US3703056A - Knife grinding device for a motor-driven cutting tool - Google Patents

Knife grinding device for a motor-driven cutting tool Download PDF

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Publication number
US3703056A
US3703056A US143010A US3703056DA US3703056A US 3703056 A US3703056 A US 3703056A US 143010 A US143010 A US 143010A US 3703056D A US3703056D A US 3703056DA US 3703056 A US3703056 A US 3703056A
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US
United States
Prior art keywords
control rod
grinder head
grinding
knife
swinger
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US143010A
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English (en)
Inventor
Boris Langhoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Krauss und Reichert GmbH and Co KG
Original Assignee
Krauss und Reichert GmbH and Co KG
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Filing date
Publication date
Application filed by Krauss und Reichert GmbH and Co KG filed Critical Krauss und Reichert GmbH and Co KG
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Publication of US3703056A publication Critical patent/US3703056A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/3806—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface
    • B26F1/3813—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface wherein the tool head is moved in a plane parallel to the work in a coordinate system fixed with respect to the work
    • B26F1/382—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface wherein the tool head is moved in a plane parallel to the work in a coordinate system fixed with respect to the work wherein the cutting member reciprocates in, or substantially in, a direction parallel to the cutting edge

Definitions

  • Mechanical means are provided which, as the inder head moves in the one or the other direction, displace the one or the other grinding element and cause them to engage and thus grind alternately the two knife blade faces.
  • the period of applying the force to said grinding elements during the reciprocation of the grinder head is changeable for grinding only selected ranges of the knife blade faces.
  • This invention relates to a motor-driven cutting tool having a vertically reciprocating knife advanced through the material in the cutting direction and a grinder head secured to a vertically reciprocated lifting rod.
  • the grinder head comprises. at either side of the knife, two laterally arranged swinger arms which may be pivoted into operational positions from a position of rest into which they are urged by spring means.
  • Each swinger arm carries a driven grinding member selectively placeable into engagement with one or the other knife blade face by means of a setting member provided on the grinder head.
  • the invention is based on the recognition that, for the purpose of improving the grinding operation, it would be desirable to move the swinger arm with the grinding element from its operative (grinding) position in the range of the lower dead center in such a manner that it omits the lower stroke reversal range from the grinding operation proper. It is noted that because of the stroke reversal, there is a lower stroke speed before and after the stroke reversal, so that in this range the grinding effect is decreased.
  • the setting member for pivoting the swinger arms is formed as a control rod moved by the vertically reciprocating grinder head through an adjustable linkage.
  • the control rod is guided through an adjustable brake provided on the cutting tool.
  • the setting motion of the control rod effected by its delayed motion with respect to the grinder head is transmitted through said linkage to the swinger arms in such a manner that, dependent upon the direction of stroke of the grinder head, one or the other swinger arm is in an operative position with its grinding member with respect to one knife blade face.
  • the control rod has portions which are unaffected by the brake and which thus provide that only certain predetermined portions of the knife blade edges are submitted to the grinding operation.
  • FIG. I is a side elevational view of one embodiment of the invention.
  • FIG. 2 is a sectional view along line 22 of FIG. 1 (some components are omitted for the sake of clarity);
  • FIG. 3 is a sectional view along line 3-3 of FIG. 2;
  • FIG. 4 is a fragmentary front elevational view taken in the direction of arrow A shown in FIG. 3;
  • FIG. 5 is an enlarged front elevational view, partially in section, of a variant of some components of the same embodiment
  • FIG. 6 is a view of a variant of a component taken similarly to FIG. 2;
  • FIG. 7 is a sectional view taken along line 77 of FIG. 6;
  • FIG. 8 is a front elevational view of one component of the device taken in the direction of the arrow B shown in FIG. 7.
  • the cutting tool shown therein may be guided manually on a table II which supports a material 12 to be cut.
  • the cutting tool is provided with a foot plate 14 carrying table-engaging rollers l3 and moving under the material 12.
  • the foot plate 14 is attached to the underside of the housing 16 of the cutting tool by means of a leg 15.
  • an electric motor 17 which, in a known and therefore not illustrated manner, causes a knife 18 to reciprocate vertically.
  • the knife 18 is, at its end remote from the knife blade faces 19 (FIG. 2) guided in a knife sheath 20 which, in turn, is held in a suitable opening provided lengthwise in the leg 15.
  • a handle 21 serves for guiding the cutting tool during operation, while a carrier handle 22 may be used for transporting the same.
  • a switch 23 mounted on the housing 16.
  • a pressure rod 24 to the lower terminus of which there is secured a material pressing plate 25 which holds the material immediately adjacent the knife 18 during the cutting operation.
  • a drive shaft 26 rotated by the motor 17.
  • the same housing portion also holds a lifting rod 27 which, in a known manner, is vertically reciprocated by the electric motor 17.
  • a grinder head 29 which, when the lifting rod is operating, is vertically reciproeated by the latter.
  • the grinder head 29 contains a guiding sleeve 30 which surrounds and slides on the pressure rod 24.
  • the drive shaft 26, which is extensible to follow the displacements of the lifting rod 27, transmits its rotary motion to a pinion 33 through a rotary pin 32 keyed to the shaft 26 by means of a transverse pin 31.
  • the pinion 33 meshes with an intermediate pinion 34 which, in turn, meshes with two adjacent spur gears 35 and 36.
  • the intermediate pinion 34 is held on the guide sleeve by means of a collar 37, while the two spur gears and 36 are keyed to respective shafts 38 and 39 supported in the grinder head 29.
  • the shafts 38 and 39 project downwardly beyond the grinder head 29 and carry at their free ends pulleys 40 and 41, respectively.
  • abrasive grinding belts 42 and 43 are trained endless abrasive grinding belts 42 and 43, respectively, which, at the end of arms 44 and 45, are trained about respective tensioning idler pulleys 46 and 47.
  • the latter are held in respective bearing brackets 48 and 49 having pins 52 and 53 slidably held in the terminus of arms 44, 4S.
  • Springs 50, 51 urge the bearing brackets 48 and 49 with their respective pulleys 46, 47 away from arriis 44, and thus, the abrasive belts 42, 43 are resiliently ten sioncd.
  • the bearing brackets 48, 49 are prevented from rotating by pins 54, 55 also slidably received in arms 44, 45. This tensioning feature is best illustrated in FIGS. 2 and 3.
  • a lever 56 which has a forked end to which there are attached guide shoes 57 and 58.
  • the latter in their central position shown in FIG. 2, engage the inner side of one flight of abrasive belts 42 and 43.
  • the fork tines with the guide shoes 57 and 58 have the function of the swinger arms referred to in the introductory part of the specification.
  • a bar 62 which is oriented opposite the cutting direction of the device and which, in its terminal range, is traversed by a control rod 63.
  • the control rod 63 is secured to the bar 62 by a setting screw 64.
  • the latter may be provided with a series of spaced depressions 65 as well shown in FIG. 4.
  • the control rod 63 also passes through a brake 67 biased by a spring 66.
  • the brake 67 is disposed in a cavity 68 of the housing 16 and has a cup-shaped portion 69 into which there extends a slidable pin 70 surrounded by the spring 66.
  • the pin 70 is provided with a throughgoing opening 72, while the cup-shaped portion 69 has aligned, diametrically opposed openings 71.
  • the spring 66 urges the cup-shaped portion 69 into a position in which the opening 71 on the one hand and the opening 72 on the other hand are out of alignment.
  • the control rod 63 passing through the openings 71 and 72, is hindered in its motion by virtue of the aforenoted misalignment and the resulting friction caused by spring 66.
  • This frictional effect may be increased or decreased by varying the tension of the spring 66 by turning a knurled knob 73.
  • the openings 71, 72 define a cross section which is larger than the full cross section of the control rod 63 in the range of the brake 67, so that the latter has no effect on the control rod 63.
  • the lever 56 is, with the swinger arms carrying the guide shoes 57 and 58, in its middle position as shown in FIG. 2, whereas the grinder head 29 is in its upper dead center.
  • the bell crank 61 moves the control rod 63 downwardly only to a short distance without moving it out of its mid position as shown.
  • the flattened portion of the control rod 63 which, at the beginning of this motion, is disposed within the brake, may move downwardly without being frictionally engaged.
  • the latter frictionally engages the control rod 63 and first prevents further motion thereof.
  • the latter lags behind the further downwardly moving grinder head 29 and the bell crank 61 is swung counterclockwise when viewed in FIG. 4.
  • FIGS. 6-8 there is shown a second embodiment of the invention, wherein the grinding elements are formed as rotary grinding discs 98 and 99.
  • the grinder head 79 is provided with a clamping means 80 which is identical in structure and function to the clamping device 28 of the previously described embodiment.
  • the bore 81 receiving the lifting rod 27 is disposed with respect to the pressure rod 24 as in the first embodiment.
  • the bell crank 61 is also designed in the same manner, so that the opening 82 provided therein for receiving the control rod 63 has the same relation to the other parts of the grinder head as in the previously described embodiment.
  • the two embodiments differ from one another in that the springsecured mid position of the bell crank 61 is effected not by the belt tensioning springs 52 and 53 of the grinding belts 43 and 44, but by means of a spring wire rod 83 which is disposed in the grinder head 79, and which extends through a bore 84 provided in an extension 85 of the bell crank 61.
  • the rotary pin 32 which is secured to the drive shaft 26 by the transversal pin 31, is in this embodiment held in a sleeve 83a positioned in the grinder head 79 and carries, at its end projecting from the grinder head, a drive pulley 86 keyed thereto.
  • a further pulley 87 is freely rotatably supported on the sleeve 83a.
  • An endless cord 88 is trained about the drive pulley 86, a driven pulley 89, then about the idling pulley 87, and a further driven pulley 90.
  • the driven pulleys 89 and 90 are keyed to their respective shafts 93 and 94 held in respective swinger arms 91 and 92 pivotable about respective pins 95, 96 secured to the grinder head 79. That end of each sw inger arm 91, 92 which is remote from the grinding elements, is pivotally attached to a guiding bar 97. To the center of the latter there is affixed a pin 970 which similarly to the pin 59 of the preceding embodiment passes through a slot 60 provided in the bell crank 61.
  • the grinding elements in this embodiment as indicated hereinabove are formed ofdish-like abrasive members 98 and 99.
  • the adjusting screw 78 is inserted into the opening 82 of the pin 62 in an opposite direction as compared to the adjusting screw 64 of the previously described embodiment.
  • the grinder head 79 attached to the lifting rod 27 cooperates with the control rod 63 brakably guided in the opening 82 in a manner identical to that in the previously described embodiment.
  • grinder heads 29 and 79 have identically arranged openings and connecting elements for the lifting rod 27, the drive shaft 26 and control rod 63.
  • FIG. 5 there is illustrated a stepless adjusting means for further increasing the possibilities of varying the location of connection between the bell crank 61 and the control rod 63.
  • the lower end of the control rod 63 carries, between a collar 74 and a nut 75, a sleeve 76 which is secured against axial motion and which is provided at its outer lateral face with a helical groove 77.
  • a sleeve 76 which is secured against axial motion and which is provided at its outer lateral face with a helical groove 77.
  • the pin of an adjusting screw 78 After loosening the screw 78, the height position of the control rod 63 with respect to the parts moving thereon may be changed in a stepless manner by rotating the sleeve 76. The latter may be immobilized in the selected position by tightening the screw 78.
  • a knife grinding device associated with a cutting tool having a knife including two blade faces, said device being of the type having (a) a grinder head reciprocably mounted on said tool, (b) means for causing a reciprocating motion of said grinder head, (c) grinding elements supported by said grinder head and disposed at either side of said knife, (d) swinger arms supported by said grinder head and associated with each grinding element to alternately urge the latter into grinding engagement with one and the other knife blade face during reciprocation of said grinder head, and (e) spring means urging said swinger arms in a mid position in which each grinding element is in a spaced,
  • control rod means affixed to said grinder head to reciprocate therewith; said control rod means having determined brakable and non-brakable portions,

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Treatment Of Fiber Materials (AREA)
US143010A 1970-05-27 1971-05-13 Knife grinding device for a motor-driven cutting tool Expired - Lifetime US3703056A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702025854 DE2025854A1 (en)) 1970-05-27 1970-05-27

Publications (1)

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US3703056A true US3703056A (en) 1972-11-21

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US143010A Expired - Lifetime US3703056A (en) 1970-05-27 1971-05-13 Knife grinding device for a motor-driven cutting tool

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US (1) US3703056A (en))
DE (1) DE2025854A1 (en))
FR (1) FR2093750A5 (en))
GB (1) GB1295020A (en))
HU (1) HU162816B (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294047A (en) * 1980-01-14 1981-10-13 Gerber Garment Technology, Inc. Method of sharpening lateral edges and end edges of a blade during reciprocation thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1928462A (en) * 1931-10-12 1933-09-26 Price Meyer Knife sharpening device
US3548495A (en) * 1968-07-31 1970-12-22 Cincinnati Milacron Inc Material cutting machine having sharpening bands for sharpening reciprocating cutting blade
US3562801A (en) * 1968-09-11 1971-02-09 Wolf Machine Co The Belt-type blade sharpener apparatus for a cloth cutting machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1928462A (en) * 1931-10-12 1933-09-26 Price Meyer Knife sharpening device
US3548495A (en) * 1968-07-31 1970-12-22 Cincinnati Milacron Inc Material cutting machine having sharpening bands for sharpening reciprocating cutting blade
US3562801A (en) * 1968-09-11 1971-02-09 Wolf Machine Co The Belt-type blade sharpener apparatus for a cloth cutting machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294047A (en) * 1980-01-14 1981-10-13 Gerber Garment Technology, Inc. Method of sharpening lateral edges and end edges of a blade during reciprocation thereof

Also Published As

Publication number Publication date
HU162816B (en)) 1973-04-28
FR2093750A5 (en)) 1972-01-28
DE2025854A1 (en)) 1972-03-16
GB1295020A (en)) 1972-11-01

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