Title of Invention

A GRINDING SPINDLE DEVICE AND A SAW-BLADE GRINDING MACHINE

Abstract

A grinding machine, which preferably serves in sharpening saw-blades, particularly circular saw-blades, has a machine frame that supports a device for supporting the saw blade and for fixedly clamping the blade and for advancing the saw-blade tooth-by-tooth. The grinding attachment has two spindles or shafts, which operate independently of one another, and are preferably oriented perpendicular to one another, and preferably support separate drives. The grinding attachment is mounted to pivot and be adjusted in three spatial directions. In a selected pivoting position, one of these spatial directions (Z direction) is oriented radially with respect to the saw blade. In this position, the axis of rotation of one spindle is oriented in the circumferential direction, and the axis of rotation of the other spindle is oriented in the radial direction. A grinding attachment of this type permits the hollow-grinding of tooth faces with grinding pencils that have a small diameter. A separate, high-speed motor serves to drive the grinding pencil (FIG.)

Full Text

Grinding spindle and saw blade grinding machine with high frequency spindle. The invention refers to a grinding spindle and saw blade grinding machine, particularly for saw blades, whose saw teeth display a concave face. Saw blade grinding machine, which are used in the maintenance for sharpening of already used saw blades or in production must match in each case with the conditions prevailing at the saw blade or with the shape of tooth to be produced. As per rule, at a tooth of a saw blade particularly in carbide tipped saw blades, back of tooth and tooth face are to be ground. Some times tooth flanks are also ground. Ground shapes differ therein. In some cases it can be as for example desirable to grind the tooth face concave, while in other cases a flat grinding is desired. For generation of a concave grinding at a tooth face a concave face grinding process is known from the DE 4141900 A1 which works with a cylindrical grinding body, whose axis of rotation is oriented mainly parallel to the tooth face surface area. The grinding body is part of a mounted grinding point which is brought into engagement in the centre level or in two positions of engagement with the tooth face shifted against the centre level of saw blade, in order to grind them. Depending on the direction of off- set it"s direction of rotation is selected. The concave grinding of tooth face is required only in a few cases of saw blades, but not in all types. The saw blade grinding machine will however be input as per rule flexible without resetting or rather rechanging. Starting from there, it is the assignment of the invention, to achieve an improvement in the saw blade grinding machine, through which many different types of saw blades to the. extent possible may be processed. This assignment is solved with the grinding spindle as per claim 1 as well as with the saw blade grinding machine as per claim 12. The grinding spindle as per invention shows two shafts, which are combined with drives for different number of rotations. While the first shaft can be provided at their both ends in each case with at least one grinding wheel, at the second shaft arranged between the ends of first shaft a mounted grinding point can be assembled. Preferably the drives of both the shafts are so designed that the number of rotation of first shaft proportions to the number of rotation of second shaft as the circumference of grinding tool of second shaft to the circumference of (larger) grinding wheel of first shaft. The mounted grinding point runs as for example with a number of rotation of 10,000 to 60,000 rotations/ min. Through the assembly of second shaft in an area between the ends of first shaft, that means preferably outside of a cylindrical or cone shaped area, enclosed between the grinding wheels, a compact, stable, with less vibration and even yet permitting a well positioned structure is attained. The high sped grinding tool (mounted grinding point) can be brought without problem into engagement with the tooth face of all most each saw blade. The distance of grinding body of mounted grinding point from the first axis of rotation is preferably at least so large as the radius of larger grinding wheel, in doing so the axes of rotation can cut or cross over. Through it, it is prevented that the grinding wheels come into engagement with saw blades when the mounted grinding point will be active. In case the grinding wheels work, the mounted grinding point is removed from the saw blade. The positioning way of grinding spindle are short in this structure and a quick rational work is made possible. It results a specially compact, rigid structure, when the shafts provided at the grinding head are held to each other in firm spatial arrangement. The shafts provided in the grinding spindle are laid thereby in the support carrier preferably not adjustable to each other. Preferably the drives of both the shafts are separated and consequently are controllable independent to each other. To the drive equipment for the first shaft and the second shaft belong then a first and second drive over which the shafts in each case are driven separately. The second drive is preferably a high speed drive with a number of rotations (as for example 60,000 rotations / minute fixed, which is at least ten times greater than the number of rotations of first shaft (as for example 1000-6000 rotations/ minute). This makes possible the input of grinding tools to one and the same grinding spindle tools to one and the same grinding spindle, whose diameter vary very strongly as for example around more than one order of magnitude. For the positioning it is advantageous, when the first shaft and the second shaft are oriented to each in right angle, cutting each other or off-set to each other. Therein lie both shafts preferably in each case in one plane, which agrees with the saw blade centre level or with one level parallel to this. The saw blade grinding machine shows as per claim 12 and 13 a machine rack, on which all essential components of saw blade grinding machine are supported. The machine rack holds one saw blade carrier which if required in combination with a clamping device is equipped to it to store the saw blade stationary for processing in a processing position. Besides a device is provided to move further the saw blade toothwise and with it to transport the teeth one after the other in processing position. For this a separate feed device, a so called parting finger can be provided. Alternatively, the feed device can also be part of saw blade carrier. It can apply at the teeth of saw blade as also at other locations of saw blade or at the saw blade carrier. Preferably a feed device is used, which can be controllable in variable condition, so that as per requirement feed steps can be adjusted. In a specially preferred design shape, the feed steps are individually controlled, in order to adjust also to one and the same saw blade changing feed steps. For processing of teeth at least one grinding spindle as per invention serves, which shows a support carrier. This can be sub-divided as per requirement (first and second support carrier). The shafts are in each case provided with at least one own grinding body. While one shaft is equipped with one or more number of grinding wheels, the other carries a mounted grinding tool. The first and the second shaft are driven by a drive device, in doing so the drive device preferably is distributed in two separate drives, which are separately controllable. This preferably from a master control device, which also takes over the other control of grinding machine. The grinding spindle is built such, that preferably at one point of time purely only one of the grinding bodies comes in engagement with the saw blade. Correspondingly drive of one shaft in each case is sufficient. The mounted grinding tool is provided for processing of tooth face. The grinding wheel(s) is (are) in first instance provided for processing of back of teeth as also as per requirement of tooth face. The high speed drive for the mounted grinding point can be designed as retrofit kit provided for construction at existing or correspondingly prefitted grinding spindles. A positioning device carried from the machine rack, permits at least two linear adjust directions and optionally one swivelling movement around a swivelling axis B standing vertically on the saw blade and should the occasion arise around a further swivelling axis. Through the swivelling a matching of orientation of grinding wheel and of the mounted grinding point to the back of the teeth and to the tooth face is made possible. Additionally linear axes permit a feed movement. In ideal case three linear axes in each case in right angle to one another are provided. An essential advantage of new grinding machine lies therein, that also saw blades, whose teeth show a concave face can be fully ground in one operation in one set up with a machine. Manual operation is as a rule not required and the positioning ways are short. The positioning device is carried from the machine rack, to make possible a precise allocation and positioning in relation to the saw blade. In place of swivelling axis B the saw blade can also be dealt with an other position, in doing so the grinding spindle remains unswivelled. This can take place through an adjustment of saw blade carrier on an arch shaped or straight track sidewise to a combination between the saw blade carrier and the grinding spindle. Besides the axis of rotation of saw blade in combination with the sidewise adjustment of grinding spindle can replace the B-axis. A control device controls the work of saw blade grinding machine and controls the positioning device as well as the feed device as also the holding device and the drive device. Consequently the total grinding process can run controlled. The preferable flexible control device as well as the above mentioned assembly of other components permits the complete processing of saw blade in one set up in one and the same saw blade grinding machine. The saw blade grinding machine is useful over this flexibly and in versatile ways. For matching to varying saw blade diameter, the saw blade carrier is laid preferably adjustable in the machine rack in order to adjust the distance to the grinding spindle. Alternatively the matching of position of grinding spindle to variable saw blade diameter can be taken up through an an adjustment of grinding spindle. Altogether, with it three linear axes are sufficient for position adjustment. Besides at least one swivelling axis for the grinding spindle is present. In case the saw blade carrier is laid at the machine rack not stationary, but adjustable, it displays preferably an adjustment drive, which is controlled like all other drives likewise by the control device. This makes possible a flexible processing of lots composed out of varying saw blades. In front of grinding spindle preferably a clamping device is provided as holding device for support of saw blades which is firmly supported on the machine rack. The clamping device takes hold of the saw blade in the proximity of teeth under process and is preferably controllable by the control device. The grinding wheel existing on the first shaft is at least provided at it"s circumferential face with abrasive material. Additionally it can be coated at one of it"s flat sides or at both the flat sides with abrasive grains in order to process different areas of saw tooth. The mounted grinding point running with higher and highest number of rotations shows preferably a cylinder or cone shaped grinding body, in doing so it"s radius at an useful execution shape is greater than the thickness of a tooth of saw blade measured in direction of axis. In order to generate a specially deep rounded fillet at the tooth face, the diameter can be smaller than the tooth thickness. Further details of advantageous execution shape of invention are items of subordinate claims, of drawing or of description. In the drawing an execution example of invention has been shown. They show : Figure 1 a saw blade grinding machine in one and simplified perspective representation. Figure 2 the saw blade grinding machine as per Figure 1 schematic representation of function. Figure 3 the grinding spindle of saw blade grinding machine as per Figure 1 in a schematic front view. Figure 4 the grinding spindle as per Fig.3 in processing of a back of tooth, in a schematic plan view. Figure 5 the grinding spindle as per Figure 3 in processing of tooth face by means of a face plate (face grinding) in a schematic plan view. Figure 6 the grinding spindle as per Figure 3 in processing of tooth face by means of a mounted grinding point (concave grinding), in a schematic plan view and Figure 7 the grinding spindle as per Figure 3, in a schematic side view. In Figure 1 a grinding machine is shown which serves as saw blade grinding machine. The grinding machine 1 shows a machine rack 2 which is installed stationary on a not further shown mounted face. The grinding machine 1 serves for grinding of saw blades, particularly circular saw blades 3, as it is shown in Figure 3 purely schematically. For storing of saw blade 3 a saw blade carrier 4 serves, which is located rotatable around an axis of rotation 5. The saw blade carrier 4 shows for pick up and orientation of saw blade 3 an arbour 6 which looms up from a plane seating surface 7 of saw blade carrier 4 and centres the saw blade 3. For fastening of saw blade 3 at the saw blade carrier 4 a clamping 8 serves, which consequently if required in joint operation with further not shown clamping device serves as fastening means. The saw blade carrier 4 is carried from a positioning device 9 which positions the saw blade carrier around the axis of rotation 5 rotatable and additionally displaceable along a direction denoted through an arrow 10. The drive for carrying out displacement movement is not shown further in Figure 2. It is under the control device" 11, with an indicator device 12 and input item 14. The control device 11 controls besides a feed device 15 which is located on the machine rack 2. It serves to stepwise rotation of the saw blade 3 in order to transport in each case a tooth 3a (Figure 3) of the same in processing position. The feed device 15 shows a moveable finger 18 in at least one, preferably two directions 16, 17 which can rotate the saw blade 3 toothwise around it"s axis of rotation 5. The finger 18 is besides positioned around a swivelling axis 5 capable of swivelling, in order to slide over the teeth 3a like a retaining pawl. A (from the control device 11) controlled drive or a spring engage the finger 18 in the teeth intermediate space. Besides one holding device 19 controlled likewise from the control device 11 is provided which serves to it to store the saw blade 3 in static condition for processing of it"s respective tooth and which is carried by machine rack 2. A stationary lower jaw 21 and one moveable upper jaw 23 in direction of an arrow 22 to some extent parallel to the axis of rotation 5 belong to the holding device 19. The jaws 21, 22 can also as per requirement be replaced through a single jaw by a controllable magnet or equivalent. For carrying out of a grinding process of saw blades a grinding spindle 24 serves which is carried by a positioning device 25 and is supported at the machine rack 2. The grinding spindle 24 shows, as evident from Figure 3, two grinding wheels 26a, 26b and a mounted grinding point 27. The grinding wheels 26a, 26b are, as evident from Figure 4 and 5 are provided for grinding process of a back of tooth 28 and of a flat (plane) tooth face of a tooth 29 of saw blade 3, while the mounted grinding point 27 as per Figure 6 serves for processing of a tooth face 21. The grinding wheels 26a, 26b are carried by a shaft 33, which are stored rotatable at a position carrier 34 around on axis of rotation 35 or is alternatively fixed and at whose ends they are fastened. The position carrier 34 is combined with a base plate 36, which is carried by the position device 25. In an execution shape the base plate is swingable around an axis 0 (Figure 1), which shows somewhat parallel to the saw blade 3 towards it"s centre and which is consequently some what parallel to the direction denoted through the arrow 10. At the position carrier 34 a carrier 37 (Figure 3) is fastened, which shows a spindle or shaft 38. This is located rotatable around an axis of rotation 39 and carries at one end the mounted grinding point 27. The axes of rotation 35, 39 are preferably oriented at perpendicular to each other and are arranged in parallel to each other levels Al, A2 (Figure 1) parallel to the saw blade 3. As per requirement, the base plate 36, as indicated in the Figures 3 and 4 to 6 through an axis 41, can be stored swingable (arrow 42 in Figure 2). With it, the axis of rotation 35 can tilt against : the saw blade level, which however is not required in each case. The levels Al and A2 have a distance from each other which corresponds approximately to sum out of grinding wheel radius the mounted grinding point radius and the thickness of saw blade. Besides the mounted grinding point 27, as it is indicated in Figure 7 through a dashed line A3 is arranged below the plane grinding surface of grinding wheel 26b (in relation to Y-direction). The carrier 37 forns with a spindle motor 43 (high frequency spindle) and with the mounted grinding point 27 a grinding module 44, which is preferably firmly installed. In the grinding module 44, cooling channels are provided for cooling of spindle motor 43 developed as high capacity drive. Besides channels supply as per requirement a cooling lubricating fluid to the mounted grinding point 27. The drive of first shaft 33 takes place over a drive equipment, to which a motor 33a held by the position carrier 33 and a gear 33b (toothed belt) belong. The drive of shaft 33 as well as the drive of shaft 38 exists under preferably the control device 11. With it both shafts 33, 38 can be driven as per requirement and independent from each other. The positioning device 25 shows a carrier 51 which is located capable of swivelling in an execution form around a swivelling axis B oriented parallel to the axis of rotation 5. A corresponding^ not shown further, swivelling drive for fixing selected swivelling position exists below the control of control device 11. The carrier 51 is provided with a linear guide, which guides a sliding frame 52 in a Z-direction (Fig.2) away from the swivelling axis B and on this to or in X-direction (Figure 1) adjustable linear. A corresponding Z-drive 53 (X-drive) is likewise carried by the carrier 51. On the sliding frame 52 a further carrier 54 displaceable in X-direction (Z-direction in Figure 1) is stored which is adjustable consequently approximately in direction of circumference in relation to saw blade 3 (depending on swivelling position of carrier 51). A corresponding adjustment drive is not shown further and exists under the control 11. At the carrier 54, vertically in Y-direction adjustable a sliding frame 55 is stored, which carries the base plate 36. The sliding frame 55 is positioned by an adjustment drive 55a which is controlled by the control device 11. The so far described grinding machine 1 works as it follows : For processing of saw blade 3 at it"s tooth face area 31, this is arranged on the saw blade carrier 4 and is firmly clamped with the fastening medium 8. The feed device 15 positions the saw blade 3 now in a desired first grinding position, as it is as for example shown in Figure 6. With the holding device 19, the saw blade 3 now is firmly clamped in this position and grinding spindle 24 (particularly in Y-direction) is so positioned that the mounted grinding point 27, as shown in Figure 3 remains before the tooth 29. The axis of rotation 39 is oriented parallel to the tooth face area. The drive 43 is controlled by the controlled device 11 such that the mounted grinding point 27 runs with higher number of rotations. The grinding wheel can remain therein in static condition. After the axis of rotation 39 preferably is oriented mainly parallel to the Z-axis, the drive 53 is activated, so that the grinding spindle 24 performs a movement in Z-direction and with it longitudinally of axis of rotation 39 of mounted grinding point 27. This can take piace in saw blade centre. As per requirement through adjustment of Y-axis also a displacement of saw blade centre level can be reached. The grinding process of tooth face area 31 can as per requirement be repeated in different Y-positioning, in order to generate a cutting face area shape which deviates from the shape of case face of mounted grinding point 27. Additionally or in place of operation of Y-axis, the Y-axis can also be operated to adjust the mounted grinding point 27 vertical. Besides a movement in X-direction can take place, which agrees mainly with the direction of circumference of saw blade. Due to high displacement (in Y-direction) between the mounted grinding point 27 and grinding wheels 26a, 26b around preferably at least one grinding wheel radius the grinding wheel 26b stands above saw blade, so that the grinding spindle 24 can be moved and positioned unrestricted without that the grinding wheels 26a, 26b come in engagement undesired with the saw blade 3. After the grinding of tooth 27, at it"s tooth face the grinding spindle 24 is driven in Z-direction somewhat to outside and the holding device 19 is opened. With the feed device 15, the saw blade 3 is further connected around a tooth and thereafter is again firmly clamped through the holding device, after which the next tooth face 31 can be processed. When all tooth face areas of all teeth of saw blade 3 are processed, without compulsorily, changing of saw blade 3, the back face of tooth 28 can be processed. For this the grinding spindle 24 is transported in the position shown in Figure 4 and drops in Y-direction. The axis of rotation 35 is essentially oriented parallel to the back of tooth 28 under grinding in each case. An activation in direction of X-axis, that means parallel to the axis of rotation 35 (which is preferably oriented parallel to the X-qxis) leads, now to grinding of back of tooth 28. In case these are to be built plane, additionally a movement in Y-direction can be executed. As for example, this can take place when the total back of tooth 28 stands in engagement with the face of circumference of grinding wheel 26a. In case a back of tooth 28 is ground, the control device 11 activates the clamping device 19 and the feed device 15, in order to bring the next tooth in processing position and again to clamp it firmly there. In this way all back of tooth are processed one after the other. Additionally or alternatively to concave grinding of tooth face as per Fig. 6, the tooth face can also be ground plane. The plane grinding can limit on the external area of tooth face or can cover it fully. The grinding process is shown in Figure 5. In case such a plane grinding is not required, the grinding wheel 26b can also be eliminated. Alternatively in place of grinding wheel 26b also the grinding wheel 26a is eliminated, when back of tooth grinding is not required. The grinding spindle shows with it two working levels Al, A2 (Fig.7) which are displaced perpendicular to the saw blade 3 agqinst each other (Y-direction). The displacement is preferably somewhat greater than a radius of grinding wheels 26a, 26b. The working levels Al is assigned to the grinding wheels 26a, 26b while the other working level A2 is assigned to the mounted grinding point 27. Preferably the distance or displacement between the working levels is equal to sum out of (largest to be taken) radius of grinding wheels 26a, 26b and the (largest to be taken) diameter of mounted grinding point. In any case, however the distance is so sized that the grinding wheels 26a, 26b stand at a sufficient safety distance over the saw blade 3, when the mounted grinding point 27 remains in engagement with tooth face in it"s deepest position. The distance between the working levels Al, A2 is particularly shown in Fig. 7. In case without or with less vertical positioning movement it should be managed, the axes 33, 38 can also be arranged in less distance from each other. The grinding body of mounted grinding point 27 is however in any case arranged outside of a volume or area, which is limited between the grinding wheels by the saw blade with the largest admissible diameter, when it is approached in the working level of mounted grinding point at the grinding wheels and does not touch it as yet. Thus the mounted grinding 27 can be brought in engagement with the saw blade, without that the saw blade comes in engagement with the grinding wheels and even then a compact (rigid) structure is reached which permits short actuator travels. The saw blade 3 is ground at all tooth face areas and back of tooth in one set up. Once it is finish ground, it is taken out and is replaced through the next following saw blade to be processed. In case it"s diameter deviates from the diameter of the previously processed saw blade 3, the positioning device 9 for the saw blade carrier 4 in direction of arrow 10 is so adjusted that the teeth located in processing position in each case again remain in area of holding device 19 and of grinding spindle 24. A grinding machine 1, which mainly serves for sharpening of saw blade 3, shows a machine frame 2 which carries a device for storing of saw blades, for stationary static firm clamping of same and for tooth wise further connection. Besides the machine rack 2 carries a positioning device, which guides a grinding spindle. The grinding spindle 24 shows two spindles independent from each other, mainly oriented at right angle to each other, which preferably carry separate drives and are oriented at right angle to each other. The grinding spindle 24 is swingable as well as is positioned in three spatial directions adjustably. In a selected swivelling position one of these spatial directions (Z-directions) is oriented radially to the saw blade 3. In this position the axis of rotation 35 of a spindle is oriented in direction of circumference and the axis of rotation 39 of other spindle is oriented in radial direction. Such a grinding spindle permits the concave grinding of tooth face areas with mounted grinding points of less diameter. For drive a separate high speed motor serves. WE CLAIM 1. A grinding spindle device (24) interposably movable by a positioning means (25) fixedly connected to a saw-grinding machine for grinding of tooth faces (28,31) of atleast one tooth (29) of a saw-blade (3), the device comprising: - a first shaft (33) interposed in a position carrier (34) being rotatable around an axis (35); - a second shaft (38) disposed at a different level and in a spaced- apart relationship in respect of the first-shaft (33), the second shaft (38) being rotatable around an axis (39); - a drive means (43, 53) operably and respectively connected to the first -shaft (33) and the second shaft (38); - the first shaft (33) having atleast one grinding wheel (26a) releasably attached at one end, the second shaft (38) having a grinding tool (27), disposition of which corresponds to an intermediate location over the length of the first shaft (33), the * second shaft (38) is caused to rotate at a speed higher than the speed of the first shaft (33) which being determined in registration with a ratio of the circumferences of the grinding tool (27) and that of the atleast one grinding wheel (26a). 2. The device as claimed in claim 1, wherein the first and second shaft (33,38) are held in firm spatial arrangement to each other. 3. The device as claimed in claim 1, wherein the shafts (33,38) are disposed at the position carrier (34) being non-displacable to each other. 4. The device as claimed in claim 1, wherein the drive means (43, 53) comprises a first and a second drive, the first drive (53) assigned to the first shaft (33) and the second drive (43) assigned to the second shaft (38), and wherein the first shaft (33) and the second shaft (38) are separately driven in each case, preferably, the rotational speed of the second drive (43) being at least ten times higher than that of the first shaft (33). 5. The device as claimed in any one of the preceding claims, wherein the first shaft (33) and the second shaft (37) are oriented at right angle to each other, cutting each other or displaced to each other. 6. The device as claimed in any one of the preceding claim 1, wherein the first shaft (33) is provided at both ends with at least with one grinding wheel (26a, 26b) and wherein the second shaft (38) is connected to the second drive (43) at an area beyond the area being enclosed between the grinding wheels (26a, 26b). 7. The device as claimed in claim 1, wherein at least one of the grinding wheels (26a, 26b) is provided at least at their circumference face with abrasive materials. 8. The device as claimed in claim 1, wherein the abrasive materials are provided atleast at a flat face of the grinding wheels (26a, 26b). 9. The device as claimed 1, wherein at least one of the grinding wheels (26a, 26b) is configured to process the back of tooth (28). 10.The device as claimed in claim 1, wherein the grinding tool (27) is allocated for processing of the tooth face (31) for production of a concave grinding. 11.The device as claimed in any of the preceding claims, wherein the grinding tool (27) is built in a shape of a truncated cone or a cylinder and wherein a half radius of the grinding tool (27) is preferably less than the measured thickness of the tooth (29) of the saw blade (3) in axial direction. 12.A saw blade grinding machine in particular for grinding of circular saw blades (3) having a grinding spindle device as claimed in claims 1 to 11, comprising: - a saw blade carrier (4), movable along the machine rack (2) having an orientation device (6) for selective admission of the saw blade (3) and a fastening means (8) for fastening the saw blade (3); - a feed device (15) movable along the machine rack (2) to transport the saw blade (3) in a processing position of the blade tooth; - a holding device (19) movable along the machine rack (2) for rigidly holding the saw blade (3) in the processing position; - a positioning device (25) movable along the machine rack (2), having at least two linear adjustment directions (X,Z) and which moves the grinding spindle (24); and - a control device (11) for controlling the positioning device (25), the feed device (15), the holding device (19) and the drive means (43, 53). 13. The machine as claimed in claim 12, wherein the saw blade carrier (4) Is adjustable at the machine rack (2) transverse (10) to an axis of ratation (5) of the carrier (4). 14. The machine as claimed in claim 12, wherein an adjustment direction (10) is designed on the grinding spindle (24), to and away from the spindle (24), for adjustment of the saw-blade carrier (4). 15. The machine as claimed in claim 12, wherein an adjustment drive for adjustment of the saw comprising blade carrier (4) is provided which is controlled by the control device (11). 16. The machine as claimed in claim 12, wherein the holding device (19) is switchable between an active condition and a passive condition by the control device (11), and wherein the saw blade (3) is placed in a static and non-rotatabte position in the active condition of the holding device, and released in the passive condition when the saw blade becomes rotatable. 17. The machine as clamed in claim 12, wherein the holding device (19) is a clamping device having a movable clamping jaw (21) disposed firmly at the machine rack (2). 18. The machine as claimed in claim 12, wherein the positioning device (25) has three linear adjustment directions (X, Y, Z) which are oriented at right angle to each other. 19. The machine as claimed in claim 12, wherein the positioning device (25) has a swiveling axis (B) around which the grinding spindle (24) being swingable and wherein the swiveling axis (B) is oriented parallel to an axis (5) of rotation of the saw blade carrier (4). 20. The machine as claimed in claim 12, wherein the saw blade carrier (4) is movable for realization of a relative swinging between the grinding spindle (24) and the tooth (29) transverse to a conceived combination line between the grinding spindle (24) and the axis of rotation (5) of the blade carrier (4). This invention relates to a grinding spindle device (24) interposably movable by a positioning means (25) fixedly connected to a saw-grinding machine for grinding of tooth faces (28,31) of atleast one tooth (29) of a saw-blade (3), the device comprising; a first shaft (33) interposed in a position carrier (34) being rotatable around an axis (35); a second shaft (38) disposed at a different level and in a spaced-apart relationship in respect of the first-shaft (33), the second shaft (38) being rotatable around an axis (39); a drive means (43, 53) operably and respectively connected to the first -shaft (33) and the second shaft (38); the first shaft (33) having atleast one grinding wheel (26a) releasably attached at one end, the second shaft (38) having a grinding tool (27), disposition of which corresponds to an intermediate location over the length of the first shaft (33), the second shaft (38) is caused to rotate at a speed higher than the speed of the first shaft (33) which being determined in registration with a ratio of the circumferences of the grinding tool (27) and that of the atleast one grinding wheel (26a).

Documents:

81-cal-2001-granted-abstract.pdf

81-cal-2001-granted-assignment.pdf

81-cal-2001-granted-claims.pdf

81-cal-2001-granted-correspondence.pdf

81-cal-2001-granted-description (complete).pdf

81-cal-2001-granted-drawings.pdf

81-cal-2001-granted-form 1.pdf

81-cal-2001-granted-form 18.pdf

81-cal-2001-granted-form 2.pdf

81-cal-2001-granted-form 26.pdf

81-cal-2001-granted-form 3.pdf

81-cal-2001-granted-form 5.pdf

81-cal-2001-granted-form 6.pdf

81-cal-2001-granted-letter patent.pdf

81-cal-2001-granted-pa.pdf

81-cal-2001-granted-priority document.pdf

81-cal-2001-granted-reply to examination report.pdf

81-cal-2001-granted-specification.pdf