US3617024A - Copy milling device - Google Patents

Copy milling device Download PDF

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Publication number
US3617024A
US3617024A US809083A US3617024DA US3617024A US 3617024 A US3617024 A US 3617024A US 809083 A US809083 A US 809083A US 3617024D A US3617024D A US 3617024DA US 3617024 A US3617024 A US 3617024A
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US
United States
Prior art keywords
feeler
movement
carrying head
arm
arm means
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
US809083A
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English (en)
Inventor
Patrick William Agnew
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.)
PRECISION HYDRAULICS Ltd
Original Assignee
PRECISION HYDRAULICS Ltd
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 PRECISION HYDRAULICS Ltd filed Critical PRECISION HYDRAULICS Ltd
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Publication of US3617024A publication Critical patent/US3617024A/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
    • B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
    • B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
    • B23Q35/24—Feelers; Feeler units
    • B23Q35/26—Feelers; Feeler units designed for a physical contact with a pattern or a model
    • B23Q35/36—Feelers; Feeler units designed for a physical contact with a pattern or a model for control of a hydraulic or pneumatic copying system
    • 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
    • Y10T409/303416—Templet, tracer, or cutter
    • Y10T409/303472—Tracer
    • Y10T409/30364—Adapted to trigger fluid energy

Definitions

  • SHEET 30F 3 lnuenlor pAT WILLIAM Acmew Ynwm naunzucu ltorneys COPY MILLING DEVICE This invention relates to apparatus for use in following or tracing the contour of a shaped member.
  • Normally apparatus for tracing the contour of a shaped member includes a platform adapted to mount a shaped member and a feeler mounted on a carrying head and adapted to engage the shaped member, means tending to maintain the feeler in engagement with the shaped member, and servomotor devices coupled to the platform for movement of the platform respectively in directions at right angles to each other to trace the contour of said shaped-member, the velocity of said devices being controlled by velocity control means, for example, valves or other movement-sensing means actuated by the aforesaid movement of said feeler, such apparatus being referred to hereinafter as apparatus of the type aforesaid.
  • apparatus of the type aforesaid including a feeler, a first and a second arm, the feeler being rigidly mounted on said first arm which, in turn is pivotally mounted intennediate its ends on the second arm for movement about an axis parallel to the longitudinal axis of the feeler, the second arm being pivotally mounted on the carrying head for movement about a second axis parallel to and spaced from the first axis, the end of the first arm remote from the feeler actuating the velocity control.
  • FIG. 1 shows a feeler-mounting arrangement
  • FIG. 2 shows an automatically controlled tracing apparatus
  • FIG. 3 shows a manually controlled tracing apparatus.
  • FIGS. 2 and 3 show a vertical feeler 1 rigidly mounted on two spaced horizontal parallel first arms 2 and 3, the arms in turn being mounted for pivotal movement about an axis BB FIG. 1 on a second arm 4 by means of ball bearings 9 which are adjustable to take up backlash.
  • This second arm 4 takes the form of a stirrup and its end remote from the first arm is pivotally mounted about an axis AA (FIG. 1) on the carrying head of the apparatus again by adjustable ball bearings (not shown).
  • the end of the upper horizontal arm 3 is provided with an extension 5 having a cylindrical bore 6 which embraces the part-spherical outer surface 7 ofthe valve member 8 of a disc valve FIGS. 2 and 3.
  • the axes AA and 88 about which the first and second arms pivot are mutually parallel to the longitudinal axis of the feeler l and thus the feeler is constrained to point always in a vertical direction, however, any movement of the feeler 1 in a horizontal direction causes a corresponding movement of the valve member 8.
  • the maximum displacement of the feeler tip is in the order of 0.01 inch and since the effective length of the arms is in the order of 1 inch the displacement of the valve member 8 from its center position is equal to that of the feeler; the displacements along the axis of the first arms 2, 3 being in the same sense as those of the feeler and the displacements at right angles to the axis of arms 2 and 3 being in the opposite sense.
  • the valve member 8 is disc shaped and has two concentric raised rims 10,11 on either side, the inner raised rims l1 defining two cylindrical recesses 12 and 13 while between the inner and outer raised rims annular recesses 14 and 15 are defined.
  • the cylindrical recesses 12 and 13 on opposite sides of the member are joined by a bore 16 of frustoconical shape.
  • the valve member 8 is accommodated in a valve chamber formed in the carrying head 17 and has a sliding fit within this chamber.
  • Two first valve ports 18, (only one of which is shown in H68.
  • each of these ports 18 is in fluid communication with a hydraulic piston and cylinder device (not shown) the purpose of which will be described below.
  • a further port 19 is provided in the bottom face of the valve chamber, this port providing for fluid communication between the annular recess 15 and a fluid reservoir.
  • the carrying head 17 below the valve member 8 is provided with a central bore 20 in which is accommodated a valve-centralizing rod 21, this rod being provided at its upper end with a conical surface 22 corresponding to the frustoconical bore 16 in the member.
  • the rod 21 is capable of axial movement into and out of the valve chamber 8 and feed rate adjusting means, part of which are shown at 23, are provided to hold the rod in its adjusted position. With the rod 21 in its fully raised position the conical surfaces 16,22 of the member and rod abut and movement of the member 8 is prevented, while on lowering the rod, a limited amount of movement of the member is permitted.
  • the rod 21 is provided with a through bore 24 and this bore is in fluid communication with the high-pressure side of the pump which takes its fluid from the aforesaid reservoir.
  • pressure fluid is supplied to the cylindrical recesses l2, 13 in the valve chamber and, dependent on the displacement of the valve member, to the piston and cylinder devices.
  • exhaust of fluid from the piston and cylinder devices through the first ports 18 to the annular recess 15 and thence to the reservoir by way of ports 19 is possible.
  • second ports 18 are provided in the upper face of the chamber, two second ports being provided spaced l apart and closable by the inner raised rim 11 on the top of the valve member 8 when the valve member is in its central position.
  • the piston and cylinder devices are arranged at right angles to each other and move a table on which a shaped member is rigidly mounted.
  • the feeler abuts the periphery of this shaped member and thus movement of the table causes displacement of the feeler l and corresponding movement of the valve member 8, this controlling the supply and exhaust of fluid to and from the devices and causing the devices to move the table in such a manner that the profile of the shaped member or template is traced.
  • This mode of operation is described in US. Pat. No. 3,399,600.
  • Spring means are provided to maintain the feeler 1 in contact with the shaped member and these means include a sleeve 30 rotatably mounted on the carrying head 17 and a bellcrank 31 pivotally mounted at the lower end of the sleeve 30.
  • the bellcrank 31 carries a roller 32 at the end of one of its arms 33, which roller 32 abuts the feeler 1 and the end of its other arm 34 is attached to a tension spring 35 which is mounted within the sleeve 30.
  • An adjustable spring anchorage 36 is provided at the other end of the sleeve and thus the bellcrank roller 32 is, at all times, urged into contact with the feeler 1. It is desirable to maintain the force exerted on the feeler l at all times at the same angle to the profile of the template and in this respect means are provided to rotate the sleeve 30 and thus the bellcrank 31.
  • Said means include a radial piston motor accommodated in the carrying head 17, this motor comprising a shaft 40 rotatably mounted with its axis concentric with the axis of the valve member 8 in its undisplaced position.
  • the cam or eccentric of the motor takes the form of a cam surface 41 which is at all times parallel to the axis of the shaft 40 but varies progressively in radius.
  • At least three pistons in the form of balls 42 act on this surface 41 and the balls are accommodated in cylinders 43, the axes of which are perpendicular to the shaft axis, the periphery of each ball 42 abuts the cammed surface and movements of the balls are obtained by supplying pressure fluid from the valve chamber by way of the second ports 18 to that part of the cylinder on the side of the balls 42 remote from the shaft 40, an increase of pressure fluid to this side of the balls causing inward movement of the balls which, in turn, causes rotation of the shaft.
  • Exhaust of fluid from the cylinder 43 is by way of a bore 44 leading to the annular recess 14 in the valve chamber.
  • the upper end of the shaft 40 carries a gear wheel 45 of similar diameter a further gear wheel 46 fixed to the top of the sleeve 30.
  • a gear wheel 45 of similar diameter a further gear wheel 46 fixed to the top of the sleeve 30.
  • the reverse gear train has a ratio of 1:1 since the arms 2,3,4, connecting the feeler 1 to the valve member 8 cause the member to describe a small circle anticlockwise if the feeler describes a similar small clockwise circle. Consequently, the direction of spring loading on the feeler must rotate in the opposite direction to the motor.
  • the gear 45 mounted on the motor shaft 40 may be declutched from the shaft to allow for manual manipulation of the tracing head for setting up or other purposes.
  • Apparatus of the type aforesaid including a feeler, a first and a second arm means, the feeler being rigidly mounted on said first arm means which, in turn, is pivotally mounted intermediate its ends on the second arm means for movement about an axis parallel to the longitudinal axis of the feeler, the second ann means being pivotally mounted on a carrying head for movement about a second axis parallel to and spaced from the first axis, the end of the first arm means remote from the feeler actuating a velocity control means.
  • the first arm means includes two parallel-spaced members each pivoted intermediate its ends on the second arm means and each rigidly fixed to the feeler, one member carrying the velocity control actuating means.
  • the velocity control means comprises valve means including a chamber defined in the carrying head and having parallel-facing faces, and a member slidably mounted between said faces, said member being movable by the feeler and having corresponding concentric cylindrical and annular recesses in its opposite faces and a central through passage, pressure fluid ports in communication with said cylindrical and annular recesses at all positions of the member and ports in the facing faces separately closable by said member and adapted to be placed in fluid communication with piston and cylinder devices.
  • the carrying head includes also a radial piston motor operable by fluid led from additional ports in communication with the chamber of the valve means, the output shaft of said motor engaging by way of a gear train a rotatable part of the carrying head.
  • Apparatus as claimed in claim 1 including means tending to maintain the feeler in engagement with a shaped member, which includes a bellcrank having a roller abutting the feeler, the bellcrank being pivotally mounted on the carrying head and spring urged towards the feeler.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US809083A 1968-03-21 1969-03-21 Copy milling device Expired - Lifetime US3617024A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1368968 1968-03-21

Publications (1)

Publication Number Publication Date
US3617024A true US3617024A (en) 1971-11-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US809083A Expired - Lifetime US3617024A (en) 1968-03-21 1969-03-21 Copy milling device

Country Status (3)

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US (1) US3617024A (forum.php)
DE (1) DE1914107A1 (forum.php)
GB (1) GB1256504A (forum.php)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557876A (en) * 1945-09-25 1951-06-19 Gorton George Machine Co Adjustable compensating tracer style unit
US2911182A (en) * 1956-03-16 1959-11-03 Prec Grinding Ltd Pattern-controlled machine tools
US3174403A (en) * 1959-10-26 1965-03-23 Young Spring & Wire Corp Hydraulic servo control mechanism
US3399600A (en) * 1965-04-24 1968-09-03 Prec Hydraulics Ltd Apparatus for tracing the contour of a shaped member

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557876A (en) * 1945-09-25 1951-06-19 Gorton George Machine Co Adjustable compensating tracer style unit
US2911182A (en) * 1956-03-16 1959-11-03 Prec Grinding Ltd Pattern-controlled machine tools
US3174403A (en) * 1959-10-26 1965-03-23 Young Spring & Wire Corp Hydraulic servo control mechanism
US3399600A (en) * 1965-04-24 1968-09-03 Prec Hydraulics Ltd Apparatus for tracing the contour of a shaped member

Also Published As

Publication number Publication date
DE1914107A1 (de) 1970-06-04
GB1256504A (forum.php) 1971-12-08

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