Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
  • B27G13/00—Cutter blocks; Other rotary cutting tools
  • B27G13/02—Cutter blocks; Other rotary cutting tools in the shape of long arbors, i.e. cylinder cutting blocks
  • B27G13/04—Securing the cutters by mechanical clamping means

Definitions

• the invention relates to a hand planer according to the preamble of claim 1.
• a hand planing machine is known from EP 0 048 303, the planing knives of which are fixed on the knife shaft with clamping jaws.
• the planing knives are mounted in a precise position with great effort, but after the user has dismantled the planing knives, the original positional accuracy cannot be achieved again or can only be achieved with great effort.
• Blunt planing knives are therefore reground without disassembly. They may only be re-sharpened with a minimal grinding abrasion, because if the grinding abrasion is high, the knife edge is displaced radially too far inwards relative to the knife shaft and chip removal is no longer possible.
• the clamping jaws are subject to a gradual deformation, their clamping force with respect to the planing knife diminishing and, moreover, the pretension between the clamping screw and the clamping jaw being lost by setting or by yielding the supporting surface of the clamping jaw, because none of the clamping jaws Parts springs.
• the hand planer according to the invention with the characterizing features of claim 1 has the advantage that the planing knives and the clamping jaws can always be reproducibly adjusted to the original position by a cost-effective solution and that there are therefore no vibrations during operation of the hand planer.
• the quality of work that can be achieved with the hand planer is consistently high over its entire service life.
• the planer shaft bearings are less loaded and therefore have a longer service life than with previously known planes.
• FIG. 1 shows a side view of a hand plane
• FIG. 2 shows the cross section of a knife shaft of this hand plane
• FIG. 3 shows a top view of the knife shaft
• FIG. 4 shows a spatial representation of a clamping jaw of the planing shaft
• FIG. 5 shows a top view of the clamping jaw
• FIG. 6 shows a clamping screw
• FIG. 7 shows an enlargement of the contour of the screw shaft of the clamping screw according to FIG. 5
• FIG. 8 shows a lateral sectional illustration of the clamping jaw
• FIG. 9 shows an enlargement of the screw hole profile according to FIG. 8.
• a hand-held planer 10 shown in FIG. 1 consists of a machine housing 12 with a motor housing 14 and a handle 16. An electric switch 18 is arranged in the handle 16.
• a knife shaft 20 is rotatably mounted in the machine housing 12 about its axis 19, the cutting edges 22 of which, when the knife shaft 20 rotates, determine a flight circle 24 shown in dash-dot lines, which protrudes beyond the base surface of the hand-held machine 10 designed as a sole 26, so that the Cutting 22 can engage in a workpiece that is flush with the sole 26.
• An opening 28 arranged in the sole 26 for the passage of the cutting edges 22 can be closed by a pendulum protective hood 30. This closes automatically as soon as the hand planer 10 is lifted off a workpiece. This reduces the risk of injury to the operator on the rotating blades 22.
• FIG. 2 A cross section of the knife shaft 20 is shown in FIG. 2, a base body 32 being recognizable, which, in mirror image, has a flattening 34 with a planer knife 36 on opposite sides, only one side of which is fully identified.
• an adjusting body 38 On the side of the planer knife 36 facing away from the flattening 34, an adjusting body 38 is fastened by means of adjusting screws 40.
• the adjusting screws 40 engage in a threaded bore 42 in the planer knife 36.
• the adjusting body 38 consists of an L-shaped bent sheet metal profile strip running along the planing knife 36.
• a flap 38 'of the adjusting element 38 formed by a short leg and bent at a right angle, engages in a adjusting groove 44 in the flattening 34 of the basic element 32 and thus fixes the cutting edge 22 of the planer knife 36 or the flight circle 24 with respect to the basic element 32 .
• a washer 46 is arranged between the head of the adjusting screw 40 and the adjusting body 38 as a screw lock.
• a clamping jaw 48 is screwed radially to the base body 32 by means of a clamping screw 50.
• the clamping screw 50 passes through a screw hole 52 of the clamping jaw 48 with a tapered screw shaft 54.
• the threaded region of the screw shaft 54 engages in a threaded bore 56 of the base body 32 and holds the clamping jaw 48 securely against loss.
• the planing knife 36 is clamped against the base body 32 in a position-securing manner via the clamping jaw 48.
• Three cup-like depressions 58, 58 ', 58 are embossed in the clamping jaw 48, the base surfaces 60, 60', 60" of which are each one Wear screw hole 52, 52 ', 52 "and lay on planer knife 36 from above.
• FIG. 3 The top view shown in FIG. 3 on the clamping jaw 48 according to FIG. 2 leaves part of the base body 32, the depressions 58, 58 ', 58 ", the base surfaces 60, 60', 60" and the clamping screw 50 the knife edge 22 of the planer knife 36 recognize.
• the contour of the adjusting body 38 and the adjusting screws 40 are shown in dash-dotted lines.
• the arrows x - x show the section of the illustration in FIG. 2.
• the clamping jaw 48 shown as a detail in FIGS. 4, 5 clearly shows the cup-like depressions 58, 58 ', 58 "and the square screw holes 52, 52', 52" in the base surfaces 60, 60 ', 60 ".
• a clamping screw 50 is shown as a detail in FIG. 6, the conical shaft 54 of which can be seen immediately adjacent to the screw head 64.
• the diameter of the tapered screw shaft 54 is slightly larger than the edge dimension of the square screw hole 52 or that of the inner circle.
• a press fit or a play-free fit with point contact is created between the screw shaft 54 and the screw hole 52.
• the angular screw hole 52 is slightly radially elastically deformed. This enables the clamping jaw 48 to be positioned in a particularly reliable and precisely repeatable manner after a knife change.
• 3, 4, 5 is square and fixes the clamping jaw 48 axially and tangentially with respect to the basic body 32 by its edge dimension along and across the axis 19 of the plane shaft 20 being approximately 0.
• the second squared screw hole 52 with the assembly sequence number 2 in the viewing direction on the right outside is square, measured parallel to the axis 19, 0.2 mm larger than the diameter of the screw shaft 62 and secures the clamping jaw 48 only in the circumferential direction and radially with respect to the plane shaft 20.
• the middle screw hole 52 'with the assembly sequence number 3 has the same dimensions as the second screw hole 52, so that the effect is also identical.
• FIG. 8 shows a clamping jaw 48, the base surfaces 60, 60 ', 60 "of the recesses 58, 58', 58" are slightly arched upwards by embossing, so that they act as an integrated plate spring, which secure the screw preload after the final assembly.
• the area of the cup spring-like curvature is case-hardened by carbonitriding, with the result of a greater possible spring travel and better sliding ability compared to the adjusting screw 40.
• the remaining screw holes are only designed as a tightly fitted elongated hole. stalten or have play all around, so that the screw only clamps the jaw radially in the area of the screw hole.
• assembly sequence numbers 1 to 3 indicate the appropriate sequence for screwing.
• At least the two outer screw holes of the clamping jaws are designed as polygonal, in particular rectangular, elongated holes, the longitudinal axes of which are arranged at right angles to one another.
• Essential for the functioning of the present invention is the point contact between the screw shaft and the edge of the screw hole, which can be realized practically only via a polygonal, in particular a square hole or a multiply interrupted circular recess.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Milling, Drilling, And Turning Of Wood (AREA)
• Sawing (AREA)
• Dry Shavers And Clippers (AREA)
• Polarising Elements (AREA)
• Liquid Crystal (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8002672

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (3)

Citations (4)

• 1995
  • 1995-01-19 DE DE29500774U patent/DE29500774U1/de not_active Expired - Lifetime
  • 1995-12-06 JP JP52195396A patent/JP3958788B2/ja not_active Expired - Lifetime
  • 1995-12-06 CN CN95197377A patent/CN1068821C/zh not_active Expired - Lifetime
  • 1995-12-06 DE DE59505396T patent/DE59505396D1/de not_active Expired - Lifetime
  • 1995-12-06 WO PCT/DE1995/001729 patent/WO1996022174A1/de active IP Right Grant
  • 1995-12-06 EP EP95940134A patent/EP0804320B1/de not_active Expired - Lifetime

Patent Citations (4)

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