US3435640A - Knife rest for a band shaped splitting knife - Google Patents

Knife rest for a band shaped splitting knife Download PDF

Info

Publication number
US3435640A
US3435640A US684864A US3435640DA US3435640A US 3435640 A US3435640 A US 3435640A US 684864 A US684864 A US 684864A US 3435640D A US3435640D A US 3435640DA US 3435640 A US3435640 A US 3435640A
Authority
US
United States
Prior art keywords
knife
rest
splitting
band shaped
machine
Prior art date
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
US684864A
Other languages
English (en)
Inventor
Frantisek Flekac
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.)
Strojosvit np
Original Assignee
Strojosvit np
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Strojosvit np filed Critical Strojosvit np
Application granted granted Critical
Publication of US3435640A publication Critical patent/US3435640A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/02—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather
    • C14B1/14—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather using tools cutting the skin in a plane substantially parallel to its surface
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B2700/00—Mechanical treatment or processing of skins, hides or leather in general; Pelt-shearing machines; Making driving belts; Machines for splitting intestines
    • C14B2700/10—Processes and machines for splitting leather and devices for measuring and printing on hides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6572—With additional mans to engage work and orient it relative to tool station
    • Y10T83/6576—By opposed lateral guide means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/707—By endless band or chain knife
    • Y10T83/7264—With special blade guide means

Definitions

  • a knife rest for a band shaped splitting knife of a splitting machine for leather, hides and similar fiat material said knife rest automatically adjustable to different conditions of the splitting knife in operation, securing thus a contact between the rear surface of the knife and the active contact surface of the knife rest along a large contact area said rest having a curved face contacting its backing member to facilitate rotation of the rest against its backing member.
  • splitting knives for leather and hides are very important in the leather industry as the economy of manufacturing depends mostly on a proper splitting operation.
  • the most important element for the operation of a leather splitting machine is the splitting knife, its correct guiding and grinding.
  • splitting knives from relatively thin steel, connected to an endless band, are generally used for this purpose.
  • the knife is guided between lateral gibs and is supported by differently arranged rests, against which the knife leans with the width of its rear surface.
  • rests against which the knife leans with the width of its rear surface.
  • a point contact between knife and rest is furthermore caused due to a certain clearance of the guiding, whereby the rest is moved due to friction in the course of operation of the machine.
  • the bending of the knife is equally changing, it is different for a new knife and for a used knife and is also different if some different technology has been used for manufacturing the knife.
  • the sense of motion of the knife is frequently reversed so that even if for one sense some contact area is created, a point contact is again established for the reverse sense.
  • the point contact between knife and rest which particularly occurs on the rests on both extremities at a high pressure and speed, substantially affects the life time of the knife. Due to a concentrated pressure on the rear surface of the knife a high local stress of the material of the knife is created, resulting in cracks, which lead to a rupture of the knife, and which practically occur only on the rear part of the knife.
  • FIG. 1 is an elevation of the whole arrangement
  • FIG. 2 a detail of the knife rest
  • FIG. 3 a partial sectional view of a part of the splitting machine with the knife.
  • the knife 1 of the splitting machine rests with its rear part against the active supporting surface 2 of an element 3 capable to be deviated. Hard metal may be advantageously used on the active supporting surface 2.
  • the element 3 capable to be moved is supported by its rear circular part 7 by an adjustable supporting part 4 of the rest, guided laterally between gibs 5.
  • the adjustment of the adjustable part 4 of the rest in this case accomplished by means of screw bolts 6.
  • Gibs 11 and 12 guide the knife 1 in the direction, in which pressure is transmitted to the knife 1. In the case given they simultaneously enable by their shape the lateral guiding of the element 3 capable to be moved.
  • the lower gib 11 is fixed on the rear support 13 of the splitting machine.
  • the leather is supplied by feeding rollers 14 and 15 towards the knife 1 and splitting is accomplished due to the action of the sharp cutting edge at place 16.
  • a driving roller 8 transmits motion to the knife 1 which is tensioned by the tensioning roller 9.
  • the center S of curvature of the circular part 7 is situated in front of the active supporting surface 2 in order to achieve in the course of operation of the machine, where the knife moves in its longitudinal direction, a cooperation of the forces of friction to adjust automatically the element 3 capable to be deviated into its most advantageous position, so that the force acting on the rear surface of the knife is uniformly distributed along the whole active supporting surface 2.
  • Pressure of the knife 1 against the element 3 capable to be moved is generated not only due to pressure of the split material 10 which is fed towards the knife 1, but also in the course of idle running due to a relative inclination of the rollers 8 and 9 as already mentioned, as otherwise the knife 1 could leave the rollers 8 and 9.
  • the element 3 capable to be moved adjusts itself automatically so that the rear surface of the knife is in the course of operation subject to a minimum stress and the active supporting surface 2 of the element 3 capable to be deviated is stressed uniformly so that wear of both elements is reduced to a minimum and requirements for adjustment are equally substantially reduced.
  • Knife backing rest for a knife of a splitting machine for leather, hides and similar fiat material said knife in the shape of an endless bend With a cutting edge and 15 rection towards and away from said band knife; means for adjusting the position of said supporting part; said supporting part provided with a circular supporting surface for said element capable to be moved; the curvatures of both said circular parts being equal and having a common center of curvature situated in front of the active contact surface between the band shaped knife and said element capable to be moved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
US684864A 1966-11-21 1967-11-21 Knife rest for a band shaped splitting knife Expired - Lifetime US3435640A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS738066 1966-11-21

Publications (1)

Publication Number Publication Date
US3435640A true US3435640A (en) 1969-04-01

Family

ID=5422820

Family Applications (1)

Application Number Title Priority Date Filing Date
US684864A Expired - Lifetime US3435640A (en) 1966-11-21 1967-11-21 Knife rest for a band shaped splitting knife

Country Status (2)

Country Link
US (1) US3435640A (enrdf_load_stackoverflow)
NL (1) NL6715779A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919904A (en) * 1972-04-05 1975-11-18 Goodrich Co B F Tire truing machine
US4290330A (en) * 1979-02-06 1981-09-22 Amada Company, Ltd. Bandsaw blade guiding apparatus
US5660095A (en) * 1992-05-05 1997-08-26 Marquip, Inc. Apparatus for slitting corrugated paperboard boxes
US11351693B1 (en) * 2020-09-03 2022-06-07 Richard Karas Slicer blade guide with wear insert

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US617666A (en) * 1899-01-10 Marcus m
US909157A (en) * 1908-06-17 1909-01-12 Amory A Chilson Leather-splitting machine.
GB166699A (en) * 1920-04-20 1921-07-20 Masch Werke Zu Frankfurt Improvements in band-knife machines for splitting and skiving leather, paper-board and the like articles
US2524013A (en) * 1947-07-19 1950-09-26 Randall Company Leather skiving machine or splitter
US2804141A (en) * 1948-10-01 1957-08-27 Fortuna Werke Spezialmaschinen Band cutter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US617666A (en) * 1899-01-10 Marcus m
US909157A (en) * 1908-06-17 1909-01-12 Amory A Chilson Leather-splitting machine.
GB166699A (en) * 1920-04-20 1921-07-20 Masch Werke Zu Frankfurt Improvements in band-knife machines for splitting and skiving leather, paper-board and the like articles
US2524013A (en) * 1947-07-19 1950-09-26 Randall Company Leather skiving machine or splitter
US2804141A (en) * 1948-10-01 1957-08-27 Fortuna Werke Spezialmaschinen Band cutter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919904A (en) * 1972-04-05 1975-11-18 Goodrich Co B F Tire truing machine
US4290330A (en) * 1979-02-06 1981-09-22 Amada Company, Ltd. Bandsaw blade guiding apparatus
US5660095A (en) * 1992-05-05 1997-08-26 Marquip, Inc. Apparatus for slitting corrugated paperboard boxes
US11351693B1 (en) * 2020-09-03 2022-06-07 Richard Karas Slicer blade guide with wear insert

Also Published As

Publication number Publication date
NL6715779A (enrdf_load_stackoverflow) 1968-05-22

Similar Documents

Publication Publication Date Title
US3534647A (en) Apparatus for minimizing vibration in band sawing machines
US3435640A (en) Knife rest for a band shaped splitting knife
US5184487A (en) Machine for softening and stretching laminar products, particularly tanned hides
US2400527A (en) Slitting machine
KR200482915Y1 (ko) 물티슈 제조용 원단 절단장치
US3780605A (en) Guiding device, especially for splitting and beveling machines
US1895852A (en) Slitting device
US4444028A (en) Machine for splitting skins
US3352186A (en) Blade guiding and supporting structure for band saws
GB2063910A (en) Processing skins and hides
US2074556A (en) Drawing mechanism of spinning machines
US2316582A (en) Grinding and polishing machine
US2840860A (en) Drafting slivers of fibrous materials
US3831830A (en) Thread feeding device for textile machines
US1571972A (en) Tensioning device for endless-belt
US2953822A (en) Double apron drafting arrangement
US3736776A (en) Skin splitting machine
US2947039A (en) Roller mounting for spinning machines
US2532398A (en) Leather splitting machine
US1993064A (en) Machine for grinding shuttle points
JPH09295049A (ja) 矯正機のガイドローラ
US2607083A (en) Textile fiber drafting frame
US2790235A (en) Knife sharpening mechanism
US2804141A (en) Band cutter
US2370598A (en) Textile drawing mechanism