US3683744A - Device for compensating the head weight on portal or cantilever type machine tools - Google Patents

Device for compensating the head weight on portal or cantilever type machine tools Download PDF

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Publication number
US3683744A
US3683744A US110040A US3683744DA US3683744A US 3683744 A US3683744 A US 3683744A US 110040 A US110040 A US 110040A US 3683744D A US3683744D A US 3683744DA US 3683744 A US3683744 A US 3683744A
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US
United States
Prior art keywords
cable
head
carriage
winch
motor
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
US110040A
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English (en)
Inventor
Gunter Briesofsky
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.)
WERKZEUG MAS FAB ADOLF WALDRIC
Original Assignee
WERKZEUG MAS FAB ADOLF WALDRIC
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.)
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Publication date
Application filed by WERKZEUG MAS FAB ADOLF WALDRIC filed Critical WERKZEUG MAS FAB ADOLF WALDRIC
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Publication of US3683744A publication Critical patent/US3683744A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/001—Arrangements compensating weight or flexion on parts of the machine
    • B23Q11/0017—Arrangements compensating weight or flexion on parts of the machine compensating the weight of vertically moving elements, e.g. by balancing liftable machine parts
    • B23Q11/0021—Arrangements compensating weight or flexion on parts of the machine compensating the weight of vertically moving elements, e.g. by balancing liftable machine parts the elements being rotating or pivoting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C1/00—Milling machines not designed for particular work or special operations
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/91—Machine frame
    • Y10T408/92—Machine frame with counterweight mechanism
    • 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
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/309576—Machine frame
    • Y10T409/309688—Machine frame including counterbalancing means

Definitions

  • ABSTRACT A device for counterbalancing a head slidably mounted on a crossrail in which a cable is secured at one end to the head and the other end of which cable is secured to a cable winch exerting a constant pull on the cable and the head, the winch is resiliently, slidably mounted in the direction of cable pull on a carriage which carriage travels parallel to the direction of travel of the head on the cross rail, means including a feeler sensing the sliding movement of the winch in the cable pull direction is provided for controlling the direction of rotation of the cable winch so as to maintain the winch in a predetermined position of rest, means is also provided for maintaining the carriage travel in alinement with the head travel.
  • the invention relates to a device for compensating the head weight on portal or cantilever type machine to its position of rest in which the motor exerts a contools, in which the head is suspended on a cable leading to a carriage slidable above the cross rail on a stationary cross beam, for example the cross head, parallel with the cross rail, which carriage is driven in synchronism with the head, the cable being under constant pull.
  • the cross rail of a machine tool is deflected by different amounts depending on the position of the head. It is therefore necessary to compensate the weight of the heads by vertically upward pull.
  • the cable is passed over stationary rollers and over movable rollers situated on the carriage, and counterweights are provided on the end of the cable.
  • the cable cannot run in one plane, so that many guide rollers are necessary. If there are two or more heads, this results in considerable accommodation difficulties, particularly if it is considered that in the case of heads of considerable weight, the counterweights must be of large and heavy construction.
  • the invention is based on the problem of providing a device of the type mentioned in the foregoing which permits the most accurate compensation possible of the head weight and at the same time is of the most spacesaving construction possible.
  • a cable winch resiliently supported in the pulling direction of the cable, is provided on the carriage, which winch is driven by a motor continuously exerting a constant torque on the winch drum, a feeler, movable in the direction of pull of the cable and connected to a regulator controlling the power supply to the motor, being provided between the cable winch and carriage for controlling the motor, such that on a change in position of the cable winch owing to variation in the cable load, the power supply to the motor is released in one or the other direction of rotation until the cable winch has returned to its position of rest.
  • This arrangement eliminates any counterweights.
  • the entire device can be accommodated on a comparatively small carriage so that also the compensation of a number of heads does not give rise to any difficulties, since a number of carriages may be arranged side by side.
  • the feeler with the regulator and motor together form a regulating circuit which ensures that the cable winch is alwaysretumed stant torque on the cable winch and hence a constant pull on the cable.
  • a particularly advantageous embodiment of the subject of the invention is that an auxiliary girder mounted freely at both ends on the uprights and independent of the cross-head is provided as cross-girder for the carriage, only the front carriage guide rail situated nearer to the head being preferably mounted on the auxiliary girder, while the more remotely situated guide rail is fixed to the cross head.
  • the auxiliary girder then receives the principal supporting load. This obviates the transmission of bending forces to the uprights, which could affect the accuracy of the machine tool. Any deflections of the auxiliary girder in the device according to the invention are without effect on the compensation of the weight of the head. Independently of the length of the pull cable at the time, the device according to the invention ensuresthat the same pull is always exerted on the cable.
  • FIG. 1 shows a diagrammatic perspective view of the subject of the invention
  • FIG. 2 shows a side view in the direction II of FIG. 1,
  • FIG. 3 shows apart plan in the direction III of FIG. 2.
  • 1 denotes a head slidable on the cross rail 2.
  • a cable 3 is fixed to the head 1 in the axis of its center of gravity.
  • the cable is passed over a guide roller 4 to the cable drum 6 of a cable winch 5, which advantageously is driven by a hydraulic motor 7, possibly with the interposition of a suitable reduction gear 7a.
  • the cable winch 5 is mounted on a slide 12 slidable horizontally on the carriage 8 in the direction of the cable pull.
  • the slide is supported on the carriage 8 by compression springs 9.
  • the carriage itself is slidably guided, parallel to the cross rail by means of the rail 11, mounted on the auxiliary girder 13, and the rail 14 secured to the cross head 22.
  • the carriage is driven by a hydraulic motor 17 which engages the rack 15 by means of the pinion 16.
  • the power supply to this hydraulic motor is controlled by means of a regulator 18 which co-operates with a feeler 20 exploring the deflection of the cable 3, as is described more particularly below.
  • the cable 3 To bring about compensation of the head weight, it is necessary for the cable 3 to be under a constant pull.
  • the hydraulic motor 7 is under constant pressure and exerts a constant torque on the cable drum 6.
  • a regulator 10 which controls the power supply to the motor 7 and is connected to a feeler 10a.
  • the feeler 10a is movable in the direction of pull of the cable and explores a part of the carriage 8.
  • the cable winch 5 is at first moved to the left in the direction A, the springs 9 being compressed. This movement is detected by the feeler 10a and hydraulic fluid is supplied to the hydraulic motor 7 by the regulator 10, whereby the cable winch 6 is rotated in the direction B. The pull cable 3 is thereby lengthened until the pull on the cable has reached its original value again, and the springs 9 force the cable winch 5 to the right into its position of rest. If, on the contrary, the cross rail 2 moves upward, the springs 9 force the cable winch 5 to the right. The feeler 10a then adjusts the regulator 10 such that the motor 7 is actuated in the reverse direction of rotation and thus the cable drum is driven opposite to the direction of the arrow B.
  • a hydraulic motor is advantageously used for driving the cable drum 6 since it can be regulated particularly simply and in its position of rest develops the torque necessary for weight compensation.
  • a suitable electric motor which develops a holding torque when stationary, could possibly also be provided.
  • the regulating circuit of the motor is advantageously adjusted such that the constant pull exerted by the cable winch is greater than the weight of the head.
  • the head is thereby pressed from below in the cutting force direction against the guides of the cross rail, thereby ensuring that the head always bears against the same guideway, independently of which cutting force occurs.
  • This auxiliary girder may either carry the entire carriage or preferably may be constructed such that only the front guide rail 11 of the carriage 8, situated closer to the head, is mounted on the said auxiliary girder, while the more remotely situated guide rail 14 is fixed to the cross head 22.
  • the auxiliary girder 13 then receives the principal supporting load. Owing to this auxiliary girder, bending stresses are then no longer transmitted to the uprights.
  • the inevitable deflection of the auxiliary girder under the load of the head and carriage has no effect on the magnitude of the pull exerted on the cable, since this pull is always kept constant by the device described in the foregoing. Deflection of the auxiliary girder would of course be equivalent to an upward movement of the cross rail.
  • a feeler is provided on the carriage or its arm 19, and bears against the cable length extending vertically downward to the head, which feeler is movable in the direction of movement of the carriage and is connected to the regulator 18.
  • Vertical position of the cable explored by the feeler 20 corresponds to zero position of the regulator 18, in which the supply to the hydraulic motor 17 is blocked. If the head 1 moves, a deflection of the feeler 20 occurs through the self-adjusted inclination of the cable, and the regulator releases power to the hydraulic motor 17 in the necessary direction until the vertical position of the cable has again been reached.
  • the present invention is not restricted to the embodiment example shown.
  • a head having a slide vertically slidable in the elevating screw direction known as a slide milling head
  • the result is a permanent weight compensation of the slide carrying the screw regardless of whether the cross rail or only the slide is moved up or down.
  • a cable winch (5) resiliently supported in the pulling direction of the cable (3), is provided on the carriage (8), and is driven by a motor (7) continuously exerting a constant torque on the cable drum (6), a feeler (10a) movable in the cable pull direction and connected to a regulator (10) controlling the power supply to the motor (7) being provided between the cable winch (5) and carriage (8) for controlling the motor (7), such that on a change in position of the cable winch (5) owing to a change in the cable load, the power supply to the motor (7 is released in the one or other direction of rotation until the cable winch (5) has returned to its position of rest.
  • Device according to claim 1 characterized in that a hydraulic motor is provided as cable winch motor 7 4.
  • Device characterized in that a feeler (20), bearing against the cable length (3) extending vertically on the carriage (8), is movable in the direction of movement of the carriage (8) and is connected to a regulator (18) controlling the power supply to the driving motor (17) of the carriage (8) such that on lateral deflection of the cable (3) due to sliding of the head (1), power supply is released to the driving motor (17) until the deflection is removed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Machine Tool Units (AREA)
US110040A 1970-02-06 1971-01-27 Device for compensating the head weight on portal or cantilever type machine tools Expired - Lifetime US3683744A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2005554A DE2005554C3 (de) 1970-02-06 1970-02-06 Vorrichtung zur Kompensation des Supportgewichtes an Portal- oder Auslegerwerkzeugmaschinen

Publications (1)

Publication Number Publication Date
US3683744A true US3683744A (en) 1972-08-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US110040A Expired - Lifetime US3683744A (en) 1970-02-06 1971-01-27 Device for compensating the head weight on portal or cantilever type machine tools

Country Status (3)

Country Link
US (1) US3683744A (de)
DE (1) DE2005554C3 (de)
GB (1) GB1338103A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7665200B1 (en) 2009-02-27 2010-02-23 Mike Seiji Shimooka Multiple purpose CNC machine
CN102398190A (zh) * 2011-10-12 2012-04-04 沈机集团昆明机床股份有限公司 大型数控落地铣镗床滑枕挠度补偿装置
US20130025896A1 (en) * 2010-03-02 2013-01-31 Cinetic Landis Limited Counterforce Mechanism And Methods Of Operation Thereof
US20150352678A1 (en) * 2013-02-07 2015-12-10 Innse-Berardi S.P.A. Machine tool with a device for acting against the weight of a machining head
EP3009225A1 (de) * 2014-10-17 2016-04-20 Bostek Innovation S.L.U. Portalwerkzeugmaschine mit großem horizontalem Querträger mit horizontaler Ausgleichsvorrichtung
RU2830680C1 (ru) * 2024-03-13 2024-11-25 Общество с ограниченной ответственностью "Завод трубопроводной арматуры" Портальный манипулятор

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1163536B (it) * 1983-06-17 1987-04-08 Innocenti Santeustacchio Spa Dispositivo per il bilanciamento del peso di una testa verticalmente mobile di una macchina utensile
EP3009228A1 (de) * 2014-10-17 2016-04-20 Bostek Innovation S.L.U. Werkzeugmaschine mit verschiebbarem Ausgleichssystem auf einem Wagen außerhalb der Maschine
IT201900006561A1 (it) * 2019-05-06 2020-11-06 Tecnos Srl Macchina utensile a traversa mobile con compensazione della deformazione torsionale e della deformazione flessionale della traversa

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE507872A (de) * 1950-12-15
US2464415A (en) * 1943-10-18 1949-03-15 G Sa Ab Machine tool and more particularly to marking machine with a center

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464415A (en) * 1943-10-18 1949-03-15 G Sa Ab Machine tool and more particularly to marking machine with a center
BE507872A (de) * 1950-12-15

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7665200B1 (en) 2009-02-27 2010-02-23 Mike Seiji Shimooka Multiple purpose CNC machine
US20130025896A1 (en) * 2010-03-02 2013-01-31 Cinetic Landis Limited Counterforce Mechanism And Methods Of Operation Thereof
US9789578B2 (en) * 2010-03-02 2017-10-17 Fives Landis Limited Counterforce mechanism and methods of operation thereof
CN102398190A (zh) * 2011-10-12 2012-04-04 沈机集团昆明机床股份有限公司 大型数控落地铣镗床滑枕挠度补偿装置
CN102398190B (zh) * 2011-10-12 2013-10-16 沈机集团昆明机床股份有限公司 大型数控落地铣镗床滑枕挠度补偿装置
US20150352678A1 (en) * 2013-02-07 2015-12-10 Innse-Berardi S.P.A. Machine tool with a device for acting against the weight of a machining head
US10730157B2 (en) * 2013-02-07 2020-08-04 Innse-Berardi S.P.A. Machine tool with a device for acting against the weight of a machining head
EP3009225A1 (de) * 2014-10-17 2016-04-20 Bostek Innovation S.L.U. Portalwerkzeugmaschine mit großem horizontalem Querträger mit horizontaler Ausgleichsvorrichtung
RU2830680C1 (ru) * 2024-03-13 2024-11-25 Общество с ограниченной ответственностью "Завод трубопроводной арматуры" Портальный манипулятор

Also Published As

Publication number Publication date
DE2005554A1 (de) 1971-08-12
GB1338103A (en) 1973-11-21
DE2005554B2 (de) 1973-03-08
DE2005554C3 (de) 1973-09-27

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