US3575074A - Apparatus to control the feeding amount in bandsawing machines - Google Patents

Apparatus to control the feeding amount in bandsawing machines Download PDF

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Publication number
US3575074A
US3575074A US710839A US3575074DA US3575074A US 3575074 A US3575074 A US 3575074A US 710839 A US710839 A US 710839A US 3575074D A US3575074D A US 3575074DA US 3575074 A US3575074 A US 3575074A
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United States
Prior art keywords
cylinder
hydraulic
passage
valve means
outlet
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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
US710839A
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English (en)
Inventor
Tsuneo Aizawa
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Amada Co Ltd
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Amada Co Ltd
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Publication date
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Publication of US3575074A publication Critical patent/US3575074A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
    • B23D55/08—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts of devices for guiding or feeding strap saw blades
    • B23D55/088—Devices for feeding strap saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D53/00—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting
    • B23D53/04—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting with the wheels carrying the strap mounted shiftably or swingingly, i.e. during sawing, other than merely for adjustment
    • B23D53/045—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting with the wheels carrying the strap mounted shiftably or swingingly, i.e. during sawing, other than merely for adjustment with pivotably mounted head carrying the saw wheels
    • 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
    • Y10T83/04—Processes
    • 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
    • Y10T83/7101—With tool in-feed
    • Y10T83/7114—Including means to permit arcuate in-feed motion
    • 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
    • Y10T83/7101—With tool in-feed
    • Y10T83/7133—By gravity
    • Y10T83/7139—With fluid in-feed regulating 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
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8748—Tool displaceable to inactive position [e.g., for work loading]
    • Y10T83/8749—By pivotal motion

Definitions

  • Frey ABSTRACT Apparatus to control the feeding amount in hydraulically controlled band sawing machines having a pivotable frame which supports the bandsaw, and a hydraulic cylinder for lifting and lowering the frame with respect to the material to be cut, comprising a hydraulic pressure control means for the cylinder, valve means (preferably with a knifeedge shaped outlet) for controlling the quantity of hydraulic fluid reaching the cylinder, and at least one hydraulic connection, namely between the outlet of the control means and the inlet of the valve means.
  • This invention is concerned with an apparatus and a method to control the feeding amount, i.e., the cutting-in speed of band sawing machines.
  • This invention is aimed at solving the above-mentioned problems.
  • the outlet side of the control valve is formed into a knife-edge shape so as to lessen the influence of viscosity variation.
  • the oil volume passing through the quantity control valve is always kept at a level to correspond to the opening of said valve irrespective of the variation of oil temperature, whereby the variation of the cutting-in speed is controlled.
  • a mechanism for controlling and reducing oil pressure is provided between the oil outlet of the cylinder, which controls the lowering of the frame, and the control valve so as to control the descent of the frame at a constant speed and also to reduce its pressure to secure stability of operation of the control valve.
  • FIG. 1 is a side elevation of a horizontal band sawing machine fitted with the control apparatus of the present invention
  • FIG. 2 is a side elevation of the essential parts of FIG. I, on an enlarged scale, and serving as an explanation of the cutting load;
  • FIG. 3 is a sectional view showing the construction of the apparatus according to the invention.
  • FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;
  • FIG. 5 is a schematic detail view explaining the mechanism of the quantity control valve.
  • FIG. 6 illustrates the function of the hydraulic system of the inventive apparatus.
  • FIG. 1 shows a bandsaw blade 7 mounted on a frame 5 which is pivoted at point 1 to a bed or base 3, the frame 5 being provided with a hydraulic cylinder assembly U (schematically shown in FIG. 2 with a simple oil or other hydraulic fluid circuit).
  • a hydraulic cylinder assembly U (schematically shown in FIG. 2 with a simple oil or other hydraulic fluid circuit).
  • FIG. 2 shows the blade 7 cutting a material M, with a simplified cutting-load distribution.
  • P is the reactive force from the hydraulic fluid or oil flowing out of a cylinder 11, forming part of the assembly U, through a mouth or orifice 13, when a piston 9 descends inside the cylinder 11.
  • W is the total weight of the frame 5, G being the center of gravity in the area of the material or workpiece M.
  • letters s illustrate the reactive force from the material M to the saw blade 7.
  • K is the number of teeth in cutting action.
  • the descent of the frame 5 corresponds to the descending speed of the piston 9, i.e., the fluid-flow speed from the orifice 13, which increases if P is raised or increased, and decreases accordingly if P is lowered or decreased.
  • the opening of the quantity control valve i.e., the fluid-flow speed from the orifice 13 is kept constant, and the blade 7 is cutting with a constant feeding amount, and if then the cut length of the material M is increased or decreased, the cutting load is accordingly increased or decreased.
  • P the fluid flowing out of the orifice I3 and the descending speed of the frame 5, i.e., the feeding amount tends to increase or decrease accordingly.
  • the cutting resistance will be respectively increased or decreased, and thus the cutting load will be similarly increased or decreased, acting on P and the fluid-flow speed i.e., to decrease or increase respectively the feeding amount.
  • FIG. 3 the parts generally indicated by letter A constitute a mechanism to control and reduce the oil or hydraulic fluid pressure.
  • a hydraulic case I5 is fixed appropriately to a machine body or base 14.
  • Numeral 17 identifies a working piston slidably mounted in a cylinder 19.
  • Numeral 20 is a spring held between one end of the working piston 17 and the inside bottom of the cylinder 19.
  • the surface of the piston 17 (shown at 21 and 23, respectively, in elevation and in section) slidably contacts the inside of the cylinder 19, and at a recessed portion 25 of the piston 17 an oil passage 27 is provided which connects an oil passage 29 in the hydraulic case 15, which is connected to the oil passage 13, a recessed clearance 31 between the recessed portion 25 and the cylinder 19, and a clearance 33 between the right-hand piston head 23 and the other bottom of the cylinder 19.
  • the oil or hydraulic fluid passage 29 is partly closed by the piston 23, and as shown in the drawing, its opening increases or decreases as the piston 23 moves to the right-hand or the left-hand sides.
  • the mechanism generally indicated in FIGS. 3 and 5 by the letter B is a quantity control mechanism.
  • two quantity control hollow cylinders 37, 39 are fixably mounted with a common axis.
  • the opposite ends of the cylinders 37, 39 are partly in contact, and the rest forms opposite circumferential surfaces 0, c with a clearance e therebetween, the latter clearance being zero at said contact point and gradually increasing to maximum at the position advanced by approximately only to decrease thereafter gradually toward the zero value.
  • a working plunger 47 is rotatably mounted with a close fit to the quantity control cylinders 37, 39, and fixed by an appropriately graduated handle 45 (see FIG. 3; the graduation or dial is not shown).
  • the plunger 47 has an oil passage 49 in its center, with one end open to an oil chamber connected to an oil passage 51 and to the clearance 33.
  • the other end of the oil passage 49 is connected to an opening'53 which is positioned to meet said clearance e.
  • a clearance 55 between knife-edges 41, 43 is connected to an oil tank T (see FIG. 6), on the one hand, and, on the other, to the cylinder 19 where the spring 20 is contained, through an oil passage 57.
  • Parts 59 are fixing pins for the cylinders 37, 39.
  • the opening of the quantity control assembly B is appropriately preset by means of the handle 45.
  • the opening of the oil passage 29 and the action of the spring 20 wiil keep the balance, and the oil or hydraulic fluid flowing out of the cylinder 11 is being pressed by the piston 9 back to the oil tank T through orifice 13, oil passage 29, clearance 31, oil passage 27, clearance 33, oil passages 51 and 49, opening 53, and clearance 55v
  • the cut length of the material M increases, the reactive force P is reduced as explained before and the down stroke of the piston 9 inside the cylinder 11 is slowed down, resulting in less oil flowing through the passages 13, 29 to the clearance 31.
  • the oil pressure in passage 51, behind the pressure controlling and reducing mechanism A, is identified by P, while the outlet pressure, on the other side of the cylinders 37, 39, is denoted P
  • P the outlet pressure
  • the present invention consists, in one of its most important aspects, to control appropriately the descending speed of the frame of the band sawing machine by providing a hydraulic passage or connection, to connect the oil passage 13 which controls the descent of the frame to any quantity control valve, through the pressure controlling and reducing valve A, and by decreasing or increasing, as the case may be, the oil flow into said valve accordingly, as the descending speed of the frame increases or decreases.
  • This procedural arrangement is not anticipated or even suggested by previous devices and arrangements.
  • An oil passage 130 connected to the orifice 13, communicates with conventional pressure or propelling means Pa to supply pressurized hydraulic fluid through a pipe connection 140, having a check valve Va therein, which allows the fluid to flow in one direction, namely from Pa toward the pressure head of cylinder 11.
  • valve Va When one cutting-off operation is completed, the valve Va is opened (means Pa is actuated by any conventional power source such as a motor) and the pressurized fluid is allowed to flow through the pipe 14a, oil passage 13a and then into the pressure head of the cylinder 11, causing upward displacement of the piston 9, which in turn results in the upward pivotal movement of the frame 5, whereby the machine is ready to receive a new material M to be cut.
  • any conventional power source such as a motor
  • An apparatus to control the feeding amount in a hydraulically controlled band sawing machine having a pivotable frame supporting a band saw adapted operatively to engage a stationary material to be cut, and a hydraulic cylinder for selectively lifting and lowering a portion of said frame so as to pivot the same with respect to the material
  • the apparatus comprising, in combination, hydraulic pressure control means for said cylinder, valve means cooperating with said cylinder and controlling the quantity of the adjusted hydraulic fluid flowing through said valve means, the latter having an outlet with a knife-edge shape, a first hydraulic connection between the outlet of said cylinder and the inlet of said pressure control means, and a second hydraulic connection between the outlet of said pressure control means and the inlet of said valve means
  • said pressure control means includes a spring-biased piston with at least one passage therein for the hydraulic fluid, which is narrowed in cross section as the action of said cylinder is accelerated urmn decrease of the cutting resistance and upon increase of the cutting-in speed, and vice versa, thus maintaining the pressure of the hydraulic fluid at a

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
US710839A 1967-06-12 1968-03-06 Apparatus to control the feeding amount in bandsawing machines Expired - Lifetime US3575074A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP42037241A JPS4933997B1 (enrdf_load_stackoverflow) 1967-06-12 1967-06-12

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US3575074A true US3575074A (en) 1971-04-13

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US00107162A Expired - Lifetime US3730033A (en) 1967-06-12 1971-01-18 Method to control the feeding amount in band sawing machines

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JP (1) JPS4933997B1 (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682030A (en) * 1970-11-04 1972-08-08 Gerald R Harris Pivotal arm band saw
US3789717A (en) * 1971-12-01 1974-02-05 Keuro Maschinenbau Gmbh Bandsaw machine
US3862583A (en) * 1972-05-19 1975-01-28 Jiro Tsuchiya Bandsaw machines provided with an improved material holding vise
US3889567A (en) * 1971-07-06 1975-06-17 Amada Co Ltd Horizontal band saw machine
FR2481973A1 (fr) * 1980-05-09 1981-11-13 Keuro Maschinenbau Gmbh Dispositif pour scie mecanique a archet, pour assurer a la lame son approche en profondeur, et fournir la pression de coupe
US4479410A (en) * 1981-09-11 1984-10-30 Amada Company Limited Method and apparatus for controlling the upper limit of a cutting blade in cutting machines
US5043907A (en) * 1990-05-11 1991-08-27 Hem, Inc. Band saw apparatus and method with first cut input to controller
US5352082A (en) * 1990-12-22 1994-10-04 Palamatic Handling Systems Limited Bag slitting machine
US5526727A (en) * 1994-10-28 1996-06-18 Hem, Inc. Bandsaw apparatus with pivotally-mounted saw head assembly arm and method
US20070074615A1 (en) * 2005-09-30 2007-04-05 Kuo-Chuan Lin Sawing machine
CN105171104A (zh) * 2015-09-12 2015-12-23 芜湖汉峰科技有限公司 一种储液器罐体切割装置及其操作方法
US10279405B2 (en) 2017-04-28 2019-05-07 Solar Turbines Incorporated Cutting assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60127917A (ja) * 1983-12-14 1985-07-08 Amada Co Ltd 鋸盤における切削制御方法及び装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1390469A (en) * 1919-09-22 1921-09-13 Metal Saw & Machine Co Inc Operating device for material-working machines
US2601576A (en) * 1949-07-06 1952-06-24 William F Wells Power saw control

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1421107A (en) * 1921-04-23 1922-06-27 Metal Saw And Machine Co Inc Operating device for cutting machines
GB588875A (en) * 1945-03-08 1947-06-05 George H Alexander Machinery L Improvements relating to metal-cutting band saws
CH265586A (de) * 1948-04-10 1949-12-15 Habegger Willy Kaltbandsäge mit in zur horizontalen geneigter Lage arbeitendem Sägeband und hydraulisch gesteuertem Sägebandvorschub.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1390469A (en) * 1919-09-22 1921-09-13 Metal Saw & Machine Co Inc Operating device for material-working machines
US2601576A (en) * 1949-07-06 1952-06-24 William F Wells Power saw control

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682030A (en) * 1970-11-04 1972-08-08 Gerald R Harris Pivotal arm band saw
US3889567A (en) * 1971-07-06 1975-06-17 Amada Co Ltd Horizontal band saw machine
US3789717A (en) * 1971-12-01 1974-02-05 Keuro Maschinenbau Gmbh Bandsaw machine
US3862583A (en) * 1972-05-19 1975-01-28 Jiro Tsuchiya Bandsaw machines provided with an improved material holding vise
FR2481973A1 (fr) * 1980-05-09 1981-11-13 Keuro Maschinenbau Gmbh Dispositif pour scie mecanique a archet, pour assurer a la lame son approche en profondeur, et fournir la pression de coupe
US4359921A (en) * 1980-05-09 1982-11-23 Keuro Maschinenbau Gmbh & Co. Kg Double-acting cylinder-piston unit for a mechanical frame saw
US4479410A (en) * 1981-09-11 1984-10-30 Amada Company Limited Method and apparatus for controlling the upper limit of a cutting blade in cutting machines
US5043907A (en) * 1990-05-11 1991-08-27 Hem, Inc. Band saw apparatus and method with first cut input to controller
US5352082A (en) * 1990-12-22 1994-10-04 Palamatic Handling Systems Limited Bag slitting machine
US5526727A (en) * 1994-10-28 1996-06-18 Hem, Inc. Bandsaw apparatus with pivotally-mounted saw head assembly arm and method
US5787774A (en) * 1994-10-28 1998-08-04 Hem, Inc. Bandsaw apparatus with pivotally-mounted saw head assembly arm and method
US20070074615A1 (en) * 2005-09-30 2007-04-05 Kuo-Chuan Lin Sawing machine
US7261027B2 (en) * 2005-09-30 2007-08-28 Kuo-Chuan Lin Sawing machine
CN105171104A (zh) * 2015-09-12 2015-12-23 芜湖汉峰科技有限公司 一种储液器罐体切割装置及其操作方法
US10279405B2 (en) 2017-04-28 2019-05-07 Solar Turbines Incorporated Cutting assembly

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Publication number Publication date
US3730033A (en) 1973-05-01
JPS4933997B1 (enrdf_load_stackoverflow) 1974-09-11

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