane E is less than 30 degrees, preferably less than 25 degrees, and greater than 10 degrees, preferably greater than 15 degrees. In the case of the exemplary cylindrical rolling element... 46 is the angle of inclination 51 equal to the inclination of the leading edge 19, the one for the ring saw 2 intended ring saw blades 1.

[0046] The number of rolling elements 46, 47 is related to the number of guide grooves 18, 23 adapted to the intended ring saw blades 1. The illustrated and preferred embodiment has two rolling elements. 46, 47. Other embodiments have up to four rolling elements. The rolling elements 46, 47 are arranged coaxially and around the same axis of rotation 48 rotatably mounted. The radii of the rolling elements 46, 47 or their lateral surfaces 49are different. The inner guidance groove 18 is further from the axis of rotation 48 spaced like the outer guide groove 23 of the inserted ring saw blade 1. Accordingly, the rolling element 46 belonging to the inner leadership groove 18 a larger radius than the rolling element 47 belonging to the outer guide groove 23. The smaller rolling element 47, at least its outer surface, belonging to the outer guide groove 23, is along the axis of rotation. 48 compared to the larger rolling element 46 belonging to the inner leadership groove 18 in the direction of the cutting plane E The offset between the smaller rolling element is significant. 47 and the larger rolling element 46 is such that their axis of rotation 4The facing sections are equidistant from the cutting plane E. The offset is trigonometrically determined by the difference in radii and the angle of inclination. 51 specified. The two rolling elements 46, 47 They preferably engage to the same depth or approximately the same depth in the guide grooves. 18, 23 a.

[0047] The smaller rolling element 47 rotates due to its smaller radius and the larger circumference of the outer guide groove 23 significantly faster than the larger rolling element 46. The smaller rolling element 47 is therefore preferably not directly in the machine housing 31 mounted. In a preferred embodiment, the smaller rolling element 47 on the larger rolling element 46 The bearing, e.g., a ball bearing, is only stressed with regard to the differential velocity of the two rolling elements. The larger rolling element 46is in one of the machine housings 31 fortified storage 50 stored. The ring saw blade 1 During sawing, it is supported by its guide grooves 18 in a radial direction 68, i.e. in the cutting plane E, in leadership roles 41 off. The leadership roles 41 The forces are transferred directly to the machine housing 31.

[0048] Exemplary leadership roles 41 are in the machine housing 31 stored. The rolling elements 46, 47 protrude into the recording room 33 into it. The rolling elements 46, 47 are exposed to dust and water. To prevent dust and water from entering the machine housing 31 at least the rolling elements penetrate. 46, 47 the leadership role 41 opposite the machine housing 31 encapsulated. The rolling elements 46 are in a pot 53 arranged, which is opposite the machine housing 31sealed and connected to the recording room 33 is open. The pot 53 or the inside of the pot 53 for example, it is cylindrical and coaxial to the axis of rotation 48 the rolling element 46 trained. The pot 53 has one of the recording room 33 facing opening 54, through which the rolling elements 46, 47 into the recording room 33 enter. The opening 54 lies on the same plane as the ground 36. The preferably opposite the cutting plane E and the ground 36 inclined rolling elements 46, 47, can be fully or partially within the recording space 33 be arranged. For example, only a segment of the rolling elements closer to the cutting plane E protrudes. 46 through the opening 54 into the recording room 33. This segment contacts the ring saw blade. 1. The remaining segment can be accessed through the floor. 36opposite the recording room 33 be concealed. The corresponding opening 54 of the pot 53 is, for example, slot-shaped or circular segment-shaped, corresponding to the cross-sectional shape of the inclined rolling element. 46 with the level of the ground 36. The volume of the pot 53 The surface area is as small as possible to prevent dust, dirty water, etc. from accumulating in it. The volume of the pot 53 is, for example, a maximum of three times, e.g. a maximum of two times, e.g. a maximum of one and a half times, as large as the volume of the rolling element. 46, 47 the leadership role 41. The diameter of the pot is approximately equal to the diameter of the larger rolling element. 46, e.g. a maximum of 30% larger.

[0049] The guide roller 43 has a rolling element 55, which revolves around an axis of rotation 56 is rotatably mounted ( Fig. 5 ). The rolling element 55has a cylindrical or preferably a conical outer surface 57. The lateral surface 57 is parallel to the cutting plane E aligned, at least during operation or with the tool holder locked 5. The ring saw blade 1 lies on the lateral surface 57 parallel to the cutting plane E on or is formed by the lateral surface 49 supported. The axis of rotation 57 is largely radial to the axis of rotation 4 Arranged in an oriented manner. The rolling element 55 This allows for low friction on the rotating ring saw blade 1 roll off. Analogous to the guide rollers is the guide roller. 43 Mounted with low friction and no force. The preferred rolling element. 55 has a cone-shaped outer surface 55. The radius of the rolling element 55 increases with decreasing distance to the axis of rotation 4ab. Preferably the ratio of radius of the rolling element 55 to the distance to the axis of rotation 4 along the axis of rotation 56 constant or approximately constant. A deviation from a mean value of the ratio is less than 2%. The lateral surface area 57 is described, for example, by a cone whose half-opening angle is between 2 and 5 degrees. The angle of inclination 58 the axis of rotation 57 opposite the cutting plane E is equal to half the opening angle. The axis of rotation 57 the guide roller 43 preferably lies in a plane with the axis of rotation 48 the opposing leadership role 41. The plane is also perpendicular to the cutting plane. E or parallel to the axis of rotation 4. Even if the outer surfaces of the guide roller 41 and guide roller 43Because the axes of rotation are inclined towards each other, no or only slight shear forces result between the guide flanks due to their identical orientation. 19 and back 15.

[0050] In the illustrated and preferred embodiment, the tool holder 5 two couples from leadership roles 41 and guide roller 43. The axis of rotation 48 the leadership role 41 and the pivot axis 56 of the guide roller 43 Each pair lies in a plane. The two planes intersect in a line. K, which are parallel to the axis of rotation 4 is. The line K can on the axis of rotation 4 lie or to the axis of rotation 4 be offset. This reflects the possibility of this ring saw. 2 Ring saw blades 1 to be able to accommodate objects of varying diameters. Since the position of the axis of rotation 4 through the guide grooves18 of the ring saw blade 1 The position of the axis of rotation is defined. 4 relative to the ring saw 2 only within the scope of the intended ring saw blades 1 The axis of rotation is predetermined. Regardless, the axis of rotation is... 4 A sufficiently defined reference is needed for directional information.

[0051] The tool holder 5 can be unlocked without tools to remove the ring saw blade 1 to be removed. According to one embodiment, it is provided that the guide rollers 43 from the cutting plane E and, if necessary, the inserted ring saw blade 1 can be removed to fix it along the axis of rotation. 4 to lift. The guide rollers 43 are, for example, on the inside of the hood 34 suspended, as schematically in Fig. 6 shown. On the hood 34 can swivel bearings 59 be attached, in which the guide rollers44 around the axis of rotation 56 are mounted on rotating bearings. With the hood closed 34 The guide rollers are located 43 on the ring saw blade 1 on, the tool holder 5 It is locked as described above. Opening the hood 34 The guide rollers will be 43 from the cutting plane E and possibly from the inserted ring saw blade 1 removed. In the exemplary embodiment, the guide rollers are removed. 44 together with the hood 34 opposite the cutting plane E swiveled. The tool holder 5 is unlocked and the ring saw blade 1 can be removed. Preferably, a releasable lock is provided to prevent accidental opening of the hood. 34 and prevents the tool holder from being unlocked.

[0052] The drive of the ring saw 2 The drive wheel includes 6,the exemplary electric motor 30 and a gearbox 40, that the electric motor 30 with the drive wheel 6 couples ( Fig. 7 Instead of the electric motor 30 Other engines, e.g., combustion engines, can be used. The drive wheel 6 is in the cutting plane E and eccentric to the axis of rotation 4 arranged. A drive axle 60 of the drive wheel 6 is to the axis of rotation 4 preferably the drive axle 60 and the axis of rotation 4 parallel. The drive wheel 6 rolls on the running surface 29 of the ring saw blade 1 from, i.e. at the inner circumference 9 of the carrier 7. A diameter of the drive wheel 6 is correspondingly smaller than the inner radius 11 the one for the ring saw 2 intended ring saw blades 1. The gearbox 40It may include various components for adjusting speed or torque, safety clutches, etc.

[0053] The drive wheel 6 preferably in the cutting plane E move to remove the ring saw blade 1 from the tool holder 5 to facilitate the movement. For example, the shifting is achieved by an angle gear. 40 with a drive-side pinion 61 and an output-side crown gear 62 enables ( Fig. 7 The crown wheel 62 characterized by teeth 63 out, which run along the drive axle 60 from a base plate 64 protrude. The teeth 63 are to one of the drive axle 60 arranged in a rotationally symmetrical, e.g. cylindrical, cavity. The teeth 63 They can be cylindrical, prismatic, or of other shapes. In a preferred embodiment, the teeth have 63a prismatic shape whose triangular, prismatic base is tangential to the circumference of the crown wheel 62 or another circle around the drive axle 60 is oriented. The drive wheel 6 and the crown wheel 62 are in a warehouse 65 around the drive axle 60 The bearing block is rotatably mounted. 66 is on a sled 67 mounted, which is along a radial direction 68, parallel to the cutting plane E It is movable. The sled 67 is parallel to an axis 69 of the drive-side pinion 61 movable. The sled 67 can be done, for example, via a rod system 70 to an operating lever 35 coupled, via which the user can control the sled 67 can be moved. Preferably, a releasable lock is provided which prevents the carriage from shifting. 67in the locked position of the tool holder 5 fixed.

[0054] The user can adjust the tool holder 5 preferably by means of an actuating lever 35 lock ( Fig. 8 ) or unlock ( Fig. 10 The operating lever 35 has a closing position ( Fig. 8 ), in which the tool holder 5 is locked, and an opening position ( Fig. 10 ), in which the tool holder 5 is unlocked. In the opening position of the operating lever. 35 is the contact of the guide rollers 43 with the ring saw blade 1 The contact of the drive wheel is also preferably eliminated. 6 to the ring saw blade 1 lifted. The ring saw blade 1 lies loosely on the guide rollers 41 on, from which the user can lift and remove it. When inserting a new ring saw blade 1The user places these with the guide grooves. 18 on leadership roles 41 open. The guide grooves 18 already ensure correct alignment of the ring saw blade 1 in the cutting plane E. The guide rollers 43 become responsive to the closing position of the operating lever 35 in contact with the ring saw blade 1 brought and thus the tool holder 5 locked. Preferably, the drive wheel is locked in the closed position. 6 in contact with the ring saw blade 1.

[0055] The hood 34 preferably conceals the tool holder 5 and the drive wheel 6. The leadership roles 41, the guide rollers 43 and the drive wheel 6 are with the hood open 34 accessible to the user, so that the user can access the ring saw blade 1 can be removed or inserted. The hood 34preferably according to the opening and closing positions by the actuating lever 35 opened and closed. The operating lever 35 can also the hood 34 and the tool holder 5 manipulate.

[0056] An example of an operating lever 35 and a mechanism 71 for manipulating tool holders 5 and hood 34 is related to Fig. 8 bis Fig. 10 The operating lever is shown. 35 locks into the closed position. One of the tool holders. 5 or hood 34 The outgoing force pushes the actuating lever. 35 preferably in the closing position. In other versions, the operating lever can 35 The user can fix it in the closed position by means of a pin or similar device.

[0057] The hood 34is in the closing position of the operating lever 35 closed. The hood 34 is around a swivel joint 72 opposite the machine housing 31 It is mounted on a swivel joint. 72 is stationary in the machine housing 31 arranged.

[0058] The hood 34 preferably has a closure which prevents the hood from accidentally opening. 34 prevented. The lock must be opened by the operating lever. 35 can be released. In the closed position, the lock is secured by the operating lever. 35 Locked. An example of a lock is based on a bolt. 73, which goes into a bag 74 on the machine housing 31 intervenes. The bar 73 is, for example, in the radial direction 68 protruding nose on the hood 34 trained. The accompanying bag 74 on the machine housing31 has one in the radial direction 68 A recessed indentation, preferably designed to fit snugly against the nose. The bar 73 It's because of the bag 74 in a circumferential direction around the pivot joint 72 on. This allows the pivoting movement around this pivot joint. 72 inhibited. The bar 73 can along the radial direction 68 from the bag 74 be removed. 73 and bag 74 no longer overlap along the circumferential direction around the pivot joint 72 and the restriction of the swiveling movement is lifted. For example, the hood is used for this purpose. 34 along the radial direction 68 in the machine housing 31 Adjustable. The hood 34 is via a slotted hole 75 at the swivel joint 72 created. The elongated hole 75 preferably runs inclined to the radial direction68. The hood 34 can therefore around the swivel joint 72 swiveled and a short distance along the radial direction 68 can be moved. The lock is closed when the swivel joint 72 at the end of the elongated hole near the closure 75 is in contact, and the closure is open when the swivel joint 72 at the end of the elongated hole furthest from the closure 75 is attached. The operating lever 35 shifts the hood 34 opposite the swivel joint 72, such that in the closed position of the hood 34 the closure is closed. Starting from the closed position to an intermediate position ( Fig. 9 ) pulls the operating lever 35 the hood 34 opposite to the radial direction 68 and pulls the bolt 73 out of the pocket 74. Starting from the intermediate position to the opening position, the hood34 around the swivel joint 72 swivelled. Together with the hood. 34 The guide rollers will be 43 opposite the cutting plane E and, if necessary, the ring saw blade 1 shifted.

[0059] The operating lever 35 is connected to the frame 70 to move the drive wheel 6 coupled. The movable drive wheel 6 can be achieved through a spring 76 be pre-tensioned into the unlocking position. For example, the spring presses 76 onto the frame 70 in the radial direction 68 towards the axis of rotation 4. The operating lever 35 In its open position, the linkage 70 free, which is driven by the spring 76 moved into the unlocking position ( Fig. 9 ). When locking by the operating lever 35 pushes an auxiliary arm 77 of the operating lever 35the frame 70 opposite to the radial direction 68. The auxiliary arm 77 is preferably from the linkage 70 decoupled as long as the guide rollers 43 the ring saw blade 1 Do not touch the guide grooves. 18 They can therefore operate undisturbed by a radially acting force on the guide rollers 41 resting and the ring saw blade 1 align. Only once the guide rollers 43 the guide grooves 18 to the guide rollers 43 Pressing and fixing, the radial forces are transferred through the drive wheel. 6 initiated. The auxiliary arm 77 for example, via a swivel joint 78 on the machine housing 31 be installed. The operating lever 35 swivels the auxiliary arm in response to its position 77 into different positions.

[0060] The exemplary mechanics 71includes a four-joint mechanism that controls the actuating lever 35 to the hood 34 and the machine housing 31 be attached. The hood 34 and the auxiliary arm 77 are, for example, at fixed joints 72, 78 installed. The operating lever 35 is attached to one of the hoods 34 joint that moves with it 79 and one of the auxiliary arm 77 joint that moves with it 80 coupled.

[0061] The ring saw blade 1 is flushed during operation by a water flush 81 Rinsed with water. The water cools the cutting elements. 3. Cooling is particularly important for the heat-sensitive diamond-containing cutting elements. 3 necessary. A disadvantage of using water for cooling is that the water mixes with the dust produced during sawing to form a sludge. The sludge is carried by the ring saw blade. 1partially taken in and fed into the ring saw 2 transported. The abrasive mud contributes to wear and tear, especially on moving parts.

[0062] One embodiment of the ring saw 2 It reduces wear and tear through the use of water. The water is contained within the intake chamber. 33 the tool holder 5 adjacent to the leadership role 41 supplied. The still clean water flows around the rolling elements. 46, 47 the leadership role 41. The mechanically stressed contact areas can be kept free of sludge, or at least the sludge ingress into the contact areas is reduced. In a preferred embodiment, the rolling elements are located 46, 47 in the direction of water flow in front of the recording chamber 33. The water flows around at least one section of the rolling elements. 46, before the water comes into contact with dust, mud, etc. in the recording room 33 reached.

[0063] The water is supplied by an external water supplier. 82 Provided. The water supply 82 This can include, among other things, a filled tank or flowing water from a public or private water supply network. The water supply 82 It can collect, filter, and reuse the used water. The water is preferably under pressure, for example, due to an elevated tank position or a pressure-boosting pump. The ring saw 2 has a water connection 83 for connection to the water supply 82. Channels 84 in the ring saw 2 divert the water from the water connection 83 into the recording room 33 the tool holder 5. The water preferably enters at or near the guide rollers. 41 into the recording room 33 one. For example, the water is poured over the pot. 53supplied, in which the rolling elements 46, 47 are arranged. The water flows over the rolling elements. 46, 47 into the recording room 33. The rolling element 46 It is therefore located in the direction of flow of the incoming water in front of the recording chamber. 33. In particular, the water flows over the highly stressed mantle surfaces. 49 into the recording room 33. An outlet 85 of the canal 84 for example, on the lateral surface 49 or on one from the recording room 33 far side 86 of the rolling element 46 directed. The canal 84 can have a helical section 87 exhibit the helical section 87 is around the axis of rotation 48 the leadership role 41 arranged. The section 87 For example, one can choose between a bearing block 88 for the outer rolling element 46 and the wall of the pot 53be arranged.

Claims

1. Ring saw (2) having: a tool holder (5) for guiding a ring saw blade (1) in a cutting plane (E), a motor (30), a driving wheel (6) which is arranged for driving the ring saw blade (1) in the cutting plane (E) and is coupled to the motor (30), at least one guide roller (41) which is arranged on one side of the cutting plane (E) in order to guide the ring saw blade (1) from this one side, at least one guide roll (43) which is arranged on an opposite side of the cutting plane (E) in order to guide the ring saw blade (1) from this opposite side, wherein the at least one guide roller (41) is mounted freely rotatably about a rotational axis (48), and wherein the rotational axis (48) is inclined by 50 degrees to 80 degrees relative to the cutting plane (E), characterized in that the guide roller (41) has two concentric rolling elements (46, 47).

2. Ring saw according to Claim 1, characterized in that the guide roller (41) has at least one rolling element (46) with a rotationally symmetric lateral surface (49).

3. Ring saw (2) according to Claim 1, characterized in that a first one of the rolling elements (47) has a smaller radius than a second one of the rolling elements (46).

4. Ring saw (2) according to Claim 3, characterized in that the first one of the rolling elements (47) is arranged closer to the cutting plane (E) along the rotational axis (48) compared to the second one of the rolling elements (46).

5. Ring saw (2) according to either of Claims 3 or 4, characterized in that the first one of the rolling elements (47) is mounted on the second one of the rolling elements (46).

6. Ring saw according to one of Claims 1 to 5, characterized in that a rotational axis (56) of the guide roll (43) and the rotational axis (48) of the guide roller (41) lie in a plane perpendicular to the cutting plane (E).

7. Ring saw (2) according to one of Claims 1 to 6, characterized in that the rotational axis (56) of the guide roll (43) is inclined relative to the cutting plane (E).

8. Ring saw (2) according to one of Claims 1 to 7, characterized in that a portion of a lateral surface (57) of the guide roll (43) which faces the cutting plane (E) runs parallel to the cutting plane (E).