US3258880A - Sharpening machine for tool-carrying heads - Google Patents

Sharpening machine for tool-carrying heads Download PDF

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US3258880A
US3258880A US397852A US39785264A US3258880A US 3258880 A US3258880 A US 3258880A US 397852 A US397852 A US 397852A US 39785264 A US39785264 A US 39785264A US 3258880 A US3258880 A US 3258880A
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support means
movement
grinding
wheel
axis
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English (en)
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Garin Maurice
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Individual
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G7/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof
    • G05G7/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof characterised by special provisions for conveying or converting motion, or for acting at a distance
    • G05G7/08—Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof characterised by special provisions for conveying or converting motion, or for acting at a distance in which repeated movement of the controlling member moves the controlling member through a cycle of distinct positions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
    • B24B3/027—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters of milling cutters with embedded cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades

Definitions

  • the present invention relates to grinding machines, and in particular to machines for grinding articles such as cutters of the type used in machine tools.
  • machine tool cutters such as conventional tool bits of the type used on lathes, milling cutters, one-piece cutters, cutters which have special cutting tools joined to a base of the cutter, cutters which are intended to machine internal bores, and all other types of cutters which are used in machine tools.
  • the objects of the present invention also include the provision of a grinding machine of the above type which while relatively small and compact nevertheless is exceedingly stable and is capable of grinding not only workpieces conventionally encountered in practice but also unusually large workpieces for which the grinding machine of the invention can be readily adapted with a minimum of inconvenience,
  • the invention includes, in a grinding machine for grinding cutters of machine tools, a base means and a vertically movable support means carried by the base means for vertical movement relative thereto and having a top end portion which is situated above the base means.
  • a rotary support means is carried by the top end portion of the vertical movable support means for turning movement about a substantially vertical axis, and a rockable support means is supported by the rotary support means for rocking movement about a substantially horizontal axis.
  • a work-holding means is carried by the rockable support means for movement with respect thereto along a path which extends parallel to the substantially horizontal axis about which the rockable support means is capable of turning relative to the rotary support means, so that with this construction it is possible to position the work at an infinite number of attitudes within a given space, and the machine of the invention is arranged so that the work is clearly visible to the operator when mounted on the machine of the invention.
  • the machine of the invention includes a lower carriage means which is carried by the base means and an upper carriage means which is carried by the lower carriage means, these carriage means being respectively movable in mutually perpendicular directions, and the upper carriage means carries an angularly movable support means which turns with respect to the upper carriage means about an axis which is substantially horizontal and which extends toward the general location of the work.
  • a rotary wheel-carrying means is carried by the angularly movable support means for rotation about an axis perpendicular to the axis about which the angularly movable support means turns, and this rotary wheel carrying means is adapted to carry a grinding wheel at a location adjacent the work which is to be ground.
  • a means is operatively connected to the vertically movable support means for displacing the latter vertically through a given increment at each actuation of this means which is connected.
  • the rotary wheel carrying means is capable of being displaced along its axis which is perpendicular to the axis about which the angularly movable support means turns.
  • FIG. 1 is a schematic front elevation of one possible embodiment of a grinding machine according to the invention
  • FIG. 2 is an end elevation of the machine of FIG. 1 as seen from the left of FIG. 1;
  • FIG. 3 is a top plan view of the machine of FIG. 1;
  • FIG. 4 is a schematic side elevation, on an enlarged scale as compared with FIGS. 1-3, of structure for setting the machine to carry out either rough-grinding operations or finish-grinding operations;
  • FIG. is a schematic sectional view of the structure of FIG. 4 taken along line 55 of FIG. 4 in the direction of the arrows;
  • FIG. 6 schematically illustrates a structure of the invention for displacing a vertically movable support means through a predetermined increment
  • FIG. 7 shows the structure of FIG. 6 with the parts in a position which they assume at a stage of the operation subsequent to that which is illustrated in FIG. 6;
  • FIG. 8 shows the structure of FIGS. 6 and 7 in a position which the parts assume subsequent to the position thereof illustrated in FIG. 7;
  • FIG. 9 is a partly sectional perspective illustration of an embodiment of the machine of the invent-ion which in minor respects differs from that of FIGS. 1-3, FIG. 9 showing in detail the manner in which the various components of the machine of the invention cooperate with each other;
  • FIGS. 10-16 illustrate various settings of the machine
  • FIGS. l7A-17C show a tool sharpened by the machine.
  • the grinding machine of the invention includes a base means 1 which at a front portion carries an assembly of support means for supporting the work which is to be ground, while at the rear of the base means the latter carries a structure which supports the grinding wheel.
  • a pump and a reservoir of fluid to be pumped thereby In the interior of the base means is situated a pump and a reservoir of fluid to be pumped thereby, this structure not being shown but being accessible through the door 2 which is illustrated in FIG. 1.
  • the base means 1 has a lower portion 3 which directly engages the floor and which has a substantially triangular configuration in order to assure that even relatively large workpieces will be situated above the center of gravity of the machine, so that in this way the stability of the machine of the invention is enhanced.
  • the front of the base means 1 supports a vertically movable support means 50, in the form of a hollow column, for vertical movement, and it will be noted that the top end portion of the vertically movable support means '50 is situated above the base means.
  • a hand wheel 4 is accessible to the operator for manually changing the elevation of the vertically movable support means 50.
  • a rotary'screw 53 is supported for rotation at its top end in a suitable thrust bearing which is fixed to the top Wall of -the base means 1 at the underside of this top wall, so that in this way while the screw 53 can turn about its axis it cannot move along its axis, and the screw 53 extends threadedly through a nut 54 which is fixed to the vertically movable support means 50. Therefore during turning of the screw 53 the vertically movable support means 50 will be raised 'or lowered.
  • the screw 53 fixedly carries a worm-wheel 52 which meshes with a worm 51 which is coaxially fixed to the hand wheel 4, so that when the operator turns the latter the worm 51 and worm-wheel 52 will cooperate to turn the screw 53 and thus raise or lower the vertically movable support means 50.
  • a rotary support means 5 is turnably carried by the top end portion of the vertically movable support means 54) over the base means 1, and this rotary support means 5 can have its angular position relative to the column 50 determined by a suitable scale, as indicated in FIG. 9 at the top of the column 50.
  • the structure is such that the rotary support means 5 will turn about a substantially vertical axis and will have an angular turning range which at a minimum will be approximately 240.
  • the structure of FIGS. 1-3 differs from that of FIG. 9 in a number of different ways, and one of th diiferences is that in the embodiment of FIGS.
  • the scale for determining the angular position of the rotary support means 5 is carried by a side surface of the rotary support means 5 'while a hand crank 6 is available for releasably fixing the rotary support means 5 ata Selected angular position with respect to the substantially vertical axis about which the support means 5 turns.
  • a screw 6 having an hexagonal head is available for releasably fixing the rotary support means 5 in a selected angular position.
  • the axis about which the support means 5 turns coincides with the axis of the column 50.
  • a bellows 7 is connected at its bottom end to the top of the base means 1 and at its top end to a ring which surrounds the column 50, so that during raising and lowering of the latter the exterior thereof which projects above the base means will be protected by the expandible and contractible flexible bellows 7.
  • the rotary support means 5 has in cross section the configuration of a trough or cradle, and in this way the rotary support means 5 serves to support for rocking movement a rockable support means 8 which extends along the rotary support means 5 and which is rockable with respect thereto about a substantially horizontal axis which is normal to the vertical axis of the column 50 along which the latter moves and about which the rotary support means 5 turns.
  • a rotary screw is available to the operator for selecting the inclination of the rockable support means 8.
  • a screw 9 is accessible to the operator and is supported for rotation about its axis which extends horizontally, this screw 9 being, for example, in the form of a worm which meshes with a worm-wheel sec-tion fixed to the bottom of the rockable support means 8 at a portion thereof received in the rotary support means 5, so that by turning the screw 9 the rockable support means 8 can be rocked about its horizontal axis.
  • a work-holding means 10 is carried by the rockable support means 8 on suitable guideways for shifting movement along a straight line parallel to the horizontal axis about which the rockable support means 8 can turn rela' tive to the rotary support means 5, and this holding means 10 includes portions which slidably engage the guides 49 shown in FIG. 9 which support the holding means 10 for movement along the rockable sup-port means 8.
  • the position of the holding means 10 can be releasably maintained by manipulation of a handle 48 which is shown in FIG. 1 and which through a suitable transmission is capable of being moved along the elongated slot 47 formed in the support means 8 and shown in FIG. 1.
  • This work-holding means 10 is formed with a bore 46 which receives part of the workpiece W and which serves for fixing work-piece W to the work-holding means 10 at a selected angular position.
  • the rockable support means 8 has a pair of projecting portions fixed to and projecting laterally from opposed side walls of the rockable support means 8, and these projections 45 include manually operable clamping portions which are capable of selectively clamping a stop 27' on one side or the other side of the support means 8 depending upon the direction the operator selects for progression of the grinding operations along the workpiece.
  • the stop 27' can be releasably clamped to one or the other side of the support means 8 in a position where it necessarily extends perpendicularly with respect to the .axis about which the support means 8 turns, and at its top end the stop 27' has a lateral projection which is adapted to engage a part of the work so as to determine the angular position thereof, and in this way the workpiece is angularly oriented with respect to the vertical axis of the column 50, so that once the angular position of the work is determined by engagement with the stop 27', the successive cuts can be angularly displaced one with respect to the other in accordance with the increments through which it is selected to trun the rotary support means 5 from one operation to the next.
  • FIGS. l3 diagrammatically indicate a workpiece carried by the work-holding means and engaged by the stop 27, this particular workpiece including a circular base mem her to which a plurality of cutting teeth are fixed.
  • a moving means is operatively connected to the vertically movable support means 5 for moving the latter vertically by a predetermined increment at each actuation of the moving means, and a foot-pedal 11 is available to the operator for actuating this moving means to displace the vertically movable support means 50 through a given increment at each depression of the pedal 11.
  • the operator can actuate the pedal 11 so as to control the elevation of the column 50 and thus control the elevation of the rotary support means 5 and the rockable support means 8 carried thereby.
  • the pivotally supported foot-pedal 11 is pivotally connected to the bottom end of a rod 44 which at its top end is fixed to a strap 37.
  • the top end of the strap 37 is pivotally connected to a disk 38 which is freely turable on the rotary screw 51.
  • a toothed ring 36 is fixed to the hand-wheel 4 for rotation therewith, and the ring 36 is provided with ratchet teeth cooperating with a pawl carried by the disk 38 so that the latter acts as a pawl assembly to cooperate with the ratchet teeth 36 for turning the wheel 4, during movement of the pedal 11, in one direction while in the opposite direction the pawl assembly 38 returns to its initial position without turning the hand-wheel 4.
  • the hand-wheel 4 is of course fixed directly to the rotary worm 51.
  • the arrangement is such that the pawl 38 does not engage the ratchet teeth 36 so that the hand-wheel 4 can be turned in either direction for raising or lowering the column 50 since the ratchet teeth 36 will not cooperate with the pawl 38 at this time.
  • the pawl will move into engagement with the teeth 36 for rotating the hand-wheel 4 and the worm 51 therewith in a direction which, for example, will raise the column 50 through a given increment at each actuation of the footpedal 11.
  • FIGS. 6-8 The above means for displacing the vertically movable support means 50 by a given increment at each actuation of the pedal 11 is shown in an idealized manner in FIGS. 6-8 where the ratchet wheel 36 corresponds to the hand-wheel 4 and is fixed to the rotary shaft which represents the shank of the worm 51 and forms a coaxial extension thereof.
  • a lever 37 is freely turnable on the shank 35 and of course corresponds to the strap 37 shown in FIG. 9 while FIGS. 68 illustrate a pawl 38 corresponding to the disc 38 of FIG. 9 and illustrated in FIGS. 68 as pivotally connected at 39 to the lever 37.
  • a spring 40 is connected to the pawl 38 for urging the latter to turn in a clockwise direction, as viewed in FIGS.
  • FIGS. 68 also show a pair of stop members 41 and 42 between which the lever 37 can turn from the position of FIG. 6 to that of FIG. 8, and of course the lever 37 will then return to the position of FIG. 6.
  • the parts are shown in their position of rest in FIG. 6, and it will be noted that in this position the stop 41 maintains the pawl 38 out of engagement with the ratchet wheel 36, and of course in this position of the structure of FIG. 9 there will be no operative connection between the pawldisc 38 and the teeth 36 so that the wheel 4 can be turned in either direction to raise or lower the column 50, as was pointed out above.
  • the lever 37 Upon actuation of the pedal 11 the lever 37 will be raised from the position of FIG.
  • This structure is preferably so designed that at each actuation of the pedal :11 the column 50 will be raised through a predetermined increment, and it is preferred to design the structure so that at each actuation of this moving means the vertically movable support means 50 will be raised by an increment of 0.0-2 mm.
  • This particular feature of the invention is a great advantage to the operator of the machine of the invention. For example if during the operations on a particular workpiece the operator judges that the conditions are such that the elevation of the workpiece should be increased by 0.06 mm, then al that the operator need do is actuate the foot-pedal 11 three times. It is to be noted that this operation does not require the operator to remove his eyes from the work. Furthermore, this operation does not require the operator to actuate any releasable locks, brakes, or the like, so that without requiring any manual operations and without requiring the operator to take his attention away from the work it is possible for the operator at any desired time to actuate the pedal 11 so as to raise the work.
  • the structure of the invention as thus far described above and shown in the drawings is that part of the machine of the invention which supports the workpiece which is to be ground. It is to be noted that the workpiece is supported on top of the work-holding means 10 so that it is clearly visible to the operator at all times. Furthermore, it is possible with this structure of the invention to situate the workpiece at any desired attitude Within va given space conveniently in the immediate vicinity of the operator. As may be seen from FIG. 1 one of the adjustments is a vertical adjust-ment V which can be brought about either manually by rotation of the handwheel 4 or through predetermined increments by actuation of the pedal 11, as described above. Furthermore, as may be seen from FIG.
  • the rockable support means 8 enables the work to be tilted about a horizontal axis in the direction of the dotted arrow I shown in FIG. 2.
  • the work-holding means 10 enables the workpiece to be situated at a selected location along a path parallel to the axis about which the rockable support means 8 turns, and through the use of the bore 46 of the workholding means 10 and the stop 27 the initial angular position of the work can be oriented with respect to the initial angular position of the rotary support means 5.
  • the structure for carrying the grinding wheel 18 includes a hollow portion 12 of the base means 1, this portion 12 supporting a carriage means 13 which forms a lower carriage means capable of moving along a straight line back and forth toward and away from the column 50.
  • the lower part of the longitudinally rnovable carriage means 13 carries a dovetail projection 55 which cooperates with the bevelled surfaces of a pair of guideways 56 carried by the top surface of the portion 12 of the base means 1, so that in this way a dovetail guide is provided to cooperate with the dovetail projection 56 for guiding the carriage 13 back and forth toward and away from the column 50.
  • a dovetail guide is provided to cooperate with the dovetail projection 56 for guiding the carriage 13 back and forth toward and away from the column 50.
  • the lower carriage means 13 carries an upper carriage means 14 which is supported on the carriage means 13 for movement in a direction perpendicular to the direction of movement of the carriage 113, so that the upper carriage 14 in the illustrated example is a transversely movable carriage means, and it will be noted from FIG. 9 that the carriage 13 fixedly carries suitable transverse Ways on which the carriage 14 is guided for movement back and forth in a direction transverse to the direction of movement of the carriage means 13.
  • a split nut for example, threaded onto a rotary screw 66 which is free to turn with respect to the carriage 13 but which cannot move axially with respect thereto, and this rotary screw 66 has a free end which carries a hand-wheel 15 provided with suitable graduations, visible in FIGS. 2 and 3, these graduations cooperating with a stationary index so that by turning the hand-wheel 15 the screw 66 will turn in order to advance the carriage means 14 transversely with respect to the carriage means 13 to a selected location.
  • a removable supporting structure 16 is removably fixed to and extends upwardly from the carriage means 14, and this supporting structure 16 is rendered removable so that when necessary it can be replaced by a supporting structure 16 of a different size in order to enable particularly large workpieces to be ground with the machine of the invention.
  • the supporting structure 16 which actually forms part of the transversely movable carriage means 13, carries a plate 17 which carries suitable indicia and is provided with suitable openings to enable electrical connections to be made with switches and the like situated at the plate 17.
  • the upper removable portion 16 of the carriage 14 carries an angularly movable support means 20 which, :as illustrated in FIG. 9, is fixedly connected with one end of the elongated shaft 57 which is supported for rotary movement by the supporting structure 16 and which has a horizontal axis parallel to the direction of movement of the carriage means 13.
  • the carriage means 14 also supports for rotary movement at the supporting structure 16 thereof a rotary worm 58 having a handwheel 19 fixed thereto and provided with suitable graduations so that the angular position of the hand-wheel 19 and thus of the worm 58 will be indicated to the operator, and this worm 58 cooperates with a worm-wheel 59 which surrounds and is fixed to the rotary shaft 57, so that by turning the worm 58 through manual turning of the wheel 19 it is possible to determine the angular position of the angularly movable support means 20.
  • the support means 21 forms the head of the machine which carries the rotary grinding wheel 18 in a manner described in greater detail below, and in order to absolutely fix the angularly movable support means 20 in a selected angular position the free end of the shaft 57 distant from the support means 20 carries a plurality of braking discs '60 which through a handle 21 can be clamped so as to fix the shaft 57 and thus the support means 24 ⁇ at a selected position until the lever 21 is turned to release the brake means 60 whereupon the hand-wheel 19 can be turned to change the angular position of the support means 20.
  • the head 20 for the rotary wheel carrying means is also turnable about the axis of the shaft 57 which is situated within the supporting structure 16, but at one end the head 20 has a cover which supports the wheel-carrying means, indicated schematically by the reference character 27 in FIGS. 4 and 5, for vertical movement, while the motor 23 for driving the wheel 18 is in the embodiment of FIGS. l-3 connected to the opposite end of a housing, mounted on suitable shock-absorbing bearings, and through suitable belts and pulleys the motor 23 is capable of rotating the structure which carries the wheel 18 in the embodiment of FIGS. 1-3.
  • a further feature of the present invention includes a means which enables the operator to select either roughgrinding or finish-grinding operations.
  • the rotary or angularly movable support means 20 carries at its side. surface a turnable control member 22 which the operator can turn between a rough-grinding position and a finish-grinding position.
  • the operator In the roughgrinding position it is possible for the operator to control the pressure of the grinding wheel 18 and to displace the latter along its axis of rotation through several millimeters, while in the finish-grinding position the location of the grinding wheel 18 along its axis of rotation is fixed.
  • the motor 23 is also situated within a housing 27, but this motor 23 has its shaft directly connected to the wheel 18 so :as to directly carry the latter, and a portion of the housing 27 is in the form of a tubular extension which is coaxial with the motor 23 as well as with the rotary axis of the wheel 18 and which is guided for axial movement in a suitable tubular bearing portion of the angularly movable support means 20, as shown at the upper portion of FIG. 9.
  • the principle of operation of the grinding wheel with the embodiment of FIG. 9 is the same :as that of FIGS. 13, although the structure used for changing the elevation of the grinding wheel 18 is slightly different.
  • a manually operable lever means which includes a manually turnable lever 24 connected to the carriage means 13 by a connecting rod 62.
  • This connecting rod 62 is pivotally connected at one end to the carriage 13 and at 63 to the lever 24 which at its inner end not visible in FIG. 9 is pivotally connected to the base means 1, so that by turning the lever 24 about the vertical axis provided by its pivotal connection to the base means 1 the connecting rod 62 will transmit the turning movement of the lever 24 to the carriage 13 in order to displace the latter longitudinally.
  • the lever 24 is hollow and a cable 34 passes along the hollow interior of the lever 24.
  • One end of this cable is connected to a free end of a lever 25 which is pivotally connected intermediate its ends to the lever 24 and the configuration of the lever 25 is such that the operator can turn the lever 25 relative to the lever 24 so as to displace the cable 34.
  • This cable 34 passes from the interior of the carriage 13, through the open inner end of the hollow lever 24, out of the carriage 13 through a suitable sheath shown at the upper right portion of FIG.
  • this structure for controlling the grinding wheel 18 is synchronized with the angular range of movement I of the angularly movable support means 20, shown in FIG. 2, as well as with the longitudinal movement of the carriage 13 indicated at L in FIG. 3 and with the transverse movement T of the carriage 14, also indicated in FIG. 3, this transverse movement being of a range somewhat less than the longitudinal movement, and of course being provided by turning of the hand-wheel 15, so that it is possible to move the wheel 18 in order to take lateral cuts as well as longitudinal cuts.
  • FIGS. 4 and 5 The structure for providing the operator with a choice of rough-grinding or finish-grinding operations is schematically illustrated in greater detail in FIGS. 4 and 5 which correspond to the embodiment of FIGS. l3.
  • the angularly movable support means 20 carries the rotary wheel supporting structure 27 in a manner enabling the latter to shift axially as indicated by the dotted arrow EF at the lower left of FIG. 4.
  • This wheel-carrying means 27 is formed with teeth which mesh with a rotary pinion 28 fixed to one end of a leaf spring 22 which at its opposite end is fixed to the slotted member 30 which receives in its slot a pin 31 which is eccentrically fixed to a rotary member 32 provided at the exterior of the machine with the handle 33 corresponding to the member 22 described above.
  • the operator can turn the button 33 so as to displace the pin 31 in the direction of the arrow E shown at the upper right portion of FIG. 4, and the result will be that the wheel-carrying means 27 will be lowered in the direction of the arrow B shown at the lower left of FIG. 4, and it is to be noted that the cable 34 is connected to a lever which projects from the rotary member 28, so that with the housing 27 thus lowered there will be a pull on the cable 34 and the wheel 18 will have been displaced to its lowermost elevation and the weight of the wheel 18 and the structure which carries the same will at this time be transmitted through the spring 29 to the element 30 which with its right slot engaging, at the right end of the slot, the pin 31, will resiliently support the structure 27 and the grinding wheel 18 therewith.
  • the manually turnable member 33 is situated at the top of the angularly movable support means 20 and when the member33 is turned it actuates a cam having an inclined camming surface which enables the housing 27 to become lowered due to its own weight when the element 33 is turned, the weight of the housing 27 at this time being supported by a coil tension spring 29a which corresponds to the spring 29, spring 29a is fixed at opposite ends to the housing 27 and to the support means 20 and thus when the wheel 18 is manually lowered in this way it will simply be supported by the spring 29a.
  • a lever 64 which is pivoted at 65 has its free end extending beneath a shoulder of the structure which is operated by the annular cam which turns with the handle 33 so that by pulling on the cable 34 it is possible to turn the lever 64 in a clockwise direction, as viewed in FIG. 9, so as to raise the housing 27 and the wheel 18 therewith.
  • the cam which turns therewith raises the housing 27 to its uppermost position where the outer, right end of the lever 64, as viewed in FIG.
  • the wheel 18 will either have a fixed position for finished grinding or it can be displaced along the axis of rotation for rough-grinding operations, the control at this time being quite sensitive and being manually controlled by the operator through the cable 34 and the lever 25.
  • the button 33 In the finish-grinding position where the wheel 18 is fixed in its uppermost position, the button 33 is in the position F, the lever 25 is at rest, and the grinding surface of the wheel 18 is in a plane which includes the axis of the shaft 57.
  • the grinding wheel 18 now being placed above the workpiece, the operator can relax the pressure on the lever 25 so as to free the wheel 18 which can now press downwardly against the workpiece with the relatively light pressure which can easily be determined by the engagement of the lever 24 by the finger of the operator, and simultaneously the operator can turn the lever 24 back and forth so as to bring about the longitudinal displacement of the carriage 13 in both directions, and thus the grinding wheel 18 can be passed back and forth over the work engaging the latter with a pressure which is easily determined and maintained by the operatorv
  • the operator can then raise the grinding wheel by turning the lever 25, and if necessary the lever 24 can be turned so as to displace the grinding Wheel back away from the work so as to be able to pass the latter without engaging the same.
  • the roughgrinding operations can be carried out in this way, and when they are completed the button 33 is returned to the position F, thus immobilizing the grinding wheel at its normal elevation where its grinding surface is in a plane which includes the axis of the shaft 57, and the lever 25 will now have no influence on the operations.
  • these rough-grinding capabilities of the machine of the invention it is possible, for example, to remove metal having a thickness of 1 mm. from a workpiece with two passes of the grinding wheel over the work, whereas with a conventional machine 25 successive passes each removing 0.04 mm. would be required.
  • the grinding wheel 18 works to a far greater extent with its fiat grinding face 1 1 then with its edge, so that the flatness of the flat grinding face is preserved.
  • the workpiece to be ground is (FIG. 10) the cutting portion X of a tool Y adapted to be carried by the tool-carrier of a machine tool, for example.
  • the cutting portion has, in the illustrated example, a top end face b, and two side faces a and c, all of which must be ground to predetermined inclinations so as to provide proper cutting.
  • the workpiece is of course mounted on the work-holding means 10.
  • the machine of the invention is then operated to grind first side face a, then the top end face b, and finally the other side face of the workpiece.
  • the rockable support means 8 For cutting the side face a the rockable support means 8 is inclined to tilt the work at an angle of 6 with respect to the vertical (FIG. 12) to one side or the other of a vertical axis depending upon the direction in which the top face of the cutter is to be inclined. This position is maintained up until the end of the entire grinding of the entire workpiece.
  • the rotary support means 5 is then turned so as to situate the work (FIG. 11) at an angle of in front of the grinding wheel, and then the grinding wheel itself is inclined so as to take into account the 6 inclination of the workholding means, an angle of, for example, 1 inclination, as shown in FIG. 12.
  • FIG. 10 shows this setting in side view.
  • the grinding of the side face is carried out to provide the 7 inclination shown in FIG. 17b.
  • the rotary support means 5 is turned to displace the work at an angle of 7 in front of the grinding wheel (FIG. 14), and the stop 27 is placed in contact with the work.
  • the grinding wheel 18 is given an inclination of 5 to the vertical (FIG. 15) and the grinding of the end face b takes place as shown most clearly in FIG. 13. In this way the 5 angle of FIG. 17a is achieved.
  • the grinding wheel itself is turned to an inclination where its fiat grinding surface is at 90 with respect to a vertical axis (FIG. 16), and the final grinding of the side face 0 of the cutter takes place, providing the 7 angle of FIG. 17c. Now the grinding operations are completed, the work is removed and the machine can be returned to its rest position.
  • the grinding machine of the invention provides the following distinctions and advantages:
  • the machine of the invention is capable of grinding all cutting parts of the work, including the front and top faces thereof.
  • a single hollow cutting wheel of conical configuration is capable of carrying out all of the grinding operations without being removed from the machine, irrespective of whether the grinding operations involves a cutting stroke directed to the right or to the left.
  • the possibility of releasing the cutting wheel for downward movement so that it can be controlled by cable 34 enables the roughgrinding operations to be carried out very rapidly.
  • the stop 27 which is short and rigid and which can be situated on either side of the rockable support means 8 depending upon whether the grinding progresses toward the right or to the left results in a single adjustment of the work with respect to an axis perpendicular to the axis about which the rockable support means 8 can turn and permitting a choice in the point of contact with a cutting tooth of the work.
  • the position of the stop 27 is independent of the particular inclination of the side surface of the work, and this stop 27' can remain at all times perpendicular to a line joining the tooth which is to be ground and the center of the workpiece.
  • the angular positions of the rockable support means 8 with respect to the rotary support means 5 can be read on scales carried by the support means 5.
  • the radial positions of the work can be read on the support means 8.
  • the grinding wheel works in such a way that the principal force is axial or radial, as distinct from conventional dispositions which have a tendency to produce on the workpiece a rotary movement of the workpiece about its axis.
  • the axis of the work held by the work-holding means 10 is maintained within plus or minus 7 of a vertical axis, so as to enable the heaviest workpieces to be ground Without any sacrifice in precision and while at the same time guaranteeing to the operator a very clear view of the work throughout all the operations thereon.
  • base means for grinding workpieces such as cutters for machine tools
  • base means for supporting a workpiece for vertical movement, for rotary movement about a vertical axis, for horizontal movement about a horizontal axis, and for shifting movement along said horizontal axis
  • longitudinally movable carriage means carried by said base means for movement toward and away from said assembly of support means
  • transversely movable carriage means carried by said longitudinally movable carriage means for movement transversely with respect to the direction of movement of said longitudinally movable carriage means
  • angularly movable support means carried by said transversely movable carriage means for angular movement about a substantially horizontal axis which extends in the direction of movement of said longitudinally movable carriage means
  • a grinding wheel having a grinding face directed toward a workpiece carried by said assembly of support means, rotary wheel-carrier means carrying said grinding wheel in a position where said face is situated in a plane which includes the axis about which said
  • base means for grinding workpieces such as cutters for machine tools
  • base means for supporting a workpiece at a selected one of a plurality of difierent attitudes
  • lower carriage means carried by said base means adjacent to said assembly of said support means for movement back and forth along a first linear path
  • upper carriage means carried by said lower carriage means for movement with respect thereto back and forth along a second linear path which is perpendicular to said first path
  • angularly movable support means carried by said upper carriage means for angular movement about a horizontal axis extending in the same general direction as said first path
  • a motor housing carried by said angularly movable support means for movement along an axis perpendicular to the axis of which said angularly movable support means turns
  • wheel-carrying motor means situated in said housing for carrying a grinding wheel and rotating the latter about said axis along which said housing is movable; manually operable spring means operatively connected
  • hollow base means a vertical column supported by said base means for vertical movement and having a top end portion situated above said base means; rotary support means carried by said top end portion of said column for rotation about a substantially vertical axis; rockable support means carried by said rotary support means for rocking movement about a substantially horizontal axis; work-holding means carried by said rockable support means; a vertical screw supported by said base means for rotation but prevented from moving axially; a nut through which said screw is threaded, said nut being fixed to said column so that in response to rotation of said screw said column will be vertically displaced; a worm wheel fixed to said screw; a worm meshing with said work wheel; a hand wheel fixed to said worm for manually rotating the latter for raising and lowering said column; and operator actuated turning means operatively connected to said worm for turning the latter through a given angular increment at each actuation of said turning means, so that in response to successive
  • toot-pedal means operatively connected to said turning means for actuating the latter when said foot-pedal means is depressed, so that at each depression of said foot-pedal means said turning means is actuated to displace said column vertically by said predetermined increment.
  • base means for grinding workpieces such as cutters for machine tools
  • base means vertically movable support means carried by said base means for vertical movement and having a top end portion situated above said base means; rotary support means carried by said top end portion of said vertically movable support means for rotary movement about a substantially vertical axis; rockable support means carried by said rotary support means for rocking movement about a substantially horizontal axis; work-holding means carried by said rockable support means for movement therealong in a direction substantially parallel to said horizontal axis,
  • said work-holding means being adapted to position a workpiece at a location where it is clearly visible to the operator; moving means operatively connected to said vertically movable support means for displacing the latter vertically through a given increment at each actuation of said moving means; longitudinally movable carriage means carried by said base means for longitudinal movement back and forth along a predetermined linear path toward and away from said vertically movable support means; transversely movable carriage means carried by said longitudinally movable carriage means for transverse movement relative thereto along a second path perpendicular to said first path; angularly movable support means carried by said transversely movable carriage means for angular movement about a substantially horizontal axis extending in the same direction as that in which said longitudinally movable carriage means moves; rotary wheelcarrying means carried by said angularly movable support means and adapted to carry a rotary grinding wheel having a face directed to said workpiece while supporting the latter for rotation about an axis perpendicular to the axi
  • base means In a machine for grinding workpieces such as cutters which are used in machine tools, in combination, base means; vertically movable support means carried by said base means for vertical movement relative thereto and having a top end portion situated above said base means; rotary support means carried by said top end portion of said vertically movable suppont means for rotation about a vertical axis; work holding means carried by said rotary support means for holding work which is to be ground; lower carriage means carried by said base means for linear movement back and forth along a first predetermined path; upper carriage means carried by said lower carriage means for linear movement back and forth relative thereto along a second path which is perpendicular to said first path, one of said paths extending toward said vertically movable support means; angularly movable support means carried by said upper carriage means for angular movement about a substantially horizontal axis which extends in the direction of said one path; and rotary wheel carrier means carrying a grinding wheel having a face directed toward a workpiece carried by said work holding means, said rotary wheel carrier means
  • base means In a machine for grinding workpieces such as cutters which are used in machine tools, in combination, base means; vertically movable support means carried by said base means for vertical movement relative thereto and having a top end portion situated above said base means; rotary support means carried by said top end portion of said vertcially movable support means for rotation about a vertical axis; rockable support means carried by and extending upwardly from said rotary support means for rockable movement relative thereto about a substantially horizontal axis, so that said rotary and rockable support means move vertically with said vertical support means and said rockable support means turns with said rotary support means about said vertical axis while capable of turning about said horizontal axis relative thereto; work holding means carried by said rockable support means for holding work which is to be ground; lower carriage means carried by said base means for linear movement back and forth along a first predetermined path; upper carriage means carried by said lower carriage means for linear movement back and forth relative thereto along a second path which is perpendicular to said first path, one of said paths
  • base means for grinding workpieces such as cutters for machine tools
  • base means for supporting a Workpiece at a selected one of a plurality of different attitudes
  • lower carriage means carried by said base means adjacent to said assembly of said support means for movement back and forth along a first linear path
  • upper carriage means carried by said lower carriage means for movement with respect thereto back and forth along a second linear path which is perpendicular to said first path
  • angularly movable support means carried by said upper carriage means for angular movement about a horizontal axis extending in the same general direction as said first path
  • a motor housing carried by said angularly movable support means for movement along an axis perpendicular to the axis of which said angularly movable support means turns
  • wheel-carrying motor means situated in said housing for carrying a grinding wheel and rotating the latter about said axis along which said housing is movable; manually operable spring means operatively connected to said

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US397852A 1961-09-15 1964-09-21 Sharpening machine for tool-carrying heads Expired - Lifetime US3258880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR41859A FR1307358A (fr) 1961-09-15 1961-09-15 Affûteuse de tourteaux

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US3258880A true US3258880A (en) 1966-07-05

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902282A (en) * 1974-07-09 1975-09-02 Meason M M Inc Reed sanding machine
FR2307616A1 (fr) * 1975-04-14 1976-11-12 Pear Mecc Arrigo Pecchioli Affuteuse pour outils, apte a affuter des outils de profils varies
US4163345A (en) * 1976-06-17 1979-08-07 Ag Fur Automatisierung Arrangement for the grinding of rotary profile cutters
FR2495035A1 (fr) * 1980-12-03 1982-06-04 Avyac Affuteuse universelle ergonomique
USD983638S1 (en) * 2021-04-26 2023-04-18 Henry Vuu Nipper sharpener

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE251426C (fr) *
US1249971A (en) * 1917-03-19 1917-12-11 C N Puckett Starter for automobile-engines.
US1422682A (en) * 1920-09-30 1922-07-11 St Joseph Iron Works Mechanical movement
US1917504A (en) * 1931-09-05 1933-07-11 Kearney & Trecker Corp Cutter grinder
US1984528A (en) * 1932-09-02 1934-12-18 Oakes Prod Corp Apparatus for the surface finishing of metal
US2055361A (en) * 1934-02-15 1936-09-22 Edd C Oliver Grinding machine
US2118912A (en) * 1934-10-29 1938-05-31 Kearney & Trecker Corp Cutter grinder
DE686920C (de) * 1938-06-12 1940-01-18 Sitel Soc Ind Et Tech Pour L E besondere Fahrschalter mit einer Totmanneinrichtung
US2401874A (en) * 1944-04-18 1946-06-11 Herbert F Kilbride Grinding machine
US2489335A (en) * 1947-06-04 1949-11-29 Floyd H Shadle Precision sickle sharpener
US2548277A (en) * 1948-06-09 1951-04-10 Gen Motors Corp Cutter grinding machine

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE251426C (fr) *
US1249971A (en) * 1917-03-19 1917-12-11 C N Puckett Starter for automobile-engines.
US1422682A (en) * 1920-09-30 1922-07-11 St Joseph Iron Works Mechanical movement
US1917504A (en) * 1931-09-05 1933-07-11 Kearney & Trecker Corp Cutter grinder
US1984528A (en) * 1932-09-02 1934-12-18 Oakes Prod Corp Apparatus for the surface finishing of metal
US2055361A (en) * 1934-02-15 1936-09-22 Edd C Oliver Grinding machine
US2118912A (en) * 1934-10-29 1938-05-31 Kearney & Trecker Corp Cutter grinder
DE686920C (de) * 1938-06-12 1940-01-18 Sitel Soc Ind Et Tech Pour L E besondere Fahrschalter mit einer Totmanneinrichtung
US2401874A (en) * 1944-04-18 1946-06-11 Herbert F Kilbride Grinding machine
US2489335A (en) * 1947-06-04 1949-11-29 Floyd H Shadle Precision sickle sharpener
US2548277A (en) * 1948-06-09 1951-04-10 Gen Motors Corp Cutter grinding machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902282A (en) * 1974-07-09 1975-09-02 Meason M M Inc Reed sanding machine
FR2307616A1 (fr) * 1975-04-14 1976-11-12 Pear Mecc Arrigo Pecchioli Affuteuse pour outils, apte a affuter des outils de profils varies
US4163345A (en) * 1976-06-17 1979-08-07 Ag Fur Automatisierung Arrangement for the grinding of rotary profile cutters
FR2495035A1 (fr) * 1980-12-03 1982-06-04 Avyac Affuteuse universelle ergonomique
EP0053569A1 (fr) * 1980-12-03 1982-06-09 AVYAC Société Anonyme Affûteuse universelle ergonomique
USD983638S1 (en) * 2021-04-26 2023-04-18 Henry Vuu Nipper sharpener

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Publication number Publication date
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