US2539027A - Vibrating tracer stylus - Google Patents

Vibrating tracer stylus Download PDF

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Publication number
US2539027A
US2539027A US125204A US12520449A US2539027A US 2539027 A US2539027 A US 2539027A US 125204 A US125204 A US 125204A US 12520449 A US12520449 A US 12520449A US 2539027 A US2539027 A US 2539027A
Authority
US
United States
Prior art keywords
stylus
vibrating
race
pattern
tracer
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
US125204A
Other languages
English (en)
Inventor
Marchant Lawrence Edgar
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.)
AV Roe Canada Ltd
Original Assignee
AV Roe Canada 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 AV Roe Canada Ltd filed Critical AV Roe Canada Ltd
Priority to US125204A priority Critical patent/US2539027A/en
Priority to CH295465D priority patent/CH295465A/fr
Priority to GB25760/50A priority patent/GB671525A/en
Priority to DEC3359A priority patent/DE876523C/de
Application granted granted Critical
Publication of US2539027A publication Critical patent/US2539027A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/002—Details
    • 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
    • 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

Definitions

  • This invention relates generally to tracing styli for duplicating machines, and more particularly to means for rapidly vibrating a stylus in order to reduce the effects of friction between the stylus and a pattern over which it moves.
  • a movable work table mounted on a frame supports a pattern of the contour to be reproduced and a blank in which the contour is to be reproduced.
  • Adjacent to the model is mounted a tracing stylus or follower, and adjacent to the blank is mounted a power-driven cutting head.
  • the stylus and cutting head are fixed relatively to each other, or are arranged so that the movement of the cutting head will be proportional to the movement of the stylus.
  • the work table is provided with driving means that move the table in its own plane in two directions at right angles to each other, the work table being usually reciprocated in one direction and indexed or moved by small increments in the other direction.
  • vibrations induced in a stylus enable it to move more freely over the pattern contour, thus enabling the cutting head a to reproduce in the blank more faithful copies of the pattern contour. It has also been found that the vibrations induced in the stylus should preferably be rapid but of comparatively small amplitude.
  • a further object of the invention is to prov de a stylus vibrating device which may conveniently be a plied to conventional du licating machines.
  • Fig. 1 is a broken away perspective view of a tracer stylus embodying the invention.
  • Fig. 2 is a perspective view of a tracer stylus embodying an alternative form ofv the invention.
  • an ordinary stylus holder 3 is provided with a collet type locking nut 4 which clamps the shank of a stylus 5, the free end 5a of the stylus being adapted to beavagainst a pattern 6.
  • a collar I Suitably secured to the stylus immediately below the locking nut is a collar I having an upper internal flange la and a lower internal flange lb which define an annular chamber 8.
  • An inlet pipe 9 which extends through the collar into the chamber 8 is adapted to be connected by a length of flexible tubing ID to a supply of fluid under pressure, preferably compressed air.
  • the internal periphery of the upper flange 1a of the collar makes a substantially air-tight joint with the stylus 5 whereas there is provided in the internal periphery of the lower flange lb of the collar a helical groove 10 which is essentially a coarse thread. The crests of the thread engage the stylus, the thread grooves thus forming a helical conduit connecting the chamber 8 to the space below the lower flange 11).
  • cup-like member II Concentrically mounted below the collar 1 and spaced therefrom is a cup-like member II which provides a race I2 in which a small steel ball I3 is free to roll in a circular path around the stylus 5.
  • the diameter of the ball should be substantially greater than the space or gap between the collar I and the cup-like member I I.
  • the rotation of the ball [3 around the stylus 5 produces an unbalance in the stylus of a frequency proportional to the speed of rotation of the ball around the stylus and an amplitude proportional to the weight of the ball and to the diameter of the race.
  • the vibrations thereby induced in the stylus cause variations in the pressure of the stylus against the pattern 6, which variations in pressure tend to relieve the frictional drag of the stylus against the pattern, and prevent the stylus from sticking and advancing with a jerky motion.
  • a small elementary turbine rotor hi is rotatably mounted on a stylus I5 shown bearing against a pattern it, by means of a ball bearing member I], the inner race of which is pressed onto the stylus.
  • the turbine wheel is deliberately unbalanced by removing a small amount of metal at one point or by other means well known in the art.
  • the frequency of the vibrations may be varied at will by providing a suitable throttle in the compressed air supply; in order to avoid resonant effects it is desirable to avoid vibrating the tracer stylus at any frequency which is a multiple of the frequency at which the cutter teeth engage the blank.
  • the amplitude of the vibrations may be varied by changing the radius of rotation of the rotating unbalanced mass or by changing the magnitude of the unbalance.
  • means for vibrating the stylus comprising a mass rotatably mounted on the stylus and unbalanced about its centre of rotation, and means for rotating said mass.
  • means for vibrating the stylus comprising a mass rotatably mounted on the stylus and unbalanced about its centre of rotation, and means for rotating the mass including a nozzle arranged to direct a flow of fluid which impinges on the rotatable mass eccentrically of its centre of rotation.
  • means for vibrating the stylus 4 comprising an endless race mounted on the stylus, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a nozzle arranged to direct a flow of fluid on the rollable body.
  • means for vibrating the stylus comprising an annular race mounted on the stylus and having the stylus as its centre, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a collar mounted on the stylus adjacent the race, a conduit in the collar having one end connected to a supply of fluid under pressure and its other end being open and directed in the race to eject a flow of fluid which impinges on the rollable body.
  • means for vibrating the stylus comprising an annular race mounted on the stylus and having the stylus as its centre, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a collar mounted on the stylus adjacent the race, a chamber in the collar and connected to a supply of fluid under pressure, a helical conduit in the collar coiled around the stylus and having one end connected to the chamber and its other end opening into the race for directing a flow of fluid into the race to roll the rollable .body in the race around the stylus.
  • Atracer having a stylus adapted to bear against a pattern, means for vibrating the stylus com-prisingan unbalanced wheel. mounted on the stylus and means for rotating the wheel about the stylus.
  • means for vibrating the stylus comprising a turbine wheel rotatably mounted on the stylus which provides its axis of rotation, and a nozzle arranged to direct a flow of fluid. on the wheel to rotate it about the stylus.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Testing Of Balance (AREA)
  • Jigs For Machine Tools (AREA)
US125204A 1949-11-03 1949-11-03 Vibrating tracer stylus Expired - Lifetime US2539027A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US125204A US2539027A (en) 1949-11-03 1949-11-03 Vibrating tracer stylus
CH295465D CH295465A (fr) 1949-11-03 1950-10-17 Dispositif pour imprimer des vibrations à un organe palpeur d'une machine à reproduire.
GB25760/50A GB671525A (en) 1949-11-03 1950-10-23 Vibrating tracer stylus for copy-milling and like machines
DEC3359A DE876523C (de) 1949-11-03 1950-10-31 Vibrierender Fuehlstift

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US125204A US2539027A (en) 1949-11-03 1949-11-03 Vibrating tracer stylus

Publications (1)

Publication Number Publication Date
US2539027A true US2539027A (en) 1951-01-23

Family

ID=22418643

Family Applications (1)

Application Number Title Priority Date Filing Date
US125204A Expired - Lifetime US2539027A (en) 1949-11-03 1949-11-03 Vibrating tracer stylus

Country Status (4)

Country Link
US (1) US2539027A (fr)
CH (1) CH295465A (fr)
DE (1) DE876523C (fr)
GB (1) GB671525A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2753764A (en) * 1950-11-23 1956-07-10 Power Jets Res & Dev Ltd Profile copying machines
US2821023A (en) * 1953-10-02 1958-01-28 Barden Corp Curvature gauge
US3319340A (en) * 1964-11-27 1967-05-16 Pipe Machinery Company Profile indicator and recorder
US3777616A (en) * 1971-12-22 1973-12-11 J Mueller Controlled cutting
US3824893A (en) * 1971-07-07 1974-07-23 Dea Spa Tridimensional universal tracer, slidable on air bearings, for continuous, high-speed copying of profiles of models
US4842454A (en) * 1986-04-23 1989-06-27 Gustavsson Axel G V Method and an arrangement for the preparation of insert bodies for the artificial rebuilding of teeth and human limbs, etc.
US5383752A (en) * 1991-11-17 1995-01-24 Liconic Ag Apparatus for making dental replacements

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2753764A (en) * 1950-11-23 1956-07-10 Power Jets Res & Dev Ltd Profile copying machines
US2821023A (en) * 1953-10-02 1958-01-28 Barden Corp Curvature gauge
US3319340A (en) * 1964-11-27 1967-05-16 Pipe Machinery Company Profile indicator and recorder
US3824893A (en) * 1971-07-07 1974-07-23 Dea Spa Tridimensional universal tracer, slidable on air bearings, for continuous, high-speed copying of profiles of models
US3777616A (en) * 1971-12-22 1973-12-11 J Mueller Controlled cutting
US4842454A (en) * 1986-04-23 1989-06-27 Gustavsson Axel G V Method and an arrangement for the preparation of insert bodies for the artificial rebuilding of teeth and human limbs, etc.
US5383752A (en) * 1991-11-17 1995-01-24 Liconic Ag Apparatus for making dental replacements

Also Published As

Publication number Publication date
DE876523C (de) 1953-05-15
GB671525A (en) 1952-05-07
CH295465A (fr) 1953-12-31

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